<select> question...

[tefuzz]

I have a form. It has 4 different <select> in it. If the lists are all valid (an item is selected) but there are other errors, how would I make PHP keep the selection when the page refreshes to show the fields with errors.  Right now my <select> are borught in by a function like this:

 

function getDays ($name, $tabIndex) {
echo ("\n\n<select name=\"$name\" id=\"$name\" tabindex=\"$tabIndex\">\n  <option selected=\"day\" value=\"\">");
 $days = array ("1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
				"11", "12", "13", "14", "15", "16", "17", "18", "19", "20",
				"21", "22", "23", "24", "25", "26", "27", "28", "29", "30",
				"31");
 foreach ($days as $day) {
	 echo("\n\t<option value=\"$day\">$day</option>");
 }
 echo ("\n</select>");
}

[alphanumetrix]

This should work, but may not depending on your particular situation.

 

function getDays ($name, $tabIndex) {
echo ("\n\n<select name=\"$name\" id=\"$name\" tabindex=\"$tabIndex\">\n  <option selected=\"day\" value=\"\">");
 $days = array ("1", "2", "3", "4", "5", "6", "7", "8", "9", "10",
				"11", "12", "13", "14", "15", "16", "17", "18", "19", "20",
				"21", "22", "23", "24", "25", "26", "27", "28", "29", "30",
				"31");

if ($_POST[$name])
$extra = 'selected';

 foreach ($days as $day) {
	 echo("\n\t<option value=\"$day\" $extra>$day</option>");
 }
 echo ("\n</select>");
}

[Axeia]

function getDays ($name, $tabIndex) {
    echo "\n\n"."<select name='$name' id='$name' tabindex='$tabIndex'>";
    for( $i = 1; $i <= 31; $i++ )
    {
        echo sprintf( "\n\t".'<option %svalue="%s">%s</option>',
            isset( $_GET[$name] ) && $_GET[$name] == $i ? 'selected="selected" ' : '', 
            $i, 
            $i );
    }
    echo "\n</select>";
}

 

I guess, going by http://www.w3schools.com/TAGS/att_option_selected.asp

[Yesideez]

You can do this with only a couple lines.

 

Define your array at the start of the script and make a function:

function makeSelect($arrOptions,$sel,$name) {
  echo '<select name="'.$name.'">';
  foreach ($arrElement as $e) {
    echo '<option value="'.$e.'"'.($e==$sel ? ' selected' : '').'>'.$e.'</option>';
  }
  echo '</select>';
}

 

Or if you want to use keys:

function makeSelectWithKey($arrOptions,$sel,$name) {
  echo '<select name="'.$name.'">';
  foreach ($arrElement as $k => $e) {
    echo '<option value="'.$k.'"'.($k==$sel ? ' selected' : '').'>'.$e.'</option>';
  }
  echo '</select>';
}

 

$arrOptions: This is your array containg all your data

$sel: This is the option selected by the user

$name: This is the name of the select

 

$userdays=$_POST['days'];
makeSelect($days,$userdays,'days');

[Yesideez]

Forgot to mention - you can build an array called $days with the range() function to save typing them all in

 

$days=range(1,31);

[Axeia]

Mmmh range() .. didn't know that one

btw, in the solution I posted if you're going to use it for differents months you may want to make the the hardcoded 31 an optional parameter, so:

function getDays ( $name, $tabIndex, $totDays = 31 /*<- Optional param, defaults to 31 if ommited*/) {
    echo "\n\n"."<select name='$name' id='$name' tabindex='$tabIndex'>";
    for( $i = 1; $i <= $totDays /*<- There it is!*/; $i++ )
    {
        echo sprintf( "\n\t".'<option %svalue="%s">%s</option>',
            isset( $_GET[$name] ) && $_GET[$name] == $i ? 'selected="selected" ' : '', 
            $i, 
            $i );
    }
    echo "\n</select>";
}