I am using the below form and I would like to prevent the whole page from refreshing after an option is selected in the Dropdown-List. Please note it seems I do not have a distinct name of the form. What is the necessary Ajax command and script to do so? I am using Jquery:
<script type ="text/javascript" src="js/jquery.1.8.3.min.js"></script>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="POST">
<div id="select">
<select name="gebiet1" onchange="this.form.submit()">
<?php
$gebietausgabe = mysqli_query($db, "SELECT DISTINCT Gebiet FROM kernfragen");
while ($row = $gebietausgabe->fetch_assoc())
{
echo '<option value="' . $row['Gebiet'] . '">' . $row['Gebiet'] . '</option>';
}
?>
</select>
</div>
</form>
First, you prevent the page from reloading by preventDefault(), then you will send a post request to the server and receive your result in the done function. If anything goes wrong, the fail function will be executed. The always function will be executed every time you send the request.
$( "form" ).on( "submit", function( event ) {
//this will prevent the page from reloading
event.preventDefault();
//send a post request to the server
//$(this).serialize() will get all the values within your form
//in this case it only gets the value of your select tag
$.post( "test.php", $( this ).serialize())
.done(function( data ) {
alert( "Data Loaded: " + data );
})
.fail(function() {
alert( "error" );
})
.always(function() {
alert( "finished" );
});
});
My first time to use Twig template with CodeIgniter. I'm used to the default form functionality of the framework, but I was asked to try to render the form using Twig. I find the template engine to be nice and confusing at the same time. So that means, my controller would be very fat with code. But the main issue here is to render the form using twig.
Below is what I used to do when I want to render a form. View: TableSample.php
<?php
echo form_open("", array("name"=>"form_reg", "method"=>"post", "id"=>"form_reg"));
echo form_input("type"=>"text", "name"=>"fname", "value"=>set_value("fname"));
echo form_input("type"=>"text", "name"=>"lname", "value"=>set_value("lname"));
echo form_input("type"=>"text", "name"=>"emailaddress", "value"=>set_value("emailaddress"));
echo form_input("type"=>"submit", "name"=>"submit", "value"=>"Submit");
echo form_close();
?>
Controller: register.php
public function register (){
$this->load->view("TableSample");
if($this->input->post("submit")) {
/** retrieve input details, pass them as array to model, then redirect if registration is successful**/
}
}
But since I have to use Twig, things have been a little bit different.
public function register () {
$detail["form_open"] = form_open("", array("name"=>"form_reg", "method"=>"post", "id"=>"form_reg"));
$detail["form_input_name"] = form_input("type"=>"text", "name"=>"fname");
$detail["form_input_lname"] = form_input("type"=>"text", "name"=>"lname");
$detail["form_input_eadd"] = form_input("type"=>"text", "name"=>"email");
$detail["form_input_submit"] = form_input("type"=>"submit", "name"=>"submit", "value"=>"Submit");
$detail["form_close"] = form_close();
//codes for saving here
//call twig view
$this->twig->display("tableSample.html.twig", $detail);
}
tableSample.html.twig would be like this:
<html>
<head></head>
<body>
{{ form_open }} //will display form as a **String** and not THE **HTML** like this:
<form method="post" name="form_reg" id="form_reg"></form>
{{ form_close }}
</body>
</html>
I know I'm missing something, please point me to the right way of rendering this. Thank You!
ok, I think I got it. raw made it possible. Twig Raw Filter
I have a simple form that submits text to my SQL table. The problem is that after the user submits the text, they can refresh the page and the data gets submitted again without filling the form again. I could redirect the user to another page after the text is submitted, but I want users to stay on the same page.
I remember reading something about giving each user a unique session id and comparing it with another value which solved the problem I am having but I forgot where it is.
I would also like to point out that you can use a javascript approach, window.history.replaceState to prevent a resubmit on refresh and back button.
<script>
if ( window.history.replaceState ) {
window.history.replaceState( null, null, window.location.href );
}
</script>
Proof of concept here: https://dtbaker.net/files/prevent-post-resubmit.php (Link no longer works)
I would still recommend a Post/Redirect/Get approach, but this is a novel JS solution.
Use the Post/Redirect/Get pattern. http://en.wikipedia.org/wiki/Post/Redirect/Get
With my website, I will store a message in a cookie or session, redirect after the post, read the cookie/session, and then clear the value of that session or cookie variable.
You can prevent form resubmission via a session variable.
