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Events in JavaScript
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/events-in-javascript.html What is an event An event is a signal from the browser that something has happened. For example, 1. When a user clicks on an HTML element, click event occurs 2. When a user moves the mouse over an HTML element, mouseover event occurs When events occur, we can execute JavaScript code or functions in response to those events. To do this we need to associate JavaScript code or functions to the events. The function that executes in response to an event is called event handler. In JavaScript, there are several ways to associate an event handler to the event 1. Using the attributes of an HTML tag 2. Using DOM object property 3. Using special methods In this video we will discuss associating event handler methods to events using the attributes of HTML tags. In the following example, the code to execute in response to onmouseover & onmouseout events is set directly in the HTML markup. The keyword "this" references the current element. In this example "this" references the button control. [input type="button" value="Click me" id="btn" onmouseover="this.style.background= 'red'; this.style.color = 'yellow'" onmouseout="this.style.background= 'black'; this.style.color = 'white'" /] The above example, can be rewritten as shown below. In this case the code to execute in response to the event is placed inside a function and then the function is associated with the event. [input type="button" value="Click me" id="btn" onmouseover="changeColorOnMouseOver()" onmouseout="changeColorOnMouseOut()" /] [script type="text/javascript"] function changeColorOnMouseOver() { var control = document.getElementById("btn"); control.style.background = 'red'; control.style.color = 'yellow'; } function changeColorOnMouseOut() { var control = document.getElementById("btn"); control.style.background = 'black'; control.style.color = 'white'; } [/script] Events are very useful in real-world applications. For example they can be used to 1. Display confirmation dialog box on submitting a form 2. Form data validation and many more How to show confirmation dialog in JavaScript [input type="submit" value="Submit" id="btn" onclick="return confirmSubmit()" /] [script type="text/javascript"] function confirmSubmit() { if (confirm("Are you sure you want to submit")) { alert("You selected OK"); return true; } else { return false; confirm("You selected cancel"); } } [/script] JavaScript form validation example : In this example, both First Name and Last Name fields are required fields. When you type the first character in any of the textbox, the background colour is automatically changed to green. If you delete all the characters you typed or if you leave the textbox without entering any characters the background colour changes to red indicating the field is required. We made this possible using onkeyup and onblur events. onkeyup occurs when the user releases a key. onblur occurs when an element loses focus. [table] [tr] [td] First Name [/td] [td] [input type="text" id="txtFirstName" onkeyup="validateRequiredField('txtFirstName')" onblur="validateRequiredField('txtFirstName')"/] [/td] [/tr] [tr] [td] Last Name [/td] [td] [input type="text" id="txtLastName" onkeyup="validateRequiredField('txtLastName')" onblur="validateRequiredField('txtLastName')"/] [/td] [/tr] [/table] [script type="text/javascript"] function validateRequiredField(controlId) { var control = document.getElementById(controlId); control.style.color = 'white'; if (control.value == "") { control.style.background = 'red'; } else { control.style.background = 'green'; } } [/script]
Views: 67983 kudvenkat
Change background image using Javascript with Html Button
 
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change the image of body using html button by applying javascript function.. onclick method is used on button.
Views: 6558 owais ali
Assigning event handlers in JavaScript using DOM object property
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/01/assigning-event-handlers-in-javascript.html In JavaScript there are several ways to associate an event handler to the event. In Part 36, we discussed, associating event handler methods to events using the attributes of HTML tags. In this video we will discuss using DOM object property to assign event handlers to events. First let us understand, what is DOM DOM stands for Document Object Model. When a browser loads a web page, the browser creates a Document Object Model of that page. The HTML DOM is created as a tree of Objects. Example : [html] [head] [title]My Page Title[/title] [/head] [body] [script type="text/javascript"] [/script] [div] [h1]This is browser DOM[/h1] [/div] [/body] [/html] JavaScript can be used to access and modify these DOM objects and their properties. For example, you can add, modify and remove HTML elements and their attributes. Along the same lines, you can use DOM object properties to assign event handlers to events. We will discuss the DOM object in detail in a later video session. We will continue with the same examples that we worked with in Part 36. Notice that in this case, we are assigning event handlers using the DOM object properties (onmouseover & onmouseout) instead of using the attributes of the HTML tag. We are using this keyword to reference the current HTML element. In this example "this" references the button control. [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onmouseover = changeColorOnMouseOver; document.getElementById("btn").onmouseout = changeColorOnMouseOut; function changeColorOnMouseOver() { this.style.background = 'red'; this.style.color = 'yellow'; } function changeColorOnMouseOut() { this.style.background = 'black'; this.style.color = 'white'; } [/script] The following example is same as the above. In this case we are assigning an anonymous function to onmouseover & onmouseout properties. [input type="button" value="Click me" id="btn" /] [script type="text/javascript"] document.getElementById("btn").onmouseover = function () { this.style.background = 'red'; this.style.color = 'yellow'; } document.getElementById("btn").onmouseout = function () { this.style.background = 'black'; this.style.color = 'white'; } [/script] If an event handler is assigned using both, i.e an HTML attribute and DOM object property, the handler that is assigned using the DOM object property overwrites the one assigned using HTML attribute. Here is an example. [input type="button" value="Click me" id="btn" onclick="clickHandler1()"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler set using HTML attribute"); } function clickHandler2() { alert("Handler set using DOM object property"); } [/script] Using this approach you can only assign one event handler method to a given event. The handler that is assigned last wins. In the following example, Handler2() is assigned after Handler1. So Handler2() owerites Handler1(). [input type="button" value="Click me" id="btn"/] [script type="text/javascript"] document.getElementById("btn").onclick = clickHandler1; document.getElementById("btn").onclick = clickHandler2; function clickHandler1() { alert("Handler 1"); } function clickHandler2() { alert("Handler 2"); } [/script]
Views: 50322 kudvenkat
How to change background color on click in HTML5, CSS3 and JAVASCRIPT
 
