邮箱下拉自动填充选择示例代码附图_javascript技巧

1.需要一个js文件：jquery.mailAutoComplete-3.1.js

(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: ["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"
};
var settings = $.extend({}, defaults, options || {});

//页面装载CSS样式
if(settings.autoClass && $("#mailListAppendCss").size() === 0){
$('').appendTo($("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 += '

'+str+'@'+arr[i]+'

';
}else{
mailHtml += '

'+str+'@'+arr[i]+'

';
}
});
}
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('')
.before('');
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 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 //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 //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);

2.jq库当然必不可少了，这里就略了

下面来测试

3.样式表：

4.测试代码

自定义class展示：