Disabling Submit Button

[Fishcake]

I'd like to disable a submit button to prevent mutiple database entries.
I've not had a problem disabling the button using Javascript but the method i used seems to intercept the postback and so the normal code is never executed. I found out i had to manually post the form, with this the form is submitted and page_load runs but i still can't get the button_onclick event to run after the button is disabled. code.....

'In code behind
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    If Not IsPostBack Then
        btnSubmit.Attributes.Add("onclick", "return disableMe(this);")
    End If
End Sub
 
Sub btnSubmit_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnSubmit.Click
    'Fairly long process here
End Sub
 
'In Script in .aspx file
        <script language="javascript">
            function disableMe(btn) {
                btn.disabled = true;
                document.form1.submit();
                return true;
            }
        </script>

I've found quite a few examples on the web but couldn't get any of them to work.

any ideas?

[Fishcake]

anyone? I'd really like to get this working if at all possible.

[nemaroller]

So you just want to disable a Submit button after it has been pressed (sent back to the server)?

Then in your code behind, just set the SubmitButton.Enabled property to false in your click_event.

Then you don't need the javascript.

But, as far as the Javascript, instead of

 document.form.submit

you have to something like this

__dopostback('x');

I forget what x is though.. I think its the id of the control that raised the postback event.

[Fishcake]

The problem with setting enabled = false is that until the code behind the button has finished the user can keep clicking on the button over and over until the page is rendered again with the button disabled.

Cheers, i'll look at calling _dopostback instead of submiting th form.

Thanks.

[nemaroller]

Just found this:

http://msdn.microsoft.com/library/de...ementTopic.asp


http://weblogs.asp.net/vga/archive/2...InWhidbey.aspx

[Fishcake]

Thanks for those links, just what i wanted.

[Fishcake]

Finally got this working exactly as i wanted. Stops a button begin reclicked until processing from the first instance has finished. This code also works when there are validators on the page. Here's the code incase it's useful to anyone else.

Dim sb As New System.Text.StringBuilder
        sb.Append("if (typeof(Page_ClientValidate) == 'function') { ")
        sb.Append("if (Page_ClientValidate() == false) { return false; }} ")
        sb.Append("this.value = 'Please wait...';")
        sb.Append("this.disabled = true;")
        sb.Append(GetPostBackEventReference(btnSubmit))
        sb.Append(";")
 
        If Not IsPostBack Then
            btnSubmit.Attributes.Add("onclick", sb.ToString())
        End If