What is JavaScript? JavaScript is a client-side scripting language which is used to create a dynamic webpage. It is integrated with the HTML code. JavaScript code is inserted between and tags as shown below. document.getElementById("demoId").innerHTML = "JavaScript Example"; JavaScript is a programming language that adds rich interactivity to your website (for example: games, responses when buttons are pressed or data entered in forms, dynamic styling, animation etc..). In its most common form, JavaScript resides inside HTML documents, and can provide levels of interactivity to web pages that are not achievable ... Read More

Create external JavaScript file with the extension .js. After creating, add it to the HTML file in the script tag. The src attribute is used to include that external JavaScript file.If you have more than one external JavaScript file, then add it in the same web page to increase performance of the page.Let’s say the following new.js is our external JavaScript file −function display() {    alert("Hello World!"); }Now add the external JavaScript file to the HTML web page −                                      

You can place the tags, containing your JavaScript, anywhere within your web page, but it is normally recommended that you should keep it within the tag or tag.It’s good for performance to add JavaScript in element. Here’s an example to add under … −                               Here’s an example to add under … −                                        

With JavaScript, you can put JavaScript anywhere on the page, whether inside or tag. But, it is a good practice to add JavaScript in the footer i.e. just before closing the tag. This is because −It loads script faster.It will not block any DOM content to load.It loads the web page before loading JavaScriptImproves display speedPage loads faster

In HTML, the script tag can be inserted either in head section or in body section, generally the java script code is inserted between script open and close tags. //JavaScript code here We can insert any number of scripts in an HTML document. Scripts can be placed in , or section or in both of an HTML page. Now, let’s see if there is any difference if we insert script in body or head of HTML. It is better to place the java script before closing of the tag rather than ... Read More

To find whether the browser supports JavaScript or not, use the tag. The HTML tag is used to handle the browsers, which do recognize tag but do not support scripting. This tag is used to display an alternate text message.ExampleLive Demo           HTML noscript Tag                                                    Your browser does not support JavaScript!          

To redirect if JavaScript is not enabled in the web browser, add a script to the tag. Let us say you need to redirect to index.php if JavaScript is not enabled. ExampleHere’s how you can do this:           HTML noscript Tag                                                        html{display:none;}          

To find whether the browser supports JavaScript or nor, use the tag. The HTML tag is used to handle the browsers, which do recognize tag but do not support scripting. This tag is used to display an alternate text message.Here’s an example,           HTML noscript Tag                                              Your browser does not support JavaScript!          

To detect if JavaScript is disabled in a web browser, use the tag. The HTML tag is used to handle the browsers, which do recognize tag but do not support scripting. This tag is used to display an alternate text message.Here’s an example,           HTML noscript Tag                                                    Your browser does not support JavaScript!          

To let users know about non-JavaScript web browsers, use the tag. The HTML tag is used to handle the browsers, which do recognize tag but do not support scripting. This tag is used to display alternate text messageHere’s an example,           HTML noscript Tag                                              Your browser does not support JavaScript!