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){vardefaults ={
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: ["QQ.com","Gmail.com","126.com","163.com","hotmail.com","yahoo.com","yahoo.com.cn","live.com","sohu.com","sina.com"],//邮件数组textHint:false,//文字提示的自动显示与隐藏hintText: "",
focusColor:"#333"//blurColor: "#999"};varsettings = $.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"));
}varcb = settings.boxClass, cl = settings.listClass, cf = settings.focusClass, cm = settings.markCalss;//插件的class变量varz = 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$.createHtml =function(str, arr, cur){varmailHtml = "";if($.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>';
}
});
}returnmailHtml;
};//一些全局变量varindex = -1, s;
$(this).each(function(){varthat = $(this), i = $(".justForJs").size();if(i > 0){//只绑定一个文本框return;
}varw = 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>');varx = $("#mailListBox_" + i), liveValue;//列表框对象that.focus(function(){//父标签的层级$(this).css("color", fc).parent().css("z-index", z);//提示文字的显示与隐藏if(hint &&text){varfocus_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--;
}elseif(e.keyCode === 40){//向下if(index >= newArr.length - 1){
index= -1;
}
index++;
}elseif(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varsite = v.replace(/.*@/, "");
newArr= $.map(mailArr,function(n){varreg =newRegExp(site);if(reg.test(n)){returnn;
}
});
}else{
newArr=mailArr;
}
}
x.html($.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){varblur_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：
<divclass="reg_lin1"><divclass="lin1_1">常用邮箱：</div><divclass="lin1_2"><inputtype="text"class= "reg_text"id= "email"name= "email"/></div><divclass="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：http://www.cnblogs.com/shenliang123/archive/2013/08/19/3267884.html