I have a javascript variable called "list". I need to send it as a POST data to another page and open that page in a new tab (with the POST data present).
This code:
jQuery.post('datadestination.php', list);
sends the data all right, but ofcourse it opens the page in the same tab.
I saw some solutions to similar problems using invisible form and things like that, but I could not get them to work. Is there any simple solution?
If we want to force a link to a given URL to open in a new tab, we would use the following: $(document). ready(function(){ $('a[href=http://www.google.com]').click(function(){ window. open(this.
Approach: To open a new tab, we have to use _blank in the second parameter of the window. open() method. The return value of window.
You can send a form using the target="_blank" attribute.
<form action="datadestination.php" method="POST" target="_blank" id="myform">
<input type="hidden" name="list" id="list-data"/>
<input type="submit" value="Submit">
</form>
Then in JS:
jQuery('#list-data').val(list);
jQuery('#myform').submit();
This is an implementation of Sergey's solution.
<?php // this is save.php
session_start();
// DO NOT just copy from _POST to _SESSION,
// as it could allow a malicious user to override security.
// Use a disposable variable key, such as "data" here.
// So even if someone passed _POST[isAdmin]=true, all that he would do
// is populate _SESSION[data][isAuthenticated], which nobody reads,
// not the all-important _SESSION[isAuthenticated] key.
if (array_key_exists('data', $_POST)) {
$_SESSION['data'] = $_POST['data'];
$_SESSION['data.timestamp'] = time();
// Let us let the client know what happened
$msg = 'OK';
} else {
$msg = 'No data was supplied';
}
Header('Content-Type: application/json; charset=utf8');
die(json_encode(array('status' => $msg)));
?>
In the first page:
$.post('save.php', { data: list }, function(response){
if (!response.status) {
alert("Error calling save");
return;
}
if (response.status !== 'OK') {
alert(response.status);
return;
}
// We had a response and it was "OK". We're good.
window.open('datadestination.php');
});
And in datadestination.php add the fix:
if (!array_key_exists('data', $_SESSION)) {
die("Problems? Did you perchance attempt to reload the page and resubmit?");
// For if he did, then yes, $_SESSION would have been cleared.
// Same if he is operating on more than one window or browser tab.
}
// Do something to validate data. For example we can use data.timestamp
// to assure data isn't stale.
$age = time();
if (array_key_exists($ts = 'data.timestamp', $_SESSION)) {
$age -= $_SESSION[$ts];
}
if ($age > 3600) {
die("Data is more than one hour old. Did someone change server time?!?");
// I actually had ${PFY} do that to me using NTP + --hctosys, once.
// My own time zone is (most of the year) exactly one hour past GMT.
}
// This is safe (we move unsecurity-ward):
$_POST = $_SESSION['data'];
unset($_SESSION['data'], $_SESSION['data.timestamp']);
// keep things clean.
// From here on, the script behaves "as if" it got a _POST.
You can actually merge save.php
and datadestination.php
and use a "saving stub" savepost.php
that you can recycle in other pages:
<?php
session_start();
// DO NOT just copy from _POST to _SESSION,
// as it could allow a malicious user to override security.
// Use a disposable variable key, such as "data" here.
if (array_key_exists('data', $_POST)) {
// Timestamp sent by AJAX
if (array_key_exists('ts', $_POST)) {
// TODO: verify ts, but beware of time zones!
$_SESSION['data'] = $_POST['data'];
Header("Content-Type: application/json;charset=UTF-8");
die(json_encode(array('status' => 'OK')));
}
die("Error");
}
// This is safe (we move unsecurity-ward):
$_POST = $_SESSION['data'];
unset($_SESSION['data']); // keep things clean.
?>
Now your call becomes
$.post('datadestination.php', { data: list, ts: Date.now() }, function(){
window.open('datadestination.php');
});
and in your datadestination.php
(or anywhere else) you add
require 'savepost.php';
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