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Why AJAX content won't display with document.getElementByID().style.display in IE8?

Hi All,

I'm seeing a strange issue with my code below. The content received thru the xmlHttpRequest, is not being displayed in IE8, after clicking the link. It is displayed only after moving the mouse/cursor, after clicking the link. Anyone sees what could be the problem here ? Please help.

Expand|Select|Wrap|Line Numbers
  1. <html>
  2. <head>
  3. <script type="text/javascript">
  5.    var xmlHttpfunction;
  6.    function ShowHint(id)
  7.    {
  8.       xmlHttp = GetXmlHttpObject();
  10.       if (xmlHttp == null)
  11.       {
  12.          alert ("Browser does not support HTTP Request");
  13.          return;
  14.       }
  16.       var url = "myurl.php";
  17.       url = url+"?id="+id;
  18.       xmlHttp.onreadystatechange = stateChanged;
  19.       xmlHttp.open("GET",url,true);
  20.       xmlHttp.send(null);
  21.    }
  23.    function stateChanged()
  24.    {
  25.       if (xmlHttp.readyState === 4)
  26.       {
  27.          document.getElementById("elementRight").style.display = "block";
  28.          document.getElementById("elementRight").innerHTML = xmlHttp.responseText;
  29.       }
  30.    }
  32. </script>
  33. </head>
  34. <body>
  35.       <div id="elementLeft">
  36.          <ul >
  37.             <li>
  38.                <a href="#" onclick="ShowHint("1");"> Item1 </a>
  39.             </li>
  40.             <li>
  41.                <a href="#" onclick="ShowHint("2");"> Item1 </a>
  42.             </li>
  43.             <li>
  44.                <a href="#" onclick="ShowHint("3");"> Item1 </a>
  45.             </li>
  46.          </ul>
  47.       </div>
  48.       <div class="element" id="elementRight">
  49.       </div>
  50. </body>
  51. </html>
The css for 'element' is -
Expand|Select|Wrap|Line Numbers
  1. .element {
  2.         overflow:hidden;
  3.         border:1px;
  4.         border:#7CAFBE solid 1px;
  5.         height:50%;
  6.         width:79%;
  7.         float:right;
  8.         padding:0 0 0 10px;
  9.         padding-left:1px;
  10.         z-index:1000;
  11.    }
Many Thanks,
Jan 24 '11 #1
3 2128
985 Expert 512MB

I am surprised that you're seeing anything at all, considering the apparent syntax errors in lines 38, 41, and 44, where you have apparently violated HTMLs quoting rules. For example:
Expand|Select|Wrap|Line Numbers
  1. <a href="#" onclick="ShowHint("1");"> Item1 </a>,
Should probably be:
Expand|Select|Wrap|Line Numbers
  1. <a href="#" onclick="ShowHint('1');"> Item1 </a>,
Nevertheless, since it is working, that is not the fundamental problem that you're encountering...

The second problem I see is that you aren't stopping the anchor link in your code snippet. You probably should add a return false; to each of the events, like this:
Expand|Select|Wrap|Line Numbers
  1. <a href="#" onclick="ShowHint('1'); return false;"> Item1 </a>,
Jan 24 '11 #2

Thanks for responding.

This was a typo, while copying the code -
Expand|Select|Wrap|Line Numbers
  1. <a href="#" onclick="ShowHint("1");"> Item1 </a>
Sorry about that.

I now have the following, as you suggested -
Expand|Select|Wrap|Line Numbers
  1. <a href="#" onclick="ShowHint('1');return false;">
  2.    Item1
  3. </a>
But, I still see the same result.

Actually, when I click on the link 'Item1', a dotted border around 'Item1' appears and only when I move the mouse arrow out of this dotted border, the content is loaded. Has this got anything to do with the anchor tag itself ? The following is the css for the anchor tag -

Expand|Select|Wrap|Line Numbers
  1. a {
  2.         color:#000000; 
  3.         text-decoration: none;
  4.         font-family: verdana;
  5.         font-size: 11px;
  6.         padding:0 0 0 10px; 
  7.         text-align: center;
  8.         cursor: pointer;
  9. }
Thanks Again,
Jan 25 '11 #3
985 Expert 512MB
You may be running into variable scoping rules with xmlHttp.

Try hoisting the onreadystatechange to an anonymous function, like this:
Expand|Select|Wrap|Line Numbers
  1.    function ShowHint(id) 
  2.    { 
  3.       xmlHttp = GetXmlHttpObject(); 
  5.       if (xmlHttp == null) 
  6.       { 
  7.          alert ("Browser does not support HTTP Request"); 
  8.          return; 
  9.       } 
  11.       var url = "myurl.php"; 
  12.       url = url+"?id="+id; 
  13.       xmlHttp.onreadystatechange =
  14.         function(){
  15.           if (xmlHttp.readyState == 4) 
  16.           { 
  17.             document.getElementById("elementRight").style.display = "block"; 
  18.             document.getElementById("elementRight").innerHTML = xmlHttp.responseText; 
  19.           } 
  20.         }
  21.       xmlHttp.open("GET",url,true); 
  22.       xmlHttp.send(null); 
  23.    } 
Also, I changed the state comparison from absolute equality (===) to simple equality (==).

Jan 25 '11 #4

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