https://www.4elementsmed.com/data/common/js/imageLoader.js

1function ImageLoader()
2{
3  this.TIMER_DURATION = 50;
4	this.image = null;
5	this.timer = null;
6 	this.onEndFunction = null;
7};
8 
9ImageLoader.prototype.TIMER_DURATION = 50;
10ImageLoader.prototype.image = null;
11ImageLoader.prototype.timer = null;
12ImageLoader.prototype.onEndFunction = null;
13
14ImageLoader.prototype.setOnEndFunction = function(onEndFunction)
15{
16  this.onEndFunction = onEndFunction;
17};
18
19ImageLoader.prototype.loadImage = function(source)
20{
21  if (this.timer != null)
22  {
23    clearTimeout(this.timer);
24  }
25  var _this = this;
26  this.image = new Image();
27  this.image.onerror = function()
28  {
29    clearTimeout(_this.timer);
30    if (_this.onEndFunction != null)
31    {
32      _this.onEndFunction.call(this, false, 0, 0);
33    }
34  };
35  this.image.src = source;
36  this.timer = setTimeout(function() { _this._waitLoad(); }, 10);
37};
38
39ImageLoader.prototype._waitLoad = function()
40{
41  if (this.image.complete)
42  {
43    if (this.onEndFunction != null)
44    {
45     var isLoaded = true;
46     var width = this.image.width;
47     var height = this.image.height;
48     if ((width <= 0) || (height <= 0))
49     {
50      isLoaded = false;
51      width = 0;
52      height = 0;
53     }
54     this.onEndFunction.call(this, isLoaded, width, height);
55    }
56  }
57  else
58  {
59    var _this = this;
60    this.timer = setTimeout(function() { _this._waitLoad(); }, this.TIMER_DURATION);
61  }
62};
63
64/*
65ImageLoader.prototype._onLoadError = function()
66{
67  clearTimeout(this.timer);
68  if (this.onEndFunction != null)
69  {
70     this.onEndFunction.call(this, false, 0, 0);
71  }
72};
73*/
74