Week Calendar PREV and NEXT

Robert Granlund
Robert Granlund used Ask the Experts™
on
OK, I give up!  I'm not sure what I am doing wrong!

I have the following script that determines the date and shows a 1 week Calendar.
The Next Week Button and the PREV week button work 100%.  However, depending on the day, there is a query that pulls information from a DB and displays it on the correct date. This also works 100%.  However, when I click NEXT or PREVIOUS the Calendar itself does not change date. (At line 38)

function weekCalendar($date='Today')	{  //  METHOD
    $pdo = new PDO("");
	$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
	
	
	
    $timestamp      = strtotime(date('Y-m-01', strtotime($date)));
    $caption     	= date("F Y", $timestamp);

	
	$date = !empty($_GET['d']) ? $_GET['d'] : 'Today';
	
	$ts = !empty($_GET['d']) ? strtotime($_GET['d']) : strtotime('Today');
	
	if (!$ts) $ts = strtotime('Today');
	$prev = date('Y-m-d', $ts - 60*60*24*7);
	$next = date('Y-m-d', $ts + 60*60*24*7);

	$prev_link = '<a href="' . $_SERVER['PHP_SELF'] . "?d=$prev" . '">Prev</a>' . PHP_EOL;
	$next_link = '<a href="' . $_SERVER['PHP_SELF'] . "?d=$next" . '">Next</a>' . PHP_EOL;
	
	$date_adv = date('Y-m', $ts);

?>

<table id="cal_nav">
	<tr>
		<td class="cal-nav-left"><h2><?php echo $prev_link; ?></h2></td>
		<td class="cal-nav-center"><h2><?php echo date('F Y', strtotime($date)); ?></h2></td>
		<td class="cal-nav-right"><h2><?php echo $next_link; ?></h2></td>
	</tr>
</table>

<?php	
    echo PHP_EOL;
	echo "<table class='full'><tr>";
	
	for($day=1; $day<=7; $day++) {
		echo '<td class="align-top"><strong>' .date('D M d', strtotime($date_adv.'-'.$day)).'</strong><br />';
		
		$this_date = date('Y-m-d', strtotime($date_adv.'-'.$day));
		echo $this_date;
		
		$sql = "SELECT schedule_id, first_name, last_name, asset_name, asset_type, start_date, workorder_id, color
				FROM schedule
				WHERE start_date = '$this_date'
				GROUP BY schedule_id DESC";

		$pdos = $pdo->prepare($sql, array(PDO::ATTR_CURSOR => PDO::CURSOR_SCROLL));
		
		try{
			$pdos->execute();
			
			if ($pdos) {
				while ($row = $pdos->fetch(PDO::FETCH_OBJ)) {
					$at = $row->asset_type;
					$fn = $row->first_name;
					$ln = $row->last_name;
					$sd = $row->start_date;
					$id = $row->schedule_id;
					$ac = $row->color;
 
					
					if ($sd == $this_date && $at == 'driver') {
						
						echo '<a href="view_workorder_print.php?id='.$id.'">'.$fn .''. $ln .'</a><br />';
						} 
					
				}  //  END WHILE
				
			}  //  END IF
			
			
		}  //  END TRY			          	
		catch(PDOException $e) {
   			echo 'ERROR: ' . $e->getMessage();
		}
		echo "<td>";	
	}  //  END FOR
	echo "</tr></table>";
		
	}
//  END WEEK CAKENDAR
}

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Most Valuable Expert 2011
Top Expert 2016

Commented:
Is this on a public-facing server where we can see the rendered HTML document?  If no, can you please put it in a test environment so we can see it in action?  Thanks, ~Ray
Most Valuable Expert 2011
Top Expert 2016

Commented:
I think you want to follow the $this_date variable in the logic.  Not sure about that but it's getting late in the day here.  If you look at the PHP code and the generated HTML document closely, you may find that the HTML is not what you expected from running the PHP.  In particular, the HTML document starts with this:
</tr></table>


		
	}
//  END WEEK CAKENDAR
}
?><!DOCTYPE html>

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Most Valuable Expert 2011
Top Expert 2016
Commented:
See if this is helpful.  It should work correctly even across leap year and daylight saving time.  Please post back if you still have questions, thanks.

<?php // RAY_temp_rgranlund.php
error_reporting(E_ALL);


// DEMONSTRATE PREVIOUS AND NEXT WEEKS
// SEE http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_28315321.html


// SET THE TIMEZONE
date_default_timezone_set('America/Chicago');

// IF THERE IS A URL ARGUMENT, USE IT PREFERENTIALLY, OR USE TODAY
$ts = !empty($_GET['d']) ? strtotime($_GET['d']) : FALSE;
if (!$ts) $ts = strtotime('TODAY');

// NORMALIZE TO THE ISO-8601 DATE WITHOUT TIME
$ymd = date('Y-m-d', $ts);
$day = date('D', $ts);

// THE WEEKLY CALENDAR WILL START ON SUNDAY
if ($day == 'Sun')
{
    $alpha = $ymd;
}
else
{
    $alpha = date('Y-m-d', strtotime($ymd . ' LAST SUNDAY'));
}

// THE WEEKLY CALENDAR WILL END ON SATURDAY
$omega = date('Y-m-d', strtotime($alpha . ' SATURDAY'));

// THE PREV AND NEXT WEEKS WILL BE COMPUTED FROM THE CURRENT DAY
$prev  = date('Y-m-d', strtotime("$ymd - 1 WEEK"));
$next  = date('Y-m-d', strtotime("$ymd + 1 WEEK"));

// MAKE THE URLS
$prev_uri = $_SERVER['PHP_SELF'] . "?d=$prev";
$next_uri = $_SERVER['PHP_SELF'] . "?d=$next";

// MAKE THE LINK TEXTS
$prev_lnk = '<a href="' . $prev_uri . '">Prev</a>';
$next_lnk = '<a href="' . $next_uri . '">Next</a>';

// MAKE THE REPRESENTATION OF THE WEEK
$week['prev'] = $prev_lnk;
while ($alpha <= $omega)
{
    // A TEXT VERSION OF THE WEEKDAY
    $day = date('D', strtotime($alpha));

    // HIGHLIGHT THE CURRENT DAY
    if ($alpha == $ymd)
    {
        $week[$day] = "<b>$alpha</b>";
    }
    else $week[$day] = $alpha;
    $alpha = date('Y-m-d', strtotime("$alpha + 1 DAY"));
}
$week['next'] = $next_lnk;

// SHOW THE REPRESENTATION OF THE WEEK
echo '<pre>';
print_r($week);

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HTH, ~Ray

Author

Commented:
@Ray.  I was able to edit it into what I needed.  So strange.  I looked all over the internet for an example of how to do this, to no real avail.  Thanks again!
Most Valuable Expert 2011
Top Expert 2016

Commented:
Glad to be able to help!  Thanks, ~Ray

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