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efrain |
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// H5P iframe Resizer
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(function () {
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if (!window.postMessage || !window.addEventListener || window.h5pResizerInitialized) {
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return; // Not supported
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}
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window.h5pResizerInitialized = true;
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// Map actions to handlers
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var actionHandlers = {};
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/**
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* Prepare iframe resize.
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*
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* @private
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* @param {Object} iframe Element
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* @param {Object} data Payload
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* @param {Function} respond Send a response to the iframe
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*/
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actionHandlers.hello = function (iframe, data, respond) {
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// Make iframe responsive
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iframe.style.width = '100%';
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// Bugfix for Chrome: Force update of iframe width. If this is not done the
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// document size may not be updated before the content resizes.
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iframe.getBoundingClientRect();
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// Tell iframe that it needs to resize when our window resizes
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var resize = function () {
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if (iframe.contentWindow) {
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// Limit resize calls to avoid flickering
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respond('resize');
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}
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else {
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// Frame is gone, unregister.
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window.removeEventListener('resize', resize);
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}
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};
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window.addEventListener('resize', resize, false);
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// Respond to let the iframe know we can resize it
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respond('hello');
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};
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/**
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* Prepare iframe resize.
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*
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* @private
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* @param {Object} iframe Element
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* @param {Object} data Payload
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* @param {Function} respond Send a response to the iframe
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*/
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actionHandlers.prepareResize = function (iframe, data, respond) {
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// Do not resize unless page and scrolling differs
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if (iframe.clientHeight !== data.scrollHeight ||
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data.scrollHeight !== data.clientHeight) {
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// Reset iframe height, in case content has shrinked.
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iframe.style.height = data.clientHeight + 'px';
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respond('resizePrepared');
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}
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};
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/**
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* Resize parent and iframe to desired height.
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*
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* @private
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* @param {Object} iframe Element
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* @param {Object} data Payload
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* @param {Function} respond Send a response to the iframe
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*/
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actionHandlers.resize = function (iframe, data) {
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// Resize iframe so all content is visible. Use scrollHeight to make sure we get everything
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iframe.style.height = data.scrollHeight + 'px';
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};
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/**
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* Keyup event handler. Exits full screen on escape.
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*
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* @param {Event} event
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*/
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var escape = function (event) {
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if (event.keyCode === 27) {
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exitFullScreen();
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}
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};
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// Listen for messages from iframes
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window.addEventListener('message', function receiveMessage(event) {
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if (event.data.context !== 'h5p') {
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return; // Only handle h5p requests.
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}
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// Find out who sent the message
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var iframe, iframes = document.getElementsByTagName('iframe');
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for (var i = 0; i < iframes.length; i++) {
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if (iframes[i].contentWindow === event.source) {
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iframe = iframes[i];
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break;
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}
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}
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if (!iframe) {
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return; // Cannot find sender
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}
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// Find action handler handler
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if (actionHandlers[event.data.action]) {
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actionHandlers[event.data.action](iframe, event.data, function respond(action, data) {
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if (data === undefined) {
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data = {};
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}
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data.action = action;
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data.context = 'h5p';
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event.source.postMessage(data, event.origin);
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});
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}
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}, false);
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// Let h5p iframes know we're ready!
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var iframes = document.getElementsByTagName('iframe');
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var ready = {
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context: 'h5p',
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action: 'ready'
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};
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for (var i = 0; i < iframes.length; i++) {
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if (iframes[i].src.indexOf('h5p') !== -1) {
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iframes[i].contentWindow.postMessage(ready, '*');
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}
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}
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})();
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