PHP: Echoing an input submitted from a form

Question

I have a form which contains one text field. Now, I'm trying to echo out the contents of that input after the form was submitted. Here's my code for the same:

<script>    
    function postResultss()
    {
        document.write("<?php echo ($_POST['tweet1']); ?>");
    }
</script>

<form method = "POST">
    <input type = "text" name = "tweet1">
    <br>
    <input type = "submit" onclick = "postResultss()" />
</form>

The above code is inside a PHP file. However, nothing gets echoed out on submitting the form. The function does get called as expected, because I have tried echoing custom messages while debugging. However, nothing gets echoed out when I try to echo the value of $_POST['tweet1'], where tweet1 is the name of the input text field whose contents I'm trying to display.

What seems to be wrong here?

Firstly, because the button is a submit button the attached javascript function postResultss() is unlikely to get called - unless it has event.preventDefault() in the js function. Secondly, the POSTed var will NOT be available to the js function at the point of clicking the button - only AFTER the form has been submitted and event then this is the wrong approach to show theposted values. — Professor Abronsius
– Professor Abronsius, Commented Aug 22, 2015 at 18:18
@RamRaider Well, when I try to echo something like echo ("felicity"); inside my JS function, the message does get displayed. Which means that the JS function is indeed being called on submitting the form. — Manas Chaturvedi
– Manas Chaturvedi, Commented Aug 22, 2015 at 18:20
OK, so the js function gets called but the POSTed variables will not be available at the time of clicking the button — Professor Abronsius
– Professor Abronsius, Commented Aug 22, 2015 at 18:23

schellingerht · Accepted Answer · 2015-08-22 18:21:44Z

2

You do a submit and onclick. That goes wrong. Further, don't do a document.write!

Do this as better alternative (no php in js):

<?php
   if ($_SERVER['REQUEST_METHOD'] == 'POST') // check if post
      echo htmlentities($_POST['tweet1']);
?>

<form method="post">
    <input type="text" name="tweet1">
    <br>
    <input type="submit" value="Tweet!">
</form>

answered Aug 22, 2015 at 18:21

schellingerht

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Comments

Professor Abronsius · Accepted Answer · 2015-08-22 18:22:18Z

1

Rather than use javascript to write the content which, in your example wouldn't work, use php to generate the response for the user to see

<form method = "POST">
    <input type = "text" name = "tweet1">
    <br>
    <input type = "submit" value='Submit' />
    <div id='msgs'>
    <?php
        if( $_SERVER['REQUEST_METHOD']=='POST' && isset( $_POST['tweet1'] ) ){
           echo $_POST['tweet1'];
        }
    ?>
    </div>
</form>

answered Aug 22, 2015 at 18:22

Professor Abronsius

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Comments

jollyjoyce1995 · Accepted Answer · 2015-08-22 18:19:21Z

0

The problem is that the javascript function is called before the form submits (so before php can print out the echo), and since the page updates the document.write is being overwritten from the new request.

Why dont you try something like this?

<form method = "POST">
    <?php echo ($_POST['tweet1']); ?>
    <input type = "text" name = "tweet1">
    <br>
    <input type = "submit"/>
</form>

or:

<script>
var text = "<?php echo ($_POST['tweet1']); ?>";
if(text != ""){
   alert(text);
}
</script>
<form method = "POST">

    <input type = "text" name = "tweet1">
    <br>
    <input type = "submit"/>
</form>

answered Aug 22, 2015 at 18:19

jollyjoyce1995

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4 Comments

jollyjoyce1995 Over a year ago

or a document write instead of the alert

Manas Chaturvedi Over a year ago

This would work, but I need to call out a function on submitting the form, so this solution may not be helpful in my case.

jollyjoyce1995 Over a year ago

wait so do you want the text to be display after or before submitting the form?

Manas Chaturvedi Over a year ago

After submitting the form. That's why I was trying to trigger the onclick event in my submit field.

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