通过上下键调整数字大小（摘自Javascript高级程序设计）

<html>

<head>

var TextUtil = new Object();

TextUtil.allowChars = function(oTextbox,oEvent)

{

var sAllowChars = oTextbox.getAttribute("allowChars");

var sChar = String.fromCharCode(oEvent.keyCode);

var bAllowChar = sAllowChars.indexOf(sChar) > -1;

return bAllowChar || oEvent.ctrlKey;

}

TextUtil.numbericScroll = function (oTextbox,oEvent)

{

var iValue = oTextbox.value.length ==0 ?0:parseInt(oTextbox.value);

var iMax = parseInt(oTextbox.getAttribute("max"));

var iMin = parseInt(oTextbox.getAttribute("min"));

if((oEvent.keyCode == 38)&&(iValue < iMax))

{

oTextbox.value = iValue+1;

}

else if((oEvent.keyCode == 40)&& (iValue > iMin))

{

oTextbox.value = iValue-1;

}

</script>

</head>

<body>

<input type="text" title="可使用上下键调整数字大小（0至99之间）" maxlength="2" size="12" max="99" min="0" allowChars="0123456789"

onkeypress="return TextUtil.allowChars(this,event)"

onkeydown="TextUtil.numbericScroll(this,event)" />

</body>

</html>

posted on 2007-07-17 22:33 傲雪凌峰阅读(422) 评论(0) 收藏举报