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javascript实现的使用方向键控制光标在table单元格中切换

2010-11-17 00:00 716 查看

效果截图：

html 代码：

<!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> 
<title>选择货架号</title> 
<script type="text/javascript" src="01.js"></script> 
<style type="text/css"> 
#table1 td { 
text-align:center; 
width:15%; 
} 
#table2 td { 
text-align:center; 
width:15%; 
background-color:#dcdcdc; 
cursor:pointer; 
} 
</style> 
<body> 
<table id="table1" border="0" cellpadding="1" cellspacing="1" style="width: 100%"> 
<tr> 
<td>货架</td> 
<td>一层</td> 
<td>二层</td> 
<td>三层</td> 
<td>四层</td> 
<td>五层</td> 
</tr> 
</table> 
<table id="table2" border="0" cellpadding="1" cellspacing="1" style="width:100%;"> 
<tr> 
<td style="background-color:#ffffff;">A001</td> 
<td id="td0" title="A001-1|11" style="background-color:#6699FF;"></td> 
<td id="td1" title="A001-2|12" ></td> 
<td id="td2" title="A001-3|13" ></td> 
<td id="td3" title="A001-4|14"></td> 
<td id="td4" title="A001-5|15"></td> 
</tr> 
<tr> 
<td style="background-color:#ffffff;">A002</td> 
<td id="td5" title="A002-1|21"></td> 
<td id="td6" title="A002-2|22"></td> 
<td id="td7" title="A002-3|23"></td> 
<td id="td8" title="A002-4|24"></td> 
<td id="td9" title="A002-5|25"></td> 
</tr> 
<tr> 
<td style="background-color:#ffffff;">A003</td> 
<td id="td10" title="A003-1|31"></td> 
<td id="td11" title="A003-2|32"></td> 
<td id="td12" title="A003-3|33"></td> 
<td id="td13" title="A003-4|34"></td> 
<td id="td14" title="A003-5|35"></td> 
</tr> 
<tr> 
<td style="background-color:#ffffff;">A004</td> 
<td id="td15" title="A004-1|41"></td> 
<td id="td16" title="A004-2|42"></td> 
<td id="td17" title="A004-3|43"></td> 
<td id="td18" title="A004-4|44"></td> 
<td id="td19" title="A004-5|45"></td> 
</tr> 
<tr> 
<td style="background-color:#ffffff;">A005</td> 
<td id="td20" title="A005-1|51"></td> 
<td id="td21" title="A005-2|52"></td> 
<td id="td22" title="A005-3|53"></td> 
<td id="td23" title="A005-4|54"></td> 
<td id="td24" title="A005-5|55"></td> 
</tr> 
</table> 
</body> 
</html>

javascript 代码：

var tdnum = 0; 
var trid = "td"; 
// 键盘事件 
document.onkeydown = function(event){ 
// 兼容 Mozilla Firefox 
if (null == event) { 
event = window.event; 
} 
if (event.keyCode == 13) { 
p13key(); 
} 
else if (event.keyCode <= 40 && event.keyCode >= 37) { 
keytd(event.keyCode); 
} 
} 
// 按下回车键 
function p13key(){ 
var tdid = trid + tdnum; 
var tdtitle = document.getElementById(tdid).getAttribute("title"); 
var pos = tdtitle.indexOf("|"); 
var seatname = tdtitle.substring(0, pos); 
var seatid = tdtitle.substring(pos + 1, tdtitle.length); 
window.alert(seatname + "," + seatid); 
} 
// 变换颜色 
function setcolor(oldtd, newtd){ 
document.getElementById(oldtd).style.backgroundColor="#dcdcdc"; 
document.getElementById(newtd).style.backgroundColor="#6699FF"; 
} 
// 实现切换功能主要代码 
function keytd(key){ 
// 左 
if (key == 37) { 
--tdnum; 
if (null == document.getElementById(trid + tdnum)) { 
tdnum++; 
return; 
} 
setcolor(trid + (tdnum + 1), trid + tdnum); 
} 
// 右 
else if (key == 39) { 
++tdnum; 
if (null == document.getElementById(trid + tdnum)) { 
tdnum--; 
return; 
} 
setcolor(trid + (tdnum - 1), trid + tdnum); 
} 
// 上 
else if (key == 38) { 
tdnum = tdnum - 5; 
if (null == document.getElementById(trid + tdnum)) { 
tdnum = tdnum + 5; 
return; 
} 
setcolor(trid + (tdnum + 5), trid + tdnum); 
} 
// 下 
else if (key == 40) { 
tdnum = tdnum + 5; 
if (null == document.getElementById(trid + tdnum)) { 
tdnum = tdnum - 5; 
return; 
} 
setcolor(trid + (tdnum - 5), trid + tdnum); 
} 
}

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