這篇文章主要介紹了郵箱下拉自動填充選擇的具體實現,需要的朋友可以參考下
1.需要一個js文件：jquery.mailAutoComplete-3.1.js 代碼如下: (function($){ $.fn.mailAutoComplete = function(options){ var defaults = { boxClass: "mailListBox", //外部box樣式 listClass: "mailListDefault", //默認的列表樣式 focusClass: "mailListFocus", //列表選樣式中 markCalss: "mailListHlignt", //高亮樣式 zIndex: 1, autoClass: true, //是否使用插件自帶class樣式 mailArr: ["qq.com","gmail.com","126.com","163.com","hotmail.com","yahoo.com","yahoo.com.cn","live.com","sohu.com","sina.com"], //郵件數組 textHint: false, //文字提示的自動顯示與隱藏 hintText: "", focusColor: "#333", blurColor: "#999" }; var settings = $.extend({}, defaults, options || {}); //頁面裝載CSS樣式 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變量 var z = settings.zIndex, newArr = mailArr = settings.mailArr, hint = settings.textHint, text = settings.hintText, fc = settings.focusColor, bc = settings.blurColor; //創建郵件內部列表內容 $.createHtml = function(str, arr, cur){ var mailHtml = ""; if($.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; }; //一些全局變量 var index = -1, s; $(this).each(function(){ var that = $(this), i = $(".justForJs").size(); if(i > 0){ //只綁定一個文本框 return; } var w = that.outerWidth(), h = that.outerHeight(); //獲取當前對象（即文本框）的寬高 //樣式的初始化 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; //列表框對象 that.focus(function(){ //父標簽的層級 $(this).css("color", fc).parent().css("z-index", z); //提示文字的顯示與隱藏 if(hint && text){ var focus_v = $.trim($(this).val()); if(focus_v === text){ $(this).val(""); } } //鍵盤事件 $(this).keyup(function(e){ s = v = $.trim($(this).val()); if(/@/.test(v)){ s = v.replace(/@.*/, ""); } if(v.length > 0){ //如果按鍵是上下鍵 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){ //回車 if(index > -1 && index < newArr.length){ //如果當前有激活列表 $(this).val($("#mailList_"+index).text()); } }else{ if(/@/.test(v)){ index = -1; //獲得@後面的值 //s = v.replace(/@.*/, ""); //創建新匹配數組 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){ //回車 if(index > -1 && index < newArr.length){ //如果當前有激活列表 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"); }); //鼠標經過列表項事件 //鼠標經過 $(".mailHover").live("mouseover", function(){ index = Number($(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); 2.jq庫當然必不可少了，這裡就略了 下面來測試 3.樣式表： 代碼如下: <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> 4.測試代碼 代碼如下: <p>自定義class展示：<input type="text" id="customTest" size="28" /></p> <script src="js/jquery-1.6.min.js" type="text/javascript"></script> <script src="js/jquery.mailAutoComplete-3.1.js" type="text/javascript"></script> <script type="text/javascript"> $(function() { $("#customTest").mailAutoComplete({ boxClass: "out_box", //外部box樣式 listClass: "list_box", //默認的列表樣式 focusClass: "focus_box", //列表選樣式中 markCalss: "mark_box", //高亮樣式 autoClass: false, textHint: true, //提示文字自動隱藏 hintText: "請輸入郵箱地址" }); }) </script>