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：
核心代码（需要jquery的支持）：
(function($){$.fn.mailAutoComplete = function(options){var defaults = {boxClass: "mailListBox", //外部box样式listClass: "mailListDefault", //默认的列表样式focusClass: "mailListFocus", //列表选样式中markCalss: "mailListHlignt", //高亮样式zIndex: 1,autoClass: true, //是否使用插件自带class样式mailArr: ["","","","","","","","","",""], //邮件数组textHint: false, //文字提示的自动显示与隐藏hintText: "",focusColor: "#333"//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 = function(str, arr, cur){var mailHtml = "";if($.isArray(arr)){$.each(arr, function(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 = -1, s;$(this).each(function(){var that = $(this), i = $(".justForJs").size(); if(i > 0){ //只绑定一个文本框return; }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 = $("#mailListBox_" + i), liveValue; //列表框对象that.focus(function(){//父标签的层级$(this).css("color", fc).parent().css("z-index", z); //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(function(e){s = v = $.trim($(this).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++;}else 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()); }}else{if(/@/.test(v)){index = -1;//获得@后面的值//s = v.replace(/@.*/, "");//创建新匹配数组var site = v.replace(/.*@/, "");newArr = $.map(mailArr, function(n){var reg = new RegExp(site); if(reg.test(n)){return n; }});}else{newArr = mailArr;}}x.html($.createHtml(s, newArr, index)).css("left", 0);if(e.keyCode === 13){//回车if(index > -1 && index < newArr.length){//如果当前有激活列表x.css("left", "-6000px"); }}}else{x.css("left", "-6000px"); }}).blur(function(){if(hint && text){var blur_v = $.trim($(this).val());if(blur_v === ""){$(this).val(text);}}$(this).css("color", bc).unbind("keyup").parent().css("z-index",0);x.css("left", "-6000px"); }); //鼠标经过列表项事件//鼠标经过$(".mailHover").live("mouseover", function(){index = Number($(this).attr("id").split("_")[1]); liveValue = $("#mailList_"+index).text();x.children("." + cf).removeClass(cf).addClass(cl);$(this).addClass(cf).removeClass(cl);});});x.bind("mousedown", function(){that.val(liveValue); });});};})(jQuery);
html示例：
<div class="reg_lin1"><div class="lin1_1">常用邮箱：</div><div class="lin1_2"><input type="text" class = "reg_text" id = "email" name = "email"/></div><div class="lin1_3"></div></div>
调用的jquery代码：
$("#email").mailAutoComplete({boxClass: "out_box", //外部box样式listClass: "list_box", //默认的列表样式focusClass: "focus_box", //列表选样式中markCalss: "mark_box", //高亮样式autoClass: false,textHint: true //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：/shenliang123/archive//08/19/3267884.html
