网页输入框日期型有效性判定一网打尽

[著者]zosatapo

[联系]dertyang@263.net

我利用正则表达式写的日期型网页输入框数据是否有效的判定函数。

包含闰年的处理，有兴趣正则表达式的同行，以及需要对网页中日期进行

很好判定的朋友可以参照一下。同时函数支持自我日期输入形式定义。

1#辅助函数（闰年判定）

function isleapyear(year)
{
 if((year%4==0&&year%100!=0)||(year%400==0))
 {
 return true;
 } 

 return false;
}

2#判定主函数

function datevalidation(object,format)
{
 var regexp,value,index;
 var year,month,day;
 var iyear,imonth,iday;
 var fmt,regfmt,ordfmt;
 var datearray;

 if(isobject(object))
 {
  value=object.value;
 }
 else if(isstring(object)&&!isempty(object))
 {
  value=object;
 }
 else
 {
  return false;
 }
 if(isempty(format))
 {
  return false;
 }

 fmt=new array("yyyy/mm/dd","mm/dd/yyyy","dd/mm/yyyy");
 
 regfmt=new array("/^([0-9]{4})\\/([0-9]{2})\\/([0-9]{2})$/","/^([0-9]{2})\\/([0-9]{2})\\/([0-9]{4})$/","/^([0-9]{2})\\/([0-9]{2})\\/([0-9]{4})$/");

 ordfmt=new array("123","312","321");

 format=format.tolowercase();
 for(index=0;index<fmt.length;index++)
 {
  if(format==fmt[index])
  { 
   eval('regexp='+regfmt[index]+';');

   iyear=parseint(ordfmt[index].charat(0));
   imonth=parseint(ordfmt[index].charat(1));
   iday=parseint(ordfmt[index].charat(2));

   break;
  }
 }
 
 if(index==fmt.length)
 {
  alert("date format not supported!");
  return false;
 }

 if(regexp.test(value)){
  //alert("date is matched with format!");
  datearray=value.match(regexp);

  year=datearray[iyear];
  month=datearray[imonth];
  day=datearray[iday];

  //alert("the date you have filled is:\nyear:"+year+"\nmonth:"+month+"\nday:"+day);
  
  if(year<2001)
  {
   alert("year must be greater than 2001!");
   return false;
  }
  if(month<0||month>12)
  {
   alert("month must range from 1 to 12!");
   return false;
  }

  if(day<0||day>31)
  {
   alert("day must range from 1 to 31!");
   return false;
  }
  else
  { 
   if(month==2)
   { 
    if(isleapyear(year)&&day>29)
    {
     alert("in month 2,day must range from 1 to 29!");
     return false;
    }
    
    if(!isleapyear(year)&&day>28)
    {
     alert("in month 2,day must range from 1 to 28!");
     return false;
    }
    
   }

   if((month==4||month==6||month==9||month==11)&&(day>30))
   {
    alert("in this month ,day must range from 1 to 30!");
    return false;
   }
  }

 }
 else
 {
  alert("date isn't matched with format!\ndate format:"+format);
  return false;
 }

 return true;
}