关于日期输入，现在网上的日期控件很多，在这里，我试着模仿了部分CS程序中的日期输入控件，从另一个角度来考虑日期格式的输入，即输入日期时固定格式，用户只能在程序规定的地方输入数据。
例程如下，希望对大家有所帮助~~~ （时间仓促，例程是IE ONLY的）
<SCRIPT LANGUAGE="JavaScript">
/*----------------------------可以放到外部JS中，DateInputControl.js--------------------*/
/*
* Added by LiuXiaoChong 2005.4.25
* 限制输入的日期控件
* Param: txtName 为要限制输入的文本框的名称
*
* 功能描述：1，只能输入数字
* 2，左右键可以移动编辑焦点
* 3，上下键可以对数据进行微调
* 4，控件包含了对日期的合法校验
*/
function regDateControl(txtName)
{
var oInput = document.getElementById(txtName);
oInput.middleChar = "-";
oInput.selectIndex = 1; //默认选中年
oInput.maxLength = 10;
oInput.style.imeMode = "disabled";
oInput.value = specialText_GetDate(oInput.middleChar);
oInput.charWidth = oInput.createTextRange().boundingWidth / oInput.maxLength;
//注册单击事件
oInput.onclick = specialText_ClickEvent;
oInput.onkeydown = specialText_KeyDownEvent;
oInput.onfocus = function(){specialText_SelectYear(this);}
oInput.onblur = function()
{
specialText_validYear(this);
specialText_validMonth(this);
specialText_validDate(this);
}
//屏蔽鼠标右键和拖动操作
oInput.oncontextmenu = function(){return false;}
oInput.ondrop = function(){return false;}
}
//鼠标单击，根据位置对日期进行分体选择
function specialText_ClickEvent()
{
event.cancelBubble = true;
specialText_validYear(this);
specialText_validMonth(this);
specialText_validDate(this);
if(event.offsetX <= specialText_getCharWidth(this.charWidth,4))
specialText_SelectYear(this);
else if(event.offsetX > specialText_getCharWidth(this.charWidth,4)
&& event.offsetX <= specialText_getCharWidth(this.charWidth,7))
specialText_SelectMonth(this);
else if(event.offsetX > specialText_getCharWidth(this.charWidth,7))
specialText_SelectDate(this);
}
//选中年份
function specialText_SelectYear(oInput)
{
var oRange = oInput.createTextRange();
oRange.moveStart("character",0);
oRange.moveEnd("character",-6);
//代表选中了年
oInput.selectIndex = 1;
oRange.select();
}
//选中月份
function specialText_SelectMonth(oInput)
{
var oRange = oInput.createTextRange();
oRange.moveStart("character",5);
oRange.moveEnd("character",-3);
//代表选中了月
oInput.selectIndex = 2;
oRange.select();
}
//选中日期
function specialText_SelectDate(oInput)
{
var oRange = oInput.createTextRange();
oRange.moveStart("character",8);
//代表选中了日期
oInput.selectIndex = 3;
oRange.select();
}
//校验年份有效性
function specialText_validYear(oInput)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strYear = arrValue[0];
if(parseInt(strYear,10) == 0)
arrValue[0] = 2000;
//如果年份小于4位，则在2000基础上增加
else if(strYear.length < 4)
arrValue[0] = 2000 + parseInt(strYear,10);
oInput.value = arrValue.join(oInput.middleChar);
}
//校验月份有效性
function specialText_validMonth(oInput)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strMonth = arrValue[1];
//如果月份输入了0，则按1月处理
if(parseInt(strMonth,10) == 0)
arrValue[1] = "01";
//如果月份是一位，则前面补0
else if(strMonth.length < 2)
arrValue[1] = "0" + strMonth;
//如果月份大于12月，自动转为12月
else if(parseInt(strMonth,10) > 12)
arrValue[1] = "12";
oInput.value = arrValue.join(oInput.middleChar);
}
//校验日期有效性
function specialText_validDate(oInput)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strYear = arrValue[0];
var strMonth = arrValue[1];
var strDate = arrValue[2];
var intMonth = parseInt(strMonth,10);
if(parseInt(strDate,10) == 0)
arrValue[2] = "01";
else if(strDate.length < 2)
arrValue[2] = "0" + strDate;
else
{
//如果超过了月份的最大天数，则置为最大天数
var monthMaxDates = specialText_getMonthDates(strYear,strMonth);
if(parseInt(strDate,10) > monthMaxDates)
arrValue[2] = monthMaxDates;
}
oInput.value = arrValue.join(oInput.middleChar);
}
function specialText_YearAdd(oInput,isMinus)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strYear = arrValue[0];
if(isMinus)
{
arrValue[0] = parseInt(strYear,10) - 1;
if(parseInt(arrValue[0],10) < 1)
arrValue[0] = "0001";
}
else
arrValue[0] = parseInt(strYear,10) + 1;
oInput.value = arrValue.join(oInput.middleChar);
specialText_validYear(oInput);
specialText_SelectYear(oInput);
}
function specialText_MonthAdd(oInput,isMinus)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strMonth = arrValue[1];
if(isMinus)
{
