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February 16, 2016 23:05
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Simple jquery based pre-loader
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$(document).ready(function () { | |
"use strict" | |
//indexOf is not supported by IE9>. | |
if (!Array.prototype.indexOf){ | |
Array.prototype.indexOf = function(elt /*, from*/){ | |
var len = this.length >>> 0; | |
var from = Number(arguments[1]) || 0; | |
from = (from < 0) | |
? Math.ceil(from) | |
: Math.floor(from); | |
if (from < 0) | |
from += len; | |
for (; from < len; from++){ | |
if (from in this && | |
this[from] === elt) | |
return from; | |
} | |
return -1; | |
}; | |
} | |
var bgImg = [], img = [], count=0, percentage = 0; | |
//Creating loader overlay | |
$('<div id="loaderMask"><span>0%</span></div>').css({ | |
position:"fixed", | |
top:0, | |
bottom:0, | |
left:0, | |
right:0, | |
background:'#fff' | |
}).appendTo('body'); | |
//Searching all elemnts in the page for image | |
$('*').filter(function() { | |
var val = $(this).css('background-image').replace(/url\(/g,'').replace(/\)/,'').replace(/"/g,''); | |
var imgVal = $(this).not('script').attr('src'); | |
if(val !== 'none' && !/linear-gradient/g.test(val) && bgImg.indexOf(val) === -1){ | |
bgImg.push(val) | |
} | |
if(imgVal !== undefined && img.indexOf(imgVal) === -1){ | |
img.push(imgVal) | |
} | |
}); | |
var imgArray = bgImg.concat(img); | |
$.each(imgArray, function(i,val){ //Adding load and error event | |
$("<img />").attr("src", val).bind("load", function () { | |
completeImageLoading(); | |
}); | |
$("<img />").attr("src", val).bind("error", function () { | |
imgError(this); | |
}); | |
}) | |
function completeImageLoading(){ | |
count++; | |
percentage = Math.floor(count / imgArray.length * 100); | |
$('#loaderMask').html('<span>'+percentage + '%'+'</span>'); | |
if(percentage === 100){ | |
$('#loaderMask').html('<span>100%</span>') | |
$('#loaderMask').fadeOut(function(){ | |
$('#loaderMask').remove() | |
}) | |
} | |
} | |
//Error handling | |
function imgError (arg) { | |
$('#loaderMask').html("Image failed to load.. Loader quitting..").delay(3000).fadeOut(1000, function(){ | |
$('#loaderMask').remove(); | |
}) | |
} | |
}); |
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