im stucked with following issue. I have an javascript (jquery) function where i need to pass a variable to php ON .success method. See below Please:
http://paste.org/55404
Any idea how to achieve this? Or is it even possible?
Thanks in advance.
jQuery runs in the browser. PHP runs on the server. So you can not mix and match them like that.
Instead, you will have to use AJAX or another mechanism to contact the server and get the information you need.
Depending on your use case, there may be other solutions, such as inserting the values into the page when the server generates it, or putting the values in a cookie.
Referring to your code, The .success method is called, when your ajax request to "index.php" returns a successful response.
Since you need to get the PHP variable in this function, you can attach the value of "genNavSide()" to the response as a parameter. It is the same way you assigned pageName value, and content value to the response data.
For example, instead of :
<?php echo pagesSideBar('data.pageName') ?>
call the function from your index.php, during the ajax call.
$sidebar = pagesSideBar($PageName);
$response->sidebar = $sidebar; // I just mentioned object, you can assign whatever way you are following to create the response
In the .success method :
jQuery('#links').html(data.sidebar);
Related
I am working on a project where I used ajax for asynchronous DB access.
I store the value in JavaScript variable as follows..
var content=xmlhttp.responseText;
now what I wanted is to pass this value to the php module on same page..
Please suggest me..its urgent
You'll have to make a separate AJAX request to another script to achieve this. PHP is server-sided and therefore cannot directly interact with the client.
You should handle the data (which you are assigning to content) in PHP because, as the other answers here tell you, PHP is server-side and JavaScript is on the client. If you are getting this data from a page you control, instead of var content = xhr.responseText; just modify the data BEFORE you send it. For example, if you are making an AJAX call to a process.php file on your server to get the data you are otherwise assigning to content in JavaScript, be sure to handle the data in process.php PRIOR to echo()'ing the data (which you are then storing inside content on the client):
In process.php:
// below is the normal server script which you are storing in content on the client
// echo $result;
// instead, we are going to operate on the data first:
return doSomething($result);
Then on the client:
var newContent = xhr.responseText;
And the newContent variable will contain the data you previously wished to modify with PHP. If you DO NOT have control of the server script which you are calling with AJAX, then as mentioned here already, you will need to send a SECOND AJAX call to the server with your PHP, and use $_GET or $_POST to retrieve that content data and then play with it there.
Am unclear about your need to pass value from javascript to php.
But I can give you,
A non-recommended but working approach towards your problem:
You said, you are making an Ajax call at first. While processing the corresponding server side php function, Store the response value (value of xmlhttp.responseText) into a $_SESSION variable. Finally Reload the page (using location.reload()) inside the ajax response handler function.
And a recommended approach towards your problem:
You might have added some if-else control-flow structures in the php code and expecting to execute them after getting the ajax response value (sadly you cannot do that). So if you do have some logic like that, then convert those if-else conditions to corresponding Javascript code. May be a javascript function and call that function by passing the ajax response value to it. This new function will use your ajax response value and make changes in some parts of your webpage by applying necessary logic.
I understand...
the disparity between PHP being server-side and Javascript being client-side.
AJAX can patch this issue.
the XMLHttpRequest object is significant.
However, I still can't work out how to pass the variable between the two languages.
Any assistance would be much appreciated!
EDIT: Thanks for your replies so far, I should clarify that I would like to do this without loading a new page.
You need to send an AJAX request containing the value of the variable in the query string or POST body.
The PHP script at the other end of the URL can read the value from the query string or POST body.
you could use JSON with JS and decode it with php, but as the post above states, it involves ajax.
UPDATE: Tutorial found at link
You should give a more detailed example of what you want to accomplish. But if I understand correctly, you want to use a value from your JavaScript code in your PHP code?
You should try using POST or GET parameters to pass values into PHP. For PHP to be able to do anything, you will have to load a new page.
Lets say you have list.php serving a list of posts. You want to "like" a post. Your JavaScript is on this page. When you click "like", an AJAX POST is sent to like.php with POST parameter id=123.
In like.php, you get the value from the request (using $_POST['id'] or something more appropriate), do your magic (save to db) and echo some result, json_encode(array('success' => true)) for example.
The JavaScript-code that called like.php can then use it's callback to check if the "like" was a success or not and display feedback. The like.php could be any page, you could use list.php if you'd want. I used like.php for clarity.
If this is not at all what you wanted, please provide more information.
If you haven't looked at jQuery framework for javaScript, do it.