First you have to set rand() in a textbox and $_SESSION['rand'] on the form page:
<form action="" method="post">
<?php
$rand=rand();
$_SESSION['rand']=$rand;
?>
<input type="hidden" value="<?php echo $rand; ?>" name="randcheck" />
Your Form's Other Field
<input type="submit" name="submitbtn" value="submit" />
</form>
After that check $_SESSION['rand'] with textbox $_POST['randcheck'] value
like this:
if(isset($_POST['submitbtn']) && $_POST['randcheck']==$_SESSION['rand'])
{
// Your code here
}
Make sure you start the session on every file you are using it with session_start()
I use this javascript line to block the pop up asking for form resubmission on refresh once the form is submitted.
if ( window.history.replaceState ) {
window.history.replaceState( null, null, window.location.href );
}
Just place this line at the footer of your file and see the magic
When the form is processed, you redirect to another page:
... process complete....
header('Location: thankyou.php');
you can also redirect to the same page.
if you are doing something like comments and you want the user to stay on the same page, you can use Ajax to handle the form submission
You should really use a Post Redirect Get pattern for handling this but if you've somehow ended up in a position where PRG isn't viable (e.g. the form itself is in an include, preventing redirects) you can hash some of the request parameters to make a string based on the content and then check that you haven't sent it already.
//create digest of the form submission:
$messageIdent = md5($_POST['name'] . $_POST['email'] . $_POST['phone'] . $_POST['comment']);
//and check it against the stored value:
$sessionMessageIdent = isset($_SESSION['messageIdent'])?$_SESSION['messageIdent']:'';
if($messageIdent!=$sessionMessageIdent){//if its different:
//save the session var:
$_SESSION['messageIdent'] = $messageIdent;
//and...
do_your_thang();
} else {
//you've sent this already!
}
I found next workaround. You may escape the redirection after processing POST request by manipulating history object.
So you have the HTML form:
<form method=POST action='/process.php'>
<input type=submit value=OK>
</form>
When you process this form on your server you instead of redirecting user to /the/result/page by setting up the Location header like this:
$cat process.php
<?php
process POST data here
...
header('Location: /the/result/page');
exit();
?>
After processing POSTed data you render small <script> and the result /the/result/page
<?php
process POST data here
render the <script> // see below
render `/the/result/page` // OK
?>
The <script> you should render:
<script>
window.onload = function() {
history.replaceState("", "", "/the/result/page");
}
</script>
The result is:
as you can see the form data is POSTed to process.php script.
This script process POSTed data and rendering /the/result/page at once with:
no redirection
no rePOST data when you refresh page (F5)
no rePOST when you navigate to previous/next page through the browser history
UPD
As another solution I ask feature request the Mozilla FireFox team to allow users to setup NextPage header which will work like Location header and make post/redirect/get pattern obsolete.
In short. When server process form POST data successfully it:
Setup NextPage header instead of Location
Render the result of processing POST form data as it would render for GET request in post/redirect/get pattern
The browser in turn when see the NextPage header:
Adjust window.location with NextPage value
When user refresh the page the browser will negotiate GET request to NextPage instead of rePOST form data
I think this would be excelent if implemented, would not? =)
Use header and redirect the page.
header("Location:your_page.php"); You can redirect to same page or different page.
Unset $_POST after inserting it to Database.
unset($_POST);
A pretty surefire way is to implement a unique ID into the post and cache it in the
<input type='hidden' name='post_id' value='".createPassword(64)."'>
Then in your code do this:
if( ($_SESSION['post_id'] != $_POST['post_id']) )
{
$_SESSION['post_id'] = $_POST['post_id'];
//do post stuff
} else {
//normal display
}
function createPassword($length)
{
$chars = "abcdefghijkmnopqrstuvwxyz023456789";
srand((double)microtime()*1000000);
$i = 0;
$pass = '' ;
while ($i <= ($length - 1)) {
$num = rand() % 33;
$tmp = substr($chars, $num, 1);
$pass = $pass . $tmp;
$i++;
}
return $pass;
}
A refined version of Moob's post. Create a hash of the POST, save it as a session cookie, and compare hashes every session.