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In this video I am going to show you how to change a background color by one click by using HTML5 , CSS3 and javascript........ . ********************************** for more videos like and subscribe..... *********************************** List of social media profiles Website: *********************************** Credits : Baig's Collection . . For more videos follows me on Facebook: https://m.facebook.com/groups/187814485149815?ref=bookmarks ++++++++++++++++==================++++++++++++++ Youtube: https://www.youtube.com/channel/UC0BZyu2LWjVg0fcr6Vo3d_g?view_as=subscriber ++++++++++++++++==================++++++++++++++ Blogs: http://itrixworld.blogspot.com/ ++++++++++++++++==================++++++++++++++
Views: 2920 ItriX World
Style binding in angular 2
 
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Text version of the video http://csharp-video-tutorials.blogspot.com/2017/06/style-binding-in-angular-2.html Slides http://csharp-video-tutorials.blogspot.com/2017/06/style-binding-in-angular-2_29.html Angular 2 Tutorial playlist https://www.youtube.com/playlist?list=PL6n9fhu94yhWqGD8BuKuX-VTKqlNBj-m6 Angular 2 Text articles and slides http://csharp-video-tutorials.blogspot.com/2017/06/angular-2-tutorial-for-beginners_12.html All Dot Net and SQL Server Tutorials in English https://www.youtube.com/user/kudvenkat/playlists?view=1&sort=dd All Dot Net and SQL Server Tutorials in Arabic https://www.youtube.com/c/KudvenkatArabic/playlists In this video we will discuss Style binding in Angular with examples. Setting inline styles with style binding is very similar to setting CSS classes with class binding. Please wtach Class binding video from Angular 2 tutorial before proceeding with this video. Notice in the example below, we have set the font color of the button using the style attribute. import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: ` [button style="color:red"]My Button[/button] ` }) export class AppComponent { } The following example sets a single style (font-weight). If the property 'isBold' is true, then font-weight style is set to bold else normal. import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: ` [button style='color:red' [style.font-weight]="isBold ? 'bold' : 'normal'"]My Button [/button] ` }) export class AppComponent { isBold: boolean = true; } style property name can be written in either dash-case or camelCase. For example, font-weight style can also be written using camel case - fontWeight. Some styles like font-size have a unit extension. To set font-size in pixels use the following syntax. This example sets font-size to 30 pixels. import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: ` [button style='color:red' [style.font-size.px]="fontSize"]My Button [/button] ` }) export class AppComponent { fontSize: number = 30; } To set multiple inline styles use NgStyle directive 1. Notice the color style is added using the style attribute 2. ngStyle is binded to addStyles() method of the AppComponent class 3. addStyles() method returns an object with 2 key/value pairs. The key is a style name, and the value is a value for the respective style property or an expression that returns the style value. 4. let is a new type of variable declaration in JavaScript. 5. let is similar to var in some respects but allows us to avoid some of the common “gotchas” that we run into when using var. 6. The differences between let and var are beyond the scope of this video. For our example, var also works fine. 7. As TypeScript is a superset of JavaScript, it supports let import { Component } from '@angular/core'; @Component({ selector: 'my-app', template: ` [button style='color:red' [ngStyle]="addStyles()"]My Button[/button] ` }) export class AppComponent { isBold: boolean = true; fontSize: number = 30; isItalic: boolean = true; addStyles() { let styles = { 'font-weight': this.isBold ? 'bold' : 'normal', 'font-style': this.isItalic ? 'italic' : 'normal', 'font-size.px': this.fontSize }; return styles; } }
Views: 66852 kudvenkat
JavaScript for getElementById
 
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Introduction JavaScript JavaScript is a scripting or programming language that allows you to implement complex things on web pages — every time a web page does more than just sit there and display static information for you to look at — displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. • HTML is the markup language that we use to structure and give meaning to our web content, for example defining paragraphs, headings, and data tables, or embedding images and videos in the page. • CSS is a language of style rules that we use to apply styling to our HTML content, for example setting background colors and fonts, and laying out our content in multiple columns. • JavaScript is a scripting language that enables you to create dynamically updating content, control multimedia, animate images, and pretty much everything else. (Okay, not everything, but it is amazing what you can achieve with a few lines of JavaScript code.) Before You Starting JavaScript You should know basic HTML and CSS
Views: 103 Web Master
CSS styles in JavaScript (setting and getting) - Beau teaches JavaScript
 
