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https://gitee.com/coder-xiaomo/flashsale
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71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
/**
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* file-input.js
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* target container must be id "preview"
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*/
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function previewImage(file,className,id)
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{
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var MAXWIDTH,MAXHEIGHT;
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var div = $('#'+id).get(0);
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if(className==='preview-long'){
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MAXWIDTH = 200;
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MAXHEIGHT = 356;
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}
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else if(className==='preview-short'){
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MAXWIDTH = 200;
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MAXHEIGHT = 300;
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}
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else{
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MAXWIDTH = 120;
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MAXHEIGHT = 120;
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}
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if (file.files && file.files[0])
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{
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div.innerHTML = '<img class=imghead>';
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var img = $('#'+id).find('.imghead').get(0);
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img.onload = function(){
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var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
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img.width = rect.width;
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img.height = rect.height;
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img.style.marginLeft = rect.left+'px';
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img.style.marginTop = rect.top+'px';
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}
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var reader = new FileReader();
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reader.onload = function(evt){img.src = evt.target.result;}
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reader.readAsDataURL(file.files[0]);
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}
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else
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{
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var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
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file.select();
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var src = document.selection.createRange().text;
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div.innerHTML = '<img class=imghead>';
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var img = $('#'+id).find('.imghead').get(0);
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img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
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var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
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status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
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div.innerHTML = "<div id=divhead style='width:"+rect.width+"px;height:"+rect.height+"px;margin-top:"+rect.top+"px;margin-left:"+rect.left+"px;"+sFilter+src+"\"'></div>";
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}
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$('.file').attr('name','image');
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}
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function clacImgZoomParam( maxWidth, maxHeight, width, height ){
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var param = {top:0, left:0, width:width, height:height};
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if( width>maxWidth || height>maxHeight )
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{
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rateWidth = width / maxWidth;
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rateHeight = height / maxHeight;
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if( rateWidth > rateHeight )
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{
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param.width = maxWidth;
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param.height = Math.round(height / rateWidth);
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}else
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{
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param.width = Math.round(width / rateHeight);
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param.height = maxHeight;
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}
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}
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param.left = Math.round((maxWidth - param.width) / 2);
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param.top = Math.round((maxHeight - param.height) / 2);
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return param;
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} |