arrValue[1] = parseInt(strMonth,10) - 1;
if(parseInt(arrValue[1],10) == 0)
arrValue[1] = "12";
}
else
{
arrValue[1] = parseInt(strMonth,10) + 1;
if(parseInt(arrValue[1],10) == 13)
arrValue[1] = "01";
}
oInput.value = arrValue.join(oInput.middleChar);
specialText_validMonth(oInput);
specialText_SelectMonth(oInput);
}
function specialText_DateAdd(oInput,isMinus)
{
var arrValue = oInput.value.split(oInput.middleChar);
var strYear = arrValue[0];
var strMonth = arrValue[1];
var strDate = arrValue[2];
var monthMaxDates = specialText_getMonthDates(strYear,strMonth);
if(isMinus)
{
arrValue[2] = parseInt(strDate,10) - 1;
if(parseInt(arrValue[2],10) == 0)
arrValue[2] = monthMaxDates;
}
else
{
arrValue[2] = parseInt(strDate,10) + 1;
if(parseInt(arrValue[2],10) == (monthMaxDates + 1))
arrValue[2] = "01";
}
oInput.value = arrValue.join(oInput.middleChar);
specialText_validDate(oInput);
specialText_SelectDate(oInput);
}
function specialText_KeyDownEvent()
{
//如果按了数字键
if((event.keyCode >= 48 && event.keyCode <= 57) ||
(event.keyCode >= 96 && event.keyCode <= 105))
{
var oRange = document.selection.createRange();
if(oRange.text.indexOf(this.middleChar) != -1)
event.returnValue = false;
else
event.returnValue = true;
}
//如果按了方向键
else if(event.keyCode >= 37 && event.keyCode <= 40)
{
event.returnValue = false;
var keyCode = event.keyCode;
//按了左键
if(keyCode == 37)
{
if(this.selectIndex == 1)
{
specialText_validYear(this);
specialText_SelectDate(this);
}
else if(this.selectIndex == 2)
{
specialText_validMonth(this);
specialText_SelectYear(this);
}
else if(this.selectIndex == 3)
{
specialText_validDate(this);
specialText_SelectMonth(this);
}
}
//按了右键
if(keyCode == 39)
{
if(this.selectIndex == 1)
{
specialText_validYear(this);
specialText_SelectMonth(this);
}
else if(this.selectIndex == 2)
{
specialText_validMonth(this);
specialText_SelectDate(this);
}
else if(this.selectIndex == 3)
{
specialText_validDate(this);
specialText_SelectYear(this);
}
}
//按了上键
if(keyCode == 38)
{
if(this.selectIndex == 1)
{
specialText_validYear(this);
specialText_YearAdd(this,true);
}
else if(this.selectIndex == 2)
{
specialText_validMonth(this);
specialText_MonthAdd(this,true);
}
else if(this.selectIndex == 3)
{
specialText_validDate(this);
specialText_DateAdd(this,true);
}
}
//按了下键
if(keyCode == 40)
{
if(this.selectIndex == 1)
{
specialText_validYear(this);
specialText_YearAdd(this,false);
}
else if(this.selectIndex == 2)
{
specialText_validMonth(this);
specialText_MonthAdd(this,false);
}
else if(this.selectIndex == 3)
{
specialText_validDate(this);
specialText_DateAdd(this,false);
}
}
}
//如果按了F5 或 TAB，不屏蔽
else if(event.keyCode == 116 || event.keyCode == 9)
event.returnValue = true;
else
{
event.returnValue = false;
event.keyCode = 0;
}
}
/*---------------------辅助函数-----------------------*/
//得到默认日期
function specialText_GetDate(middleChar)
{
var oDate = new Date();
return oDate.getYear() + middleChar
+ (oDate.getMonth() < 10 ? ("0" + oDate.getMonth()) : oDate.getMonth()) + middleChar
+ (oDate.getDate() < 10 ? ("0" + oDate.getDate()) : oDate.getDate());
}
//得到字符像素宽度
function specialText_getCharWidth(charWidth,charNum)
{
return charNum * charWidth;
}
//得到某年某月的最大天数
function specialText_getMonthDates(strYear,strMonth)
{
var intMonth = parseInt(strMonth,10);
if(intMonth == 1 || intMonth == 3 || intMonth == 5 || intMonth == 7
|| intMonth == 8 || intMonth == 10 || intMonth == 12)
return 31;
//处理30天的月份
else if(intMonth == 4 || intMonth == 6 || intMonth == 9 || intMonth == 11)
return 30;
//处理2月份
else
{
//闰年
if(specialText_isLeapYear(strYear))
return 29;
//平年
else
return 28;
}
}
//判断是否是闰年
function specialText_isLeapYear(strYear)
{
var intYear = parseInt(strYear,10);
if((intYear % 4 == 0 && intYear % 100 != 0) ||
(intYear % 100 == 0 && intYear % 400 == 0))
return true;
else
return false;
}
/*----------------------------可以放到外部JS中 DateInputControl.js--------------------*/
function init()
{
regDateControl('date1');
}
</SCRIPT>
<body onload="init()">
<INPUT TYPE="text" NAME="date1">
</body>
