记得去年做某个项目的时候，用到了邮箱输入自动提示功能，于是网上搜了一下，发现了这个写得不错，现在回想起来，转载一下，方便查阅。
邮箱的广泛使用得益于它的免费，因此很多网站在注册的时候都会直接使用邮箱作为账号名
为了提高用户的体验，很多网站都会实现邮箱输入的自动提示功能。
实现效果如图所示：
(function($){ $.fn.mailAutoComplete = (options){ var defaults = { BoxClass: "mailListBox",//外部Box样式 listClass: "mailListDefault",1)">默认的列表样式 focusClass: "mailListFocus",1)">列表选样式中 markCalss: "mailListHlignt",1)">高亮样式 zIndex: 1,autoClass: true,1)">是否使用插件自带class样式 mailArr: ["qq.com","gmail.com","126.com","163.com","hotmail.com","yahoo.com","yahoo.com.cn","live.com","sohu.com","sina.com"],1)">邮件数组 textHint: false,1)">文字提示的自动显示与隐藏 hintText: ""blurColor: "#999" }; var settings = $.extend({},defaults,options || {}); 页面装载CSS样式 if(settings.autoClass && $("#mailListAppendCss").size() === 0){ $('<style id="mailListAppendCss" type="text/css">.mailListBox{border:1px solid #369; background:#fff; font:12px/20px Arial;}.mailListDefault{padding:0 5px;cursor:pointer;white-space:nowrap;}.mailListFocus{padding:0 5px;cursor:pointer;white-space:nowrap;background:#369;color:white;}.mailListHlignt{color:red;}.mailListFocus .mailListHlignt{color:#fff;}</style>').appendTo($("head")); } var cb = settings.BoxClass,cl = settings.listClass,cf = settings.focusClass,cm = settings.markCalss; 插件的class变量 var z = settings.zIndex,newArr = mailArr = settings.mailArr,hint = settings.textHint,text = settings.hintText,fc = settings.focusColor,bc = settings.blurColor; 创建邮件内部列表内容 $.createHtml = (str,arr,cur){ var mailHtml = ""; if($.isArray(arr)){ $.each(arr,(i,n){ if(i === cur){ mailHtml += '<div class="mailHover '+cf+'" id="mailList_'+i+'"><span class="'+cm+'">'+str+'</span>@'+arr[i]+'</div>'; }else{ mailHtml += '<div class="mailHover '+cl+'" id="mailList_'+i+'"><span class="'+cm+'">'+str+'</span>@'+arr[i]+'</div>'; } }); } return mailHtml; }; 一些全局变量 var index = -1this).each((){ var that = $(this),i = $(".justForJs").size(); if(i > 0){ 只绑定一个文本框 ; } var w = that.outerWidth(),h = that.outerHeight(); 获取当前对象（即文本框）的宽高 样式的初始化 that.wrap('<span style="display:inline-block;position:relative;"></span>') .before('<div id="mailListBox_'+i+'" class="justForJs '+cb+'" style="min-width:'+w+'px;_width:'+w+'px;position:absolute;left:-6000px;top:'+h+'px;z-index:'+z+';"></div>'); var x = $("#mailListBox_" + i),liveValue; 列表框对象 that.focus((){ 父标签的层级 $(this).css("color",fc).parent().css("z-index"提示文字的显示与隐藏 if(hint && text){ var focus_v = $.trim($(this).val()); if(focus_v === text){ $(this).val(""); } } 键盘事件 $(this).keyup((e){ s = v = $.trim($().val()); if(/@/.test(v)){ s = v.replace(/@.*/,""); } if(v.length > 0){ 如果按键是上下键 if(e.keyCode === 38){ 向上 if(index <= 0){ index = newArr.length; } index--; }else if(e.keyCode === 40向下 if(index >= newArr.length - 1){ index = -1; } index++if(e.keyCode === 13回车 if(index > -1 && index < newArr.length){ 如果当前有激活列表 $(this).val($("#mailList_"+index).text()); } }{ .test(v)){ index = -1; 获得@后面的值 s = v.replace(/@.*/,""); 创建新匹配数组 var site = v.replace(/.*@/,1)">); newArr = $.map(mailArr,1)">(n){ var reg = new RegExp(site); (reg.test(n)){ n; } }); }{ newArr = mailArr; } } x.html($.createHtml(s,newArr,index)).css("left",0); 如果当前有激活列表 x.css("left","-6000px"); } } }{ x.css("left",1)">); } }).blur((){ text){ var blur_v = $.trim($().val()); if(blur_v === ""){ $().val(text); } } $(); x.css("left",1)">); }); 鼠标经过列表项事件 鼠标经过 $(".mailHover").live("mouSEOver",1)">(){ index = Number($(this).attr("id").split("_")[1]); liveValue = $("#mailList_"+index).text(); x.children("." + cf).removeClass(cf).addClass(cl); $().addClass(cf).removeClass(cl); }); }); x.bind("mousedown",1)">(){ that.val(liveValue); }); }); }; })(jQuery);
html示例：
<div class="reg_lin1"> ="lin1_1">常用邮箱：</div="lin1_2"><input type="text" class = "reg_text" id = "email" name = "email"/></="lin1_3"></>
$("#email").mailAutoComplete({
BoxClass: "out_Box",1)">外部Box样式
listClass: "list_Box",1)">默认的列表样式
focusClass: "focus_Box",1)">列表选样式中
markCalss: "mark_Box",1)">高亮样式
autoClass: falsetrue 提示文字自动隐藏
});
css，这大家自己修改成自己想要的色调
<style type="text/css"> .out_Box{border:1px solid #ccc; background:#fff; font:12px/20px Tahoma;} .list_Box{border-bottom:1px solid #eee; padding:0 5px; cursor:pointer;} .focus_Box{background:#f0f3f9;} .mark_Box{color:#c00;} </style>
转载地址：http://www.cnblogs.com/shenliang123/archive/2013/08/19/3267884.html
