上传文件实时显示【一张图片】:
个人理解:给img的src传值:这个值就是input[type=‘file‘]的value;
不过你要判断浏览器类型【很多】:IE6.0,IE7/8/9,Fixfox7.0以下,Firefox7.0+ ,Chrome。。。。。
直接贴代码【网上找的,记不得是哪位大神写的了】
function PreviewImage(obj, imgPreviewId, divPreviewId) { var allowExtention = ".jpg,.bmp,.gif,.png"; //,允许上传文件的后缀名 var extention = obj.value.substring(obj.value.lastIndexOf(".") + 1).toLowerCase(); var browserVersion = window.navigator.userAgent.toUpperCase(); if (allowExtention.indexOf(extention) > -1) { if (browserVersion.indexOf("MSIE") > -1) { if (browserVersion.indexOf("MSIE 6.0") > -1) {//ie6 document.getElementById(imgPreviewId).setAttribute("src", obj.value); } else {//ie[7-8]、ie9 obj.select(); var newPreview = document.getElementById(divPreviewId + "New"); if (newPreview == null) { newPreview = document.createElement("div"); newPreview.setAttribute("id", divPreviewId + "New"); newPreview.style.width = 160; newPreview.style.height = 170; newPreview.style.border = "solid 1px #d2e2e2"; } newPreview.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=‘scale‘,src=‘" + document.selection.createRange().text + "‘)"; var tempDivPreview = document.getElementById(divPreviewId); tempDivPreview.parentNode.insertBefore(newPreview, tempDivPreview); tempDivPreview.style.display = "none"; } } else if (browserVersion.indexOf("FIREFOX") > -1) {//firefox var firefoxVersion = parseFloat(browserVersion.toLowerCase().match(/firefox\/([\d.]+)/)[1]); if (firefoxVersion < 7) {//firefox7以下版本 document.getElementById(imgPreviewId).setAttribute("src", obj.files[0].getAsDataURL()); } else {//firefox7.0+ document.getElementById(imgPreviewId).setAttribute("src", window.URL.createObjectURL(obj.files[0])); } } else if (obj.files) { //兼容chrome、火狐等,HTML5获取路径 if (typeof FileReader !== "undefined") { var reader = new FileReader(); reader.onload = function (e) { document.getElementById(imgPreviewId).setAttribute("src", e.target.result); } reader.readAsDataURL(obj.files[0]); } else if (browserVersion.indexOf("SAFARI") > -1) { alert("暂时不支持Safari浏览器!"); } } else { document.getElementById(divPreviewId).setAttribute("src", obj.value); } } else { alert("仅支持" + allowExtention + "为后缀名的文件!"); obj.value = ""; //清空选中文件 if (browserVersion.indexOf("MSIE") > -1) { obj.select(); document.selection.clear(); } obj.outerHTML = obj.outerHTML; } }
Html调用
<body> <form name="form5" id="form5"> <img id="imgView" src="" alt="" height="170" style="border:1px solid red" /><br> <input type="file" name="file5" id="file5" onchange="PreviewImage(this,‘imgView‘,‘divNewPreview‘)" /> <div id="divNewPreview"></div> </form> </body>
时间: 2024-10-06 03:01:58