本文實例講述了js實現鍵盤上下左右鍵選擇文字並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：
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 <!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。