forked from spen/seminar
137 lines
4.0 KiB
JavaScript
137 lines
4.0 KiB
JavaScript
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/* ===================================================
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* jquery-lite-image-resize v.1.0.1
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* https://github.com/RayChang/jquery-lite-image-resize
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* ===================================================
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* How to use ?
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*
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* HTML element closest to the image to add class "resizeimg".
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*
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* Example:
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* <div class="resizeimg">
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* <img src="images url" />
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* </div>
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*
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* Or you can use:
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* $('your class').rsImg();
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*
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* Note : HTML structure must be a structure like the example above.
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*
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*/
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!function ($) {
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"use strict";
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var ResizeImg = function(element, elementLength, i) {
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this.element = $(element);
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this.element.data('exists', true);
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this.elementLength = elementLength;
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this.index = i;
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};
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ResizeImg.prototype.resize = function(callback) {
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var $img = this.element.children('img').eq(0),
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elW = this.element.innerWidth(),
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elH = this.element.innerHeight(),
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elScale = elW/elH,
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ell = this.elementLength,
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index = this.index,
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image = document.createElement("img");
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image.src = $img.attr('src');
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this.element.css({
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'position': 'relative',
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'overflow': 'hidden',
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});
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function imageLoadComplete() {
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var imgW = image.width,
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imgH = image.height,
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imgScale = imgW/imgH,
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portrait = {
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'position': 'absolute',
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'height': '100%',
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'width': 'auto',
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'max-width': 'none',
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'left': '50%',
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'top': 0,
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'margin-left': imgW*(elH/imgH)/-2
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},
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landscape = {
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'position': 'absolute',
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'height': 'auto',
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'max-height': 'none',
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'width': '100%',
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'left': 0,
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'top': '50%',
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'margin-top': imgH*(elW/imgW)/-2
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},
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center = {
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'position': 'absolute',
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'height': '100%',
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'width': '100%',
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'top': 0,
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'left': 0
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};
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if(imgScale < 1) {
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if(elScale < 1) {
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if(elScale > imgScale) {
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$img.css(landscape);
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} else {
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$img.css(portrait);
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};
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} else {
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$img.css(landscape);
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};
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};
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if(imgScale > 1) {
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if(elScale > 1) {
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if(elScale > imgScale) {
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$img.css(landscape);
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} else {
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$img.css(portrait);
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};
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} else {
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$img.css(portrait);
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};
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};
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if(imgScale == 1) {
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if(elScale < 1) {
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$img.css(portrait);
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} else if(elScale > 1) {
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$img.css(landscape);
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} else {
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$img.css(center);
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};
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};
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$img.fadeTo(500, 1);
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if(index == ell && callback) {
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ResizeImg.prototype.callback(callback)
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}
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}
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if(/MSIE 8.0/g.test($ua)) {
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imageLoadComplete();
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} else {
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image.onload = imageLoadComplete;
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}
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};
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ResizeImg.prototype.callback = function(callback) {
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callback();
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};
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$.fn.rsImg = function (callback) {
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var elementLength = this.length - 1;
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this.each(function (i) {
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if(!$(this).data('exists')) {
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$(this).children("img").fadeTo(0,0);
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new ResizeImg(this, elementLength, i).resize(callback);
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};
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});
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};
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$(function() {
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$('.resizeimg').rsImg();
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});
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}(window.jQuery);
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