File: ooDateTime.cls.php

<?php
###################################################################
#
# displays the date (yyyy, mm, dd) and time (hh, min, ss) dropdowns
# in a form and automagically keeps track of the user changes 
#
# The value is set in the field that is provided. It is assumed 
# the the field will be a text box or a hidden field.
#
# tried with NS and IE .. surprise ... works!!
#
# interface functions:
#   setFieldName ( frmName, fieldName ) : The formname should be
#			fully qualified. e.g., "document.frmMain.frmSub"
#			the field name where the selected date will be returned
#			( SHOULD BE THE FIRST FUNCTION CALLED )
#	- setAMPM( boolean ) : If AM/PM date needs to be displayed 
#	- setValues( yyyy, mm, dd, hh, min, ss) : If not called the
#			current datetime of the server is defaulted
#   writeJS()	: Writes the necessary JavaScript.
#
#	displayYear, displayMonth, displayMonthName, displayDay, 
#	displayHour, displayMinute, displaySecond, displayType 
#		- these are for displaying the corresponding dropdowns
#		  and can be called at the necessary place in the HTML.
#		  note: displayType will display dropdown for AM/PM.
#		    this will not be displayed if setAMPM is not 
#			set to true. by default it is false.
#
###################################################################

class ooDateTime {
	
	// this function writes all the necessary javascript code, 
	// so that everything runs fine! :)

	function writeJS() {
		
		$fs = $this->dt_fieldSuffix; 
		$frm= $this->dt_formName;
		
		$doAMPMAdjust = "";
		if ( $this->isAMPM == true ) {
			$doAMPMAdjust = 
				"hhType = $frm.type$fs [$frm.type$fs.selectedIndex].value;".
				"if ( hhType == 'AM' && hh == 12 ) hh = 0;".
				"if ( hhType == 'PM' && hh != 12 ) hh = parseInt(hh) + 12;";
		}
		
		$jsDate = Date( "Y, m - 1, d, H, i, s", $this->value);
				// weird Javascript starts month from 0!!!
			
		printf( 
			"<script language='JavaScript'>\n".
			"date$fs = new Date( $jsDate );\n".
			"\n".
			"function setField$fs () {\n".
			"	$this->dt_fieldName.value = date$fs.toLocaleString();\n".
			"}\n".
			"setField$fs();\n".
			"\n".
			"function dateChange$fs ( fieldType ) {\n".
			"	switch( fieldType ) {\n".
			"		case 'yyyy': date$fs.setFullYear( $frm.yyyy$fs [$frm.yyyy$fs.selectedIndex].value); break;\n".
			"		case 'mm':   date$fs.setMonth( $frm.mm$fs [$frm.mm$fs.selectedIndex].value - 1); break;\n".
			"		case 'dd':   date$fs.setDate( $frm.dd$fs [$frm.dd$fs.selectedIndex].value); break;\n".
			"		case 'hh':   \n".
			"		case 'type' : \n".
			"			hh = $frm.hh$fs [$frm.hh$fs.selectedIndex].value;\n".
			"			$doAMPMAdjust\n".
			"			date$fs.setHours( hh ); break;\n".
			"		case 'min':  date$fs.setMinutes( $frm.min$fs [$frm.min$fs.selectedIndex].value); break;\n".
			"		case 'ss':   date$fs.setSeconds( $frm.ss$fs [$frm.ss$fs.selectedIndex].value); break;\n".
			"	}\n".
			"	setField$fs();\n".
			"   return false;\n".
			"}".
			"</script>"
		);
				
	}

	function setFieldName( $formName, $fieldName) {
		$this->dt_fieldName = $formName.".".$fieldName;
		$this->dt_formName = $formName;
	}

	function setAMPM( $isAMPM ) {
		$this->isAMPM = $isAMPM;
	}

	function setValues( $yyyy, $mm, $dd, $hh, $min, $ss ) {
		$this->value = mktime( $hh, $min, $ss, $dd, $mm, $yyyy);
		$this->dt_yyyy = $yyyy; $this->dt_mm = $mm; $this->dt_dd = $dd;
		$this->dt_hh = $hh; $this->dt_min = $min; $this->dt_ss = $ss;

	}
	
	function displayYear() {
		$yyyy = date( "Y", $this->value);
		$this->displayList( "yyyy", 
			$this->generateArray( $yyyy - 5, $yyyy + 5), $yyyy);
	}

	function displayMonth() {
		$this->displayList( "mm", $this->generateArray( 1, 12), 
						date( "m", $this->value));
	}
	
	function displayMonthName() {
		$fs = $this->dt_fieldSuffix;
		$mm = date( "m", $this->value);
		printf( "<SELECT SIZE=1 name=mm$this->dt_fieldSuffix 
					onChange='return dateChange$fs ( \"mm\") '>\n");

		for( $i = 1; $i <= 12; $i++ ) {
			printf( "\t<OPTION VALUE=$i ");
			if ( $mm == $i ) {
				printf( "SELECTED" );
			}
			printf( ">%s</OPTION>\n", 
						date( 'F', mktime( 1, 1, 1, $i, 1, 2000)));
		}
		printf( "</SELECT>\n");
	}

	function displayDay() {
		$dd = date( "d", $this->value);
		$this->displayList( "dd", $this->generateArray( 1, 31), $dd);
	}

	function displayHour() {
		if ( $this->isAMPM == true ) {
			$this->displayList( "hh", $this->generateArray( 1, 12), 
						date( "h", $this->value));
		} else {
			$this->displayList( "hh", $this->generateArray( 0, 23), 
						date( "H", $this->value));
		}
	}

	function displayMinute() {
		$this->displayList( "min", $this->generateArray( 0, 59), 
						date( "i", $this->value));
	}

	function displaySecond() {
		$this->displayList( "ss", $this->generateArray( 0, 59), 
						date( "s", $this->value));

	}

	function displayType() {
		if ( $this->isAMPM ) {
			$sType = date( "A", $this->value );
			$this->displayList( "type", array( "AM", "PM") , $sType);
		}
	}

#################################################################
#
# private members and variables
#
#################################################################
	var $value;				// the date value
	var $isAMPM = false;	// if the display will be in AM/PM

	var $dt_formName;
	var $dt_fieldName;
	var $dt_fieldSuffix;
	
	function ooDateTime() {
		$this->value = time();   	// by default get the current time
		$this->dt_fieldSuffix = $this->fieldSuffix();	// generate the random seed
		$this->isAMPM = false;
	}

	function displayList( $fieldPrefix, $listData, $selectedData ) {
		$fs = $this->dt_fieldSuffix;
		$fieldName=$fieldPrefix.$this->dt_fieldSuffix;
		printf( "<SELECT SIZE=1 name=$fieldName ".
					"onChange='dateChange$fs ( \"$fieldPrefix\") '>\n");

		while ( list( $k, $v) = each( $listData )) {
			printf( "\t<OPTION VALUE=$v");
			if ( $selectedData == $v ) printf( " SELECTED" );
			printf( ">$v</OPTION>\n");
		}
		printf( "</SELECT>\n");
	}
	
	function generateArray( $startNo, $endNo ) {
		$tarr = array();
		for( $i = $startNo; $i <= $endNo; $i++ ) {
			array_push( $tarr, $i);
		}
		return $tarr;
	}

	function fieldSuffix() {
        mt_srand((double) microtime() * 1000000);
        return mt_rand(10000, 99999 );
	}

}
?>