js部分是這樣的:
代碼如下:
//**********************圖片上傳預覽插件************************
//作者：IDDQD(2009-07-01)
//Email：
[email protected] //http://blog.sina.com.cn/iddqd
//版本：1.0
//說明：圖片上傳預覽插件
//上傳的時候可以生成固定寬高范圍內的等比例縮放圖
//參數設置：
//width 存放圖片固定大小容器的寬
//height 存放圖片固定大小容器的高
//imgDiv 頁面DIV的JQuery的id
//imgType 數組後綴名
//**********************圖片上傳預覽插件*************************
(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("圖片類型必須是" + opts.imgType.join("，") + "中的一種");
this.value = "";
return false;
}
imgDiv.hide();
if ($.browser.msie) {
if ($.browser.version == "6.0") {
var img = $("<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("無效的圖片文件！");
return;
}
setTimeout("autoScaling()", 100);
}
}
else {
var img = $("<img />");
imgDiv.replaceWith(img);
imgDiv = img;
imgDiv.attr('src', this.files.item(0).getAsDataURL());
imgDiv.css({ "vertical-align": "middle" });
setTimeout("autoScaling()", 100);
}
}
});
}
});
})(jQuery);
頁面部分:
代碼如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<meta content="" name="Keywords" />
<meta content="" name="Description" />
<meta content="text/html;charset=utf-8" http-equiv="Content-Type" />
<script type="text/javascript" src="js/jquery.pack.js"></script>
<script type="text/javascript" src="js/uploadPreview/jquery.uploadPreview.js"></script>
<script type="text/javascript">
$(document).ready(function() {
//建議在#imgDiv的父元素上加個overflow:hidden;的css樣式
$("input").uploadPreview({ width: 200, height: 200, imgDiv: "#imgDiv", imgType: ["bmp", "gif", "png", "jpg"] });
});
</script>
</head>
<body>
<form id="form1" runat="server">
<input type="file" />
<br />
<div style="width: 200px; height: 200px; overflow: hidden; border: 1px solid red;">
<div id="imgDiv">
</div>
</div>
</form>
</body>
</html>