用户输入框日期(年月日)提醒
代码来自经典论坛 作者:hansir
根据caiying2007版主和一些朋友的建议对昨天写的一个方法进行了调整, 其实用日期控件就可以了，写这个只是多学些东西呵～，欢迎大家多提见意，共同探讨...
加了部分注释（其实挺简单所以没细加)
增加了日期格式检测, 自动加分隔符, 自动补0
对润月的支持（从别地儿看的方法）
只支持 YYYY-MM-DD格式 分隔符可以变
调用:
window.onload=function(){
net new date_help('myDate', '-'); // myDate 为输入框的ＩＤ名字，'-'为日期分格符
}
<script type="text/javascript">
/*
*** http://www.hansir.cn ***
*/
var date_help = function(inp, divide){
this.inp = document.getElementById(inp);
this.divide = divide;
this.format = 'YYYY'+divide+'MM'+divide+'DD';
//显示字符样式
this.styleH='<span style="font-weight:bold; color:green">';
this.styleB='</span>';
this.load(); // 初始化
}
date_help.prototype={
load: function(){
// 创建一个用于显示提示的DIV并设置样式
var div = document.createElement('div');
div.setAttribute('style', 'height:21px; line-height:21px;font-family:宋体; font-size:13px; letter-spacing:1px; text-align:center; background:#fffff6; color:#f60; border:1px solid #ccc; border-top:0; position:absolute; visibility:hidden');
div.style.cssText = 'height:21px; line-height:21px; font-family:宋体; font-size:13px; letter-spacing:1px; text-align:center; background:#fffff6; color:#f60; border:1px solid #ccc; border-top:0; position:absolute; visibility:hidden';
div.innerHTML = this.format;
this.div = div;
document.body.appendChild(div);
// 设置DIV的位置
var inp = this.inp;
var inpW = inp.offsetWidth, inpH = inp.offsetHeight;
var left = 0, top = 0;
while(inp != null){ // 计算输入框在页面里的坐标给提示框使用
left += inp.offsetLeft;
top += inp.offsetTop;
inp = inp.offsetParent;
}
this.div.style.height = '21px';
this.div.style.width = inpW-2 + 'px';
this.div.style.left = left + 'px';
this.div.style.top = inpH+top + 'px';
// 加载输入框事件
var oThis = this;
this.inp.onfocus = function(){
oThis.inp_v.call(oThis);
}
this.inp.onblur = function(){
oThis.inp_h.call(oThis);
}
this.inp.onkeypress = function(e){ //键盘按下事件
e?intKey=e.which:intKey=event.keyCode;
return oThis.inp_press.call(oThis, intKey);
}
this.inp.onkeyup = function(e){
e?intKey=e.which:intKey=event.keyCode;
oThis.inp_chk.call(oThis,intKey);
}
},
inp_v: function(){ // 提示信息显示
this.div.style.visibility = 'visible';
},
inp_h: function(){ // 提示信息显示
if(new RegExp('^\\d+'+this.divide+'\\d'+this.divide).test(this.inp.value)){ // 月数补0
this.inp.value = this.inp.value.replace(new RegExp('^(\\d+'+this.divide+')(\\d)(?='+this.divide+')'),'$10$2');
this.parseDate();
this.parseFormat();
}
if(new RegExp('^\\d+'+this.divide+'\\d+'+this.divide+'\\d$').test(this.inp.value)){ // 天数补0
this.inp.value = this.inp.value.replace(/(\d)$/,'0$1');
this.parseDate();
this.parseFormat();
}
this.div.style.visibility = 'hidden';
},
inp_press: function(intKey){ //键键按下事件 只接受数字和分隔符
return (new RegExp('[\\d'+this.divide+']').test(String.fromCharCode(intKey)) || (intKey==0||intKey==8));
},
inp_chk: function(intkey){ // 格式化日期及提示信息样式
if(intKey==37||intKey==39)return; // 左右键不检测
this.parseDate(intKey); // 格式化日期
this.parseFormat(); // 格式化提示信息
},
parseDate: function(intKey){ // 格式化日期
var intDate = this.inp.value.replace(/\s/g,'');
var divide=this.divide;
var strDateArray = intDate.split(divide);
