JAVASCRIPT

Building Pop-Up DIVs with the DOM and AJAX

Pop-up DIVs can be used for displaying static and dynamic content into any web page. This three-part series will show you how to create and use pop-up DIVs with AJAX and the DOM.

Author Info:

By: Alejandro Gervasio

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January 31, 2007

TABLE OF CONTENTS:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html;
charset=iso-8859-1" />
    <title>JavaScript-based Pop-Up Div</title>
    <style type="text/css">
      body{
        padding: 0;
        margin: 0;
        background: #fff;
      }
      h1{
        font: bold 24px Arial, Helvetica, sans-serif;
        color: #000;
      }
      .popupcontainer{
        width: 300px;
        padding: 10px;
        background: #eee;
        border: 1px solid #ccc;
        font: normal 12px Arial, Helvetica, sans-serif;
        color: #000;
      }
      .popupdiv{
        position: absolute;
        width: 200px;
        padding: 5px;
        background: #ffc;
        border: 1px solid #ccc;
        font: normal 12px Arial, Helvetica, sans-serif;
        color: #000;
      }
    </style>
    <script language="javascript">
      // display Pop Up div element
      function displayPopupDiv(e){
        var posx=0;
        var posy=0;
        if(!e){var e=window.event};
        // determine target DIV
        var targ=e.target?e.target:e.srcElement;
        // calculate mouse coordinates
        if(e.pageX||e.pageY){
          posx=e.pageX;
          posy=e.pageY;
        }
        else if(e.clientX||e.clientY){
          posx=e.clientX;
          posy=e.clientY;
        }
        // assign attributes to pop-up DIV element and append it
        // to web document tree
        var div=document.getElementById('popup');
        if(!div){
        var div=document.createElement('div');
        div.setAttribute('id','popup');
        div.className='popupdiv';
        div.appendChild(document.createTextNode('This is a
sample content for pop-up DIV element.'));
        document.getElementsByTagName('body')[0].appendChild
(div);
        }
        // move pop-up DIV element
        div.style.top=posy+5+'px';
        div.style.left=posx+5+'px';
      }
      // remove pop-up DIV element
      function hidePopupDiv(){
        var div=document.getElementById('popup');
        if(!div){return};
        div.parentNode.removeChild(div);
      }
      // display pop-up DIV element when web page has
      // been loaded
      window.onload=function(){
        if(document.getElementById && document.createElement &&
document.createTextNode){
          var div=document.getElementById('container');
          if(!div){return};
          // display pop-up DIV element
         div.onmousemove=displayPopupDiv;
         // hide pop-up DIV element
         div.onmouseout=hidePopupDiv;
       }
     }
   </script>
</head>
<body>
    <h1>JavaScript-based Pop-up Div</h1>
    <div class="popupcontainer" id="container">
    <p>Content for containing DIV goes here...<br />
         Content for containing DIV goes here...<br />
       Content for containing DIV goes here...<br />
         Content for containing DIV goes here...<br />
       Content for containing DIV goes here...<br />
       Content for containing DIV goes here...<br />
       Content for containing DIV goes here...</p>
   </div>
</body>
</html>

All right, that’s all you need to have a fully-functional pop-up DIV, ready to include into any web document. In addition, you can download a ZIP file (included at the beginning of this article) that contains a working example that includes the limitations that I outlined in a previous section. I hope you find this script useful! (link to pop_up_div.zip goes here).

Final thoughts

In the first part of the series, I showed you how to create a simple pop-up DIV, which admittedly includes some limitations, since it won’t be displayed by Internet Explorer when the web page is scrolled down.

Nevertheless, this bug will be fixed in the next article, in addition to expanding the initial script to work with multiple pop-up DIVs. This is really interesting, thus don’t miss the next tutorial!

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