// datefunction.js // // include using the following line in your HTML: // // // to use the calendar popup, add the following code: // // click for calendar entry // // to validate dates, include the following in your validation routine: // strError = DateValidate(theForm.fldName.value); // if ( strError.length != 0) // { alert(strError); // theForm.fldName.focus(); // return (false); // } // // var months = new Array("January","February","March","April","May","June","July","August","September","October","November","December") var totalDays = new Array(31,28,31,30,31,30,31,31,30,31,30,31) var curForm var curField function openCalWin(inDate, inForm, inField) { var y, m, calYear, calMonth var today = new Date(); stats='toolbar=no,location=no,directories=no,status=no,menubar=no,'; stats += 'scrollbars=no,resizable=no,width=225,height=200'; CalWin = window.open ("","Calendar",stats); y = parseInt(inDate.substr(0,4),10); m = parseInt(inDate.substr(5,2),10); if (isNaN(y) || y <= 0) calYear = today.getFullYear() else calYear = y; if (isNaN(m) || m > 12 || m <= 0) calMonth = today.getMonth() else calMonth = m - 1; curForm = inForm curField = inField theDate = new Date(calYear, calMonth, 1); buildCal_date(theDate); } function buildCal_date(theDate) { var startDay = theDate.getDay() var printDays = false var currDay = 1 var rowsNeeded = 5 // check for leapyear if (theDate.getFullYear() % 4 == 0) totalDays[1] = 29 else totalDays[1] = 28; // check for rows needed if (startDay + totalDays[theDate.getMonth()] > 35) rowsNeeded++ // write page for chosen month/year CalWin.document.write('Click a Date') CalWin.document.write('') CalWin.document.write('') CalWin.document.write('
') CalWin.document.write('\n\n\n') CalWin.document.write('\n') for (x=1; x<=rowsNeeded; x++){ CalWin.document.write('\n') for (y=0; y<=6; y++){ if (currDay == 1 && !printDays && startDay == y) printDays = true; CalWin.document.write('') if (currDay > totalDays[theDate.getMonth()]) printDays = false } else CalWin.document.write(' ') } CalWin.document.write('') } CalWin.document.write('') CalWin.document.write('
 ' + months[theDate.getMonth()] + ' ' + theDate.getFullYear() + ' 
SuMoTuWeThFrSa
'); if (printDays){ CalWin.document.write('' + currDay++ + '
< > - months
<< >> - years.
') CalWin.document.close() } function getNewCal_date(newDir) { if (newDir == -1){ theDate.setMonth(theDate.getMonth() - 1) if (theDate.getMonth() == 0){ theDate.setMonth(12) theDate.setFullYear(theDate.getFullYear() - 1) } } else if (newDir == 1){ theDate.setMonth(theDate.getMonth() + 1) if (theDate.getMonth() == 13){ theDate.setMonth(1) theDate.setFullYear(theDate.getFullYear() + 1) } } else if (newDir == -12) theDate.setMonth(theDate.getMonth() - 12) else if (newDir == 12) theDate.setMonth(theDate.getMonth() + 12) CalWin.document.clear(); buildCal_date(theDate); } function Dret_date(monthNum, dayNum, yearNum){ var strMonth var strDay if (monthNum + 1 <10) strMonth = "0" + (monthNum + 1); else strMonth = (monthNum + 1); if (dayNum < 10) strDay = "0" + dayNum; else strDay = dayNum; var dateString = yearNum + '/' + strMonth + '/' + strDay document.forms[curForm].elements[curField].value = dateString dirty=true; CalWin.close() } // function to validate a date - return message (blank if valid.) function DateValidate(strDate) { // check for valid date. var y, m, d, strError strError = ""; if (strDate.length != 0) { if (strDate.length != 10) strError = "Date must be in format 'YYYY/MM/DD' (eg 2002/05/17)."; else { y = parseInt(strDate.substr(0,4),10); m = parseInt(strDate.substr(5,2),10); d = parseInt(strDate.substr(8,2),10); if (isNaN(y) || isNaN(m) || isNaN(d)) strError = "Date must be in format 'YYYY/MM/DD' (eg 2002/05/17)."; else { if (m > 12 || m < 01) strError = "Invalid Month. Please use format 'YYYY/MM/DD'."; if (m == 2) { if (y % 4 != 0) { if (d > 28) strError = "Invalid Date. (only 28 days in February)"; } else { if (d > 29) strError = "Invalid Date. (only 29 days in February)"; } } if ((m == 4 || m == 6 || m == 9 || m == 11) && d > 30) strError = "Invalid Date. (only 30 days in this month)"; if (d > 31 || d < 1) strError = "Invalid Date. (use days from 1 - 31)"; } } } return strError; }