本文實例講述了js實現鍵盤上下左右鍵選擇文字并顯示在文本框的方法。分享給大家供大家參考。具體實現方法如下：
<!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;" /><!--防止回車鍵觸發表單提交onKeyPress--><div id="divSelect"></div><script type="text/javascript">var list="<ul>"list+="<li>科幻片</li><li>戰爭片</li><li>動作片</li><li>愛情片</li><li>劇情片</li><li>記錄片</li><li>綜藝片</li><li>喜劇片</li><li>動畫片</li><li>勵志片</li><li>恐怖片</li><li>古裝片</li><li>電視劇</li><li>讀書</li><li >小說</li><li>作品集</li><li>歷史</li><li>詩歌</li><li >散文</li><li>軍事</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>希望本文所述對大家的javascript程序設計有所幫助。
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