jquery 图片本地预览

2023-11-15 16:29•mysql•阅读 2410

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  /></div>
<input type="file"  />
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 >
                                                        <img  />
                                                </div>
                                                <input type="button" value="上传图片" onclick="choose();" class="upimage"/> 
                                                <div hidden="true">
                                                        <input type="file" name="file" >${msg}</font>
                                                </div>
                          
                         </td>
                                </tr>
                        
                        
                




                </table>
        </form>

</body>
</html>

　　