js实现键盘上下左右键选择文字并显示在文本框的方法

2019-11-20 12:32:05

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本文实例讲述了js实现键盘上下左右键选择文字并显示在文本框的方法。分享给大家供大家参考。具体实现方法如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"><title>SimulateUpDownKeySelect.html</title><style type="text/css">#divSelect {border:1px solid red; width:208px !important;width:210px;}#divSelect ul {width:200px;margin:3px; margin-left:-35px;*margin-left:3px;overflow:hidden}#divSelect ul li {float:left; list-style-type:none;width:45px;height:14px;line-height:20px;font:14px arial;text-align:center;padding:2px}#divSelect li:hover {background :green;cursor:pointer}#txtInput {width:205px;}</style> </head> <body><form method="post" action="##"><input type="text" id="txtInput" value="" autocomplete="off" onkeydown="if(event.keyCode==13)return false;" /><!--防止回车键触发表单提交onKeyPress--><div id="divSelect"></div><script type="text/javascript">var list="<ul>"list+="<li>科幻片</li><li>战争片</li><li>动作片</li><li>爱情片</li><li>剧情片</li><li>记录片</li><li>综艺片</li><li>喜剧片</li><li>动画片</li><li>励志片</li><li>恐怖片</li><li>古装片</li><li>电视剧</li><li>读书</li><li >小说</li><li>作品集</li><li>历史</li><li>诗歌</li><li >散文</li><li>军事</li>";list+="</ul>"document.getElementById('divSelect').innerHTML=list;</script></form><script type="text/javascript"><!--function $(sId){  return document.getElementById(sId);}function clearSelectedOptBgColor(target){  if (target.seletedIndex >= 0)    target.options[target.seletedIndex].style.background = "";}function setSelectedOptBgColor(target){  target.options[target.seletedIndex].style.background = "green";}var upKeyCode = 38;var downKeyCode = 40;var enterKeyCode = 13;var oInput = $("txtInput");oInput.options = $("divSelect").getElementsByTagName("li");oInput.seletedIndex = -1;oInput.focus();//oInput.onKeyPress{}oInput.onkeyup = function(event){  if (event == undefined)    event = window.event;  switch (event.keyCode)  {    case 37:      clearSelectedOptBgColor(this);      this.seletedIndex--;      if (this.seletedIndex < 0)        this.seletedIndex = this.options.length - 1; this.value = this.options[this.seletedIndex].innerHTML;      setSelectedOptBgColor(this);      break;      case 38:      clearSelectedOptBgColor(this);      this.seletedIndex= this.seletedIndex-4;      if (this.seletedIndex < 0)        this.seletedIndex = this.options.length - 1; this.value = this.options[this.seletedIndex].innerHTML;      setSelectedOptBgColor(this);      break;    case 39:      clearSelectedOptBgColor(this);      this.seletedIndex++;      if (this.seletedIndex >= this.options.length)        this.seletedIndex = 0;      this.value = this.options[this.seletedIndex].innerHTML;      setSelectedOptBgColor(this);      break;      case 40:      clearSelectedOptBgColor(this);      this.seletedIndex= this.seletedIndex+4;      if (this.seletedIndex >= this.options.length)        this.seletedIndex = 0;      this.value = this.options[this.seletedIndex].innerHTML;      setSelectedOptBgColor(this);      break;     case enterKeyCode:      this.value = this.options[this.seletedIndex].innerHTML;      //alert('aa')      break;  }};oInput.onblur = function(){  clearSelectedOptBgColor(this);  this.seletedIndex = 1;};//--></script></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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