got a small problem, this code
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
<?php
...
echo '<input name="textfield" type="text" id="textfield" value="Roger" />';
echo 'Hello, '.$_POST['textfield'].'<br>';
...
?></p>
</form>
should echo out "Hello, Roger", as roger is the default value, yet it gives out only "Hello, " and nothing else. Any suggestions?
edit: yes, there's a form.
Thanks!
You are echoing the text box and at the same time hoping to gets its value, which is not possible.
echo '<input name="textfield" type="text" id="textfield" value="Roger" />';
echo 'Hello, '.$_POST['textfield'].'<br>';
You need to first submit the form with method set to post and only then you can get its value.
Example:
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post">
...
<input name="textfield" type="text" id="textfield" value="Roger" />
...
<input name="submit" type="submit" id="submit" value="submit" />
</form>
PHP
if (isset($_POST['submit']))
{
echo 'Hello, '.$_POST['textfield'].'<br>';
}
Try print_r($_POST) or var_dump($_POST) to see if any POST data gets submitted.
Edit: Did you specify POST as the submit method in your form tag? Do you submit the form? Please show the entire <form>-Tag.
If this is, exactly, your code then the problem is that the $_POST is not set yet since no form is submitted.
check the css (is it hidden..?=
check the source for the page (does the input field appear?)
don't forget to wrap the input in a form if you want to submit it back to the same page.
My guess it, that the server doesn't allocate $_GET and/or $_POST. You could check that in the php configuration.
Have a look if you can access the data via $_REQUEST, which should unify get and post data.
Related
I have a problem of getting the value of an input element. Thanks in advance for help! This is the sample code:
<form action="#" method="POST">
<input name="X" value="3" />
<?php
//question: how can I put the value of input in a variable
//$_POST['X']; isn't applicable since I am in the same form.
?>
</form>
<form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>" method="POST">
<input name="X" value="3" />
<input type="submit" value="Submit">
</form>
<?php
if(isset($_POST['X']) == true){
echo $_POST['X'];
}
?>
First of all submitting a form on its own page is a bad practice because whenever you reload the page the form will submit everytime.
Best approach is that you set the action attribute of form to another file or link.
fileOne.php (where your form is located):
<form action="anotherfile.php" method="POST">
<input name="X" value="3" />
<button type="submit" name="submitForm">Submit</button>
</form>
Then in anotherfile.php you will do this:
$check = $_POST["submitForm"];
If(isset($check))
{
$myInputValue = $_POST["X"];
header("Location: fileOne.php/?val".$myInputValue);
}
Then in fileOne.php you can get the variable and its value which is sent via link in the browser like this:
$getInputValue = $_GET["val"];
Now you can echo out the $getInputValue variable wherever you want.
If the the information is not sensitive this is the best approach you got. But if it is, try saving that value in the session and retrieving in the file where you want. I hope it helps. Typed code via app so it might throw an error. But i think this code will work fine. Good luck!
I have a form on an HTML/PHP page.
I have the same exact code on other pages on the site, and it works fine. I cannot figure it out.
Form:
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input name="prize_id" type="hidden" value="<?php echo $prize_id; ?>" />
<input name="ContestEntry" type="submit" class="submit" value="Enter me in the Raffle!" />
</form>
I looked at the HTML source code, and the action populates the correct page, and $prize_id populates the correct info in the value.
PHP:
if(isset($_POST['ContestEntry'])){
//...code to enter data into form, irrelevent since it won't post anything anyway.
}
else {
echo 'Nothing posted from form';
}
"Nothing posted from form" always shows, and no data is being entered into the database. I've tried changing the form name to 5 different things, thinking maybe there was a conflicting name somewhere, but nothing works.
Any ideas?
If all you need to achieve is check whether the form is submitted or not, it's better to check that the request type is a POST:
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// Process form
} else {
// Nothing posted!
}
Also change your submit button to:
<button type="submit">Submit</button>
and see what happens
The code you posted actually works for me.
But, if you still can't get it working, I would try checking to see if prize_id is set rather than the button. The PHP script is executed when the form is submitted.
Also, I would recommend that you don't use $_SERVER['PHP_SELF'] as the form action. According to https://stackoverflow.com/a/14093363/3593228, that can make it easy for attackers to insert malicious data. Instead, leave the action empty.
The if Condition is not working because you put it on Button, instead of this just make an hidden field in the form to check form is submit or not like as you already have one. Or make new for this form.
<input name="prize_id" type="hidden" value="<?php echo $prize_id; ?>" />
Consider adding what you're looking for as another hidden field:
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<input name="prize_id" type="hidden" value="<?php echo $prize_id; ?>" />
<input name="ContestEntry" type="hidden" value="Enter me in the Raffle!" />
<input type="submit" class="submit" />
</form>
I have a script that users can submit certain data, and after a submit they can "review" the output and go back to previous page or submit to it again and there is my proble, the submitted page: How can I submit it again to write it to a file?
form.html
<form method="post" action="vaihe2.php">
<input name="laskuttaja" type="text" value="Nimi" size="25">
<input name="submit" type="submit" value="Lähetä" />
</form>
vaihe2.php
<?
