How to prevent form from submitting multiple times from client side?

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Use unobtrusive javascript to disable the submit event on the form after it has already been submitted. Here is an example using jQuery.

EDIT: Fixed issue with submitting a form without clicking the submit button. Thanks, ichiban.

$("body").on("submit", "form", function() {
    $(this).submit(function() {
        return false;
    });
    return true;
});

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