Prevent double click in submit-button when postback from other controls executed before button click

Question

I got a problem in preventing double click of Submit button in ASP.NET . I can disable the submit-button in pages which don't have ASP.NET Calendar . In pages which have this Calendar , calendar's postback disables the submit-button before the button is clicked.

I used the following javascript to disable the button in button-click. It works if there is no postback from other asp.net-controls before the submit-button is clicked.

function DisableButton() {
    document.getElementById("<%=ibtnNext.ClientID %>").disabled = true;
}
window.onbeforeunload = DisableButton;

i don't know what to do. All suggestions are welcome.

Answer 1

Instead of using the window.onbeforeunload event. Disable the button on its OnClientClick event.

The button's postBack(onClick event) will get executed only after the OnClientClick event in javascript.

<button id="ibtnNext" OnClientClick="return DisableButton()" onclick="btnSubmit_Click">Copy Text</button>

<script>
function DisableButton() 
{
     document.getElementById("<%=ibtnNext.ClientID %>").disabled = true;

     return true;
}
</script>

Answer 2

Thanks all, i got solution now as the following

javascript <script type="text/javascript"> function DisableButton(btn){ btn.disabled = true; } </script> <script type="text/javascript"> function DisableButton(btn){ btn.disabled = true; } </script>

in page load

protected sub Page_load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
    Dim optionsSubmit As New PostBackOptions(ibtnNext)
    ibtnNext.OnClientClick = "DisableButton(this);"
    ibtnNext.OnClientClick += ClientScript.GetPostBackEventReference(optionsSubmit) End Sub

in click event

Protected Sub ibtnNext_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Handles ibtnNext.Click
    System.Threading.Thread.Sleep(2000) End Sub

original link http://www.devtoolshed.com/content/disable-button-submit-prevent-multiple-submits