$laskuttaja = $_POST['laskuttaja'];
$data = '<B>'.$laskuttaja.'</b>';
echo $data;
?>
So how can I post that $data to next page(vaihe3.php) with submit and let the script write it to a file. I know how php write file works but the post to third page is not working.
If you wat to go back, the secret is in the value of the input.
<input name="laskuttaja" type="text" value="<?php echo(isset($_POST['laskuttaja'])?$_POST['laskuttaja']:"Nimi";?>" size="25"/>
To 'save' data to the next page use $_SESSIONs. They're simple to use. Just remember everywhere you use them, you must have session_start(); on LINE 1! Can't stress that enough!
$_SESSION['data']=$data;
on your third page:
echo$_SESSION['data'];
More on sessions here.
In vaihe2.php
<form method="post" action="vaihe3.php">
<?
$laskuttaja = $_POST['laskuttaja'];
$data = '<B>'.$laskuttaja.'</b>';
echo $data;
echo "<input name=\"laskuttaja\" type=\"hidden\" value=\"".$laskuttaja."\" size=\"25\">";
?>
<input name="submit" type="submit" value="anything" />
</form>
Here you are passing laskuttaja as hidden field and on post will be available to you in third page.
Now data flow as per your requirement. User fills data in form.html -> reviews on vaihe2 and confirms -> gets written in vaihe3.
Could you post the form conditionally back to itself until validated by checkbox? the action would change to "vaihe3.php" ?
<form method="post" action="<?php if ($_POST["valid"]==1) {echo 'vaihe3.php';} ?>">
<input name="laskuttaja" type="text" value="<?php if ($_POST['laskuttaja']!=='') {echo '$_POST[laskuttaja]'} else {echo 'Nimi';} ?>" size="25">
<?php if (isset ($_POST['laskuttaja') && $_POST['laskuttaja']!=="") {
echo 'Please Confirm your answers: <input name="valid" type="checkbox" value="1" />'; } ?>
<input name="submit" type="submit" value="Lähetä" />
</form>
Otherwise, the mention above about CURL would be another option. Or - since your using PHP anyways, you could write the values of form submission to a session array and make them available to all pages until you empty the array.
I have one page with a simple post form
<form name="click" action="UserOrders.php" method="post">
<input type="hidden" name="amount" value="<?php echo $total ?>">
<input type="image" src="/Templates/images/UpdateButton.png" name="submit">
</form>
and the only thing I want to check is if it submits.. In the other page "UserOrders.php" I just wrote
<?php
if ($_POST['submit']){
echo $_SESSION['ID'];
}
It seems to me irregular that it doesn't work and I would like another set of eyes to check it out.
(if i put the echo $_SESSION['ID'] outside the brackets, it works.)
An input type="image" only defines that image as the submit button and not as an input that can carry over a value to the server. source
An alternative way to see if the form was submitted is to check $_SERVER['REQUEST_METHOD']
if ('POST' === $_SERVER['REQUEST_METHOD']) {
// submitted
}
I agree with the previous answer. You are not actually putting any information to the form and therefore there is nothing for the new form to react to. $_POST['submit"] is looking for data that was sent and not for the method of sending.
There's no actual submit button. You need a
<form action="UsersOrders.php" method="POST">
<input type="whatever you want" name="input">
<input type="submit" name="submit">
</form>
Now if you go into UsersOrders.php and do what you did before:
if($_POST['submit']) {
echo $_POST['input'];
}
You will actually get some input.
I am trying to run a function from a PHP script in the form action.
My code:
<?php
require_once ( 'username.php' );
echo '
<form name="form1" method="post" action="username()">
<p>
<label>
<input type="text" name="textfield" id="textfield">
</label>
</p>
<p>
<label>
<input type="submit" name="button" id="button" value="Submit">
</label>
</p>
</form>';
?>
I echo the form but I want the function "username" which is called from username.php to be executed. how can I do this in a simliar way to the above?
<?php
require_once ( 'username.php' );
if (isset($_POST['textfield'])) {
echo username();
return;
}
echo '
<form name="form1" method="post" action="">
<p>
<label>
<input type="text" name="textfield" id="textfield">
</label>
</p>
<p>
<label>
<input type="submit" name="button" id="button" value="Submit">
</label>
</p>
</form>';
?>
You need to run the function in the page the form is sent to.
In PHP functions will not be evaluated inside strings, because there are different rules for variables.
