Question

So I’ve got this button:

<asp:Button runat="server" ID="btnSubmit" meta:resourcekey="btnSubmit" CausesValidation="true" OnClick="btnSubmit_Click" />

meta:resourcekey is for Localization Resources, doesn’t concern us here – as we can see it has got an OnClick-Method and causes Validation.

That works fine, too, but I’d like to disable that button after the user clicked it so he/she can’t click it multiple times before the PostBack succeeds, so here’s what I did in Page_Load:

btnSubmit.Attributes.Add("onclick", "this.disabled=true;" +
        Page.ClientScript.GetPostBackEventReference(btnSubmit, "").ToString());

onclick I’m disabling the button and re-adding the PostBackReference necessary for the OnClick-Method.

Problem: CausesValidation is gone, sadface. How exactly would I re-add that in CodeBehind or alternatively – What’s an entirely different solution to this?

My Button has to:

a) disable itself after clicking, yet be enabled after the postback
b) have an OnClick CodeBehind Method
c) cause Validation

Thanks,

Dennis

Answer 1

Just override the Onload event of ur page or master page with

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
   // prevents form from being submitted multiple times in MOST cases
   // programatic client-side calls to __doPostBack() can bypass this
    Page.ClientScript.RegisterOnSubmitStatement(GetType(), "ServerForm",
    "if (this.submitted) return false; this.submitted = true; return true;");
}