How to embed your Ext JS 4 applications to run inside a div on an external app/website.

Posted on in Questions

Here's a prototype. In this example, the div has style="height:50%; width:50%".
I extended Ext.Container and added a very similar logic that we provide in our Viewport.

IMO it would be better to modify our Viewport class directly. We should also add resizing listeners on the node itself (like if a method changes the width from 400 to 500px). I only needed to add listeners for window resize, since that affect the width of the div with a % scale.

My recommendation is to support renderTo for the Viewport class, so that you can just put in the id of the DOM node as a config.

Ext.define('MyApp.view.ViewportContainer', {
    extend : 'Ext.container.Container',
    alias  : 'widget.viewport',

    initComponent : function() {
        var me   = this,
            el   = me.el = Ext.get(me.renderTarget),
            html = el.dom.parentNode;

        // Get the DOM disruption over with before the Viewport renders and begins a layout

        // Clear any dimensions, we will size later on
        me.width = me.height = undefined;

        me.callParent(arguments); + 'viewport');

        if (me.autoScroll) {
            delete me.autoScroll;

        el.setHeight = el.setWidth = Ext.emptyFn;
        el.dom.scroll = 'no';
        me.allowDomMove = false;
        me.renderTo = me.el;

    onRender: function() {
        var me       = this,
            parentCt = me.el.dom.parentNode;


        me.width  = parentCt.clientWidth;
        me.height = parentCt.clientHeight;

    afterFirstLayout: function() {
        var me = this;

        setTimeout(function() {
            //Ext.EventManager.onWindowResize(me.fireResize, me);
            Ext.EventManager.onWindowResize(function() {
                var parentCt = me.el.dom.parentNode;
                me.fireResize(parentCt.clientWidth, parentCt.clientHeight);
            }, me);
        }, 1);

    fireResize : function(width, height) {
        // In IE we can get resize events that have our current size, so we ignore them
        // to avoid the useless layout...
        if (width != this.width || height != this.height) {
            this.setSize(width, height);