SharePoint Online 2013 - Clear the "Send an email invitation" checkbox when adding permissions

Hi,

I've created an app that uses javascript injection to clear the Send an email invitation checkbox in the permissions dialog.

Here is the code that I used in the JS file:

function JavaScript_Embed() {

    loadScript(jQuery, function () {
        $(document).ready(function () {
            if (IsOnPage("aclinv.aspx")) {
                //Uncheck the send mail checkbox
                $("[id$='chkSendEmailv15']").prop("checked", false);
            }
        });
    });
}

function IsOnPage(pageName) {
    if (window.location.href.toLowerCase().indexOf(pageName.toLowerCase()) > -1) {
        return true;
    } else {
        return false;
    }
}

function loadScript(url, callback) {
    var head = document.getElementsByTagName("head")[0];
    var script = document.createElement("script");
    script.src = url;

    // Attach handlers for all browsers
    var done = false;
    script.onload = script.onreadystatechange = function () {
        if (!done && (!this.readyState
					|| this.readyState == "loaded"
					|| this.readyState == "complete")) {
            done = true;

            // Continue your code
            callback();

            // Handle memory leak in IE
            script.onload = script.onreadystatechange = null;
            head.removeChild(script);
        }
    };

    head.appendChild(script);
}

But from two weeks ago this stop working.

Any idea why and how this could be achieved?

Thanks,

Shady