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Lets consider this classic problem on the web.

Most people are not aware about the difference between double click and single click on the internet. This creates a lot of programming issues for the back-end guy.

<form method=POST>
<input type="text" id="text-input">
<input type="submit" id="submit-button">
</form>

Here is a small jquery snippet which disables the submit button on form submission. The id of the submit button would be submit-button.

$('#submit-button').click(
function(){
$('#submit-button').attr('disabled', true);
$('#submit-button').closest("form").submit();
});

This code solves most of the common problems.

Lets consider the case where there is a jquery form validation also in place.

Here you will need to disable the button only on completely validated form. The code for that goes below

$('#submit-button').click(
function(){
if($('#submit-button').closest("form").validate().form()){
$('#submit-button').closest("form").submit();
$('#submit-button').attr('disabled', true);
}});

Let me know if you find more interesting techniques.