javascript实现的使用方向键控制光标在table单元格中切换

效果截图：

html 代码：


代码如下:

<!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>
<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：


代码如下:

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);
}
}