具体代码:

<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.0 Transitional//EN\">
<HTML>
 <HEAD>
 < > New Document </ >
 <  NAME=\"Generator\" CONTENT=\"EditPlus\">
 <  NAME=\"Author\" CONTENT=\"\">
 <  NAME=\"Keywords\" CONTENT=\"\">
 <  NAME=\"De ion\" CONTENT=\"\">
 <  type=\"text/ \" src=\"/Public/js/jquery-1.7.1.min.js\"></ >
  <  type=\"text/ \">
  /*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\");
  });
  
  
})
</ >
 </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>

在线运行

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