Detect click inside iframe (same domain/sub domain) in Chrome using jQuery

Question

This question has been asked a lot, and the answers are usually similar.

In basic terms, I need a function to perform when the contents of an iframe are clicked.

Answer 1

If you just want to make links in the iframe open in the top window instead of inside of the iframe check out How to force link from iframe to be opened in the parent window

Just put this in the head of the iframe HTML:

<base target="_parent" />

Answer 2

Here is an example I've put together on jsFiddle that demonstrates one way to use XDM: This is the demo and it includes this fiddle as a child iframe

HTML (parent):

<h1>Parent window</h1>
<input id="message-for-child" type="text" value="" placeholder="(message for child)">
<button id="parent-to-child-button">Send to child</button>
<br>
<p id="parent-message"></p>
<br>
<iframe id="child" src="http://fiddle.jshell.net/quant/G2uq6/show/"></iframe>

JavaScript (parent):

// parent_on_message(e) will handle the reception of postMessages (a.k.a. cross-document messaging or XDM).
function parent_on_message(e) {
    console.log("parent_on_message event fired: ", e);
    // You really should check origin for security reasons
    // https://developer.mozilla.org/en-US/docs/DOM/window.postMessage#Security_concerns
    if (e.origin.search(/^http[s]?:\/\/.*\.jshell\.net/) != -1
        && !($.browser.msie && $.browser.version <= 7)) {
        var returned_pair = e.data.split('=');
        if (returned_pair.length != 2)
            return;
        if (returned_pair[0] === 'message-for-parent') {
            $("p#parent-message").html(returned_pair[1]);
        }
        else
            console.log("Parent received invalid message");
    }
}

jQuery(document).ready(function($) {
    // Setup XDM listener (except for IE < 8)
    if (!($.browser.msie && $.browser.version <= 7)) {
        // Connect the parent_on_message(e) handler function to the receive postMessage event
        if (window.addEventListener)
            window.addEventListener("message", parent_on_message, false);
        else
            window.attachEvent("onmessage", parent_on_message);
    }


    $("button#parent-to-child-button").on("click", function(e) {
        console.log("Sending: " + $("input#message-for-child").attr("value"));
        $("iframe#child").get(0).contentWindow.postMessage('message-for-child=' + $("input#message-for-child").attr("value"), '*');
        
    });

        
});

HTML (child):

<h1>Child</h1>
<input id="message-for-parent" type="text" value="" placeholder="(message for parent)">
<button id="child-to-parent-button">Send to parent</button>
<br>
<p id="child-message"></p>

JavaScript (child):

// child_on_message(e) will handle the reception of postMessages (a.k.a. cross-document messaging or XDM).
function child_on_message(e) {
    console.log("child_on_message event fired: ", e);
    // You really should check origin for security reasons
    // https://developer.mozilla.org/en-US/docs/DOM/window.postMessage#Security_concerns
    if (e.origin.search(/^http[s]?:\/\/.*\.jshell\.net/) != -1
        && !($.browser.msie && $.browser.version <= 7)) {
        var returned_pair = e.data.split('=');
        if (returned_pair.length != 2)
            return;
        if (returned_pair[0] === 'message-for-child') {
            $("p#child-message").html(returned_pair[1]);
        }
        else
            console.log("Child received invalid message");
    }
}

jQuery(document).ready(function($) {
    // Setup XDM listener (except for IE < 8)
    if (!($.browser.msie && $.browser.version <= 7)) {
        // Connect the child_on_message (e) handler function to the receive postMessage event
        if (window.addEventListener)
            window.addEventListener("message", child_on_message , false);
        else
            window.attachEvent("onmessage", child_on_message );
    }


    $("button#child-to-parent-button").on("click", function(e) {
        console.log("Sending: " + $("input#message-for-parent").attr("value"));
        parent.window.postMessage('message-for-parent=' + $("input#message-for-parent").attr("value"), '*');
        
    });

        
});

Further reading:

• XDM tutorial
• XDM info
• XDM security #1
• XDM security #2