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How to set CSS properties and styles in JavaScript. Also how to get CSS. This video covers style, cssText, setAttribute, and getComputedStyle. 💻 Code: https://codepen.io/beaucarnes/pen/EmVmbZ?editors=1010 🔗 Resource: https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Properties_Reference 🐦 Beau Carnes on Twitter: https://twitter.com/carnesbeau ⭐JavaScript Tutorials Playlists⭐ ▶JavaScript Basics: https://www.youtube.com/playlist?list=PLWKjhJtqVAbk2qRZtWSzCIN38JC_NdhW5 ▶Data Structures and Algorithms: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkso-IbgiiP48n-O-JQA9PJ ▶Design Patterns: https://www.youtube.com/playlist?list=PLWKjhJtqVAbnZtkAI3BqcYxKnfWn_C704 ▶ES6: https://www.youtube.com/playlist?list=PLWKjhJtqVAbljtmmeS0c-CEl2LdE-eR_F ▶Clean Code: https://www.youtube.com/playlist?list=PLWKjhJtqVAbkK24EaPurzMq0-kw5U9pJh - We're busy people who learn to code, then practice by building projects for nonprofits. Learn Full-stack JavaScript, build a portfolio, and get great references with our open source community. Join our community at https://freecodecamp.com Read great tech articles at https://medium.freecodecamp.com
Views: 8382 freeCodeCamp.org
How to make Javascript Random Background Color
 
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you will need to change dynamically your web page background color then you try to this.
Views: 1948 Md Khaled
Change Body Background Color Using Color Box - Java Script
 
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Views: 4008 DarkCode
How to Replace Your HTML Elements by Using CSS
 
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How to Replace Your HTML Elements by Using CSS. Part of the series: HTML Basics. One way that you can replace your HTML elements is through the use of CSS. Replace your HTML elements by using CSS with help from a web and graphics specialist in this free video clip. Read more: http://www.ehow.com/video_12219281_replace-html-elements-using-css.html
Views: 259 eHowTech
JavaScript tutorials for beginners in Hindi - 23 - Changing CSS with javascript
 
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In this video I will show you changing CSS with javascript. I will show you that how can you change background color with javascript, change font size with javascript, change background color of body with javascript. For all my tutorials go to: http://websofttutorials.com/ Facebook: https://www.facebook.com/websofttutorials/ Twitter: https://twitter.com/websofttutorial Google Plus: https://plus.google.com/103170090189141800172/posts
Views: 11929 websofttutorials
Where should the script tag be placed in html
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2014/11/where-should-script-tag-be-placed-in.html In this video we will discuss, where should the script tag be placed in the html. Should it be placed in the body or head section of the page. In general the script tag can be placed either in the head or body section. Let's look at a few examples : Example 1 : Script tag in the head section [html] [head] [script type="text/javascript"] alert("Welcome to JavaScript Tutorial"); [/script] [/head] [body] [form id="form1" runat="server"] [/form] [/body] [/html] Example 2 : Script tag in the body section [html] [head] [/head] [body] [form id="form1" runat="server"] [/form] [script type="text/javascript"] alert("Welcome to JavaScript Tutorial"); [/script] [/body] [/html] In Example 1 we placed the script tag in the head section and in Example 2, we placed it in body section. In both the cases JavaScript works as expected. Example 3 : Sets the background color of the TextBox to red. [html] [head] [/head] [body] [form id="form1" runat="server"] [asp:TextBox ID="TextBox1" runat="server"][/asp:TextBox] [/form] [script type="text/javascript"] document.getElementById("TextBox1").style.backgroundColor = "red"; [/script] [/body] [/html] Example 4 : This is same as Example 3, except we moved the script tag to the head section. In this case the script will not work as expected. Depending on the browser you are using you get one of the following JavaScript error. Firefox - TypeError: document.getElementById(...) is null Chrome - Uncaught TypeError: Cannot read property 'style' of null IE - Unable to get property 'style' of undefined or null reference To see these JavaScript errors press F12 which launches developer tools. F12 works for all the 3 browsers. [html] [head] [script type="text/javascript"] document.getElementById("TextBox1").style.backgroundColor = "red"; [/script] [/head] [body] [form id="form1" runat="server"] [asp:TextBox ID="TextBox1" runat="server"][/asp:TextBox] [/form] [/body] [/html] Why did the JavaScript did not work in this case JavaScript code is present before the textbox control. By the time the JavaScript code is executed, the textbox is still not loaded into browser DOM (Document Object Model). This is the reason JavaScript can't find the textbox and throws a NULL reference error. In Part 6, we discussed that, in general it is a good practice to store JavaScript in an external .js file. So, if the JavaScript is present in an external file and if you are referencing it on a page using [script] element, where should such [script] element be placed. To answer this question, first let's understand what happens when a browser starts loading a web page. 1. The browser starts parsing the HTML 2. When the parser encounters a [script] tag that references an external JavaScript file. The parser stops parsing the HTML and the browser makes a request to download the script file. Until the download is complete, the parser is blocked from parsing the rest of the HTML on the page. 3. When the download is complete, that's when the parser will resume to parse the rest of the HTML. This means the page loading is stopped until all the scripts are loaded which affects user experience. In general, the suggested good practice is to place the [script] tag just before the closing [body] tag, so it doesn't block the HTML parser. However, modern browsers support async and defer attributes on scripts. These attributes tell the browser it's safe to continue parsing while the scripts are being downloaded. But even with these attributes, from a performance standpoint it is still better to place [script] tag just before closing [body] tag. According to HTTP/1.1 specification browsers download no more than two components in parallel. So, if the page has several images to download and if you place [script] tags at the top of the page, the script files start to download first which blocks the images download which adds to the total page load time.
Views: 95211 kudvenkat
change DIV Background every second with #Jquery
 
