I recently answered this question on StackOverflow asking how to prevent someone from clicking a link multiple times.

This is the solution I came up with:

$("a").click(function(e) {
    e.preventDefault();

    if (!$(this).data('isClicked')) {
        var link = $(this);

        // Your code on successful click

        // Set the isClicked value and set a timer to reset in 3s
        link.data('isClicked', true);
        setTimeout(function() {
        link.removeData('isClicked')
        }, 3000);
    } else {
        // Anything you want to say 'Bad user!'
    }
});

You can use jQuery’s data storage methods to assign arbitrary bits of data to specific DOM elements. In this case, when the user clicks a link I assign a property to the element as well as setting a timer to remove it 3 seconds later. This lets me know if the specific element has already been clicked by just calling the data method.

It’s not a bullet proof solution since it’s incredibly easy to get around if you’re determined enough. However, it is a simple example of how you can use those methods.