jquery image upload proportional preview plug-in collection_jquery

The js part is like this:

Copy code The code is as follows:

//**** ******************Picture upload preview plug-in************************
/ /Author: IDDQD(2009-07-01)
//Email: iddqd5376@163.com
//http://blog.sina.com.cn/iddqd
//Version: 1.0

//Description: Image upload preview plug-in
//When uploading, it can generate proportional scaling images within a fixed width and height range

//Parameter settings:
//width The width of the fixed-size container for storing images
//height The height of the fixed-size container for storing images
//imgDiv The JQuery id of the page DIV
//imgType array suffix name
//**** ******************Image upload preview plug-in************************
(function($) {
jQuery.fn.extend({
uploadPreview: function(opts) {
opts = jQuery.extend({
width: 0,
height: 0,
imgDiv: "#imgDiv",
imgType: ["gif", "jpeg", "jpg", "bmp", "png"],
callback: function() { return false; }
}, opts || {});
var _self = this;
var _this = $(this);
var imgDiv = $(opts.imgDiv);
imgDiv.width (opts.width);
imgDiv.height(opts.height);

autoScaling = function() {
if ($.browser.version == "7.0" || $.browser .version == "8.0") imgDiv.get(0).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "image";
var img_width = imgDiv.width();
var img_height = imgDiv.height();
if (img_width > 0 && img_height > 0) {
var rate = (opts.width / img_width < opts.height / img_height) ? opts.width / img_width : opts.height / img_height;
if (rate <= 1) {
if ($.browser.version == "7.0" || $.browser.version == "8.0") imgDiv.get (0).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "scale";
imgDiv.width(img_width * rate);
imgDiv.height(img_height * rate);
} else {
imgDiv.width(img_width);
imgDiv.height(img_height);
}
var left = (opts.width - imgDiv.width()) * 0.5;
var top = (opts.height - imgDiv.height()) * 0.5;
imgDiv.css({ "margin-left": left, "margin-top": top });
imgDiv.show( );
}
}
_this.change(function() {
if (this.value) {
if (!RegExp(".(" opts.imgType.join(" |") ")$", "i").test(this.value.toLowerCase())) {
alert("The image type must be one of " opts.imgType.join(", ") " kind");
this.value = "";
return false;
}
imgDiv.hide();
if ($.browser.msie) {
if ( $.browser.version == "6.0") {
var img = $("");
imgDiv.replaceWith(img);
imgDiv = img;

var image = new Image();
image.src = 'file:///' this.value;

imgDiv.attr('src', image.src);
autoScaling();
}
else {
imgDiv.css({ filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image)" });
imgDiv.get(0) .filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "image";
try {
imgDiv.get(0).filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = this.value;
} catch (e) {
alert("Invalid image file! ");
return;
}
setTimeout("autoScaling()", 100);

}
}
else {
var img = $( "");
imgDiv.replaceWith(img);
imgDiv = img;
imgDiv.attr('src', this.files.item(0).getAsDataURL() );
imgDiv.css({ "vertical-align": "middle" });
setTimeout("autoScaling()", 100);
}
}
});
}
});
})(jQuery);

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