asp.net server-side events can intermittently fail to trigger due to conflicts with JavaScript

I am facing what initially seemed like a simple javascript issue, but now I am becoming frustrated trying to solve it.

The problem I encountered was with a slow-loading page where users could click the submit button and then another button while waiting for the page to load, causing complications. To address this, I attempted to display a "please wait" message and disable the submit button upon click. Below is the function I am using. Since I am working with asp.net 3.5, there is a name mangling issue, so I am using getElementByName and scanning for the appropriate items (not ideal, but it seems to function). However, when I execute this function, the button becomes disabled, but the server is not called. I checked in Firefox and did not see any errors in Firebug, but when I set a breakpoint on the server, it was evident that the server was not being called. I even tried returning true in case there was expected output, but it did not help. When I commented out the content of 'processing(){ // stuff }', the page worked fine, so something in that function is causing the issue.

function processing() {
    var pleaseWaitID = "lblPleaseWait";
    var submitBtnName = "btnSubmit";
    var submitControl = document.getElementsByTagName('input');

    var pleaseWaitlbls = document.getElementsByName(pleaseWaitID);

    for (pleaseWait in pleaseWaitlbls) {
       if (pleaseWaitlbls[pleaseWait].style != null) {
            pleaseWaitlbls[pleaseWait].style.visibility="visible";
       }
    }

    for (submitButton in submitControl) {
       if (submitControl[submitButton].name != null) {
           if (submitControl[submitButton].name.search(submitBtnName) != -1) {
               submitControl[submitButton].disabled = "disabled";
           }
       }
    }

    return true;
}

.....

 asp:Button ID="btnSubmit" name="btnSubmit" SkinID="MainAction" runat="server" Text="Submit" OnClientClick = "javascript:processing();"
 OnClick="btnSubmit_Click" meta:resourcekey="btnSubmitResource1"

Any suggestions on what could be going wrong here?

Thank you for your attention.

Answer №1

Dealing with Multiple Clicks on an Asp.net Custom User Control Button

I encountered a similar issue and found a potential solution that may be of use to you.

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