// Optionally Disable browser caching on "Back"
header( 'Cache-Control: no-store, no-cache, must-revalidate' );
header( 'Expires: Sun, 1 Jan 2000 12:00:00 GMT' );
header( 'Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT' );
$post_hash = md5( json_encode( $_POST ) );
if( session_start() )
{
$post_resubmitted = isset( $_SESSION[ 'post_hash' ] ) && $_SESSION[ 'post_hash' ] == $post_hash;
$_SESSION[ 'post_hash' ] = $post_hash;
session_write_close();
}
else
{
$post_resubmitted = false;
}
if ( $post_resubmitted ) {
// POST was resubmitted
}
else
{
// POST was submitted normally
}
Basically, you need to redirect out of that page but it still can make a problem while your internet slow (Redirect header from serverside)
Example of basic scenario :
Click on submit button twice
Way to solve
Client side
Disable submit button once client click on it
If you using Jquery : Jquery.one
PRG Pattern
Server side
Using differentiate based hashing timestamp / timestamp when request was sent.
Userequest tokens. When the main loads up assign a temporary request tocken which if repeated is ignored.
How to prevent php form resubmission without redirect. If you are using $_SESSION (after session_start) and a $_POST form, you can do something like this:
if ( !empty($_SESSION['act']) && !empty($_POST['act']) && $_POST['act'] == $_SESSION['act'] ) {
// do your stuff, save data into database, etc
}
In your html form put this:
<input type="hidden" id="act" name="act" value="<?php echo ( empty($_POST['act']) || $_POST['act']==2 )? 1 : 2; ?>">
<?php
if ( $_POST['act'] == $_SESSION['act'] ){
if ( empty( $_SESSION['act'] ) || $_SESSION['act'] == 2 ){
$_SESSION['act'] = 1;
} else {
$_SESSION['act'] = 2;
}
}
?>
So, every time when the form is submitted, a new act is generated, stored in session and compared with the post act.
Ps: if you are using an Get form, you can easily change all POST with GET and it works too.
The $_POST['submit'] variable would not exist on initial loading of page, and curl can be run only if below condition is true.
if($_POST['submit'] == "submit"){
// This is where you run the Curl code and display the output
$curl = curl_init();
//clear $post variables after posting
$_POST = array();
}
After inserting it to database, call unset() method to clear the data.
unset($_POST);
To prevent refresh data insertion, do a page redirection to same page or different page after record insert.
header('Location:'.$_SERVER['PHP_SELF']);
Using the Post/Redirect/Get pattern from Keverw answer is a good idea. However, you are not able to stay on your page (and I think this was what you were asking for?) In addition, it may sometimes fail:
If a web user refreshes before the initial submission has completed
because of server lag, resulting in a duplicate HTTP POST request in
certain user agents.
Another option would be to store in a session if text should be written to your SQL database like this:
if($_SERVER['REQUEST_METHOD'] != 'POST')
{
$_SESSION['writeSQL'] = true;
}
else
{
if(isset($_SESSION['writeSQL']) && $_SESSION['writeSQL'])
{
$_SESSION['writeSQL'] = false;
/* save $_POST values into SQL */
}
}
As others have said, it is not possible to out of using post/redirect/get. But at the same time it is quite easy to do what you want to do server side.
In your POST page you simply validate the user input but do not act on it, instead you copy it into a SESSION array. You then redirect back to the main submission page again. Your main submission page starts by checking to see if the SESSION array that you are using exists, and if so copy it into a local array and unset it. From there you can act on it.
This way you only do all your main work once, achieving what you want to do.
I searched for solution to prevent resubmission in a huge project afterwards.
The code highly works with $_GET and $_POST and I can't change the form elements behaviour without the risk of unforeseen bugs.