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change Background every second with #Jquery
Views: 6966 Issa Abdullah
jQuery #id selector
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/03/jquery-id-selector.html In this video we will discuss 1. What are jQuery selectors 2. Different selectors in jQuery 3. #id selector in jquery What are jQuery selectors One of the most important concept in jQuery is selectors. jQuery selectors allow you to select and manipulate HTML elements. Different selectors in jQuery jQuery selectors allow you to select html elements in the DOM by 1. Element ID 2. Element Tag Name 3. Element Class Name 4. Element attribute 5. Element Attribute values and many more Id selector in jquery To find an HTML element by ID, use the jQuery #id selector Example : The following example finds button with ID button1 and attaches the click event handler. [html] [head] [title][/title] [script src="jquery-1.11.2.js"][/script] [script type="text/javascript"] $(document).ready(function () { $('#button1').click(function () { alert('jQuery Tuorial'); }); }); [/script] [/head] [body] [input id="button1" type="button" value="Click Me" /] [/body] [/html] Changes the background colour of the button to yellow $(document).ready(function () { $('#button1').css('background-color', 'yellow'); }); Important points to remember about jQuery #id selector 1. jQuery #id selector uses the JavaScript document.getElementById() function 2. jQuery #id selector is the most efficient among all jQuery selectors. If you know the id of an element that you want to find, then always use the #id selector. 3. HTML element IDs must be unique on the page. jQuery #id selector returns only the first element, if you have 2 or more elements with the same ID. [html] [head] [title][/title] [script src="jquery-1.11.2.js"][/script] [script type="text/javascript"] $(document).ready(function () { $('#button1').css('background-Color', 'yellow'); }); [/script] [/head] [body] [input id="button1" type="button" value="Click Me" /] [input id="button1" type="button" value="Click Button" /] [/body] [/html] 4. JavaScript's document.getElementById() function throws an error if the element with the given id is not found, where as jQuery #id selector will not throw an error. To check if an element is returned by the #id selector use length property. [html] [head] [title][/title] [script src="jquery-1.11.2.js"][/script] [script type="text/javascript"] $(document).ready(function () { if ($('#button1').length ] 0) { alert('Element found') } else { alert('Element not found') } }); [/script] [/head] [body] [input id="button1" type="button" value="Click Me" /] [/body] [/html] 5. JavaScript's document.getElementById() and jQuery(#id) selector are not the same. document.getElementById() returns a raw DOM object where as jQuery('#id') selector returns a jQuery object that wraps the DOM object and provides jQuery methods. This is the reason you are able to call jQuery methods like css(), click() on the object returned by jQuery. To get the underlying DOM object from a jQuery object write $('#id')[0] 6. document.getElementById() is faster than jQuery('#id') selector. Use document.getElementById() over jQuery('#id') selector unless you need the extra functionality provided by the jQuery object.
Views: 155721 kudvenkat
change background color on button click using javascript
 
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OM INFO TECH IT EXECUTION
Views: 7078 Vivek Kumar
Onlick event, getElementById method, changing a button's text and text color
 
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In this video we demonstrate the onclick method and how to dynamically change the button's attributes with JavaScript.
Views: 19887 vasillis-javed khan
Using JavaScripts tO Change FacebOok background Color [ 100% works ] [2012]
 
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users should Get mozilla firefox before using scripts ! BLUEBAR SIDE NAME COLOR: javascript:void(document.getElementById('blueBar').style.background='red') within the brackets you can write any color for example : javascript:void(document.getElementById('blueBar').style.background='GREEN') INFOBAR SIDE COLOR: javascript:void(document.getElementById('content'). style.background='orange')
Views: 1002 Junglee94
Custom Alert Box Programming JavaScript CSS HTML Tutorial
 
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Lesson Code: http://www.developphp.com/video/JavaScript/Custom-Alert-Box-Programming-Tutorial JavaScript comes equipped with stock dialog boxes that work well enough for alerting, confirming, and prompting for values. But most of the top interactive websites create their own custom dialog windows. Creating these windows yourself gives you more control over the interaction with the user, and allows you to customize every single aspect of the dialog window. In this first video lesson we will cover creating a dynamic custom alert box dialog from scratch. In the two following videos we will cover confirm and prompt boxes.
Views: 98625 Adam Khoury
Android Basic Calculator/colorful  Using IntelXdk | Fully Tested On device.
 