If you have a variable called city in JS, you can pass it to the file.php by using
var city = "London";
$.get("file.php", {location:city} );
Which is a HTTP GET request.
In PHP(file.php), you then grab it by using
$city = $_GET['location'];
echo $city; //London
I am new to AJAX/jQuery with PHP.
I am trying to call a PHP script via AJAX using XMLHttpRequest or jQuery. In both cases the call fails because the php file I am calling into contains on the very first row the following check
if (!defined("SOMETHING")) { die("Error. You cannot access this file directly");}
which causes that my call fails, because this variable is not defined in this case as I am calling from the outside. This condition just checks if the caller is the same web application or wheather the call comes from outside (then it will be denied).
Is there a workaround for it without removing this check? Can I somehow set this expected variable using AJAX/jQuery?
Is there a way how to call specific PHP method via AJAX without calling into the whole PHP file?
Thanks in advance
Tomas
Hmm... you can do it, but I am not sure if this is secure or the way you would like it to be.
Your jQuery should post a variable with GET or POST, which you should check on PHP side. If you have received that variable, then define SOMETHING.
Here is your jQuery, using the POST method:
$.post('ajax.php', {SOMETHING: true}, function(ret){
// do whatever you like with the return here
});
Here is your PHP, which will define SOMETHING if it receives a $_POST request with the variable SOMETHING in it.
<?php
if(isset($_POST['SOMETHING'])){
define('SOMETHING', true);
}
if (!defined("SOMETHING")) { die("Error. You cannot access this file directly");}
// do anything you like here
?>
Ok so trying to get a page together that needs to connect to our SQL database. So on the javascript page I have functions that will autocomplete a textbox with data out of our mysql DB and then I need to send it to other functions and classes so that it will then look in our SQL DB and return some data. The problem I have is trying to get the .GET call to call in the php page, with the function that calls the class in which I need to get into for the SQL call. I have it setup somewhat but trying to figure out how to send the data through with it as well as just get clarification on how to work the .GET function.
Javascript page:
$.get("dsl_validate.php", calldsl(job));
Php Page
function calldsl($job){
var $dsljob = $job
hasfunctioncode($dsljob);
}
The hasfunctioncode function is in my DSL class page that will return the info I need. Any help on if I am in the right direction or not?
It looks like you're trying to physically call the PHP function calldsl() from the JavaScript. This... isn't right. (I'm assuming the $.get() you're using is from jQuery, please correct me if that assumption is incorrect.)
What $.get() does is simply call a resource on the web server. It doesn't have any knowledge of the server-side code (nor should it, for a number of reasons). From the perspective of the server-side code, there's no difference between a page being called via $.get() vs. one that's just loaded in a web browser.
What you essentially need to do is create a PHP page which accepts arguments either as a form post or query string (if you're using $.get() then the query string is the way to go), does its server-side logic, and then simply outputs the results to the "page." In the case of calling the page via AJAX as you are here, it's a good idea to render the page content using JSON notation. (Don't forget to set the content-type header to "application/json" as well.)
Then what you're getting on the client-side from the $.get() call is the response body, which would be that JSON data. It's really just a "page" like any other, the only difference is the content-type telling the browser that it's JSON data and that it doesn't have HTML, just JavaScript objects. The success callback on the $.get() call (the function you pass it, or create in-line) would receive that response data as an argument and can do what you need to with it.
The way I understand jQuery.get(), the second argument is the "callback" (http://api.jquery.com/jQuery.get/). The callback will hand the results from your server therefore should be a function. Currently your code actually executes the function "calldsl" where you should be only passing a reference like so...
Javascript:
$.get("dsl_validate.php", function(response){
alert("yay I haz ajax! "+response)
});
PHP: "dsl_validate.php"
echo "this is some data from the server";
No, your are not in the right direction. The first parameter of the get method have to br the complete URL of the page, not just the script (this works if the script resides on the same directory of the javascript file, though). The .php file shall return somehting "usable" for you javascript (JSON, or HTML, or text, or... whatever). The "calldsl" function will be called AFTER the data has been returned from the call. Something like that:
$.get('dsl_validate.php?value=somevalue', function(data) {
alert("Data returned from dsl_Validate: " + data)
});
i think you are better off passing the function as a param to your php page
$.get("dsl_validate.php?calldsl="+job, function(data) {
$response = $(data);// create a jquery object from the response
});
`
and in your php file
create a switch statement that call the function based on the parameter
Mmm I think you are wrong, the second argument on your get function is the javascript function that will process de data returned by "dsl_validate.php". I mean, if that page returns "foo", job will contain "foo".
