472065 - Firefox does a double postback

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect)

Description

[afrika]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5 (.NET CLR 3.5.30729)

Firefox does a double postback.

When i put a disable button in .net as

        string clickHandler = string.Format(
 "document.body.style.cursor = 'default'; this.value='Please wait... While we try to upload your numbers'; this.disabled = true; {0};",
 this.ClientScript.GetPostBackEventReference(Button1, string.Empty));

       Button1.Attributes.Add("onclick", clickHandler);

Reproducible: Sometimes

Steps to Reproduce:
1. click on submit
2. ff submits twice
3.
Actual Results:  
Firefox does a double postback
ff submits twice

Expected Results:  
ff should submit once

see discussed details here

http://forums.asp.net/t/1364753.aspx

Comment 1

[William Buchanan]

I have the same problem with the same disable script. I noticed the problem goes away when I remove the UpdatePanel from the page.

Comment 2

[William Buchanan]

I've noticed that the problem isn't linked to the disable script itself. It seems to be the GetPostBackEventReference which is causing the problem. I was able to repro the problem by using the following simple example:

// In the page aspx.cs file, apply the script to the button. Btn is the button I want to disable
ApplyDisableButtonScript(btn, Page, "Please Wait...");


// This method applies the script to buttons
public static void ApplyDisableButtonScript(Button btn, Page page, string disabledText)
{
 btn.Attributes.Add("onclick", "DisableClick(this, '" + disabledText + "');" +
  page.ClientScript.GetPostBackEventReference(btn, string.Empty) + ";");
}


// And this is the script... Notice how it is all commented out and the problem still occurs
function DisableClick(obj, disabledText)
{
    //if (typeof(Page_ClientValidate) == 'function') 
    //{ 
    //    if (Page_ClientValidate() == false) 
    //        return false; 
    //} 
    
    //if (disabledText != "")
    //    obj.value = disabledText;
    //obj.disabled = true;
}


So the problem seems to be a more fundamental one due to the way Firefox handles this...

Comment 3

[Carlos Martinez]

This is definitely a fundamental way in which Firefox handles this as all other browsers do a single postback.

If you add "return false;" to the end of the script, then a single postback will occur. This will work with all browsers.

Ex:

btnSubmit.Attributes.Add("onclick", ClientScript.GetPostBackEventReference(btnSubmit, "") + ";this.value='Processing...';this.disabled = true;return false;")