zoukankan      html  css  js  c++  java
  • JS实现本地图片预览

    代码:


    <script>
    function setImagePreview(localImag,doc,imgId) {
            var docObj=document.getElementById(doc);
            var imgObjPreview=document.getElementById(imgId);
                    if(docObj.files &&    docObj.files[0]){
                            //火狐下,直接设img属性
                            imgObjPreview.style.display = 'block';
                            imgObjPreview.style.width = '128px';
                            imgObjPreview.style.height = '128px';                    
                            //imgObjPreview.src = docObj.files[0].getAsDataURL();
     
          //火狐7以上版本不能用上面的getAsDataURL()方式获取,需要一下方式  
          imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);
     
                    }else{
                            //IE下,使用滤镜
                            docObj.select();
                            var imgSrc = document.selection.createRange().text;
                            var localImagId = document.getElementById(localImag);
                            //必须设置初始大小
                            localImagId.style.width = "128px";
                            localImagId.style.height = "128px";
                            //图片异常的捕捉,防止用户修改后缀来伪造图片
                            try{
                                    localImagId.style.filter="progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
                                    localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;
                            }catch(e){
                                    alert("您上传的图片格式不正确,请重新选择!");
                                        docObj.select();    
                                        document.execCommand("delete");
                                    return false;
                            }
                            imgObjPreview.style.display = 'none';
                            document.selection.empty();
                    }
                    return true;
            }
    </script>
    <div id="localImag">
        <img id="imgId" />
    </div>

    <input name="image" type="file" id="doc" onchange="javascript:setImagePreview('localImag','doc','imgId');">
  • 相关阅读:
    asp.net 2.0 treeview控件“简单”操纵
    http://www.cnblogs.com/Terrylee/archive/2006/11/12/aspnet_ajax_quickstarts.html(ajax入门 )
    JS实面treeview中选中父节点,子节点也选中
    系统地学习ASP.NET AJAX(5) 客户端脚本编程(Sys.UI命名空间下的类和快捷方法)(转)
    图例显示投标数据
    怎么用正则表达式判断数字(包括正,负,小数。。)
    treeview常见用法
    TreeView小结
    sql split分隔
    WCF 漫谈
  • 原文地址:https://www.cnblogs.com/huangzhijun/p/3182628.html
Copyright © 2011-2022 走看看