How to retain text box values using php?

Question

jacksantho -3 Junior Poster

12 Years Ago

Hi,
Please look at this:

<?php
 
print '
<form>
 <td><input type="text" name="txt" maxlength="7" style="text-transform:uppercase"></td>
</form>
</html>';

if(isset($_POST['submit'])
{
  $val=$_POST['txt'];
#header();
}
 ?>

my text box values gets erased after submit button. If i use header function:
error is
Warning: Cannot modify header information - headers already sent by (output started at C:\xampplite\htdocs\test.php:8) in C:\xampplite\htdocs\test.php on line 113

I want this format of my php coding. Please give me a solution to retain my text box values.

php

3 Contributors
13 Replies
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Latest Post 12 Years Ago Latest Post by jacksantho

All 13 Replies

diafol

12 Years Ago

You don't have a submit button from what I can see, so how are you submitting?
Also POST won't work as you don't stipulate a method attribute in the form tag. By default form method is GET. I don't understand the closing </html> tag. It doens't seem to make much sense to place it there. No DTD, No head, no BODY or is this script an include file?
The header() function although commented out, does not have any attributes so it won't do anything useful. The header() needs to be placed before any output (any html or echoed stuff from php).

All in all, you need to check some html and php tutorials on how to provide valid markup and create forms and how to process form data (it's also good practice to send form data to a different page via the action attribute).

sv3tli0 0 Junior Poster in Training

12 Years Ago

Your code haven't got sense.
First your check must be at start of your code so your PHP to work depnding if the event is happened or not.
Other thing is that you must add method="post" to your form.
And after ($_POST) you have missed one ).
One more thing you must make a submit button if you want to use $_POST for check

Here is corrected code sample:

<?php

    if(isset($_POST['submit']))
    {
    $val=$_POST['txt'];
    #header();
	echo $val;
    }     
    print '
    <form method="post">
    <td><input type="text" name="txt" maxlength="7" style="text-transform:uppercase"></td>
    <td><input type="submit" name="submit" maxlength="7" style="text-transform:uppercase" value="submit"></td>
    </form>
    </html>';
     
    ?>

I have added one echo of the posted text to see that its working.

Edited 12 Years Ago by sv3tli0 because: n/a

diafol

12 Years Ago

if(isset($_POST['submit']) && ($_POST['submit'])=="submit"){
   $val=trim($_POST['txt']);
}else{
   $val="";
}

that at top of file, then:

<td><input type="text" name="txt" maxlength="7" value="<?php echo $val;?>" style="text-transform:uppercase" /></td>

sv3tli0 0 Junior Poster in Training

12 Years Ago

if(isset($_POST['submit']) && ($_POST['submit'])=="submit")
    {
    $val=trim($_POST['txt']);
	print $val;
    }

just add one print and you will get your content.
If you want to store it you will need some kind of database (mysql or other) or other type for storing your data.

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jacksantho -3 Junior Poster · Answer 1 · 2011-09-01T22:25:37+00:00

My previous code is the sample code.

<?php

print '<html>

<body bgcolor=#FF8C00>
<table align=center>
<tr><th>Form</th></tr>
</table>

<table align="center" border="1">
  <tr><th>Sno</th><th>Item</th></tr>
  <form method="post" name="f1">
  <tr>
  <td>1</td>
  <td><input type="text" name="txt" maxlength="7" style="text-transform:uppercase"></td>
  </tr>

<tr>
 <td colspan="3" align="center"><input type="submit" name="submit" value="submit"></td>
 </tr>
 </form>
 </table>
 
 </body>
 </html>';
 if(isset($_POST['submit']) && ($_POST['submit'])=="submit")
{
	$val=trim($_POST['txt']);
}
?>

I am not facing the error. I need text box values to be retained. I dont know.

jacksantho -3 Junior Poster · Answer 2 · 2011-09-01T22:27:48+00:00

Hi,

I need my isset function at the bottom of the page only. Because i am displaying the result on the same page at the bottom of the form.

jacksantho -3 Junior Poster · Answer 3 · 2011-09-01T22:57:35+00:00

hi,
thanks for your coding

<td><input type="text" name="txt" maxlength="7" value="<?php echo $val;?>" style="text-transform:uppercase" /></td>

when i try your code, again the problem,

in my text box, i am getting like this <?php echo $val;?>.

I am not getting it correctly.

sv3tli0 0 Junior Poster in Training · Answer 4 · 2011-09-01T23:00:43+00:00

try

<td><input type="text" name="txt" maxlength="7" value="'.$val.'" style="text-transform:uppercase" /></td>

he hasnt notice that you use var for your html code

jacksantho -3 Junior Poster · Answer 5 · 2011-09-01T23:11:05+00:00

No, its not working.

click on submit button "textbox value gets erased". Please check my code..what i posted.

sv3tli0 0 Junior Poster in Training · Answer 6 · 2011-09-01T23:15:15+00:00

<?php
     $val="";
    if(isset($_POST['submit']) && ($_POST['submit'])=="submit")
    {
    $val=trim($_POST['txt']);
    }
    print '<html>
     
    <body bgcolor=#FF8C00>
    <table align=center>
    <tr><th>Form</th></tr>
    </table>
     
    <table align="center" border="1">
    <tr><th>Sno</th><th>Item</th></tr>
    <form method="post" name="f1">
    <tr>
    <td>1</td>
    <td><input type="text" name="txt" maxlength="7" style="text-transform:uppercase" value="'.$val.'"></td>
    </tr>
     
    <tr>
    <td colspan="3" align="center"><input type="submit" name="submit" value="submit"></td>
    </tr>
    </form>
    </table>
     
    </body>
    </html>';
    ?>

Tested..

jacksantho -3 Junior Poster · Answer 7 · 2011-09-01T23:22:53+00:00

hi..i know it will work. but my isset() function i need at the bottom of my html tag. Because i am displaying my result set at the botton of the form text box.

if i placed isset() function at the top of the page means, my result set displayed at the top of my textbox. It won't looks good for me. So i am placing isset() function at the bottom of the page. thanks

sv3tli0 0 Junior Poster in Training · Answer 8 · 2011-09-01T23:28:02+00:00

<?php
     
    print '<html>
     
    <body bgcolor=#FF8C00>
    <table align=center>
    <tr><th>Form</th></tr>
    </table>
     
    <table align="center" border="1">
    <tr><th>Sno</th><th>Item</th></tr>
    <form method="post" name="f1">
    <tr>
    <td>1</td>
    <td><input type="text" name="txt" maxlength="7" style="text-transform:uppercase" value="'.trim($_POST['txt']).'"></td>
    </tr>
     
    <tr>
    <td colspan="3" align="center"><input type="submit" name="submit" value="submit"></td>
    </tr>
    </form>
    </table>
     
    </body>
    </html>';
    if(isset($_POST['submit']) && ($_POST['submit'])=="submit")
    {
    $val=trim($_POST['txt']);
    }
    ?>

jacksantho -3 Junior Poster · Answer 9 · 2011-09-01T23:32:26+00:00

hi, thanks a lot. Its working. Thanks for your help and your helping tendency.

How to retain text box values using php?

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