js實現的文字框輸入內容自動提示效果程式碼

admin發表於2017-03-23
JS

本章節分享一段這樣的例項程式碼，那就是當文字框輸入關鍵字的時候，能夠實現自動提示效果，這樣的功能在大量的網站使用，比如百度也有類似的功能，希望下面的程式碼能夠給大家帶來參考作用。

程式碼如下:

[HTML] 純文字檢視 複製程式碼
<!DOCTYPE html>    
<html>    
<head>    
<meta charset=" utf-8">    
<meta name="author" content="http://www.softwhy.com/" />    
<title>螞蟻部落</title> 
<style type="text/css">
body{
  margin-left:0px;
  margin-top:0px;
  margin-right:0px;
  margin-bottom:0px;
}
.auto_hidden{
  width:204px;border-top:1px solid #333;
  border-bottom:1px solid #333;
  border-left:1px solid #333;
  border-right:1px solid #333;
  position:absolute;
  display:none;
}
.auto_show{
  width:204px;
  border-top:1px solid #333;
  border-bottom:1px solid #333;
  border-left:1px solid #333;
  border-right:1px solid #333;
  position:absolute;
  z-index:9999; /* 設定物件的層疊順序 */
  display:block;
}
.auto_onmouseover{
  color:#ffffff;
  background-color:highlight;
  width:100%;
}
.auto_onmouseout{
  color:#000000;
  width:100%;
  background-color:#ffffff;
}
</style>
<script type="text/javascript">
var $ = function (id) {
  return "string" == typeof id ? document.getElementById(id) : id;
}
var Bind = function(object, fun) {
  return function() {
    return fun.apply(object, arguments);
  }
}
function AutoComplete(obj,autoObj,arr){
  this.obj=$(obj);        //輸入框
  this.autoObj=$(autoObj);//DIV的根節點
  this.value_arr=arr;        //不要包含重複值
  this.index=-1;          //當前選中的DIV的索引
  this.search_value="";   //儲存當前搜尋的字元
}
AutoComplete.prototype={
  //初始化DIV的位置
  init: function(){
    this.autoObj.style.left = this.obj.offsetLeft + "px";
    this.autoObj.style.top  = this.obj.offsetTop + this.obj.offsetHeight + "px";
    this.autoObj.style.width= this.obj.offsetWidth - 2 + "px";//減去邊框的長度2px  
   },
   //刪除自動完成需要的所有DIV
   deleteDIV: function(){
     while(this.autoObj.hasChildNodes()){
       this.autoObj.removeChild(this.autoObj.firstChild);
     }
     this.autoObj.className="auto_hidden";
   },
   //設定值
   setValue: function(_this){
     return function(){
       _this.obj.value=this.seq;
       _this.autoObj.className="auto_hidden";
     }      
   },
   //模擬滑鼠移動至DIV時，DIV高亮
   autoOnmouseover: function(_this,_div_index){
     return function(){
       _this.index=_div_index;
       var length = _this.autoObj.children.length;
       for(var j=0;j<length;j++){
         if(j!=_this.index ){      
           _this.autoObj.childNodes[j].className='auto_onmouseout';
         }
                 else{
           _this.autoObj.childNodes[j].className='auto_onmouseover';
         }
       }
     }
   },
   //更改classname
   changeClassname: function(length){
     for(var i=0;i<length;i++){
       if(i!=this.index ){      
         this.autoObj.childNodes[i].className = 'auto_onmouseout';
       }
       else{
         this.autoObj.childNodes[i].className='auto_onmouseover';
         this.obj.value=this.autoObj.childNodes[i].seq;
       }
     }
   },
   //響應鍵盤
   pressKey:function(event){
     var length = this.autoObj.children.length;
     //游標鍵"↓"
     if(event.keyCode==40){
       ++this.index;
       if(this.index>length){
         this.index=0;
       }
       else if(this.index==length){
         this.obj.value=this.search_value;
       }
       this.changeClassname(length);
     }
     //游標鍵"↑"
     else if(event.keyCode==38){
       this.index--;
       if(this.index<-1){
         this.index=length - 1;
       }
       else if(this.index==-1){
         this.obj.value=this.search_value;
       }
       this.changeClassname(length);
     }
     //Enter鍵
   else if(event.keyCode==13){
       this.autoObj.className="auto_hidden";
       this.index=-1;
     }
     else{
       this.index=-1;
     }
   },
   //程式入口
   start: function(event){
     if(event.keyCode!=13&&event.keyCode!=38&&event.keyCode!=40){
       this.init();
       this.deleteDIV();
       this.search_value=this.obj.value;
       var valueArr=this.value_arr;
       valueArr.sort();
       if(this.obj.value.replace(/(^\s*)|(\s*$)/g,'')==""){ return; }//值為空，退出
         try{ var reg = new RegExp("(" + this.obj.value + ")","i");}
         catch (e){ return; }
         var div_index=0;//記錄建立的DIV的索引
         for(var i=0;i<valueArr.length;i++){
           if(reg.test(valueArr[i])){
             var div = document.createElement("div");
             div.className="auto_onmouseout";
             div.seq=valueArr[i];
             div.onclick=this.setValue(this);
             div.onmouseover=this.autoOnmouseover(this,div_index);
             div.innerHTML=valueArr[i].replace(reg,"<strong>$1</strong>");//搜尋到的字元粗體顯示
             this.autoObj.appendChild(div);
             this.autoObj.className="auto_show";
             div_index++;
           }
         }
      }
      this.pressKey(event);
      window.onresize=Bind(this,function(){this.init();});
   }
}
window.onload=function(){
  var autoComplete=new AutoComplete('o','auto',['b22','b3','b4','b5','b6','b7','b8','b2','abd']);
  var o=document.getElementById("o");
  o.onkeyup=function(){
    autoComplete.start(event)
  }
}
</script>
</head>
<body>
<div align="center"><input type="text" id="o"/></div>
<div class="auto_hidden" id="auto"><!--自動完成 DIV--></div>
</body>
</html>

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