Preventing multiple form submits in ASP.NET

Question

I'm currently searching for a way to prevent multiple form submits in ASP.NET (i.e. the user clicks on a submitbutton several times, causing the OnClick-Event to fire several times also).

Currently, I'm doing it like this:

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        Page.ClientScript.RegisterOnSubmitStatement(GetType(), "ServerForm",
        "if (this.submitted) return false; this.submitted = true; return true;");
    }

This works like a charm for synchronous postbacks - the 'submitted'-value will be reset after each postback and prevent the form from being submitted multiple times in the same run - however, this method does not work for AsyncPostbacks i.e. with an UpdatePanel, so now I'm searching for an idea to make this happen without having to dis- and enable each and every button via JS after clicking a button.

Thanks,

Dennis

Because it's an awful lot of JS that I really don't want in my pages, additionally it has to work for several Browsers (hi IE), which really can be a pain to implement, I was hoping to find a simple solution such as this that I can just implement in a class deriving from Page. — Dennis Röttger, Mar 09 '12 at 10:39

score 4 · Accepted Answer · answered Mar 09 '12 at 10:42

4

You can use Page.get_isInAsyncPostBack() in javascript to check the state of async request.

Refer this link for more information: http://ranaictiu-technicalblog.blogspot.com/2009/03/prevent-concurrent-asynchronous.html

answered Mar 09 '12 at 10:42

Hoa Tran

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score 1 · Answer 2 · edited May 23 '17 at 11:58

1

why not you check in your database ? if the user already registerd then give a alert box. and you can also check PRG pattern

Handling Form submission with PRG

edited May 23 '17 at 11:58

Community

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answered Mar 09 '12 at 10:46

Ravi Gadag

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score 0 · Answer 3 · answered Mar 09 '12 at 10:48

0

Hopes this will help you.

http://www.techimo.com/forum/webmastering-programming/210441-prevent-multiple-postbacks-javascript-net.html

answered Mar 09 '12 at 10:48

PraveenVenu

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Welcome to Stack Overflow! While this may theoretically answer the question, [it would be preferable](http://meta.stackexchange.com/q/8259) to include the essential parts of the answer here, and provide the link for reference. – Bill the Lizard Mar 09 '12 at 12:11

score 0 · Answer 4 · answered Mar 09 '12 at 13:50

You can check the start & end methods present in classSys.WebForms.PageRequestManager to check for ASync requests.
Sys.WebForms.PageRequestManager You can modify the code in above example & disable the button by using simple javascript like

document.getElementById("YouButton.ClientID").disabled = true;

Preventing multiple form submits in ASP.NET

4 Answers4