mirror of
https://gitee.com/coder-xiaomo/flashsale
synced 2025-01-11 20:28:20 +08:00
71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
|
/**
|
||
|
|
* file-input.js
|
||
|
|
* target container must be id "preview"
|
||
|
|
*/
|
||
|
|
function previewImage(file,className,id)
|
||
|
|
{
|
||
|
|
var MAXWIDTH,MAXHEIGHT;
|
||
|
|
var div = $('#'+id).get(0);
|
||
|
|
if(className==='preview-long'){
|
||
|
|
MAXWIDTH = 200;
|
||
|
|
MAXHEIGHT = 356;
|
||
|
|
}
|
||
|
|
else if(className==='preview-short'){
|
||
|
|
MAXWIDTH = 200;
|
||
|
|
MAXHEIGHT = 300;
|
||
|
|
}
|
||
|
|
else{
|
||
|
|
MAXWIDTH = 120;
|
||
|
|
MAXHEIGHT = 120;
|
||
|
|
}
|
||
|
|
if (file.files && file.files[0])
|
||
|
|
{
|
||
|
|
div.innerHTML = '<img class=imghead>';
|
||
|
|
var img = $('#'+id).find('.imghead').get(0);
|
||
|
|
img.onload = function(){
|
||
|
|
var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
|
||
|
|
img.width = rect.width;
|
||
|
|
img.height = rect.height;
|
||
|
|
img.style.marginLeft = rect.left+'px';
|
||
|
|
img.style.marginTop = rect.top+'px';
|
||
|
|
}
|
||
|
|
var reader = new FileReader();
|
||
|
|
reader.onload = function(evt){img.src = evt.target.result;}
|
||
|
|
reader.readAsDataURL(file.files[0]);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';
|
||
|
|
file.select();
|
||
|
|
var src = document.selection.createRange().text;
|
||
|
|
div.innerHTML = '<img class=imghead>';
|
||
|
|
var img = $('#'+id).find('.imghead').get(0);
|
||
|
|
img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;
|
||
|
|
var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);
|
||
|
|
status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height);
|
||
|
|
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>";
|
||
|
|
}
|
||
|
|
$('.file').attr('name','image');
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
function clacImgZoomParam( maxWidth, maxHeight, width, height ){
|
||
|
|
var param = {top:0, left:0, width:width, height:height};
|
||
|
|
if( width>maxWidth || height>maxHeight )
|
||
|
|
{
|
||
|
|
rateWidth = width / maxWidth;
|
||
|
|
rateHeight = height / maxHeight;
|
||
|
|
if( rateWidth > rateHeight )
|
||
|
|
{
|
||
|
|
param.width = maxWidth;
|
||
|
|
param.height = Math.round(height / rateWidth);
|
||
|
|
}else
|
||
|
|
{
|
||
|
|
param.width = Math.round(width / rateHeight);
|
||
|
|
param.height = maxHeight;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
param.left = Math.round((maxWidth - param.width) / 2);
|
||
|
|
param.top = Math.round((maxHeight - param.height) / 2);
|
||
|
|
return param;
|
||
|
|
}
|