imageSwapper/imageSwapper.js at master · hillside-software/imageSwapper · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
function addLoadEvent(func) {
	var oldonload = window.onload;
	if (typeof window.onload != 'function') {
		window.onload = func;
	} else {
		window.onload = function() {
			oldonload();
			func();
		}
	}
}

addLoadEvent(bgSlide);

multiplier = 55; timeout = 8; timeout2 = 3000; count = 1;
function bgSlide(containerDiv,e,x,xi,io)
{
	var xc = e.style.backgroundPosition;
	xc = parseInt(xc.substring(0,xc.indexOf('p')));

	targetX = parseInt(xi) + parseInt(x);

	if(io == "o")
	{
		// we are easing out
		if(x < 0)
		{
			// we are moving negatively along the x-axis
			var deltaX = xi - xc;
			var percentMoved = (-1)*(deltaX/x);
			var posX = xc - Math.ceil((1.0-percentMoved) * multiplier);
			if(posX < targetX) { posX = targetX; }
		}
		else if(x == 0)
		{
			var posX = xc;
		}
		else
		{
			var deltaX = xc - xi;
			var percentMoved = (deltaX/x);
			var posX = xc + Math.ceil((1.0-percentMoved) * multiplier);
			if(posX > targetX) { posX = targetX; }
		}
	}
	else
	{
		// we are easing in
		if(x < 0)
		{
			// we are moving negatively along the x-axis
			var deltaX = xi - xc;
			var percentMoved = (-1)*(deltaX/x);
			var posX = xc - Math.ceil((percentMoved + .01) * multiplier);
			if(posX < targetX) { posX = targetX; }
		}
		else if(x==0)
		{
			var posX = xc;
		}
		else
		{
			var deltaX = xc - xi;
			var percentMoved = (deltaX/x);
			var posX = xc + Math.ceil((percentMoved + .01) * multiplier);
			if(posX > targetX) { posX = targetX; }
		}
	}

	e.style.backgroundPosition = posX+"px";
	e.style.opacity = percentMoved;

	if(posX == targetX)
	{
		e.style.opacity='1.0';
		var swapperDiv = document.getElementById(containerDiv);
		if(count == 0) var lastCount = imagesArray.length-1; else var lastCount = count-1;
		swapperDiv.style.backgroundImage="url('"+imagesArray[lastCount]+"')";
		swapperDiv.style.backgroundPosition="0px";

		if(!document.getElementById('theSwapper'))
		{
			var newDiv = document.createElement('div');
			newDiv.className="swapper";
			newDiv.id="theSwapper";
			newDiv.style.position="absolute";
			e.appendChild(newDiv);
		}
		else
		{
			var newDiv = document.getElementById('theSwapper');
		}
		var newImage = new Image();
		newImage.src = imagesArray[count];
		newDiv.style.backgroundImage="url('"+imagesArray[count]+"')";
		newDiv.style.backgroundPosition=xi+"px";
		newDiv.style.backgroundRepeat="no-repeat";
		if(count < imagesArray.length-1) { ++count; } else { count = 0; }
		timer = setTimeout(function() { bgSlide(newDiv,x,xi,io); }, timeout2);
	}
	else
	{
		timer = setTimeout(function() { bgSlide(e,x,xi,io); }, timeout);
	}
}

function imageSwapper(width)
{
	var allDivs = document.getElementsByTagName('div');
	for(var i=0; i < allDivs.length; ++i)
	{
		var divElement = allDivs[i];
		if(divElement.getAttribute('class') == "swapper")
		{
			var swapperDiv = divElement;
		}
	}

	swapperDiv.style.backgroundRepeat="no-repeat";

	// pre-load first image to get things tarted
	var newImage = new Image();
	newImage.src = imagesArray[0];

	// no assign it to the far right as the background image
	swapperDiv.style.backgroundImage="url('"+imagesArray[0]+"')";
	swapperDiv.style.backgroundPosition=width+"px";

	bgSlide("featSliderShortcode",swapperDiv,(-1*width),width,"o");
}