jQuery 实现邮箱输入自动提示功能：（一）

(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);

<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
});

  <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>