So, here is my code:
<!-- language: lang-php -->
<?php
// Very top of your code:
// Start session:
session_start();
// If Post Form Data send and no File Upload
if ( empty( $_FILES ) && ! empty( $_POST ) ) {
// Store Post Form Data in Session Variable
$_SESSION["POST"] = $_POST;
// Reload Page if there were no outputs
if ( ! headers_sent() ) {
// Build URL to reload with GET Parameters
// Change https to http if your site has no ssl
$location = "https://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
// Reload Page
header( "location: " . $location, true, 303 );
// Stop any further progress
die();
}
}
// Rebuilt POST Form Data from Session Variable
if ( isset( $_SESSION["POST"] ) ) {
$_POST = $_SESSION["POST"];
// Tell PHP that POST is sent
$_SERVER['REQUEST_METHOD'] = 'POST';
}
// Your code:
?><html>
<head>
<title>GET/POST Resubmit</title>
</head>
<body>
<h1>Forms:</h1>
<h2>GET Form:</h2>
<form action="index.php" method="get">
<input type="text" id="text_get" value="test text get" name="text_get"/>
<input type="submit" value="submit">
</form>
<h2>POST Form:</h2>
<form action="index.php" method="post">
<input type="text" id="text_post" value="test text post" name="text_post"/>
<input type="submit" value="submit">
</form>
<h2>POST Form with GET action:</h2>
<form action="index.php?text_get2=getwithpost" method="post">
<input type="text" id="text_post2" value="test text get post" name="text_post2"/>
<input type="submit" value="submit">
</form>
<h2>File Upload Form:</h2>
<form action="index.php" method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file">
<input type="submit" value="submit">
</form>
<h1>Results:</h1>
<h2>GET Form Result:</h2>
<p>text_get: <?php echo $_GET["text_get"]; ?></p>
<h2>POST Form Result:</h2>
<p>text_post: <?php echo $_POST["text_post"]; ?></p>
<h2>POST Form with GET Result:</h2>
<p>text_get2: <?php echo $_GET["text_get2"]; ?></p>
<p>text_post2: <?php echo $_POST["text_post2"]; ?></p>
<h2>File Upload:</h2>
<p>file:
<pre><?php if ( ! empty( $_FILES ) ) {
echo print_r( $_FILES, true );
} ?></pre>
</p>
<p></p>
</body>
</html><?php
// Very Bottom of your code:
// Kill Post Form Data Session Variable, so User can reload the Page without sending post data twice
unset( $_SESSION["POST"] );
It only works to avoid the resubmit of $_POST, not $_GET. But this is the behaviour I need.
The resubmit issue doesn't work with file uploads!
What Works For Me is :
if ( !refreshed()) {
//Your Submit Here
if (isset( $_GET['refresh'])) {
setcookie("refresh",$_GET['refresh'], time() + (86400 * 5), "/");
}
}
}
function refreshed()
{
if (isset($_GET['refresh'])) {
$token = $_GET['refresh'];
if (isset($_COOKIE['refresh'])) {
if ($_COOKIE['refresh'] != $token) {
return false;
} else {
return true;
}
} else {
return false;
}
} else {
return false;
}
}
function createToken($length) {
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$charactersLength = strlen($characters);
$randomString = '';
for ($i = 0; $i < $length; $i++) {
$randomString .= $characters[rand(0, $charactersLength - 1)];
}
return $randomString;
}
?>
And in your Form
<form action="?refresh=<?php echo createToken(3)?>">
</form>
This form.php sample shows how to use PRG correct (when form is valid or not).
It redirects to the same page, only when form is valid and action was performed.
Redirection protects form from being resubmitted on page refresh.
It uses session to not loose success messages you want to show when form is valid.
There are two buttons for testing: "Valid submit", "Invalid submit". Try both and refresh page after that.
<?php
session_start();
function doSelfRedirect()
{
header('Location:'.$_SERVER['PHP_SELF']);
exit;
}
function setFlashMessage($msg)
{
$_SESSION['message'] = $msg;
}
function getFlashMessage()
{
if (!empty($_SESSION['message'])) {
$msg = $_SESSION['message'];
unset($_SESSION['message']);
} else {
$msg = null;
}
return $msg;
}
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
// Validation primitive example.
if (empty($_POST['valid'])) {
$formIsValid = false;
setFlashMessage('Invalid form submit');
} else {
$formIsValid = true;
}
if ($formIsValid) {
// Perform any actions here.
// ...
// Cool!
setFlashMessage('Form is valid. Action performed.');
// Prevent form resubmission.
doSelfRedirect();
}
}
?>
<h1>Hello form</h1>
<?php if ($msg = getFlashMessage()): ?>
<div><?= $msg ?></div>
<?php endif; ?>
<form method="post">
<input type="text" name="foo" value="bar"><br><br>
<button type="submit" name="invalid" value="0">Invalid submit</button>
<button type="submit" name="valid" value="1">Valid submit</button>
</form>
if (($_SERVER['REQUEST_METHOD'] == 'POST') and (isset($_SESSION['uniq']))){
if($everything_fine){
unset($_SESSION['uniq']);
}
}
else{
$_SESSION['uniq'] = uniqid();
}
$everything_fine is the boolean result of form-validation. If the form is not validating then it shall be usually displayed again with a hint what to correct, so that the user can send it again. Therefore the $_SESSION['uniq'] is created again too if a corrected form is desired
Why not just use the $_POST['submit'] variable as a logical statement in order to save whatever is in the form. You can always redirect to the same page (In case they refresh, and when they hit go back in the browser, the submit post variable wouldn't be set anymore. Just make sure your submit button has a name and id of submit.