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I have explained how to create an Android application using intelXdk in which the app is built on HTML5 . I assume you have basic knowledge of HTML,JAVASCRIPT, AND CSS . # I have written the code to avoid wastage of time . # here is the code , copy and paste them according to the video . #connect your phone via a usb cable so that on every Ctrl+s , you can see the changes as live layout . #The code . // for Button Clearing // will clear all input fields . document.getElementById('result').value=""; document.getElementById('numFirst').value=""; document.getElementById('numSecond').value=""; // adding , substraction, multiplication , division // just change the sign of each accordingly . var num1 = document.getElementById('numFirst').value; var num2 = document.getElementById('numSecond').value; // these values have to be converted to integer to avoid concatination var result = parseInt(num1)+parseInt(num2); // setting the result field input document.getElementById('result').value=result; // for changing the background color document.body.style.backgroundColor="black"; // themesChange button // this is only changing backgrounds of the buttons in order to make it look colorful if(document.body.style.backgroundColor==="black"){ document.body.style.backgroundColor="darkcyan"; document.getElementById('numFirst').style.backgroundColor="darkcyan"; document.getElementById('numSecond').style.backgroundColor="darkcyan"; document.getElementById('result').style.backgroundColor="darkcyan"; document.getElementById('addition').style.backgroundColor="darkcyan"; document.getElementById('division').style.backgroundColor="darkcyan"; document.getElementById('substraction').style.backgroundColor="darkcyan"; document.getElementById('multiplication').style.backgroundColor="darkcyan"; document.getElementById('clearing').style.backgroundColor="darkcyan"; document.getElementById('themesChange').style.backgroundColor="darkcyan"; } // just to toggle the colors else{ document.body.style.backgroundColor="black"; document.getElementById('numFirst').style.backgroundColor="black"; document.getElementById('numSecond').style.backgroundColor="black"; document.getElementById('result').style.backgroundColor="black"; document.getElementById('addition').style.backgroundColor="darkcyan"; document.getElementById('division').style.backgroundColor="darkcyan"; document.getElementById('substraction').style.backgroundColor="darkcyan"; document.getElementById('multiplication').style.backgroundColor="darkcyan"; document.getElementById('clearing').style.backgroundColor="black"; document.getElementById('themesChange').style.backgroundColor="black"; } // the styling part // you can create an external stylesheet and add the link to the index.html page . // don't forget to put the css file inside angle bracket tags // youtube doesn't allow putting "style -- /style" tags . #numFirst,#numSecond,#result{ margin-top:20px; border-left-width:0px; border-right-width:0px; border-top-width:0px; width:90%; margin-left:20px; background-color:black; color:white; } #result{ margin-bottom:20px; } #additon{ border-width:0px; background-color:cornflowerblue; color:white; } #substraction{ border-width:0px; background-color:blueviolet; color:white; } #division{ border-width:0px; background-color:coral; color:white; } #multiplication{ border-width:0px; background-color:crimson; color:white; } #clearing,#themesChange{ background-color:darkseagreen; color:white; border-width:0px; } // Hope , I have helped you . // Thanks For watching and best of luck .
Views: 788 _ hackTech
42.Background Color Selector Using JavaScript | Javascript Beginners Tutorial
 
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This video tutorial helps you to background color selector using javascript.This tutorial series mainly concentrates on beginners. Subscribe here : https://www.youtube.com/channel/UCEIKAz93EgODsp0L6lc_Axw?sub_confirmation=1
Views: 29 Coding Magicians
How to check if JavaScript is enabled
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/02/how-to-check-if-javascript-is-enabled.html In this video we will discuss how to check if JavaScript is enabled or disabled. Let us understand this with an example. We have a page that captures Name and Gender. Both fields are required. The page relies on JavaScript being enabled for performing validation. We should always have server side validation irrespective of whether we have client side validation or not. It is not a good practice to rely just on client side validation, but for the purpose of this demo, let us say we only have client side validation. If JavaScript is enabled then we want to display the Name and Gender elements and the user can continue to use the application. If JavaScript is disabled then we want to hide the Name and Gender elements and we want to display the following message. It seems that you have disabled JavaScript. Please enable JavaScript. The easiest way to detect if JavaScript is enabled is by using noscript tag. The content inside the [noscript] element will be displayed only if scripts are not supported, or are disabled in the user's browser. [noscript] [style type="text/css"] .rootDiv { display: none; } [/style] [h1]It seems that you have disabled JavaScript. Please enable JavaScript.[/h1] [/noscript] [div id="rootElement" class="rootDiv"] [table border="1"] [tr] [td] Name [/td] [td] [input id="txtName" type="text" onfocus="validateIfEmpty('txtName')" onblur="validateIfEmpty('txtName')" onkeyup="validateIfEmpty('txtName')" /] [/td] [/tr] [tr] [td] Gender [/td] [td] [input id="txtGender" type="text" onfocus="validateIfEmpty('txtGender')" onblur="validateIfEmpty('txtGender')" onkeyup="validateIfEmpty('txtGender')" /] [/td] [/tr] [/table] [/div] [script type="text/javascript"] function validateIfEmpty(control) { var controlToValidate = document.getElementById(control); if (controlToValidate.value == "") { controlToValidate.style.background = "red"; } else { controlToValidate.style.background = "white"; } } [/script]
Views: 22660 kudvenkat
Javascript - Changing HTML elements
 
