Clicking a disabled input or button

There is no way to capture a click on disabled elements. Your best bet is to react to a specific class on the element.

HTML Markup:

<input type="button" class="disabled" value="click" />

JavaScript code:

$('input').click(function (event) {
    if ($(this).hasClass('disabled')) {
        alert('CLICKED, BUT DISABLED!!');
    } else {
        alert('Not disabled. =)');
    }
});

You could then use CSS styling to simulate a disabled look:

.disabled
{
    background-color: #DDD;
    color: #999;
}

Here's a jsFiddle demonstrating its use.

Making the field readonly can help, because the click event will be fired. Though be aware of the differences in behaviour.

<input type="button" value="click" readonly="readonly" />