I'm setting up a FORM and need to test it without processing the php... how do I make the submit bottom take me to the next padro
<form action="test.html" method="POST" id="acct_access">
...
</form>
In case you want to make some client-side validation (hope I get the question correctly) you need the onsubmit event of the form to be extended:
HTML
<form action="test.html" method="POST" id="acct_access" onsubmit="validateForm();">
...
</form>
JavaScript:
function validateForm () {
//do your validation here
//you need to return 'true' if everything is valid
//or 'false' if something went wrong - this will not make the POST call
return true;
}
You need to change your action to point to the new file.
<form action="access.html" method="POST" id="acct_access">
...
</form>
Optionally, in the php file, write some short bypass code that will send the user on to the follow-up page.
<?php
header( 'Location: access.html' ) ;
?>
Let's say that I have a file (file1.php) with a simple form with the action attribute:
echo'
<form action="foo.php" method="post">
Name: <input type="text" name="username" /><br />
Email: <input type="text" name="email" /><br />
<input type="submit" name="submit" value="Submit me!" />
</form>';
$another_var = $user_id+5;
Let's say the foo.php looks something like this:
$sql ... SELECT user_id, username... WHERE username = $_POST['username']; //or so
echo 'We got the user ID. it is in a variable!';
$user_id = $row['user_id'];
As you see, I need the variable $user_id made in foo.php actually to be used in the main file file1.php.
Is there any way to do this? I though that return $user_id would work but I was wrong :-/
Some notes to have into account:
in file1.php there are two forms: one to upload a file (example above) and another to save all the data into a database (that's the reason I need the variable name).
the example is just that, an example. I'm not really adding 5 to the variable requested, but I don't want to copy and paste 100 lines of code to overwhelm everybody.
the variable is also refreshed with javascript, So I see it there but I don't really know how to assign a javascript variable to a php variable (if possible).
THANKS!!!
Here's how I would do it.
The html:
<form id="form1" action="foo.php" method="post">
<!-- form elements -->
</form>
<form id="form2" action="bar.php" method = "post">
<input type="hidden" name="filename" value="" />
<!-- other form elements -->
</form>
The javascript
$('#form1').submit(function(){
var formdata = ''; //add the form data here
$.ajax({
url: "foo.php",
type: "POST",
data: formdata,
success : function(filename){
//php script returns filename
//we apply this filename as the value for the hidden field in form2
$('#form2 #filename').val(filename);
}
});
});
$('#form2').submit(function(){
//another ajax request to submit the second form
//when you are preparing the data, make sure you include the value of the field 'filename' as well
//the field 'filename' will have the actual filename returned by foo.php by this point
});
The PHP
foo.php
//receive file in foo.php
$filename = uniqid(); //i generally use uniqid() to generate unique filenames
//do whatever with you file
//move it to a directory, store file info in a DB etc.
//return the filename to the AJAX request
echo $filename;
bar.php
//this script is called when the second form is submitted.
//here you can access the filename generated by the first form
$filename = $_POST['filename'];
//do your stuff here
use the Jquery Form plugin to upload the file via Ajax
$(document).ready(function(){
$('yourform').submit(function(){ //the user has clicked on submit
//do your error checking and form validation here
if (!errors)
{
$('yourform').ajaxSubmit(function(data){ //submit the form using the form plugin
alert(data); //here data will be the filename returned by the first PHP script
});
}
});
});
As you'll notice, you haven't specified either the POST data or the URL of the PHP script. ajaxSubmit picks up the POST data from the form automatically and submits it to the URL specified in the action of the form
I can think of two ways off the top of my head.
1.
session_start();
$_SESSION['user'] = $row['user_id']
Then, you can refer to $_SESSION['user'] whenever until the session is destroyed.
Another way would be to include the file that defines $user_id (foo.php) into file1.php with:
include("file1.php");
It is probably easier to achieve this with sessions.
Actually, ONE MORE THING you could use is to pass the variable value through the URL if it isn't something that needs to be kept private.
echo "<a href='file1.php?userid=" .$userid. "' > LINK </a>";
or
<?php
echo "
<html>
<head>
<meta HTTP-EQUIV='REFRESH' content='0; url=file1.php?userid=" .$userid. "'>
</head>
</html>";
Then, on file1.php you would access that variable like this.
$userid = $_GET['userid'];
and you can use $userid as you please.