selectdate.js

HTNL做的光晕特效

function displaydate(myYear, myMonth, myDate ) {
  var i,j,k,l;
  monthDates = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  monthDates2 = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  var newDateLen;
  var oldDateLen = myDate.length;
  var yy = myYear.options[myYear.selectedIndex].value
  var mm = myMonth.options[myMonth.selectedIndex].value
  var dd = myDate.options[myDate.selectedIndex].value
  if( checkPeakYear(yy) == true){ newDateLen = monthDates2[mm-1] }
  else { newDateLen = monthDates[mm-1] }
  if ( newDateLen < oldDateLen ) {
     for ( k=oldDateLen ; k>newDateLen; k--){
	if(myDate.options[k-1].selected)	myDate.options[newDateLen-1].selected=true;
     	myDate.options[k-1] = null;
     }
  }
  else if(newDateLen > oldDateLen ){
     for(l=0;l<oldDateLen && !myDate.options[l].selected; l++){;}
     for(k=oldDateLen; k<newDateLen; k++){
		newOption = new Option(k+1, k+1, false, false);
		myDate.options[k] = newOption;
	}
     myDate.options[l].selected=true;
  }
}
function displaydateForMix(myYear, myMonth, myDate ) {
  var i,j,k,l;
  monthDates = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  monthDates2 = [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  var newDateLen;
  var oldDateLen = myDate.length;
  var yy = myYear.options[myYear.selectedIndex].value
  var mm = myMonth.options[myMonth.selectedIndex].value
  var dd = myDate.options[myDate.selectedIndex].value
  var yyNoVal = false
  var mmNoVal = false
  if(isNaN(parseInt(yy)) || parseInt(yy)<=0 ) yyNoVal = true
  if(isNaN(parseInt(mm)) || parseInt(mm)<=0 ) mmNoVal = true
  if(yyNoVal || mmNoVal) {
  	if(!mmNoVal) {newDateLen = monthDates[mm-1] }
  	else newDateLen = monthDates[0]
  }
  else {
  	if( checkPeakYear(yy) == true ){ newDateLen = monthDates2[mm-1]	}
  	else { newDateLen = monthDates[mm-1] }
  }
  newDateLen = newDateLen + 1
  if ( newDateLen < oldDateLen ) {
     for ( k=oldDateLen ; k>newDateLen; k--){
	if(myDate.options[k-1].selected)	myDate.options[newDateLen-1].selected=true;
     	myDate.options[k-1] = null;
     }
  }
  else if(newDateLen > oldDateLen ){
     for(l=0;l<oldDateLen && !myDate.options[l].selected; l++){;}
     for(k=oldDateLen; k<newDateLen; k++){
		newOption = new Option(k, k, false, false);
		myDate.options[k] = newOption;
	}
     myDate.options[l].selected=true;
  }
}
function  validateDate(yy, mm, dd)
{
  var monthDates = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
  if( yy <=0 || mm <= 0 || mm > 12 || dd <= 0 || dd > 31 ){
  	return false
  }
   //check month dates. if month is not Feb, month dates are not changed
  if(mm != 2)
  {
     if(dd > monthDates[mm - 1]) { return false }
  }
  else {
  	//if month=2, (peak year or not)
  	isPeakYear = checkPeakYear(yy)
 
  	var maxDates = monthDates[mm-1]
  	if( isPeakYear == true ) { maxDates = 29 }
	if( dd > maxDates ) { return false }
  }
  return true
}
function checkPeakYear(yy)
{
  if(yy % 4 == 0) {
  	if( yy % 100 != 0) { return true }
  	else if( yy % 400 == 0) { return true }
  }
  return false
}
// return 1 : if date1 is later than date2
// return 0 : if date1 is equal to date2
// return -1: if date1 is earlier than date2
function compareDates(yy1, mm1, dd1, yy2, mm2, dd2)
{
	if(yy1 > yy2) {	return 1 }
	else if(yy1 < yy2) { return -1 }
	else if(yy1 == yy2){
	    if(mm1 > mm2) { return 1 }
	    else if(mm1 < mm2) { return -1}
	    else if(mm1 == mm2) {
	    	if(dd1 > dd2) {return 1}
	    	else if(dd1 < dd2) {return -1}
	    	else if(dd1 == dd2) { return 0 }
	    }
	}
}