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input上传图片显示预览信息

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>uploadPreview演示</title>
    <script src="uploadPreview.js" type="text/javascript"></script>
    <script>
       window.onload = function () { 
            new uploadPreview({ UpBtn: "up_img", DivShow: "imgdiv", ImgShow: "imgShow" });
        }
    </script>
</head>
<body>
    <div id="imgdiv"><img id="imgShow" width="100" height="100" /></div>
    <input type="file" id="up_img" />
</body>
</html>

var uploadPreview = function(setting) {
    /*
    *this(当前对象)
    */
    var _self = this;
    /*
    *判断为null或者空值
    */
    _self.IsNull = function(value) {
        if (typeof (value) == "function") { return false; }
        if (value == undefined || value == null || value == "" || value.length == 0) {
            return true;
        }
        return false;
    }
    /*
    *:默认配置
    */
    _self.DefautlSetting = {
        UpBtn: "",
        DivShow: "",
        ImgShow: "",
        Width: 100,
        Height: 100,
        ImgType: ["gif", "jpeg", "jpg", "bmp", "png"],
        ErrMsg: "选择文件错误,图片类型必须是(gif,jpeg,jpg,bmp,png)中的一种",
        callback: function() { }
    };
    /*
    *读取配置
    */
    _self.Setting = {
        UpBtn: _self.IsNull(setting.UpBtn) ? _self.DefautlSetting.UpBtn : setting.UpBtn,
        DivShow: _self.IsNull(setting.DivShow) ? _self.DefautlSetting.DivShow : setting.DivShow,
        ImgShow: _self.IsNull(setting.ImgShow) ? _self.DefautlSetting.ImgShow : setting.ImgShow,
        Width: _self.IsNull(setting.Width) ? _self.DefautlSetting.Width : setting.Width,
        Height: _self.IsNull(setting.Height) ? _self.DefautlSetting.Height : setting.Height,
        ImgType: _self.IsNull(setting.ImgType) ? _self.DefautlSetting.ImgType : setting.ImgType,
        ErrMsg: _self.IsNull(setting.ErrMsg) ? _self.DefautlSetting.ErrMsg : setting.ErrMsg,
        callback: _self.IsNull(setting.callback) ? _self.DefautlSetting.callback : setting.callback
    };
    /*
    *获取文本控件URL
    */
    _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;
    }
    /*
    *绑定事件
    */
    _self.Bind = function() {
        document.getElementById(_self.Setting.UpBtn).onchange = function() {
            if (this.value) {
                if (!RegExp(".(" + _self.Setting.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) {
                    alert(_self.Setting.ErrMsg);
                    this.value = "";
                    return false;
                }
                if (navigator.userAgent.indexOf("MSIE") > -1) {
                    try {
                        document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
                    } catch (e) {
                        var div = document.getElementById(_self.Setting.DivShow);
                        this.select();
                        top.parent.document.body.focus();
                        var src = document.selection.createRange().text;
                        document.selection.empty();
                        document.getElementById(_self.Setting.ImgShow).style.display = "none";
                        div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
                        div.style.width = _self.Setting.Width + "px";
                        div.style.height = _self.Setting.Height + "px";
                        div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src;
                    }
                } else {
                    document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]);
                }
                _self.Setting.callback();
            }
        }
    }
    /*
    *执行绑定事件
    */
    _self.Bind();
}

uploadPreview.js

/*
*插件作者:周祥
*插件介绍:图片上传本地预览插件
*插件网站:http://jquery.decadework.com
*作  者QQ:200592114
*/
var uploadPreview = function(setting) { var _self = this; _self.IsNull = function(value) { if (typeof (value) == "function") { return false; } if (value == undefined || value == null || value == "" || value.length == 0) { return true }; return false; }; _self.DefautlSetting = { UpBtn: "", DivShow: "", ImgShow: "", Width: 100, Height: 100, ImgType: ["gif", "jpeg", "jpg", "bmp", "png"], ErrMsg: "选择文件错误,图片类型必须是(gif,jpeg,jpg,bmp,png)中的一种", callback: function() { } }; _self.Setting = { UpBtn: _self.IsNull(setting.UpBtn) ? _self.DefautlSetting.UpBtn : setting.UpBtn, DivShow: _self.IsNull(setting.DivShow) ? _self.DefautlSetting.DivShow : setting.DivShow, ImgShow: _self.IsNull(setting.ImgShow) ? _self.DefautlSetting.ImgShow : setting.ImgShow, Width: _self.IsNull(setting.Width) ? _self.DefautlSetting.Width : setting.Width, Height: _self.IsNull(setting.Height) ? _self.DefautlSetting.Height : setting.Height, ImgType: _self.IsNull(setting.ImgType) ? _self.DefautlSetting.ImgType : setting.ImgType, ErrMsg: _self.IsNull(setting.ErrMsg) ? _self.DefautlSetting.ErrMsg : setting.ErrMsg, callback: _self.IsNull(setting.callback) ? _self.DefautlSetting.callback : setting.callback }; _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; }; _self.Bind = function() { document.getElementById(_self.Setting.UpBtn).onchange = function() { if (this.value) { if (!RegExp(".(" + _self.Setting.ImgType.join("|") + ")$", "i").test(this.value.toLowerCase())) { alert(_self.Setting.ErrMsg); this.value = ""; return false }; if (navigator.userAgent.indexOf("MSIE") > -1) { try { document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]); } catch (e) { var div = document.getElementById(_self.Setting.DivShow); this.select(); top.parent.document.body.focus(); var src = document.selection.createRange().text; document.selection.empty(); document.getElementById(_self.Setting.ImgShow).style.display = "none"; div.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)"; div.style.width = _self.Setting.Width + "px"; div.style.height = _self.Setting.Height + "px"; div.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = src; } } else { document.getElementById(_self.Setting.ImgShow).src = _self.getObjectURL(this.files[0]); }; _self.Setting.callback(); } } }; _self.Bind(); }

uploadPreview.min.js

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原文地址：https://www.cnblogs.com/dongxiaolei/p/6043742.html

input上传图片 显示预览信息

input上传图片显示预览信息