js仿QQ邮箱收件人选择与搜索功能

<#--左侧-->
<div>
 <label>To:</label>
 <div id="divtxt" class="mailtxt_div"></div>
 <input type="hidden" name="messName" id="messName"/>
 <input type="hidden" name="messId" id="messId"/>
</div>
<div>
 <label>Subject:</label>
 <input type="text" name="messTitle" id="messTitle"/>
</div>
<div>
 <label>Message:</label>
 <textarea name="ddContent" id="ddContent"></textarea>
</div>
<#--右侧-->
<div>
 <input calss="search_mail" type="text" value="Search Contact..." onclick="if(this.value==
'Search Contact...')this.value='';" onblur="if(this.value=='')this.value='Search Contact...';" 
name="txtsearch" />
 <div><img src="/images/email03.png" /></div>
</div>
<div class="mailclist">
 <ul>
  <li>
   <div class="firstmail" title="Cata food, S.L." alt="aa@qq.com" 
    ass="Cata food, S.L.">Cata food, S.L.</div>
  </li>
  <li>
   <div class="firstmail" title="Anqing Beverage" alt="bb@qq.com" 
    ass="Anqing Beverage">Anqing Beverage</div>
  </li>
  <li>
   <div class="firstmail" title="123456ew" alt="cc@qq.com" 
    ass="123456ew">123456ew</div>
  </li>
 </ul>
</div>

<script type="text/javascript">
$(function(){  
 //点击收件人列表到收件人
  $(".firstmail").bind("click",function(){
   var $mailTo=$(this).attr("ass");//收件人名称
   var $mailToId=$(this).attr("alt");//收件人Id
   var $divtxt_val=$("#divtxt").text();//收件人框中的值
   var $messId=$("#messId").val();//隐藏的收件人Id
   if($divtxt_val.indexOf($mailTo)<0){//若不存在，则拼接
    $("#divtxt").append("<span class='rece' alt='"+$mailToId+";'>"
    +$mailTo+";"+"</span>");
    $messId=$messId+$mailToId+";";
   }
   $("#messId").val($messId);
   $("#messName").val($("#divtxt").text());//隐藏的收件人名称
  });
  
  //点击某个收件人，添加样式
   $(".rece").live("click",function(){
    $("#divtxt").find(".rece").removeClass("on");
    $("#divtxt").find(".rece").css("background-color","").css("color","")
    $(this).addClass("on").css("background-color", "#545f59").css("color","#fff");
   });
  
  //点击删除键跟退格键，删除对应的收件人
  $(document).bind('keydown',
  function(event) {
    var $messId=$("#messId").val();//收件人Id的值
    var $span_alt=$("#divtxt .on").attr("alt");//选中的收件人
    if($span_alt != null){
    var $index,$span_size,$mess_size,$val;
    $index=$messId.indexOf($span_alt);
    $span_size=$span_alt.length;
    $mess_size=$messId.length;
    //删除对应的收件人Id
    $val=$messId.substring(0,$index)
     +$messId.substring($index+$span_size,$mess_size);
    $("#messId").val($val);
    if(46==event.keyCode ){ //Delete键    
     $("#divtxt .on").remove();
     $("#messName").val($("#divtxt").text());    
    }else if(8==event.keyCode){//退格键
     $("#divtxt .on").remove();
     $("#messName").val($("#divtxt").text());
     return false;
    }
   }  
  }
 );
 
 //搜索框搜索事件
 $(".search_mail").bind("blur",function(){
   var content = $(this).val();
   if("Search Contact..." != content && content !=""){
    $(".mailclist li div").each(function(){
     var name = $(this).text();
     if(name.indexOf(content) == -1){
      $(this).hide();
     }else{
      $(this).show();
     }
    });
   } else {
    $(".mailclist li div").show();
   }
  });
});
</script>