<?php
function name() {
return 'Mark';
}
echo 'My name is: name()'; // Output: My name is name()
echo 'My name is: '. name(); // Output: My name is Mark
The action parameter to the tag in HTML should not reference the PHP function you want to run. Action should refer to a page on the web server that will process the form input and return new HTML to the user. This can be the same location as the PHP script that outputs the form, or some people prefer to make a separate PHP file to handle actions.
The basic process is the same either way:
Generate HTML form to the user.
User fills in the form, clicks submit.
The form data is sent to the locations defined by action on the server.
The script validates the data and does something with it.
Usually a new HTML page is returned.
A simple example would be:
<?php
// $_POST is a magic PHP variable that will always contain
// any form data that was posted to this page.
// We check here to see if the textfield called 'name' had
// some data entered into it, if so we process it, if not we
// output the form.
if (isset($_POST['name'])) {
print_name($_POST['name']);
}
else {
print_form();
}
// In this function we print the name the user provided.
function print_name($name) {
// $name should be validated and checked here depending on use.
// In this case we just HTML escape it so nothing nasty should
// be able to get through:
echo 'Your name is: '. htmlentities($name);
}
// This function is called when no name was sent to us over HTTP.
function print_form() {
echo '
<form name="form1" method="post" action="">
<p><label><input type="text" name="name" id="textfield"></label></p>
<p><label><input type="submit" name="button" id="button" value="Submit"></label></p>
</form>
';
}
?>
For future information I recommend reading the PHP tutorials: http://php.net/tut.php
There is even a section about Dealing with forms.
I'm not sure I understand what you are trying to achieve as we don't have what username() is supposed to return but you might want to try something like that. I would also recommend you don't echo whole page and rather use something like that, it's much easier to read and maintain:
<?php
require_once ( 'username.php' );
if (isset($_POST)) {
$textfield = $_POST['textfield']; // this will get you what was in the
// textfield if the form was submitted
}
?>
<form name="form1" method="post" action="<?php echo($_SERVER['PHP_SELF']) ?">
<p>Your username is: <?php echo(username()) ?></p>
<p>
<label>
<input type="text" name="textfield" id="textfield">
</label>
</p>
<p>
<label>
<input type="submit" name="button" id="button" value="Submit">
</label>
</p>
</form>
This will post the results in the same page. So first time you display the page, only the empty form is shown, if you press on submit, the textfield field will be in the $textfield variable and you can display it again as you want.
I don't know if the username() function was supposed to return you the URL of where you should send the results but that's what you'd want in the action attribute of your form. I've put the result down in a sample paragraph so you see how you can display the result. See the "Your username is..." part.
// Edit:
If you want to send the value without leaving the page, you want to use AJAX. Do a search on jQuery on StackOverflow or on Google.
You would probably want to have your function return the username instead of echo it though. But if you absolutely want to echo it from the function, just call it like that <?php username() ?> in your HTML form.
I think you will need to understand the flow of the client-server process of your pages before going further. Let's say that the sample code above is called form.php.
Your form.php is called.
The form.php generates the HTML and is sent to the client's browser.
The client only sees the resulting HTML form.
When the user presses the button, you have two choices: a) let the browser do its usual thing so send the values in the form fields to the page specified in action (in this case, the URL is defined by PHP_SELF which is the current page.php). Or b) use javascript to push this data to a page without refreshing the page, this is commonly called AJAX.
A page, in your case, it could be changed to username.php, will then verify against the database if the username exists and then you want to regenerate HTML that contains the values you need, back to step 1.
I think it should be like this..
<?php
require_once ( 'username.php' );
echo '
<form name="form1" method="post" action="<?php username() ?>">
<p>
<label>
<input type="text" name="textfield" id="textfield">
</label>
</p>
<p>
<label>
<input type="submit" name="button" id="button" value="Submit">
</label>
</p>
</form>';
?>
It's better something like this...post the data to the self page and maybe do a check on user input.
<?php
require_once ( 'username.php' );
if(isset($_POST)) {
echo "form post"; // ex $_POST['textfield']
}
echo '
<form name="form1" method="post" action="' . $_SERVER['PHP_SELF'] . '">
<p>
<label>
<input type="text" name="textfield" id="textfield">
</label>
</p>
<p>
<label>
<input type="submit" name="button" id="button" value="Submit">
</label>
</p>
</form>';
?>
Is it really a function call on the action attribute? or it should be on the onSUbmit attribute, because by convention action attribute needs a page/URL.
I think you should use AJAX with that,
There are plenty PHP AJAX Frameworks to choose from
http://www.phplivex.com/example/submitting-html-forms-with-ajax
http://www.xajax-project.org/en/docs-tutorials/learn-xajax-in-10-minutes/
ETC.
Or the classic way
http://www.w3schools.com/php/php_ajax_php.asp
I hope these links help
You can put the username() function in another page, and send the form to that page...