if (isset($_POST['submit'])) not recognizing Submit button

Question

I'm trying to get the echo statement to run when the submit button is pressed. I have a name for the submit button and I'm using that in the if statement but the code does not run when I press the submit button. Thanks in advance.

<!DOCTYPE html>
<!-- Week3_Landis.php -->
<!-- Jul 3, 2018 -->
<html>
<head>
    <title>Lab3 Landis</title>
</head>
<body>
    <table border = "1">
        <form>
        <tr><td><h1>Welcome to the Diamond Maker!</h1></td></tr>
        <tr><td>Enter the size of your diamond: <input type="number" name="diamondSize"></td></tr>
        <tr><td><input type="submit" name="submit" value="Submit"></td></tr>
        </form>

        <tr><td>
        <?php
        // Row to create diamond
        if (isset($_POST['submit'])) {
            echo "stuff";
        } // End if



        ?>
        </td></tr>
    </table>
</body>
</html>

@Carcigenicate it's not necessary to use AJAX. Set the `target` of the form to the same page with a `post` method and the php code will run as intended. — Richard, Jul 03 '18 at 23:04
Your form needs an action and method. See [Your first HTML form](https://developer.mozilla.org/en-US/docs/Learn/HTML/Forms/Your_first_HTML_form) — WhereDidMyBrainGo, Jul 03 '18 at 23:04
ALL it does not need a method attribute, but the default is `method="get"` So in this case there will be no data in the `$_POST` array it will be in the `$_GET` array — RiggsFolly, Jul 03 '18 at 23:07
@smith NO, the OP could change the code to use `$_GET` _catch 22_ — RiggsFolly, Jul 03 '18 at 23:09
@smith I would call if flexible, but whatever, certainly not worth falling out over — RiggsFolly, Jul 03 '18 at 23:14

score 3 · Accepted Answer · edited Aug 01 '18 at 23:47

3

The default submit method is GET and not POST. Use <form method="post">.

edited Aug 01 '18 at 23:47

Funk Forty Niner

74,450
15
68
141

answered Jul 03 '18 at 23:03

Jay Bhatt

5,601
5
40
62

` – Funk Forty Niner Aug 01 '18 at 22:42
*"Try"* - that should be replaced with "Use". – Funk Forty Niner Aug 01 '18 at 22:44
@FunkFortyNiner Done. – Jay Bhatt Aug 01 '18 at 23:46

score 3 · Answer 2 · answered Jul 03 '18 at 23:04

You are missing one/two ideal arguments for your html form tag. Because PHP uses a server to process information, your form must go to the server and come back, thus requiring an action and a method in your starting form tag, as follows:

<form action="/YOUR_PAGE.php" method="post">

This way, when you hit submit, the form knows to send the information using the post method, and will return that same information back to the correct page.

score 1 · Answer 3 · answered Jul 03 '18 at 23:03

1

Your <form> tag does not have an action or a method. You are not POSTing anything.

<form method="POST">

answered Jul 03 '18 at 23:03

Mr Glass

1,186
1
6
14

if (isset($_POST['submit'])) not recognizing Submit button

3 Answers3