Question

I need to know how to prevent users from submit the form multiple times and disable the submit button after it’s clicked in ASP.NET. Is it possible to add a loading animation after the button is disabled? I tried OnClientClick event to disable button but cancel the OnClick event that the page just post back without any changes. Any clue?

Answer 1

Try this:

protected void Page_Load(object sender, EventArgs e)
{            
    Page.ClientScript.RegisterOnSubmitStatement(GetType(), "ServerForm",
        "if(this.submitted) return false; this.submitted = true;");
    button.Attributes.Add("onclick", string.Format("this.value='wait...';
        this.disabled=true; {0}", ClientScript.GetPostBackEventReference
        (button, string.Empty)));
}