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This tutorial gives an introduction to Javascript by changing HTML elements on the onclick event with the document.getElementById() method.
Views: 3631 Tutormeonlineza
Change your Body Background color on click using Javascript and CSS!!!!
 
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Try yourself and enjoy learning web development!!!! SPECIAL THANKS TO HARI DULAL... Link to his channel: https://www.youtube.com/channel/UCl_abwEXklrjHWOIV87sCFQ?
Views: 316 Birat Acharya
Javascript - Change element CSS by ID using onclick event
 
02:44
A simple video showing how to change the CSS of an element by assigning it an ID and using the click of a button. In this example we will be changing the font size of a p tag, it will be changing from a smaller text to a larger text once the button is clicked. Comment below if you have any other questions and I'll be more than happy to help you out. Also comment below for any future videos you would like to see! SUBSCRIBE!
Views: 883 Ninja Dev Max
JavaScript password strength checker
 
10:48
Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/03/javascript-password-strength-checker.html In this video we will discuss how to implement a simple password strength checker using JavaScript. As we type the password in the password TextBox, the strength of the password should be displayed in a label control. The password strength is determined based on the following scoring criteria. If the password contain atleast 8 characters - 20 Points If the password contain atleast 1 lowercase letter - 20 Points If the password contain atleast 1 uppercase letter - 20 Points If the password contain atleast 1 number - 20 Points If the password contain atleast 1 special character - 20 Points The password strength is determined using the following scale. Password Score - Password Strength ]= 100 - Strong ]= 80 - Medium ]= 60 - Weak [ 60 - Very Weak Example : [asp:TextBox ID="TextBox1" runat="server" TextMode="Password" onkeyup="checkPasswordStrength()"] [/asp:TextBox] [asp:Label ID="lblMessage" runat="server"][/asp:Label] [script type="text/javascript"] function checkPasswordStrength() { var passwordTextBox = document.getElementById("TextBox1"); var password = passwordTextBox.value; var specialCharacters = "!£$%^&*[email protected]#~?"; var passwordScore = 0; passwordTextBox.style.color = "white"; // Contains special characters for (var i = 0; i [ password.length; i++) { if (specialCharacters.indexOf(password.charAt(i)) ] -1) { passwordScore += 20; break; } } // Contains numbers if (/\d/.test(password)) passwordScore += 20; // Contains lower case letter if (/[a-z]/.test(password)) passwordScore += 20; // Contains upper case letter if (/[A-Z]/.test(password)) passwordScore += 20; if (password.length ]= 8) passwordScore += 20; var strength = ""; var backgroundColor = "red"; if (passwordScore ]= 100) { strength = "Strong"; backgroundColor = "green"; } else if (passwordScore ]= 80) { strength = "Medium"; backgroundColor = "gray"; } else if (passwordScore ]= 60) { strength = "Weak"; backgroundColor = "maroon"; } else { strength = "Very Weak"; backgroundColor = "red"; } document.getElementById("lblMessage").innerHTML = strength; passwordTextBox.style.backgroundColor = backgroundColor; } [/script]
Views: 18441 kudvenkat
Change Background Colors with JavaScript and Input Range Sliders (Part 1)
 
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Use JavaScript and the HTML5 input type range element to make sliders that change the background color of a page dynamically. demo file: http://www.ralphphillips.com/youtube/background-sliders.html
Views: 11112 Ralph Phillips
JavaScript: Modify CSS
 
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A video tutorial showing you how to modify CSS code using JavaScript http://www.abell12.com Follow us on Twitter http://ww.twitter.com/abell12youtube
Views: 685 abell12
Facebook Best 4 Hacks
 
01:27
Codes: 1.Backcolol javascript:void(document.getElementById( 'fb_menubar').style.background='red') 2.Change Name javascript:void(document.title="Facebook | Neo"); 3.Chatlog javascript:buddyList.itemOnClick(ID_HERE ); 4.ChatClose javascript:chatDisplay.tabs[ID_HERE].tab XOnClick(); sorry for false music
Views: 21643 hacks1001
Change gridview row color when checkbox is checked
 
