jquery implements mailbox autofill prompt function_jquery

The widespread use of email is due to the fact that it is free, so many websites will directly use email as their account name when registering
In order to improve the user experience, many websites will implement the automatic prompt function for email input. I have also implemented one myself. Let’s take a look at the effect first. If you think the effect is good, use it

Core code (requires jquery support):

(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){
  $('<style id="mailListAppendCss" type="text/css">.mailListBox{border:1px solid #369; background:#fff; font:12px/20px Arial;}.mailListDefault{padding:0 5px;cursor:pointer;white-space:nowrap;}.mailListFocus{padding:0 5px;cursor:pointer;white-space:nowrap;background:#369;color:white;}.mailListHlignt{color:red;}.mailListFocus .mailListHlignt{color:#fff;}</style>').appendTo($("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);

page (here is a div as an example):

<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>
<script type="text/javascript">
$("#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
});
</script>

There is also some css, you may need to modify this to the color you want

<!-- 邮箱自动提示的css -->
 <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>

The above is all the code for jquery to implement the mailbox autofill prompt function. I hope it will be helpful to everyone's learning.