Sharepoint - App Part iFrame width to 100%

I just had this issue the other day (but with height). The key is to use postMessage to set the width of the iframe. This worked for me (put in the .aspx file of app):

<body>
<div id="dynamicContent">
//App content here
</div>


<script type="text/javascript">
    "use strict";
    window.Communica = window.Communica || {};

    $(document).ready(function () {
        Communica.Part.init();
    });

    Communica.Part = {
        senderId: '',

        init: function () {
            var params = document.URL.split("?")[1].split("&");
            for (var i = 0; i < params.length; i = i + 1) {
                var param = params[i].split("=");
                if (param[0].toLowerCase() == "senderid")
                    this.senderId = decodeURIComponent(param[1]);
            }


            this.adjustSize();
        },

        adjustSize: function () {
            var step = 30,
                newHeight,
                contentHeight = $('#userDataContent').height(),
                resizeMessage = '<message senderId={Sender_ID}>resize({Width}, {Height})</message>';

            newHeight = (step - (contentHeight % step)) + contentHeight;

            resizeMessage = resizeMessage.replace("{Sender_ID}", this.senderId);
            resizeMessage = resizeMessage.replace("{Height}", newHeight);
            resizeMessage = resizeMessage.replace("{Width}", "100%");

            window.parent.postMessage(resizeMessage, "*");
        }
    };
</script>
</body>

Replace #userDataContent with your main div id name

Here is where I found the information (as you can see my script is almost identical): http://ctp-ms.blogspot.com/2013/03/resizing-app-parts-with-postmessage-in.html

Sharepoint - App Part iFrame width to 100%

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