uploadPreview.js
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 (/msie/.test(navigator.userAgent.toLowerCase())) { 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() } }) } });
jquery-1.9.1.min.js
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>图片上传预览演示-罗杰</title> <script src="jquery-1.9.1.min.js" type="text/javascript"></script> <script src="uploadPreview.js" type="text/javascript"></script> <script> $(function () { $("#up").uploadPreview({ Img: "ImgPr", Width: 120, Height: 120 }); }); </script> </head> <body> <div style="width:500px;margin:0px auto;"><h2>图片上传预览演示</h2> <a href="http://keleyi.com/a/bjac/4g8fo9yu.htm" target="_blank">原文</a> <div><img id="ImgPr" width="120" height="120" /></div> <input type="file" id="up" /> </div> </body> </html>
http://www.2cto.com/kf/201402/281430.html
