This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How to pass JavaScript variables to PHP?
how would I go about moving a javascript variable over to a php script without a form submission?
is it even possible?
ajax is an acceptable option but how
lets say I want to run thisnewoption.php in process sending it javascript variable imgfilename which contains a string
Once your php page has loaded, there's no going back. The best way to go about passing variables ( data ) back to the server is with ajax, so it might be time to brush up on ajax http://api.jquery.com/jQuery.ajax/
Update: Tell you what, here is what a really basic ajax call looks like, notice that is send data to the server here with POST:
$.ajax ( {type : 'POST' ,
url : 'email.php' ,
data : { variable: variable, anotherVariable: anotherVariable } ,
success : function ( data ) { $('#some-div').html ( data ) ; }
} ) ;
You cannot literally pass a javascipt variable as a PHP one as PHP is evaluated on server side where as javascript on client. You can use ajax call to pass it however.
Related
This question already has answers here:
What is the difference between client-side and server-side programming?
(3 answers)
How do I pass variables and data from PHP to JavaScript?
(19 answers)
Closed 7 years ago.
Hi again are there a way that i can get the variable "log" in a jquery code like the example bellow with out using alert, a field id, class and etc.
<script>
var log='1';
</script>
<?php
$run = log
?>
I want to get the data of a certain variable in a javascript and use it as a value of a variable in my php code
You can't do it that way.
Because:
javascript runs in browser.
PHP runs at server.
There are two ways one is form submission and other one is ajax. You have to send the values to the server to get it to echo.
As per your updates, i would suggest you to use ajax/form submit:
Ajax:
var log = '1';
$.ajax({
url: 'path/to/php/file.php',
type:'get',
data:{log:log},
success:function(data){
console.log(data); // logs: The posted value is 1
}
});
here in the data object log before : is the key while log after : is the var which refers to value '1'. So, in php you can do this:
<?php
if(isset($_POST['log'])){
$run = $_POST['log'];
echo 'The posted value is '.$run;
}
?>
You cannot get client side variable on server side without the use of AJAX or some sort of post back. In all calls to a server, the server side code is execute then returned to render client side in the browser. Therefor, the client side code is ALWAYS run after the server side.
You can look at using client side code to make an AJAX request to the server and return a value or post to to a page which will load and render it server side.
You are trying to echo a value here, this can be done client side but if there is complex server side logic to get the value then I would use an AJAX request to get it.
AJAX
http://www.w3schools.com/jquery/jquery_ajax_intro.asp
POST a form
http://php.net/manual/en/tutorial.forms.php
This question already has answers here:
How can I pass variables from JavaScript to PHP?
(2 answers)
Closed 9 years ago.
I want to pass a variable from a function in JavaScript to PHP that is also inside the JavaScript function.
For Example:
myfunction('qwerty');
<script>
myfunctionjs(x)
{
<?php echo $x?>
}
</script>
note: code above is just a sample
Your code sample, while it expresses what you want quite clearly, should also show how impossible it is.
PHP is a server-side language whereas javascript is a client-side language. The only way for javascript to "talk" to PHP is to submit a request to the server. You can do this either through a standard HTTP-GET request or a POST request (through a form submission, or more commonly via Ajax).
The PHP isn't inside the JavaScript function. The PHP code is executed on the server.
When the Javascript is executed, the code looks like this:
myfunction('qwerty');
<script>
myfunctionjs(x)
{
alert(x); //or whatever $x is
}
</script>
If you want to pass 'x' to a PHP script, you'll have to make an AJAX request.
You can't have javascript telling PHP to do something inline. JavaScript runs client side, while PHP runs server side.
Instead, you need to have your javascript send the data to your server, and you'll have PHP do something when receiving that second request.
If you are using jQuery, have a look at the ajax method for example on how to send data: http://api.jquery.com/jQuery.ajax/
Passing variable from javascript to php right away is not possible. You will have to use AJAX for this. You have to understand the difference between server-side scripting and client-side scripting.
https://softwareengineering.stackexchange.com/questions/171203/what-are-the-difference-between-server-side-and-client-side-programming
Read the above link and it will give you a full understanding of the process. if you have any issues let me know.
