jquery 图片上传按比例预览插件集合

js部分是这样的: 复制代码代码如下: //**********************图片上传预览插件************************ //作者：IDDQD(2009-07-01) //Email：iddqd5376@163.com //http://blog.sina.com.cn/iddqd //版本：1.0 //说明：图片上传预览插件 //上传的时候可以生成固定宽高范围内的等比例缩放图 //参数设置： //width 存放图片固定大小容器的宽 //height 存放图片固定大小容器的高 //imgDiv 页面DIV的JQuery的id //imgType 数组后缀名 //**********************图片上传预览插件************************* (function($) { jQuery.fn.extend({ uploadPreview: function(opts) { opts = jQuery.extend({ width: 0, height: 0, imgDiv: "#imgDiv", imgType: ["gif", "jpeg", "jpg", "bmp", "png"], callback: function() { return false; } }, opts || {}); var _self = this; var _this = $(this); var imgDiv = $(opts.imgDiv); imgDiv.width(opts.width); imgDiv.height(opts.height); autoScaling = function() { if ($.browser.version == "7.0" || $.browser.version == "8.0") imgDiv.get(0).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "image"; var img_width = imgDiv.width(); var img_height = imgDiv.height(); if (img_width > 0 && img_height > 0) { var rate = (opts.width / img_width < opts.height / img_height) ? opts.width / img_width : opts.height / img_height; if (rate <= 1) { if ($.browser.version == "7.0" || $.browser.version == "8.0") imgDiv.get(0).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "scale"; imgDiv.width(img_width * rate); imgDiv.height(img_height * rate); } else { imgDiv.width(img_width); imgDiv.height(img_height); } var left = (opts.width - imgDiv.width()) * 0.5; var top = (opts.height - imgDiv.height()) * 0.5; imgDiv.css({ "margin-left": left, "margin-top": top }); imgDiv.show(); } } _this.change(function() { if (this.value) { if (!RegExp(".(" + opts.imgType.join("|") + ")$", "i").test(this.value.toLowerCase())) { alert("图片类型必须是" + opts.imgType.join("，") + "中的一种"); this.value = ""; return false; } imgDiv.hide(); if ($.browser.msie) { if ($.browser.version == "6.0") { var img = $("<img />"); imgDiv.replaceWith(img); imgDiv = img; var image = new Image(); image.src = 'file:///' + this.value; imgDiv.attr('src', image.src); autoScaling(); } else { imgDiv.css({ filter: "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=image)" }); imgDiv.get(0).filters.item("DXImageTransform.Microsoft.AlphaImageLoader").sizingMethod = "image"; try { imgDiv.get(0).filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = this.value; } catch (e) { alert("无效的图片文件！"); return; } setTimeout("autoScaling()", 100); } } else { var img = $("<img />"); imgDiv.replaceWith(img); imgDiv = img; imgDiv.attr('src', this.files.item(0).getAsDataURL()); imgDiv.css({ "vertical-align": "middle" }); setTimeout("autoScaling()", 100); } } }); } }); })(jQuery); 页面部分: 复制代码代码如下: <!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 runat="server"> <title></title> <meta content="" name="Keywords" /> <meta content="" name="Description" /> <meta content="text/html;charset=utf-8" http-equiv="Content-Type" /> <script type="text/javascript" src="js/jquery.pack.js"></script> <script type="text/javascript" src="js/uploadPreview/jquery.uploadPreview.js"></script> <script type="text/javascript"> $(document).ready(function() { //建议在#imgDiv的父元素上加个overflow:hidden;的css样式 $("input").uploadPreview({ width: 200, height: 200, imgDiv: "#imgDiv", imgType: ["bmp", "gif", "png", "jpg"] }); }); </script> </head> <body> <form id="form1" runat="server"> <input type="file" /> <br /> <div style="width: 200px; height: 200px; overflow: hidden; border: 1px solid red;"> <div id="imgDiv"> </div> </div> </form> </body> </html>

　　推荐阅读

　　js中关于String对象的replace使用详解

今天在读Qwrap的源码stringH时里边有个复制代码代码如下: format: function(s, arg0) { var args = arguments; return s.replace(/{(d+)}/ig, function(a, b) { return args[(b | 0) + 1] || ''; }); } 它的>>>详细阅读

本文标题：jquery 图片上传按比例预览插件集合

地址：http://www.17bianji.com/kaifa2/JS/24556.html

1/2 1