Disable Submit button in case of multiple click.. (C#)

Question

My Problem is ,I have a simple web form, which contains two textboxes and a button.there are some asp.net validator controls on page.so i want client side disabling of button when all validation is done.and also after disabling of button, i am executing some server side code.All of this is working fine but, in case when I set postback url of button it gets fail. bellow is some part of coding that will give you some brief idea. Any hint will be highly appreciated.......

I wanted to make this functionality in composite control. here is button class

public class MyButton : Button
{

    protected override void OnPreRender(EventArgs e)
    {
        if (this.CausesValidation)
        {
            if (!String.IsNullOrEmpty(this.ValidationGroup))
            {
                this.Attributes.Add("onclick", @"javascript:

             if (typeof(Page_ClientValidate) == 'function')
                 {
                    if (Page_ClientValidate('" + this.ValidationGroup + "')){" + this.ClientID + ".disabled=true;" + Page.GetPostBackEventReference(this) +

              "}else{return;}}  else{" + this.ClientID + ".disabled=true;" + Page.GetPostBackEventReference(this) + "}");
            }

            else
            {
                this.Attributes.Add("onclick", @"javascript:

                 if (typeof(Page_ClientValidate) == 'function')
                   {
                      if (Page_ClientValidate()){" + this.ClientID + ".disabled=true;" + Page.GetPostBackEventReference(this) +
                  "}else{return;}}  else{" + this.ClientID + ".disabled=true;" + Page.GetPostBackEventReference(this) + "}");
            }
        }
        else
            this.Attributes.Add("onclick", "javascript:" + this.ClientID + ".disabled=true;" + Page.GetPostBackEventReference(this));

        base.OnPreRender(e);
    }

Answer 1

This is the correct and simple way to do this:

Create a helper method in your application (say in a Utlity Namespace):

    Public Shared Sub PreventMultipleClicks(ByRef button As System.Web.UI.WebControls.Button)
        button.Attributes.Add("onclick", "this.disabled=true;" & button.Page.ClientScript.GetPostBackEventReference(button, String.Empty).ToString)
    End Sub

Now from the code behind of each of your web pages you can simply call:

    Utility.PreventMultipleClicks(button1)

where button1 is the the button you want to prevent multiple clicks.

What this does is simply sets the on click handler to: this.disabled=true

and then appends the buttons own post back handler, so we get:

onclick="this.disabled=true";__doPostBack('ID$ID','');"

This does not break the default behaviour of the page and works in all browsers as expected.

Enjoy!