<!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>JS方向键切换输入框焦点</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
</head>
<body>
<table border="1" id="mm" onkeydown="keyDown(event)">
<tr> <td> <input> </td> <td> <input> </td> <td> <input> </td> <td> <input> </td> </tr>
<tr> <td> <input> </td> <td> <input> </td> <td> <input> </td> <td> <input> </td> </tr>
<tr> <td> <input> </td> <td> <input> </td> <td> <input> </td> <td> <input> </td> </tr>
<tr> <td> <input> </td> <td> <input> </td> <td> <input> </td> <td> <input> </td> </tr>
<tr> <td> <input> </td> <td> <input> </td> <td> <input> </td> <td> <input> </td> </tr>
</table>
<script language="javascript" type="text/javascript">
<!--
var inputs=document.getElementById("mm").getElementsByTagName("INPUT");
function keyDown(event)
{
var focus=document.activeElement;
if(!document.getElementById("mm").contains(focus)) return;
var event=window.event||event;
var key=event.keyCode;
for(var i=0; i<inputs.length; i++)
{
if(inputs[i]===focus) break;
}
switch(key)
{
case 37:
if(i>0) inputs[i-1].focus();
break;
case 38:
if(i-4>=0) inputs[i-4].focus();
break;
case 39:
if(i<inputs.length-1) inputs[i+1].focus();
break;
case 40:
if(i+4 <inputs.length) inputs[i+4].focus();
break;
}
}
//-->
</script>
</body>
</html>
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