How to add click event to a iframe with JQuery

There's no 'onclick' event for an iframe, but you can try to catch the click event of the document in the iframe:

document.getElementById("iframe_id").contentWindow.document.body.onclick = 
function() {
  alert("iframe clicked");
}

EDIT Though this doesn't solve your cross site problem, FYI jQuery has been updated to play well with iFrames:

$('#iframe_id').on('click', function(event) { });

Update 1/2015 The link to the iframe explanation has been removed as it's no longer available.

Note The code above will not work if the iframe is from different domain than the host page. You can still try to use hacks mentioned in comments.

I was trying to find a better answer that was more standalone, so I started to think about how JQuery does events and custom events. Since click (from JQuery) is just any event, I thought that all I had to do was trigger the event given that the iframe's content has been clicked on. Thus, this was my solution

$(document).ready(function () {
    $("iframe").each(function () {
        //Using closures to capture each one
        var iframe = $(this);
        iframe.on("load", function () { //Make sure it is fully loaded
            iframe.contents().click(function (event) {
                iframe.trigger("click");
            });
        });

        iframe.click(function () {
            //Handle what you need it to do
        });
    });
});

Try using this : iframeTracker jQuery Plugin, like that :

jQuery(document).ready(function($){
    $('.iframe_wrap iframe').iframeTracker({
        blurCallback: function(){
            // Do something when iframe is clicked (like firing an XHR request)
        }
    });
});