strDateArray[0]?intYear = strDateArray[0].replace(/^(\d*).*$/,'$1'):intYear='';
strDateArray[1]?intMonth = strDateArray[1].replace(/^(\d*).*$/,'$1'):intMonth='';
strDateArray[2]?intDay = strDateArray[2].replace(/^(\d*).*$/,'$1'):intDay='';
if((intKey==8 || intKey==46) && (!strDateArray[0]||strDateArray[0].length<5)&&(!strDateArray[1] || strDateArray[1].length<3) && (!strDateArray[2]||strDateArray[2].length<3))return intDate; // 退格键检测
isNaN(intYear)?intYear='':intYear=intYear.slice(0,4);
isNaN(intMonth)?intMonth='':intMonth=intMonth.slice(0,2);
isNaN(intDay)?intDay='':intDay=intDay.slice(0,2);
// 判断在修改阶段
if(intYear.length<4 && (intMonth!='' || intDay!='')){
if(strDateArray[1].length<3 && strDateArray[2]<3)return intDate;
}
if(intMonth.length<2 && intDay!=''){
if(strDateArray[0].length<4 && strDateArray[2]<3)return intDate;
}
if(intMonth.slice(0,1)>1)intMonth='0'+intMonth.slice(0,1);
if(intMonth>12){
var m='0'+intMonth.slice(0,1);
var d=intMonth.slice(1,2);
intMonth = m;
if(intDay=='')intDay=d;
}
var intM=Number(intMonth);
if(intM == 1 || intM == 3 || intM == 5 || intM == 7 || intM == 8 || intM == 10 || intM == 12){
if(intDay.slice(0,1)>3)intDay='0'+intDay.slice(0,1);
intDay>31?intDay=intDay.slice(0,1):'';
}
if(intM == 4 || intM == 6 || intM == 9 || intM == 11){
if(intDay.slice(0,1)>3)intDay='0'+intDay.slice(0,1);
parseInt(intDay)>30?intDay=intDay.slice(0,1):'';
}
if(intM == 2){
boolLeapYear = false;
if ((intYear % 100) === 0) {
if ((intYear % 400) === 0) {
boolLeapYear = true;
}
} else {
if ((intYear % 4) === 0) {
boolLeapYear = true;
}
}
if (boolLeapYear) {
if(intDay.slice(0,1)>2)intDay='0'+intDay.slice(0,1);
} else {
if(intDay.slice(0,1)>2)intDay='0'+intDay.slice(0,1);
if (intDay > 28)intDay=intDay.slice(0,1);
}
}
temDate = '';
if(intYear!='')intYear.length==4 ? temDate = intYear + divide : temDate = intYear;
if(intMonth!='')intMonth.length==2 ? temDate = intYear + divide + intMonth + divide : new RegExp('\\d+'+divide+'\\d+'+divide).test(intDate) ? temDate=intYear+divide+'0'+intMonth+divide:temDate = intYear + divide + intMonth;
if(intDay!='')temDate=intYear+divide+intMonth+divide+intDay;
this.inp.value=temDate;
return temDate;
},
parseFormat: function(){ //格式化提示信息
var intDate = this.inp.value;
if(!intDate){
this.div.innerHTML=this.format;
return;
}
var format = this.format; // 提示字符
var divide = this.divide;
var uarr = intDate.split(divide), farr = format.split(divide) // 用户输入的字符分组
var styleH = this.styleH, styleB = this.styleB;
var y=farr[0], m=farr[1], d=farr[2]; // 年, 月, 日
if(uarr!='')y=styleH+y.slice(0,uarr[0].length)+styleB+y.slice(uarr[0].length,y.length);
if(uarr[1]!='' && uarr[1]!=null){
m=styleH+divide+m.slice(0,uarr[1].length)+styleB+m.slice(uarr[1].length,m.length);
}else{
new RegExp('\\d*'+divide).test(intDate)?m=styleH+divide+styleB+m:m=divide+m;
}
if(uarr[2]!=''&&uarr[2]!=null){
d=styleH+divide+d.slice(0,uarr[2].length)+styleB+d.slice(uarr[2].length,d.length);
}else{
new RegExp('\\d*?'+divide+'\\d*?'+divide).test(intDate)?d=styleH+divide+styleB+d:d=divide+d;
}
this.div.innerHTML= y+m+d;
}
}
</script>