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prevent double postback RSS

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Last post Apr 07, 2008 07:41 AM by Hua-Jun Li - MSFT

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afrika

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887 Posts

prevent double postback

Apr 02, 2008 09:54 AM|LINK

Hello,

How do i prevent a form from being submitted twice ? Or more times, when submitted

In classic ASP i used to use a javascript disable button. But now, being new to .net I wonder if there are any methods preventing a double postback.

(This way i can have full control of what is being submitted)

thanks

Ehi
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Rajganesh

Participant

1117 Points

188 Posts
Re: prevent double postback

Apr 02, 2008 11:05 AM|LINK
Hi,

You can use the javascript ot disable the button as shown below.
```
<asp:Button ID="btnSubmit" runat="server" OnClientClick="Disable(this)" Text="Submit" OnClick="btnSubmit_Click" />
```
And in the javascript
```
function Disable(Obj)
        {
            Obj.disabled = true;
        }
```
Rajganesh
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afrika

Member

249 Points

887 Posts

Re: prevent double postback

Apr 02, 2008 11:13 AM|LINK

Thanks Rajganesh,

But you are not reading my post properly. I know about the javascript disable button. But am wondering if there are other ways.

Because i noticed if you do refresh the page, after submitting. It posts it twice.

Are there anyways in .net of guarding against submitting it twice ?

Thanks
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Rajganesh

Participant

1117 Points

188 Posts

Re: prevent double postback

Apr 02, 2008 11:26 AM|LINK

There is no default function available in .NET to detect the page refresh. But the below given link has an article which shows one of the way to achieve it. just check it.

http://www.dotnetspider.com/kb/Article4466.aspx

Rajganesh
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If this post answers your question please mark it as Answered.
- Edited by Hua-Jun Li - MSFT on Apr 07, 2008 07:16 AM
- Edited by Hua-Jun Li - MSFT on Apr 07, 2008 07:44 AM
- Marked as answer by Hua-Jun Li - MSFT on Apr 08, 2008 07:31 AM
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Hua-Jun Li -...

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75950 Points

5608 Posts

Re: prevent double postback

Apr 07, 2008 07:41 AM|LINK

Hi afrika,

Pease try the following method.

<asp:Button ID="Button1" runat="server" Height="38px" Text="Button" Width="143px" OnClick="Button1_Click" BorderStyle="Inset" />

Then you can add the code at Pgae_load to prevent the submit twince or more.

    protected void Page_Load(object sender, EventArgs e)
    {

     Button1.Attributes.Add("onclick", "this.disabled=false;"+this.GetPostBackEventReference(Button1));

}

Let me know if I have misunderstood what you mean.
Thanks.
Hope it helps,
Hua Jun

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- Marked as answer by Hua-Jun Li - MSFT on Apr 08, 2008 07:31 AM