Issue with __doPostBack method failing to render on subsequent postback

I'm encountering a peculiar issue.

After using GetPostBackEventRefence to trigger a Postback, it initially works fine. However, after the first postback, the .NET function fails to render... any suggestions?

This is what seems to be missing after the postback:

<script language="javascript" type="text/javascript">
<!--
function __doPostBack(eventTarget, eventArgument) {
    var theform;
    if (window.navigator.appName.toLowerCase().indexOf("microsoft") > -1) {
        theform = document.Main;
    }
    else {
        theform = document.forms["Main"];
    }
    theform.__EVENTTARGET.value = eventTarget.split("$").join(":");
    theform.__EVENTARGUMENT.value = eventArgument;
    theform.submit();
}
// -->
</script>
asp.netjavascriptpostback

Answer №1

After considering that concept, I decided to create a dummy function using the postbackreference, and surprisingly it worked... although it still seems odd since it only renders correctly the first time

this.Page.RegisterClientScriptBlock("DUMMY", "<script language='javascript'>function dummy() { " + this.Page.GetPostBackEventReference(this) + "; } </script>");

Answer №2

Check for any ASP controls on the page that may require a postback, such as linkbuttons or comboboxes. The __doPostback function will only be added to the page if ASP detects the need for it.

If you are not using these controls, you can manually add the function with the following code:

Page.ClientScript.GetPostBackClientHyperlink(controlName, "")

This will ensure the function is included on your page as needed.

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