Iframe placeholders, security and resizing

components/dom_distiller/core/javascript/dom_distiller_viewer.js

Index: components/dom_distiller/core/javascript/dom_distiller_viewer.js
diff --git a/components/dom_distiller/core/javascript/dom_distiller_viewer.js b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
index 55f53bbf3854feaebdf305bed92df2acce7a9ef2..548222f2913b11d523d991de33875ff8f1da7591 100644
--- a/components/dom_distiller/core/javascript/dom_distiller_viewer.js
+++ b/components/dom_distiller/core/javascript/dom_distiller_viewer.js
@@ -6,6 +6,41 @@ function addToPage(html) {
   var div = document.createElement('div');
   div.innerHTML = html;
   document.getElementById('content').appendChild(div);
+  fillYouTubePlaceholders();
+}
+
+function resizeIframes() {
+  iframeList = document.getElementsByTagName('iframe');
+  for (var i = 0; i < iframeList.length; i++) {
+    var ratio = iframeList[i].clientHeight / iframeList[i].clientWidth;
+    iframeList[i].width = iframeList[i].parentElement.clientWidth;
+    iframeList[i].height = iframeList[i].parentElement.clientWidth * ratio;
+  }
+}
+
+function fillYouTubePlaceholders() {
+  var placeholders = document.getElementsByClassName("embed-placeholder");
+  for (var i = 0; i < placeholders.length; i++) {
+    if (!placeholders[i].hasAttribute('data-type') ||
+        placeholders[i].getAttribute('data-type') != 'youtube' ||
+        !placeholders[i].hasAttribute('data-id')) {
+      continue;
+    }
+    var embed = document.createElement('iframe');
+    var url = 'http://www.youtube.com/embed/' +
+        placeholders[i].getAttribute('data-id');
+    embed.setAttribute('src', url);
+    embed.setAttribute('type', 'text/html');
+    embed.setAttribute('frameborder', '0');
+
+    var parent = placeholders[i].parentElement;
+    var width = parent.clientWidth;
+    var hdMult = 1080.0 / 1920.0; // YouTube frame width/height is always HD.
+    embed.setAttribute('width', width);
+    embed.setAttribute('height', width * hdMult);
+
+    parent.replaceChild(embed, placeholders[i]);
+  }
 }
 
 function showLoadingIndicator(isLastPage) {
@@ -74,3 +109,16 @@ document.getElementById('showOriginal').addEventListener('click', function(e) {
   document.body.appendChild(img);
 }, true);
 
+window.addEventListener('orientationchange', function(e) {
+  // Wait for the page to have actually updated before resizing.
+  setTimeout(resizeIframes, 150);
+});
+
+window.addEventListener('resize', function(e) {
+  setTimeout(resizeIframes, 150);

[cjhopman, 2015/03/12 02:39:22]

How about using an approach like
http://flwebsites.biz/posts/proportional-responsive-iframes-youtube-videos for
this?

[mdjones, 2015/03/14 02:04:44]

Done.

+});
+
+window.addEventListener('load', function(e) {
+  fillYouTubePlaceholders();
+});
+