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Ajax content appears in HTML DIV then disapear right away for no reason?

Posted on 2009-07-01
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Last Modified: 2013-11-18
Hello,

I have a simple Ajax script that retrieves the content of a file via URL and displays it in a <div> element. Nothing fancy except for the fact that the content retrieved appears at first and then magically disappear right after?

Since this is a rather simple example here is all the code, I am left wondering after surfing probably too many web sites and PDF documents.

Some help would be welcome, thanks!
CODE FOR HTML PAGE:
 
<html>
    <head>
        <script type="text/javascript" language="JavaScript" src="scripts/bridge_locale.js"></script>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Test</title>
    </head>
    <body>
        <form>
            <input type="submit" value="pull data" onclick="callAHAH('http://localhost/test.txt', 'displaydiv', 'blablabla...');" />
        </form>
        <div id="displaydiv"></div>
    </body>
</html>
 
 
CODE FOR JAVASCRIPT FILE:
 
function callAHAH(url, pageElement, callMessage) {
    //document.getElementById(pageElement).innerHTML = callMessage;
    try {
        req = new XMLHttpRequest(); //FF
    } catch (e) {
        //alert("XMLHttpRequest did not instantiate");
        try {
            req = new ActiveXObject("Msxml2.XMLHTTP"); //IE most common
        } catch(e) {
            //alert("Msxml2.XMLHTTP did not instantiate");
            try {
                req = new ActiveXObject("Microsoft.XMLHTTP"); //IE less common
            } catch (e) {
                //alert("Microsoft.XMLHTTP did not instantiate");
                req = false;
                //alert("Error: could not instantiate required control in bridge script");
            }
        }
    }
 
    req.onreadystatechange = function() { responseAHAH(pageElement); };
    req.open("GET", url, true);
    req.send(null);
}
 
function responseAHAH(pageElement) {
    alert("req.readyState="+req.readyState);
    alert("req.status="+req.status);
    var output = '';
    if (req.readyState == 4) {
        if (req.status == 200) {
            output = req.responseText;
            document.getElementById(pageElement).appendChild(document.createTextNode(output));
            alert("wait a minute before disapearing...???!!!");
        }
    }
}

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Question by:deve-lopez
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4 Comments
 
LVL 41

Assisted Solution

by:HonorGod
HonorGod earned 250 total points
ID: 24759933
How many alert( "req.readyState=4") and alert('req.status=200") messages do you get?
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Accepted Solution

by:
deve-lopez earned 0 total points
ID: 24760190
I actually found the solution... it was right under my eyes :-)
In the html code I changed the type of the input control from "submit" to "button":

<input type="submit" value="pull data" onclick="callAHAH...
INTO
<input type="button" value="pull data" onclick="callAHAH...

Now it works the data remain on the page and do not disappear anymore.
Taking a break away from the computer was the actual solution :-)
0
 
LVL 5

Expert Comment

by:Opalelement
ID: 24760934
When you click submit, it tries sending the form data to the server. It wasn't that the content was disappearing, it was that you were essentially "refreshing" the page each time;)
0
 
LVL 41

Expert Comment

by:HonorGod
ID: 24785694
Thanks for the assist and the point.

Thank you more so for providing your solution.

Good luck & have a great day.
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