先为大家分享一段关于js图片预览的代码,兼容火狐和谷歌浏览器
/* 案例展示图片预览 */$(function(){ $("#file0").bind("change",function(){ clickupLoad(); });});function clickupLoad(){ var imgObject = document.getElementById('file0'); var getImageSrc = getFullPath(imgObject); // 本地路径 var srcs = window.URL.createObjectURL(imgObject.files[0]); var pos = getImageSrc.lastIndexOf("."); var lastname = getImageSrc.substring(pos, getImageSrc.length) // 图片后缀] if(srcs!=""){ $("#yulan2").attr("src",srcs); }else{ alert("请选择一张图片"); } }function getFullPath(obj) { //得到图片的完整路径 if (obj) { if (window.navigator.userAgent.indexOf("MSIE") >= 1){ obj.select(); return document.selection.createRange().text; }else if(window.navigator.userAgent.indexOf("Firefox") >= 1) { if (obj.files) { return window.URL.createObjectURL(obj.files[0]); } return obj.value; } return obj.value; }}
实例代码实现js上传图片及时预览:
图片上传本地预览 <script type="text/javascript"> //图片上传预览 IE是用了滤镜。 function previewImage(file) { var MAXWIDTH = 260; var MAXHEIGHT = 180; var p = document.getElementById('preview'); if (file.files && file.files[0]) { p.innerHTML =' '; var img = document.getElementById('imghead'); img.onload = function(){ var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); img.width = rect.width; img.height = rect.height;// img.style.marginLeft = rect.left+'px'; img.style.marginTop = rect.top+'px'; } var reader = new FileReader(); reader.onload = function(evt){img.src = evt.target.result;} reader.readAsDataURL(file.files[0]); } else //兼容IE { var sFilter='filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="'; file.select(); var src = document.selection.createRange().text; p.innerHTML = ' '; var img = document.getElementById('imghead'); img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src; var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight); status =('rect:'+rect.top+','+rect.left+','+rect.width+','+rect.height); p.innerHTML = ""; } } function clacImgZoomParam( maxWidth, maxHeight, width, height ){ var param = {top:0, left:0, width:width, height:height}; if( width>maxWidth || height>maxHeight ) { rateWidth = width / maxWidth; rateHeight = height / maxHeight; if( rateWidth > rateHeight ) { param.width = maxWidth; param.height = Math.round(height / rateWidth); }else { param.width = Math.round(width / rateHeight); param.height = maxHeight; } } param.left = Math.round((maxWidth - param.width) / 2); param.top = Math.round((maxHeight - param.height) / 2); return param; }《script》/images/defaul.jpg'>
以上就是本文的全部内容,希望对大家学习javascript程序设计有所帮助。