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Link for all dot net and sql server video tutorial playlists http://www.youtube.com/user/kudvenkat/playlists Link for slides, code samples and text version of the video http://csharp-video-tutorials.blogspot.com/2015/03/change-gridview-row-color-when-checkbox.html In this video we will discuss how to change gridview row color when checkbox is checked. We want to achieve this using JavaScript. The background color of the rows that are select should be grey, and the rows that are not selected should be white. We will continue with the example that we worked with in Part 3 of JavaScript with ASP.NET tutorial. Modify HeaderCheckBoxClick() and ChildCheckBoxClick() JavaScript functions as shown below. [script type="text/javascript" language="javascript"] function HeaderCheckBoxClick(checkbox) { var gridView = document.getElementById("GridView1"); for (i = 1; i [ gridView.rows.length; i++) { gridView.rows[i].cells[0].getElementsByTagName("INPUT")[0].checked = checkbox.checked; // Depending on whether the checkbox in the header is checked or // unchecked change the background color of the data rows in the GridView if (checkbox.checked) { gridView.rows[i].style.background = '#CCCCCC'; } else { gridView.rows[i].style.background = '#FFFFFF'; } } } function ChildCheckBoxClick(checkbox) { var atleastOneCheckBoxUnchecked = false; var gridView = document.getElementById("GridView1"); for (i = 1; i [ gridView.rows.length; i++) { // Depending on whether the checkbox in the data row is checked or // unchecked change the background color of the rows in the GridView if (gridView.rows[i].cells[0].getElementsByTagName("INPUT")[0].checked == false) { gridView.rows[i].style.background = '#FFFFFF'; atleastOneCheckBoxUnchecked = true; } else { gridView.rows[i].style.background = '#CCCCCC'; } } gridView.rows[0].cells[0].getElementsByTagName("INPUT")[0].checked = !atleastOneCheckBoxUnchecked; } [/script] The following code makes the text in a GridView row bold on mouseover and normal on mouseout protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e) { if (e.Row.RowType == DataControlRowType.DataRow) { e.Row.Attributes.Add("onmouseover", "this.style.fontWeight = 'bold';"); e.Row.Attributes.Add("onmouseout", "this.style.fontWeight= 'normal';"); } }
Views: 17013 kudvenkat
Javascript Tutorial Part 8: Javascript getElementById
 
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http://www.frameworktv.com | LearnToProgram is now Framework. Visit and join for free daily videos teaching digital skills like coding and design. SUBSCRIBE TO THE FRAMEWORK CHANNEL http://www.youtube.com/subscription_center?add_user=UC4msOaZNMfPwMe_ztV5jFH SUBSCRIBE TO OUR EMAIL LIST (LEARN FOR FREE!) http://www.frameworktv.com/?src=YOUTUBE The Javascript getElementById method is one of the most important Javascript functions. However, many programmers who are just starting out have trouble with it. In this Javascript tutorial, Mark discusses how to use the Javascript getElementById method. Mark demonstrates how to dynamically change stylesheet rules, change content within a div and read a text box with the Javascript getElementById. Continue learning Javascript as instructor Mark Lassoff reviews the Javascript getElementById function. VISIT US ON FACEBOOK https://www.facebook.com/frameworkTechnicallySpeaking/ FOLLOW ON TWITTER https://twitter.com/fw_social INSTAGRAM https://www.instagram.com/frameworksocial/
login page with background image slider using html and css
 
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Click on the Url for Source code :- https://github.com/KamranRu/YouFortubers/tree/master
Views: 312 Designing World
how to hack facebook background coler's
 
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type this inn the addres bar javascript:void(document.getElementById('fb_menubar').style.background='red'); you can change the coler like red black pink and more...
Views: 1026 probros3
31: How To Change CSS Using JavaScript | Document Object Model Tutorial | JavaScript Tutorial
 
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In this JavaScript tutorial you will learn how to change CSS using JavaScript as well as creating CSS. ➤ CHECK OUT THESE AWESOME PEOPLE! Daniel Simionescu Meet Daniel: another Full-Stack developer who can teach you coding fast and free :D https://www.youtube.com/channel/UCPIe87uLDW-QZ5FnUZqdxoA ➤ GET ACCESS TO MY LESSON MATERIAL HERE! First of all, thank you for all the support you have given me! I am really glad to have such an awesome community on my channel. It motivates me to continue creating and uploading content! So thank you! I am now using Patreon to share improved and updated lesson material, and for a small fee you can access all the material. I have worked hard, and done my best to help you understand what I teach. I hope you will find it helpful :) Material for this lesson: https://www.patreon.com/posts/javascript-31-21366182
Views: 3138 mmtuts
JavaScript beginner tutorial 25 - changing an image source
 
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In this tutorial I show you how to change images in JavaScript changing the value of the "src" property. Don't forget to subscribe: http://www.youtube.com/user/QuentinWatt For collaborations and business inquiries, please contact via Channel Pages: http://ChannelPages.com/QuentinWatt Social links: ------------------------------------------------------------- Add me on twitter: http://www.twitter.com/QuentinWatt facebook group: https://www.facebook.com/quentin.watt -------------------------------------------------------------
Views: 101077 Quentin Watt Tutorials
Change Background Select Color in CSS
 
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Change the background select color using only css... when the mouse is clicked and drag.
Views: 102 sleek code
JavaScript DOM : How to get/find 'body' and introducing getElementById
 
