Jump to content
DevFuse Forums
najaru

Dropdown in php

Recommended Posts

Hi Michael, hi all

 

I've a simple php code, for take simple data , make calcule, and print the result.

 

here my code.

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Calcolo</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" >
</head>
<body>
<?php
if (isset ($_POST['val_a']) && isset ($_POST['val_b']) && isset ($_POST['val_c']))
{
$a = (float) $_POST['val_a'];
$b = (float) $_POST['val_b'];
$c = (float) $_POST['val_c'];
$risultato = @($a * $b / $c);
if ($risultato !== FALSE)
echo "Risultato di A*B/C = " . $risultato . "<br><br>";
else
echo "Errore nel calcolo<br><br>";
}
?>
<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">
<p>
Valore A <input id="val_a" type="text" name="val_a" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_a'], ENT_QUOTES); ?>">
<br>
Valore B <input id="val_b" type="text" name="val_b" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_b'], ENT_QUOTES); ?>">
<br>
Valore C <input id="val_c" type="text" name="val_c" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_c'], ENT_QUOTES); ?>">
<br>
<input type="submit" value="Calcola">
</p>
</form>
</body>
</html>

i need to multiply the result for a SPECIFIC FACTOR, dependent by value select by user in dropdown

 

 

$risultato = @($a * $b / $c)  * FACTOR;

 

in dropdown for example:

 

RED (FACTOR=1)

GREEN (FACTOR=1,3456)

BLUE (FACTOR=3,2965)

 

then user can choice Red Blue or green in dropdown

 

does is difficult?

Share this post


Link to post
Share on other sites
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<title>Calcolo</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1" >
</head>
<body>
<?php

if (isset ($_POST['val_a']) && isset ($_POST['val_b']) && isset ($_POST['val_c']))
{
$a = (float) $_POST['val_a'];
$b = (float) $_POST['val_b'];
$c = (float) $_POST['val_c'];
$risultato = @($a * $b / $c)*$_POST['factor'];
if ($risultato !== FALSE)
echo "Risultato di A*B/C = " . $risultato . "<br><br>";
else
echo "Errore nel calcolo<br><br>";
}
?>
<form action="<?php echo $_SERVER["PHP_SELF"]; ?>" method="post">
<p>
Valore A <input id="val_a" type="text" name="val_a" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_a'], ENT_QUOTES); ?>">
<br>
Valore B <input id="val_b" type="text" name="val_b" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_b'], ENT_QUOTES); ?>">
<br>
Valore C <input id="val_c" type="text" name="val_c" size="20" maxlength="20" value="<?php echo htmlspecialchars ($_POST['val_c'], ENT_QUOTES); ?>">
<br>
Factor <select name='factor'><option value='1'>RED</option><option value='1.3456'>GREEN</option><option value='3.2965'>BLUE</option></select>
<br>
<input type="submit" value="Calcola">
</p>
</form>
</body>
</html>

Might want to clean up and test the code a bit but try this.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...