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912 B
2 lines
912 B
/*! Echo v1.5.0 | (c) 2014 @toddmotto | MIT license | github.com/toddmotto/echo */ |
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window.Echo=function(a,b){"use strict";var c,d,e,f=[],g=function(a){var d=a.getBoundingClientRect();return(d.top>=0&&d.left>=0&&d.top)<=(window.innerHeight||b.documentElement.clientHeight)+c},h=function(){var c=f.length;if(c>0)for(var d=0;c>d;d++){var h=f[d];h&&g(h)&&(h.src=h.getAttribute("data-echo"),f.splice(d,1),c=f.length,d--)}else b.removeEventListener?a.removeEventListener("scroll",i):a.detachEvent("onscroll",i),clearTimeout(e)},i=function(){clearTimeout(e),e=setTimeout(h,d)},j=function(e){var g=b.querySelectorAll("[data-echo]"),j=e||{};c=parseInt(j.offset||0),d=parseInt(j.throttle||250);for(var k=0;k<g.length;k++)f.push(g[k]);h(),b.addEventListener?(a.addEventListener("scroll",i,!1),a.addEventListener("load",i,!1)):(a.attachEvent("onscroll",i),a.attachEvent("onload",i))};return{init:j,render:h}}(this,document); |