jquery 图片本地预览
uploadPreview.js
/*
*名称:图片上传本地预览插件 v1.1
*介绍:基于JQUERY扩展,图片上传预览插件 目前兼容浏览器(IE 谷歌 火狐) 不支持safari
*参数说明: Img:图片ID;Width:预览宽度;Height:预览高度;ImgType:支持文件类型;Callback:选择文件显示图片后回调方法;
*使用方法:
<div>
<img id="ImgPr" width="120" height="120" /></div>
<input type="file" id="up" />
把需要进行预览的IMG标签外 套一个DIV 然后给上传控件ID给予uploadPreview事件
$("#up").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120, ImgType: ["gif", "jpeg", "jpg", "bmp", "png"], Callback: function () { }});
*/
jQuery.fn.extend({
uploadPreview: function (opts) {
var _self = this,
_this = $(this);
opts = jQuery.extend({
Img: "ImgPr",
Width: 100,
Height: 100,
ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
Callback: function () {}
}, opts || {});
_self.getObjectURL = function (file) {
var url = null;
if (window.createObjectURL != undefined) {
url = window.createObjectURL(file)
} else if (window.URL != undefined) {
url = window.URL.createObjectURL(file)
} else if (window.webkitURL != undefined) {
url = window.webkitURL.createObjectURL(file)
}
return url
};
_this.change(function () {
if (this.value) {
if (!RegExp("\.(" + opts.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
alert("选择文件错误,图片类型必须是" + opts.ImgType.join("，") + "中的一种");
this.value = "";
return false
}
if ($.browser.msie) {
try {
$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))
} catch (e) {
var src = "";
var obj = $("#" + opts.Img);
var div = obj.parent("div")[0];
_self.select();
if (top != self) {
window.parent.document.body.focus()
} else {
_self.blur()
}
src = document.selection.createRange().text;
document.selection.empty();
obj.hide();
obj.parent("div").css({
'filter': 'progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)',
'width': opts.Width + 'px',
'height': opts.Height + 'px'
});
div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src
}
} else {
$("#" + opts.Img).attr('src', _self.getObjectURL(this.files[0]))
}
opts.Callback()
}
})
}
});
jsp
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link rel="stylesheet" href="css/common.css">
<link rel="stylesheet" href="css/main.css">
<script type="text/javascript" src="js/jquery.min.js"></script>
<script src="js/uploadPreview.js" type="text/javascript"></script>
<style type="text/css">
.upimage{
padding: 6px 10px;
height: 35px;
line-height: 20px;
position: relative;
cursor: pointer;
color: #888;
background: #fafafa;
border: 1px solid #ddd;
border-radius: 4px;
overflow: hidden;
display: inline-block;
float: left;
margin-left: 10px;
margin-top: 39px;
}
</style>
function choose(){
$("#file").show().click();
$("#file").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120 });
}
</script>
</head>
<body>
<form action="${pageContext.request.contextPath}/update.do" enctype="multipart/form-data"
method="post">
<table>
<tr>
<td class="td_right">图片：</td>
<td class="">
<div style="float: left;width: 120px;">
<img id="ImgPr" src="${serverPath}/${zySubscription.imgurl}" width="120" height="120" />
</div>
<input type="button" value="上传图片" onclick="choose();" class="upimage"/>
<div hidden="true">
<input type="file" name="file" id="file" hidden="true"/><font color="red">${msg}</font>
</div>
</td>
</tr>
</table>
</form>
</body>
</html>
