Stop RadWindow postback after javascript event

[Gary]

I have a radwindow in which I have a button execute some javascript which manipulates the css classes of some elements. I see that this works, but then the content posts back and refreshes and the changes that the javascript just made get wiped out. How can I stop the radwindow from reloading after I execute a javascript function?

Here is the code for the button on the page loaded in the RadWindow:

<div style="padding:10px 10px 10px 10px; position:fixed; background-color:white; width:100%; z-index:100; height:15px;">
    <table>
             <tr>
                <td>
                    <button id="btnModify" onclick="ShowModify(); return false;">Modify</button>
                </td>
             </tr>
  </table>
</div>

And here's the javascript I have in the RadWindow:

function ShowModify()
{
        var elems = document.getElementsByTagName("span");
        for (i in elems)
        {
             if (elems[i].className == "modifyField")
             {
                  elems[i].className = "modifyFieldVisible";
             }
         }
         return false;
}

[Marin Bratanov]

Hi Gary,

Does this work when placed directly on the page outside of a RadWIndow? I am asking because RadWindow does not modify its content, so it cannot generate a postback by itself. The most likely reason I can see for the behavior you describe is a JS error in the custom code that you are using. It is also entirely possible that something else on the page is causing the postback, e.g. a timer.


Regards,
Marin Bratanov
Telerik

[Gary]

Marin,
Good suggestion! I did exactly that and found that it was a javascript exception that was thrown that was causing the page to postback.

Thanks!