Read more
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
How to return AJAX response Text?
I'm trying to put together a JQuery timeout function for a form submit action. I have something similar in place via PHP for a page reload, and have the time of the initial page load stored in $_SESSION['pageLoad']. What I'm now trying to do is grab that value and use it in some JQuery math.
After searching around SO, I have arrived at the following:
PHP
<?php
//filename: getsession.php
session_start();
echo json_encode($_SESSION['pageLoad']);
JQuery
$("#sms-creator").submit(function() {
var session;
$.ajaxSetup({cache: false})
$.get('sms_includes/getsession.php', function(data) {
session = data;
});
//at this point I just want to see what I'm getting, hence the next 2 lines...
alert(session);
return false;
});
The path to the PHP file is relative to the form page, not the .js file.
My alert only returns 'undefined'. I'm inexperienced with Javascript and its libraries, so the fault is not apparent to me. Any help appreciated.
ajax call is done asynchronously. so when $.get is executed, request is sent to server for response, however, the javascript program will not wait for the response because it is done asynchronously. when you alert(session), variable session hasn't been set to data returned by server. Try do ajax synchronously, or put alert session in the ajax callback.
This question already has answers here:
How do I pass variables and data from PHP to JavaScript?
(19 answers)
Closed 8 years ago.
Possible Duplicate:
How to pass a variable / data from javascript to php and vice versa?
I have a file of php and javascript code. I want to set a php variable to be the result of a javascript function which takes a php variable as a parameter. For example:
$parameter = "this is a php variable";
$phpVar = echo "foo(" . parameter . ");";
I know you cannot do a "= echo", is there another way I can do this?
Thanks
You can't directly do that, since JavaScript runs on the client-side and PHP gets executed on the server-side.
You would need to execute the JavaScript first and then send the result to the server via a FORM or AJAX call.
Here's what that might look like:
PHP
$parameter = "this is a php variable";
echo "var myval = foo(" . parameter . ");";
JavaScript
var myval = foo("this is a php variable"); // generated by PHP
$.ajax({
type: 'POST',
url: 'yourphpfile.php',
data: {'variable': myval},
});
Receiving PHP (yourphpfile.php)
$myval = $_POST['variable'];
// do something
PHP code is run on the server before the response is sent; JavaScript is run after, in the browser. You can't set a PHP variable from JavaScript because there are no PHP variables in the browser, where JavaScript if running. You'll have to use an AJAX request from JavaScript to a PHP script that stores whatever information it is you want to get.
Try this:
var a = "Result: "+ <?php echo json_encode($parameter); ?>;
You have to make a GET or POST request to the script from JavaScript.
You cannot pass a js variable to php code.
PHP happens to run on the server, a thousand miles away from client, where js is run.
So, you can only call a php script, using js or regular hyperlink.
This question already has answers here:
How do I pass variables and data from PHP to JavaScript?
(19 answers)
Closed 8 years ago.
I am trying to create a site where someone can create an "item" and the database will store an id and php generates a url for that id. So next time when the person comes back with that url it will remember the person's settings (variables). Now the problem is that in my site javascript need to know these variables.
So what is the best solution for this? passing the variables in the superglobal "GET" or maybe cookies? Or is there a better way to pass these variables to javascript?
just use php to print some dynamic javascript
<script>
var myVar = "<?php echo json_encode($_COOKIE['somevalue']);?>";
</script>
There are multiple methods for providing the data to the client, such as:
Echo the variables in your javascript, var userid = <?php echo
$userid; ?>
JSON'fy your variables and supply them to your javascript via AJAX/jQuery: $.getJSON(url, function(data){ var userid = data.userid; });
I typically utilize JSON as much as possible when trying to present server-side data to the client-side, as it helps to separate the different layers.