JavaScript imitation Baidu input box prompts automatic drop-down completion

JavaScript imitation Baidu input box prompts automatic drop-down completion_javascript skills

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Release： 2016-05-16 15:21:05

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The example in this article explains the automatic pull-down completion operation of the JavaScript input box, imitating the Baidu and Google search box prompts. The specific content is as follows

Rendering:

Specific code:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
 <HEAD>
 <TITLE> New Document </TITLE>
 <META NAME="Generator" CONTENT="EditPlus">
 <META NAME="Author" CONTENT="">
 <META NAME="Keywords" CONTENT="">
 <META NAME="Description" CONTENT="">
 <script type="text/javascript" src="jquery.js"></script>
  <script type="text/javascript">
  /*自动下拉补全 zhk */
  var highlightindex=-1;//当前高亮的节点
 $(document).ready(function(){
 var wordInput=$("#word");
 var wordInputOffset=wordInput.offset();
 
  $("#auto").hide().css("border","1px black solid").css("position","absolute")
  .css("top",wordInputOffset.top+wordInput.height()+5+"px")
  .css("left",wordInputOffset.left+"px").width(wordInput.width()+2);
 
 wordInput.keyup(function (event){
 
  var myEvent=event||window.event;
  var keyCode=myEvent.keyCode;
  if(keyCode>=65&&keyCode<=90||keyCode==8||keyCode==46){
 
   var wordText=$("#word").val();
   var autoNode=$("#auto");
   if(wordText!=""){
   
    
    var wordNodes=$("span");
    
    autoNode.html("");
    wordNodes.each(function(i){
     var wordNode=$(this);
     var newDivNode=$("<div>").attr("id",i);
      
     newDivNode.html(wordNode.text()).appendTo(autoNode);
     newDivNode.mouseover(function(){//鼠标进入
      if(highlightindex!=-1){
        $("#auto").children("div").eq(highlightindex)
        .css("background-color","white");
       }
       highlightindex=$(this).attr("id");
       $(this).css("background-color","red");
      })
 
      newDivNode.mouseout(function(){//鼠标移除
       $(this).css("background-color","white");
      
       })
newDivNode.click(function(){//点击
       var comText=$(this).text();
       $("#auto").hide();
     highlightindex=-1;
     $("#word").val(comText);
       })
 
    })
    if(wordNodes.length>0){
     autoNode.show();
    }else{
     autoNode.hide();
     highlightindex=-1;
     }
   
   }else{
   autoNode.hide();
    highlightindex=-1;
    }
 
   }else if(keyCode==38||keyCode==40){
     if(keyCode==38){//向上
      var autoNodes=$("#auto").children("div");
       if(highlightindex!=-1){
        autoNodes.eq(highlightindex).css("background-color","white");
         highlightindex--;
       }else{
        highlightindex=autoNodes.length-1;
       }
       
       if(highlightindex==-1){
        highlightindex=autoNodes.length-1;
       }
       autoNodes.eq(highlightindex).css("background-color","red");
     }
     if(keyCode==40){
      var autoNodes=$("#auto").children("div");
       if(highlightindex!=-1){
        autoNodes.eq(highlightindex).css("background-color","white");
       }
       highlightindex++;
       if(highlightindex==autoNodes.length){
        highlightindex=0;
       }
       autoNodes.eq(highlightindex).css("background-color","red");
     }
   }else if(keyCode==13){
     
    if(highlightindex!=-1){
     var comText=$("#auto").hide().children("div").eq(highlightindex).text();
     highlightindex=-1;
     $("#word").val(comText);
     }else{
      alert("文本框中的【"+$("#word").val()+"】被提交了");
      $("#auto").hide();
       $("#word").get(0).blur();//失去焦点
     }
    }
  });
 
  $("input [type='button']").click(function(){
   alert("文本框中的【"+$("#word").val()+"】被提交了");
  });
 
 
})
</script>
 </HEAD>
 
 <BODY>
 <input type="text" id="word">
<input type="button" value="提交">
<div id="auto"></div>
<p>
<span>aaa</span>
<span>abc</span>
<span>abd</span>
<span>bbc</span>
<span>beb</span>
<span>cer</span>
<span>erd</span>
<span>beg</span>
<p>
 </BODY>
</HTML>

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The above is the entire content of this article. I hope it will be helpful to everyone in learning javascript programming.