From ad3f33f03a874fc80e318dc20e312f538e603045 Mon Sep 17 00:00:00 2001
From: Teoh Han Hui <teohhanhui@gmail.com>
Date: Wed, 2 Apr 2014 11:15:50 +0000
Subject: [PATCH] Kill zombies

---
 dist/echo.js     | 21 ++++++++++++++++++++-
 dist/echo.min.js |  2 +-
 src/echo.js      | 21 ++++++++++++++++++++-
 3 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/dist/echo.js b/dist/echo.js
index 4a1edd1..c5e3087 100644
--- a/dist/echo.js
+++ b/dist/echo.js
@@ -20,6 +20,25 @@ window.Echo = (function (global, document, undefined) {
    */
   var offset, throttle, poll;
 
+  /**
+   * _contains
+   * @private
+   * @param {Node} parent Parent node
+   * @param {Node} descendant Descendant node
+   * @returns {Boolean} Does parent contain descendant
+   */
+  var _contains = !!document.compareDocumentPosition ?
+  // IE
+  function (parent, descendant) {
+    return parent.contains(descendant);
+  } :
+  // Everyone else
+  function (parent, descendant) {
+    /*jslint bitwise: true */
+    return parent.compareDocumentPosition(descendant) & 16;
+    /*jslint bitwise: false */
+  };
+
   /**
    *  _inView
    * @private
@@ -41,7 +60,7 @@ window.Echo = (function (global, document, undefined) {
     if (length > 0) {
       for (var i = 0; i < length; i++) {
         var self = store[i];
-        if (self && _inView(self)) {
+        if (self && _contains(document.documentElement, self) && _inView(self)) {
           self.src = self.getAttribute('data-echo');
           callback(self);
           store.splice(i, 1);
diff --git a/dist/echo.min.js b/dist/echo.min.js
index b24d32e..e8928cc 100644
--- a/dist/echo.min.js
+++ b/dist/echo.min.js
@@ -1,2 +1,2 @@
 /*! Echo v1.5.0 | (c) 2014 @toddmotto | MIT license | github.com/toddmotto/echo */
-window.Echo=function(a,b){"use strict";var c,d,e,f=[],g=function(){},h=function(a){var d=a.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(window.innerHeight||b.documentElement.clientHeight)+c},i=function(){var c=f.length;if(c>0)for(var d=0;c>d;d++){var i=f[d];i&&h(i)&&(i.src=i.getAttribute("data-echo"),g(i),f.splice(d,1),c=f.length,d--)}else b.removeEventListener?a.removeEventListener("scroll",j):a.detachEvent("onscroll",j),clearTimeout(e)},j=function(){clearTimeout(e),e=setTimeout(i,d)},k=function(e){var h=b.querySelectorAll("[data-echo]"),k=e||{};c=parseInt(k.offset||0),d=parseInt(k.throttle||250),g=k.callback||g;for(var l=0;l<h.length;l++)f.push(h[l]);i(),b.addEventListener?(a.addEventListener("scroll",j,!1),a.addEventListener("load",j,!1)):(a.attachEvent("onscroll",j),a.attachEvent("onload",j))};return{init:k,render:i}}(this,document);
\ No newline at end of file
+window.Echo=function(a,b){"use strict";var c,d,e,f=[],g=function(){},h=b.compareDocumentPosition?function(a,b){return a.contains(b)}:function(a,b){return 16&a.compareDocumentPosition(b)},i=function(a){var d=a.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(window.innerHeight||b.documentElement.clientHeight)+c},j=function(){var c=f.length;if(c>0)for(var d=0;c>d;d++){var j=f[d];j&&h(b.documentElement,j)&&i(j)&&(j.src=j.getAttribute("data-echo"),g(j),f.splice(d,1),c=f.length,d--)}else b.removeEventListener?a.removeEventListener("scroll",k):a.detachEvent("onscroll",k),clearTimeout(e)},k=function(){clearTimeout(e),e=setTimeout(j,d)},l=function(e){var h=b.querySelectorAll("[data-echo]"),i=e||{};c=parseInt(i.offset||0),d=parseInt(i.throttle||250),g=i.callback||g;for(var l=0;l<h.length;l++)f.push(h[l]);j(),b.addEventListener?(a.addEventListener("scroll",k,!1),a.addEventListener("load",k,!1)):(a.attachEvent("onscroll",k),a.attachEvent("onload",k))};return{init:l,render:j}}(this,document);
\ No newline at end of file
diff --git a/src/echo.js b/src/echo.js
index ce86a45..a2d1cb0 100644
--- a/src/echo.js
+++ b/src/echo.js
@@ -19,6 +19,25 @@ window.Echo = (function (global, document, undefined) {
    */
   var offset, throttle, poll;
 
+  /**
+   * _contains
+   * @private
+   * @param {Node} parent Parent node
+   * @param {Node} descendant Descendant node
+   * @returns {Boolean} Does parent contain descendant
+   */
+  var _contains = !!document.compareDocumentPosition ?
+  // IE
+  function (parent, descendant) {
+    return parent.contains(descendant);
+  } :
+  // Everyone else
+  function (parent, descendant) {
+    /*jslint bitwise: true */
+    return parent.compareDocumentPosition(descendant) & 16;
+    /*jslint bitwise: false */
+  };
+
   /**
    *  _inView
    * @private
@@ -40,7 +59,7 @@ window.Echo = (function (global, document, undefined) {
     if (length > 0) {
       for (var i = 0; i < length; i++) {
         var self = store[i];
-        if (self && _inView(self)) {
+        if (self && _contains(document.documentElement, self) && _inView(self)) {
           self.src = self.getAttribute('data-echo');
           callback(self);
           store.splice(i, 1);