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JavaScript DOM : How to get/find 'body' and introducing getElementById
Views: 162 Mian Zadid Rusdid
How to Use CSS Tutorial (Cascading Style Sheets)
 
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http://www.frameworktv.com | LearnToProgram is now Framework. Visit and join for free daily videos teaching digital skills like coding and design. SUBSCRIBE TO THE FRAMEWORK CHANNEL http://www.youtube.com/subscription_center?add_user=UC4msOaZNMfPwMe_ztV5jFH SUBSCRIBE TO OUR EMAIL LIST (LEARN FOR FREE!) http://www.frameworktv.com/?src=YOUTUBE CSS (Cascading Style Sheets) are an important facet to quality web development. While your HTML code provides structure to the page it is the CSS code that allows you to create a pleasing design. In this video master trainer Mark Lassoff takes you through the basics of CSS code. This video is designed to be "just enough" to get you started using CSS code. Mark covers embedded styles sheets in the document head, attached style sheets, styling text, sizing divs and several ever concepts to help you get started with using css code. He will show you how to properly use a CSS selector and a CSS property. VISIT US ON FACEBOOK https://www.facebook.com/frameworkTechnicallySpeaking/ FOLLOW ON TWITTER https://twitter.com/fw_social INSTAGRAM https://www.instagram.com/frameworksocial/
CSS Inline Block-Hindi
 
03:52
What is the use of CSS Inline Block and how to use it to make website more beautiful. You can download all the examples from 1st video of CSS Tutorial-CSS Overview Facebook- https://www.facebook.com/PooriPadhai Google Plus- https://plus.google.com/+PooriPadhai Twitter- https://twitter.com/pooripadhai Pooripadhai - http://pooripadhai.com/
Views: 428 Poori Padhai
JavaScript beginner tutorial 24 - referencing elements in JavaScript
 
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In this tutorial I show you to reference elements on your web page using the document.getElementById() method. Don't forget to subscribe: http://www.youtube.com/user/QuentinWatt For collaborations and business inquiries, please contact via Channel Pages: http://ChannelPages.com/QuentinWatt Social links: ------------------------------------------------------------- Add me on twitter: http://www.twitter.com/QuentinWatt facebook group: https://www.facebook.com/quentin.watt -------------------------------------------------------------
Views: 53186 Quentin Watt Tutorials
JavaScript Tutorial - CSS computed style - getComputedStyle() - CSSStyleDeclaration Object
 
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partial interface Window { [NewObject] CSSStyleDeclaration getComputedStyle(Element elt, optional DOMString pseudoElt); }; https://github.com/webtunings https://www.facebook.com/pages/WebTunings/339234242822202 I highly recommend this book for beginners as well as advanced programmers: http://www.amazon.com/gp/product/0596805527/ref=as_li_qf_sp_asin_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0596805527&linkCode=as2&tag=webtuningscom-20
Views: 770 WebTunings
JavaScript Tutorial | getElementById in JavaScript | Vishal Malviy
 
03:03
javascript getelementbyid. getelementbyid() method accesses the specific form element by its ID, and then you may revise its content. Example. Change the HTML content of a p element with id="demo": document.getElementById("demo").innerHTML = "Paragraph changed!";
Views: 388 codeash
How To Change The Color of  Facebook Menu Bar
 
02:57
Simple trick on how to change the color of your facebook menu bar.. Subscribe for more Facebook Tricks.. Here's the javascript for this trick: javascript:void(document.getElementById('fb_menubar').style.background='red');
Views: 7932 MsTrickies
JavaScript Tutorial for Beginners - 32 - Changing an image
 
03:45
In this video we will discuss how to change an image. Javascript code: http://pastebin.com/iUahHirr HTML code: http://pastebin.com/GiSXfSXY
Views: 36312 EJ Media
Simple flat design Button | HTML & CSS
 
06:25
This is a simple flat design button. Music: NCS Video made by JulianFun123 YT- https://youtube.com/julianfun123 TW- https://twitter.com/julianfun123yt Instagram- https://instagram.com/julianfun123
Views: 67 Riopo Code
Change background color of webpage using html5 color input field and java script..
 
05:03
Change background color of webpage using html5 color input field and java script..
Views: 685 hemant singh
Angular js Basic Tutorial how to change background color of text box
 
03:39
Angular js code to change textbox background colour. Angular js code is always smaller in length and has more value than all other scripting languages.simpler to use.
Views: 446 rocking galaxy
#7 how to make button in many colors with css only
 
03:16
#7 how to make button in many colors with css only ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ subscribe , like , comment and share ــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــــ gruop facebook : www.facebook.com/elsawyweb
Views: 4284 HESHAM ELSAWY
How to change background color according to user using color picker tool? | HTML
 
03:18
How to change background color according to user using color picker tool? | HTML In this video you will learn how to change background color according to user's wish using color picker input field in HTML. Also requires coding in javascript for changing background color. I hope you enjoy the video. For more videos subscribe my channel. Also visit and like my Facebook page: https://www.facebook.com/akashasylum01/ Thank You!!!
Views: 572 Akash Asylum

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