forms

Beginners - Learning PHP
#1

I need to show selected value after pressing “Submit”-button. I cannot succeed with the first field. Can someone find the solution? I have tried several approaches. One of them is here, too (line 21).
[php]

Peatused <?php $peatused=array("esimene", "teine", "kolmas", "neljas", "viies", "kuues", "seitsmes", "kaheksas"); //echo "teine element: ".$peatused[6]; ?>

Vali peatus ja mitu peatust selle ümber kuvada

Vali peatus // > esimene teine kolmas neljas viies kuues seitsmes kaheksas
/>
<?php 
if(!empty($_POST)) { // vorm esitati
	$errors=array();
	if(!empty($_POST["peatus"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatus!";
	}
	if(!empty($_POST["range"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatuste arv!";
	}		
}
	?>


<?php if (!empty($errors)): ?>
	<?php foreach($errors as $e): ?>
		<p style="color:red"> <?php echo $e; ?> </p>
	<?php endforeach?>
<?php endif;?>


</body>
[/php]
#2

Hello Rene,

On line 21,

//<option <?php if($_POST["peatus"]==$peatused[0]) echo "value=\"{$peatused[0]}\""; ?> > esimene</option>

I think an if statement would do

<?php
   if(isset($_POST['peatus']))
    {
?>
<option <?php if($_POST["peatus"]==$peatused[0]) echo "value=\"{$peatused[0]}\""; ?> > esimene</option>

<?php
     }
?>
#3
[php] > esimene[/php]
What exactly is the point of this anyway? You accomplish the SAME THING doing this, [php] esimene[/php]

So, why complicate it? Unless you are actually trying to do something more like this, and haven’t worked out how?
[php]
for( $i = 0; $i < count( $peatused ); $i++ )
echo “{$peatused[ $i ]}\n”;
[/php]

#4

Thank you!
Here’s my new solution. I still have one problem to solve. In the first field, I ecpect the selected (default) value to be “Vali peatus”. But right now it’s “esimene”. Could someone find the problem?
[php]

Peatused <?php $peatused=array("esimene", "teine", "kolmas", "neljas", "viies", "kuues", "seitsmes", "kaheksas"); ?>

Vali peatus ja mitu peatust selle ümber kuvada

			 <?php
            echo "<option selected value=\"\">Vali peatus</option>";
			 for( $i = 0; $i < count($peatused); $i++ ) { 
                 if($i == array_search($_POST['peatus'], $peatused)) { 
                    $selected = "selected";
                 }else{
                     $selected = "";
                 }
                     echo "<option value=\"$peatused[$i]\" ".$selected.">$peatused[$i]</option>";                                                    
            }
			 ?>				 				 
		</select>
		<br/>
		<input type="number" name="range" <?php if(!empty($_POST["range"]) && is_numeric($_POST["range"])) 
	echo "value=\"".htmlspecialchars($_POST["range"])."\" "; ?> /><br/>
		<input type="submit" value="kuva"/>
	</form>
	
<?php 
if(!empty($_POST)) { // vorm esitati
	$errors=array();
	if(!empty($_POST["peatus"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatus!";
	}
	if(!empty($_POST["range"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatuste arv!";
	}		
}
	?>


<?php if (!empty($errors)): ?>
	<?php foreach($errors as $e): ?>
		<p style="color:red"> <?php echo $e; ?> </p>
	<?php endforeach?>
<?php endif;?>


</body>
[/php]
#5

Use code tags please, it is the button that says “php” over the smiley faces.

Where are the values for the dropdown coming from? Here:
[php] $peatused=array(“esimene”, “teine”, “kolmas”, “neljas”, “viies”, “kuues”, “seitsmes”, “kaheksas”);[/php]

“Vali peatus” is not in that list. If you want it to be the default, You need to add it to location 0 in the array.

This:

[php]if($i == array_search($_POST['peatus'], $peatused)) { [/php]

Will likely cause a warning. If the form hasn’t been submitted, that value is not set.

#6

I personally like using foreach statements instead of for loops for they look neater in my opinion.

