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2 lines
1.5 KiB
/*! 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=[],h=[],i=function(){},j=function(a,b){var c=a.getBoundingClientRect();return c.right>=b.l&&c.bottom>=b.t&&c.left<=b.r&&c.top<=b.b},k=function(){var a,d,e,k,l=g.length;if(k={l:0-c.l,t:0-c.t,b:(window.innerHeight||b.documentElement.clientHeight)+c.b,r:(window.innerWidth||b.documentElement.clientWidth)+c.r},l>0)for(d=0;l>d;d++)e=g[d],e&&j(e,k)&&(f&&(e.setAttribute("data-echo-placeholder",e.src),h.push(e)),e.src=e.getAttribute("data-echo"),i(e,"load"),g.splice(d,1),l=g.length,d--);if(a=h.length,a>0)for(d=0;a>d;d++)e=h[d],e&&!j(e,k)&&(e.src=e.getAttribute("data-echo-placeholder"),i(e,"unload"),h.splice(d,1),a=h.length,d--,g.push(e));0===a&&0===l&&n()},l=function(){clearTimeout(e),e=setTimeout(k,d)},m=function(e){var j=b.querySelectorAll("img[data-echo]");e=e||{};var m=e.offset||0,n=e.offsetVertical||m,o=e.offsetHorizontal||m;c={t:parseInt(e.offsetBot||n),b:parseInt(e.offsetTop||n),l:parseInt(e.offsetLeft||o),r:parseInt(e.offsetRight||o)},d=parseInt(e.throttle||250),f=!!e.unload,i=e.callback||i,g=[],h=[];for(var p=0;p<j.length;p++)g.push(j[p]);k(),b.addEventListener?(a.addEventListener("scroll",l,!1),a.addEventListener("load",l,!1)):(a.attachEvent("onscroll",l),a.attachEvent("onload",l))},n=function(){b.removeEventListener?a.removeEventListener("scroll",l):a.detachEvent("onscroll",l),clearTimeout(e)};return{init:m,detach:n,render:k}}(this,document); |