On 25-05-2009 at 12:13, Michael Day wrote:
> I would like to prevent optimistic locking exceptions when a user
> double-clicks a link or double-submits a form. Is there anything
> wrong with accomplishing this by synchronizing the HTTP session in my
> ActionBean as shown below?
>
> public Resolution execute() {
> synchronized (getContext().getRequest().getSession()) {
> ...
> }
> }
Double-clicking would not cause a problem, as it's still a single action.
However, it is possible that a users is just a tad too slow to double-click:
the browser then sees it as two single-clicks, and submits the form twice.
Personally, I've solved this with a bit of javascript in the onsubmit
attribute of the form, and a bit of page-wide javascript (it can be made
form-specific):
var alreadySybmitted = false;
function maySubmit()
{
var result = !alreadySybmitted;
alreadySybmitted = true;
return result;
}
<stripes:form ... onsubmit="return maySubmit();">
...
</stripes:form>
>
>
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Register Now for Creativity and Technology (CaT), June 3rd, NYC. CaT
is a gathering of tech-side developers & brand creativity professionals. Meet
the minds behind Google Creative Lab, Visual Complexity, Processing, &
iPhoneDevCamp asthey present alongside digital heavyweights like Barbarian
Group, R/GA, & Big Spaceship. http://www.creativitycat.com
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