[php]foreach ($peatused as $key => $value) {
if (in_array($_POST[‘peatus’], $peatused) {
$selected = ‘selected’;
} else {
$selected = “”;
}
echo “<option value=”$peatused[$key]" “.$selected.”>$peatused[$key]";
} [/php]

I can’t guarantee that this work for I haven’t tested it. Just a different way of doing it.

#7

Won’t work, or actually it will work too well. It loops through the array, so every value will be in the array, resulting in every item having a selected attribute.

#8

This should work the same though:

[php]foreach ( $peatused as $key => $value ) {
if ($key == array_search($_POST[‘peatus’], $peatused) )
{
$selected = ‘selected’;
} else
{
$selected = “”;
}
echo “<option value=”$key" " . $selected . “>$value”;
} [/php]

#9

Thank you, astonecipher and Strider64! Your comments were helpful!

#10

What is the purpose of range? I am seeing an out of index issue.

#11

Thank you for the comment! I’ll try to deal with that!

#12

I’m afraid I cannot fix this out-of-index-problem…
Could anyone provide me with a hint that could help me with that matter?

[ In the form there are two fields

  1. in the first field there are bus stops - first, second,…, eight.
  2. in the second field the user must enter a number (“range”). How many nearby bus stops would she or he like to see before and after the selected bus-stop. ]
    The “key”-code starts from the line 17-th.

[php]

Peatused <?php $peatused=array("esimene", "teine", "kolmas", "neljas", "viies", "kuues", "seitsmes", "kaheksas"); if (!empty ($_POST["peatus"]) && !empty($_POST["range"]) ) { $key = array_search($_POST["peatus"], $peatused); for ($i=$key-($_POST["range"]); $i<=$key+($_POST["range"]); $i++) { echo $peatused[$i]."
"; } } else { //do nothing } ?>

Vali peatus ja mitu peatust selle ümber kuvada

<?php echo " "; if(!empty($_POST['peatus'])){ echo "Vali peatus"; for( $i = 0; $i < count($peatused); $i++ ) { if($i == array_search($_POST['peatus'], $peatused)) { $selected = "selected"; }else{ $selected = ""; } echo "$peatused[$i]"; } 
        } else {
             echo "<option value=\"\" selected>Vali peatus</option>";
             for ($i = 0; $i < count($peatused); $i++)  echo "<option value=\"$peatused[$i]\">$peatused[$i]</option>";
        }
                 
    echo "</select>";

?>

		</select>
		<br/>
		<input type="number" name="range" <?php if(!empty($_POST["range"]) && is_numeric($_POST["range"])) 
	echo "value=\"".htmlspecialchars($_POST["range"])."\" "; ?> /><br/>
		<input type="submit" value="kuva"/>
	</form>
	
<?php 
if(!empty($_POST)) { // vorm esitati
	$errors=array();
	if(!empty($_POST["peatus"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatus!";
	}
	if(!empty($_POST["range"])) {
	//do sth 
	} else {
	$errors[]="Palun vali peatuste arv!";
	}		
}
	?>


<?php if (!empty($errors)): ?>
	<?php foreach($errors as $e): ?>
		<p style="color:red"> <?php echo $e; ?> </p>
	<?php endforeach?>
<?php endif;?>



</body>

[/php]

#13

Here you are getting into some possibly complicated logic.

You don’t have anything linking where the bus stops are. If they are listed in order… You could do something like,

[php]
$_POST [‘peatus’] = “teine”;
$range = 3;

foreach ( $peatused as $key => $value ) {
if ($key == array_search ( $_POST [‘peatus’], $peatused )) {
echo “Key : $key, $value
”;
// $range = $range - $key;
echo “Range : $range
”;
if ($range - $key >= 0) {
echo “Range is greater than 0
”;
while ( $range != 0 ) {
echo "{$peatused [$range]}
";
$range --;
}
} else {
echo “Range is equal or less than 0
”;
$index = 0;
while ( $range <= $key ) {
echo "{$peatused [$range]}
";
$range ++;
}
}
}[/php]

Which outputs like this:

Key : 1, teine Range : 3 Range is greater than 0 neljas kolmas teine
#14

Yes, that would be the case. Thank yo very much, astonicipher!

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