But in my experience is better to use the autocomplete plugin from Jquery UI
jquery autocomplete plugin
Another question by a newbie. I have a php variable that queries the database for a value. It is stored in the variable $publish and its value will change (in the database) when a user clicks on a hyperlink.
if ($publish == '') {
Link to publish.html
} else {
Link to edit.html
}
What is happening in the background is i am querying a database table for some data that i stored in the $publish variable. If the $publish is empty, it will add a link for publish.html in a popup. The popup will process a form and will add the data to the database and which means that the $publish is no more empty. What i would like to achieve is that as soon as the form is processed in the popup and a data has been added to the database, the link should change to edit.html. This can happen when the page will re-query the database but it should happen without page refresh.
How can it be donw using javascript, jquery or ajax?? Please assist.
Javascript by itself cannot be used to deal with database. That is done using php (Or the server side language of your choice). Ajax is used to send a request to your php script using javascript which will in turn communicate with the db. And it doesn't require a page refresh.
So what you are trying to do can be easily achieved using ajax. Since you mentioned jquery, you can check out the $.ajax or $.post methods in jquery which make the process even more simple.
You need to process the form using ajax. The ajax request is sent to a php script which will make the necessary changes in the database and send the new link (link to edit.html) in the response. Upon getting the response, just replace the current anchor element with the new one ..
for eg..
$.post(url, formdataobject , function (resp) {
$("a.youra").text('edit').attr('href', resp);
});
url - where the php script is located
formdataobject - a javascript object that will have the form data as key value pairs
the third parameter is an anonymous function also known as callback function since it will be invoked only when the response is received from the server. This is because ajax requests are asynchronous.
Inside the callback function, jquery is used to change the text inside the anchor element to edit and the href attribute is changed to value that came in the response.
$.post means we are using the post method. so the parameters can be accessed as elements of $_POST array in php.
After updating the db, you can simply echo out the new link and it will be received in the response.
Also, there are other formats in which you can get the response for eg. xml, json.
I'll try to leave the technical jargon aside and give a more generic response since I think you might be confused with client-side and server-side scripting.
Think of javascript as a language that can only instruct your WEB BROWSER how to act. Javascript executes after the server has already finished processing your web page.
PHP on the other hand runs on your web server and has the ability to communicate with your database. If you want to get information from your database using javascript, you'll need to have javascript ask PHP to query the database through an AJAX call to a PHP script.
For example, you could have javascript call a script like:
http://www.myserver.com/ajax_function.php?do=queryTheDatabase
In summary: Javascript can't connect to the database but it can ask PHP to do so. I hope that helps.
Let me try, you want to change the link in a page from a pop-up that handles a form processing. Try to give your link a container:
<div id="publish_link">Publish</div>
As for the form submission use Ajax to submit data to the server to do an update and get a response back to change the link to edit or something:
$.post("submit.php", { some_field: "some_value"}, function(response) {
if(response.isPublished)
$('#publish_link', window.opener.document).html('Edit');
});
Basically your publish link is contained in a div with an ID publish_link so you change its content later after data processing without reloading the page. In the pop-up where you would do the form processing it is done using jQuery Ajax POST method to submit the data. Your script then accepts that data, update the database and if successful returns a response. jQuery POST function receives that response and there's a check there if isPublished is true, get the pop-up's opener window (your main window) and update the link to Edit. Just an idea, may not be the best out there.
It cannot be made with javascript, jquery or ajax. only server side script can query a database. with ajax request you can get the script output. ajax requests can be sent either with pure javascript or jquery.
Well, i think i understand your quaestion, but you have to get a starting point, try to understand this:
try to understand what are client variables and server variables.
javascript does not comunicate with database.
you can use javascript to retrieve data to a specific "Object variable".
Using ajax methods of jquery you can post that data do other page, that will execute the
proper actions
you can ;)
at first you must create php file to query database and return something like true or flase and then with file url check the function and get answer
function find_published(folder_id) {
var aj_url = "{{server_path}}/ajax/url"
var list;
$.getJSON(aj_url+"?callback=?&",
function(data) {
//here is your data... true false ... do every thing you want
}
);
};
this app for node.js does mysql queries https://github.com/felixge/node-mysql
You need to use AJAX for this, like .post() or .get() or JSON.