At first I thought you were pulling a Friday funny on me.
But I do see your point, having properly read your post now.
I think, in our case, the web form is a very long way away from the database,
and after submission we go through a few human workflow steps involving
assessing and validating the submissions before it gets anywhere near our DB,
so I might just stick with JavaScript for the moment. Double-submission is more
of an annoyance than a peril in our situation.
Here's what I've gone with (because I lurve C# and hate JavaScript)
btnSubmit.Attributes.Add("onclick", "this.disabled=true;");
in the form OnLoad.
Dylan.
________________________________
From: [email protected] [mailto:[email protected]] On
Behalf Of David Connors
Sent: Friday, 30 July 2010 8:44 AM
To: ozDotNet
Subject: Re: ASP.NET 101 - How to prevent double-clicking on a submit button?
On 30 July 2010 08:37, Dylan Tusler
<[email protected]<mailto:[email protected]>>
wrote:
We've got an Ajax-ified multi-page form and I want to prevent double-clicking
on the final page's Submit button. My first thought is just to disable the
button in its on_Click event handler. Is this a suitable approach?
No. It might give you a perfunctory guard against a double-submission in the UI
layer but, with the web being what it is, you cannot guarantee it won't be
submitted twice.
I've looked around a little, trying to see what is the best approach to prevent
someone from clicking twice (or more) on a submit button, but there seems to be
a wide variety of methods to choose from, many involving JavaScript, or css,
and so on. None of them seem simple enough to risk experimenting with.
The approach we always apply is:
1. Create a table in your DB, two columns, one being called DoubleSubmitGuard
(GUID) and the other being DateTimeSubmittedUTC (Date/time).
2. At the time you generate the form, roll a new GUID, put it in that table,
and also embed it in the form.
3. As a part of the form submission process, check that DateTimeSubmittedUTC
is null, then do your normal work, and at the end of the transaction set the
DateTimeSubmittedUTC to mark the form as submitted.
4. Optionally you can display something to the user along the lines of "This
form has already been submitted" if they click submit twice.
Also disable the submit button as well if you want to improve the user
experience, but I would not be using the disabling of UI elements to
effectively implement the integrity if your database.
David.
--
David Connors | [email protected]<mailto:[email protected]> |
www.codify.com<http://www.codify.com>
Software Engineer
Codify Pty Ltd
Phone: +61 (7) 3210 6268 | Facsimile: +61 (7) 3210 6269 | Mobile: +61 417 189
363
V-Card: https://www.codify.com/cards/davidconnors
Address Info: https://www.codify.com/contact
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