Add option 'container' to support other containers than default window

README.md

@@ -99,6 +99,16 @@ echo.init({
   }
 });
 ```
+#### container
+Type: `Object` Default: `null`
+
+This allows you to specify a different container of the defaut 'document'.
+
+```js
+echo.init({
+  container: document.querySelector(".main")
+});
+```
 
 ## .render()
 

dist/echo.js

@@ -17,7 +17,7 @@
 
   var callback = function () {};
 
-  var offset, poll, delay, useDebounce, unload;
+  var offset, poll, delay, useDebounce, unload, container;
 
   var inView = function (element, view) {
     var box = element.getBoundingClientRect();
@@ -53,6 +53,7 @@
     useDebounce = opts.debounce !== false;
     unload = !!opts.unload;
     callback = opts.callback || callback;
+    container = opts.container || root;
     echo.render();
     if (document.addEventListener) {
       root.addEventListener('scroll', debounceOrThrottle, false);
@@ -70,8 +71,8 @@
     var view = {
       l: 0 - offset.l,
       t: 0 - offset.t,
-      b: (root.innerHeight || document.documentElement.clientHeight) + offset.b,
+      b: (container.innerHeight || container.clientHeight) + offset.b,
-      r: (root.innerWidth || document.documentElement.clientWidth) + offset.r
+      r: (container.innerWidth || container.clientWidth) + offset.r
     };
     for (var i = 0; i < length; i++) {
       elem = nodes[i];

dist/echo.min.js

@@ -1,2 +1,2 @@
 /*! echo.js v1.6.0 | (c) 2014 @toddmotto | https://github.com/toddmotto/echo */
-!function(t,e){"function"==typeof define&&define.amd?define(function(){return e(t)}):"object"==typeof exports?module.exports=e:t.echo=e(t)}(this,function(t){"use strict";var e,n,o,r,c,i={},l=function(){},a=function(t,e){var n=t.getBoundingClientRect();return n.right>=e.l&&n.bottom>=e.t&&n.left<=e.r&&n.top<=e.b},d=function(){(r||!n)&&(clearTimeout(n),n=setTimeout(function(){i.render(),n=null},o))};return i.init=function(n){n=n||{};var a=n.offset||0,u=n.offsetVertical||a,f=n.offsetHorizontal||a,s=function(t,e){return parseInt(t||e,10)};e={t:s(n.offsetTop,u),b:s(n.offsetBottom,u),l:s(n.offsetLeft,f),r:s(n.offsetRight,f)},o=s(n.throttle,250),r=n.debounce!==!1,c=!!n.unload,l=n.callback||l,i.render(),document.addEventListener?(t.addEventListener("scroll",d,!1),t.addEventListener("load",d,!1)):(t.attachEvent("onscroll",d),t.attachEvent("onload",d))},i.render=function(){for(var n,o,r=document.querySelectorAll("img[data-echo]"),d=r.length,u={l:0-e.l,t:0-e.t,b:(t.innerHeight||document.documentElement.clientHeight)+e.b,r:(t.innerWidth||document.documentElement.clientWidth)+e.r},f=0;d>f;f++)o=r[f],a(o,u)?(c&&o.setAttribute("data-echo-placeholder",o.src),o.src=o.getAttribute("data-echo"),c||o.removeAttribute("data-echo"),l(o,"load")):c&&(n=o.getAttribute("data-echo-placeholder"))&&(o.src=n,o.removeAttribute("data-echo-placeholder"),l(o,"unload"));d||i.detach()},i.detach=function(){document.removeEventListener?t.removeEventListener("scroll",d):t.detachEvent("onscroll",d),clearTimeout(n)},i});
+!function(t,e){"function"==typeof define&&define.amd?define(function(){return e(t)}):"object"==typeof exports?module.exports=e:t.echo=e(t)}(this,function(t){"use strict";var e,n,o,r,c,i,a={},l=function(){},d=function(t,e){var n=t.getBoundingClientRect();return n.right>=e.l&&n.bottom>=e.t&&n.left<=e.r&&n.top<=e.b},u=function(){(r||!n)&&(clearTimeout(n),n=setTimeout(function(){a.render(),n=null},o))};return a.init=function(n){n=n||{};var d=n.offset||0,f=n.offsetVertical||d,s=n.offsetHorizontal||d,h=function(t,e){return parseInt(t||e,10)};e={t:h(n.offsetTop,f),b:h(n.offsetBottom,f),l:h(n.offsetLeft,s),r:h(n.offsetRight,s)},o=h(n.throttle,250),r=n.debounce!==!1,c=!!n.unload,l=n.callback||l,i=n.container||t,a.render(),document.addEventListener?(t.addEventListener("scroll",u,!1),t.addEventListener("load",u,!1)):(t.attachEvent("onscroll",u),t.attachEvent("onload",u))},a.render=function(){for(var t,n,o=document.querySelectorAll("img[data-echo]"),r=o.length,u={l:0-e.l,t:0-e.t,b:(i.innerHeight||i.clientHeight)+e.b,r:(i.innerWidth||i.clientWidth)+e.r},f=0;r>f;f++)n=o[f],d(n,u)?(c&&n.setAttribute("data-echo-placeholder",n.src),n.src=n.getAttribute("data-echo"),c||n.removeAttribute("data-echo"),l(n,"load")):c&&(t=n.getAttribute("data-echo-placeholder"))&&(n.src=t,n.removeAttribute("data-echo-placeholder"),l(n,"unload"));r||a.detach()},a.detach=function(){document.removeEventListener?t.removeEventListener("scroll",u):t.detachEvent("onscroll",u),clearTimeout(n)},a});

package.json

@@ -6,15 +6,15 @@
   "license": "MIT",
   "homepage": "https://github.com/toddmotto/echo",
   "devDependencies": {
-    "gulp": "~3.7.0",
+    "gulp": "^3.8.7",
-    "gulp-uglify": "~0.3.0",
-    "gulp-rename": "~1.1.0",
     "gulp-clean": "^0.2.4",
-    "gulp-plumber": "~0.6.2",
     "gulp-header": "^1.0.2",
     "gulp-jshint": "^1.6.1",
-    "jshint-stylish": "^0.2.0",
     "gulp-karma": "0.0.4",
+    "gulp-plumber": "~0.6.2",
+    "gulp-rename": "~1.1.0",
+    "gulp-uglify": "~0.3.0",
+    "jshint-stylish": "^0.2.0",
     "karma": "^0.12.16",
     "karma-jasmine": "~0.2.0",
     "karma-phantomjs-launcher": "^0.1.4",

src/echo.js

@@ -16,7 +16,7 @@
 
   var callback = function () {};
 
-  var offset, poll, delay, useDebounce, unload;
+  var offset, poll, delay, useDebounce, unload, container;
 
   var inView = function (element, view) {
     var box = element.getBoundingClientRect();
@@ -52,6 +52,7 @@
     useDebounce = opts.debounce !== false;
     unload = !!opts.unload;
     callback = opts.callback || callback;
+    container = opts.container || root;
     echo.render();
     if (document.addEventListener) {
       root.addEventListener('scroll', debounceOrThrottle, false);
@@ -69,8 +70,8 @@
     var view = {
       l: 0 - offset.l,
       t: 0 - offset.t,
-      b: (root.innerHeight || document.documentElement.clientHeight) + offset.b,
+      b: (container.innerHeight || container.clientHeight) + offset.b,
-      r: (root.innerWidth || document.documentElement.clientWidth) + offset.r
+      r: (container.innerWidth || container.clientWidth) + offset.r
     };
     for (var i = 0; i < length; i++) {
       elem = nodes[i];