jQuery Examples - calling jQuery library functions

As almost everything we do when using jQuery reads or manipulates the document object model (DOM), we need to make sure that we start adding events etc. as soon as the DOM is ready.

If you want an event to work on your page, you should call it inside the $(document).ready() function. Everything inside it will load as soon as the DOM is loaded and before the page contents are loaded.

To do this, we register a ready event for the document as follows −

$(document).ready(function() {
   // do stuff when DOM is ready
});

To call upon any jQuery library function, use HTML script tags as shown below −

Live Demo

<html>
   <head>
      <title>The jQuery Example</title>
      <script type = "text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js">
      </script>
      <script type = "text/javascript" language = "javascript">
         $(document).ready(function() {
            $("div").click(function() {alert("Hello, world!");});
         });
      </script>
   </head>
 
   <body>
      <div id = "mydiv">
         Click on this to see a dialogue box.
      </div>
   </body>
</html>

This will produce following result −

jqueryexamples_environment.htm