CODEWITHSUNDEEP
phphtml
Lorelo
Lorelo

Reputation: 13

Dropdown Menu Is Weird

Any PHP Experts: I'm a beginner. I have this Reference Electrode Converter:

<!DOCTYPE html>
<html>
    <head>
        <title>Referance Electrode Converter</title>
        <link rel="stylesheet" href="css/style.css">
    </head>
    <body>
        <h1>Referance Electrode Converter</h1>
        <h6>After Pressing Convert The Dropdown Goes Back to It's Defaults</h6>
        <form action="index.php" method="get">
            <input type="text" name="input" placeholder="Enter Amount"></input>
            <select name="dropdown">
                <option value="SHE" selected><sub>SHE</sub></option>
                <option value="SCE"><sub>SCE</sub></option>
                <option value="AG"><sub>Ag/AgCl</sub></option>
                <option value="MSE">MSE</option>
                <option value="CSE">CSE</option>
            </select>
            <br />
            <?php

$cc_input = $_GET['input'];
$cc_dropdown = $_GET['dropdown'];
$cc_odropdown = $_GET['odropdown'];

if(isset($_GET['sbmt']))
{
    if($cc_dropdown == 'SHE') {
        if($cc_odropdown == 'SHE') {
            $output = $cc_input * 1 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'SCE') {
            $output = $cc_input + 0.2415 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'AG') {
            $output = $cc_input + 0.222 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'MSE') {
            $output = $cc_input - 0.615 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'CSE') {
            $output = $cc_input - 0.318 . "V";
            echo "<input type='text' value='$output' disabled/>";
        }
    }
    elseif($cc_dropdown == 'SCE') {
        if($cc_odropdown == 'SHE') {
            $output = $cc_input - 0.2415 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'SCE') {
            $output = $cc_input * 1 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'AG') {
            $output = $cc_input + 0.0195 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'MSE') {
            $output = $cc_input - 0.3735 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'CSE') {
            $output = $cc_input - 0.765 . "V";
            echo "<input type='text' value='$output' disabled/>";
        }

    }
    elseif($cc_dropdown == 'AG') {
        if($cc_odropdown == 'SHE') {
            $output = $cc_input - 0.222 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'SCE') {
            $output = $cc_input - 0.0195;
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'AG') {
            $output = $cc_input * 1 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'MSE') {
            $output = $cc_input - 0.393 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'CSE') {
            $output = $cc_input - 0.096 . "V";
            echo "<input type='text' value='$output' disabled/>";
        }
    }
    elseif($cc_dropdown == 'MSE') {
        if($cc_odropdown == 'SHE') {
            $output = $cc_input + 0.615 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'SCE') {
            $output = $cc_input + 0.3735 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'AG') {
            $output = $cc_input + 0.393 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'MSE') {
            $output = $cc_input * 1 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'CSE') {
            $output = $cc_input + 0.297 . "V";
            echo "<input type='text' value='$output' disabled/>";
        }
    }
    elseif($cc_dropdown == 'CSE') {
        if($cc_odropdown == 'SHE') {
            $output = $cc_input + 0.318 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'SCE') {
            $output = $cc_input + 0.0765 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'AG') {
            $output = $cc_input + 0.096 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'MSE') {
            $output = $cc_input - 0.297 . "V";
            echo "<input type='text' value='$output' disabled/>";
        } elseif($cc_odropdown == 'CSE') {
            $output = $cc_input * 1 . "V";
            echo "<input type='text' value='$output' disabled/>";
        }
    }
}
            ?>
            <select name="odropdown">
                <option value="SHE"><sub>SHE</sub></option>
                <option value="SCE" selected><sub>SCE</sub></option>
                <option value="AG"><sub>Ag/AgCl</sub></option>
                <option value="MSE">MSE</option>
                <option value="CSE">CSE</option>
            </select>
            <br />
            <input type="submit" name="sbmt" value="Convert!"></input>
        </form>
    </body>
</html>

The weird thing is that when I click "Convert," the dropdown menus go back to whatever the HTML "selected" variable was. What can I do to fix this issue?

Thanks -Lorelo

Upvotes: 0

Views: 51

Answers (1)

Andros Rex
Andros Rex

Reputation: 372

OK, I'm not sure if this is only a problem on my server, but it threw errors when I tried to get undefined GET request variables, so I did this:

if(isset($_GET['input'])) $cc_input = $_GET['input'];
if(isset($_GET['dropdown'])) $cc_dropdown = $_GET['dropdown'];
if(isset($_GET['odropdown'])) $cc_odropdown = $_GET['odropdown'];

Anyway, in order to fix your original problem, you should check what the values of $cc_dropdown and $cc_odropdown are. Depending on that, you should decide where to echo the "selected" attribute.

UPDATE

Here's what I did:

...
    <body>
    <?php

if(isset($_GET['input'])) $cc_input = $_GET['input'];
if(isset($_GET['dropdown'])) $cc_dropdown = $_GET['dropdown'];
if(isset($_GET['odropdown'])) $cc_odropdown = $_GET['odropdown'];

    ?>
        <h1>Referance Electrode Converter</h1>
        <h6>After Pressing Convert The Dropdown Goes Back to It's Defaults</h6>
        <form action="index.php" method="get">
            <input type="text" name="input" placeholder="Enter Amount"></input>
            <select name="dropdown">
            <?php if(!isset($_GET['sbmt'])): ?>
                <option value="SHE" selected><sub>SHE</sub></option>
                <option value="SCE"><sub>SCE</sub></option>
                <option value="AG"><sub>Ag/AgCl</sub></option>
                <option value="MSE">MSE</option>
                <option value="CSE">CSE</option>
            <?php else: ?>
                <option value="SHE" <?php if($cc_dropdown=="SHE") echo "selected";  ?> ><sub>SHE</sub></option>
                <option value="SCE" <?php if($cc_dropdown=="SCE") echo "selected";  ?> ><sub>SCE</sub></option>
                <option value="AG" <?php if($cc_dropdown=="AG") echo "selected";  ?> ><sub>Ag/AgCl</sub></option>
                <option value="MSE" <?php if($cc_dropdown=="MSE") echo "selected";  ?> >MSE</option>
                <option value="CSE" <?php if($cc_dropdown=="CSE") echo "selected";  ?> >CSE</option>
            <?php endif; ?>
            </select>
            <br />
            <?php

if(isset($_GET['sbmt']))
{
        ...

UPDATE 2

I forgot to mention that you must also do this for the other dropdown list. This is only for the upper one. Don't worry, though - it's analogous.

Upvotes: 2

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