Calling a PHP variable in jQuery
I’am developing a zoom tool in my shopping cart and I am stuck on how to call a PHP variable in a jQuery function. Here’s my code :
jQuery(document).ready(function($)< $('#image1').addimagezoom(< // single image zoom zoomrange: [3, 10], magnifiersize: [800,300], magnifierpos: 'right', cursorshade: true, largeimage: "php variable" //we add the directory of the image. >); >); $src ="images/products/".mysql_result($execute_select_product_query,0,'image1')." 5 Answers 5
You have two or three options: if the Javascript is in the php file, you can
Otherwise if the Javascript is anywhere at all, you can do:
jQuery(document).ready(function($) < $('#image1').addimagezoom(< // single image zoom zoomrange: [3, 10], magnifiersize: [800,300], magnifierpos: 'right', cursorshade: true, largeimage: //we add the directory of the image. >); >); jQuery(document).ready(function($)< $('#image1').addimagezoom(< // single image zoom zoomrange: [3, 10], magnifiersize: [800,300], magnifierpos: 'right', cursorshade: true, largeimage: $('#phpVar').val(); //we add the directory of the image. >); >); Note that this will only work if your PHP script actually outputs JavaScript inline or serves up the JS as text/javascript .
He have not mentioned that, so as per normal understanding it seems that his function is in the same PHP file.
PHP is server side language and javascript is user side language. Don’t mix it. Just use ajax. Or if you have included your script into the PHP file, you can write it to code:
jQuery(document).ready(function($)< $('#image1').addimagezoom(< // single image zoom zoomrange: [3, 10], magnifiersize: [800,300], magnifierpos: 'right', cursorshade: true, largeimage: "" //we add the directory of the image. >); >); var phpvar = $("body").attr("data-phpvar"); Depending on which version of jQuery he’s using, you can also do. var phpvar = $(«body»).data(«phpvar»);
Use a PHP variable in JQuery
How can I make it so the variable is valid in that JQuery part?
4 Answers 4
PHP runs on the server, jquery runs on the client. If you want a PHP variable to be available to jquery (and by extension, the underlying javascript engine), you’ll have to either send the variable’s value over at the time you output the page on the server, e.g.
or retrieve the value via an AJAX call, which means you’re basically creating a webservice.
+1 for json_encode; I think it’s crucial that if we’re going to discuss printing a variable as JS code that we discuss how to avoid breaking it 🙂
What you could simply do is use your PHP to echo out the code to initiate a JavaScript variable.
Once the PHP code is parsed, and the HTML is sent to the user — all they will see is the result of the PHP echo —
Now your phpVariable is available to your JavaScript! So you use it like you would in any other case —
That will retrieve us any element with a foo class —
Its Really old but now I’m getting javascript Error in your code «Uncaught SyntaxError: Unexpected token < "
@IrtzaShahan — this means that there was a mistake when inserting the variable into the javascript. Make sure that you wrap your php variable with quotes so that the end result that you echo onto the page will look like normal javascript. Remember that the browser still needs to read and use the javascript values that you created.
How to access PHP variables in JavaScript or jQuery rather than [duplicate]
I know I can store some variables in cookies, and access these values via cookies, but values in cookies are relatively stable values. Moreover, there is a limit, you can not store many values in cookies, and the method is not that convenient. Is there a better way to do it?
if you are going to mark things as ‘dups’ post links to those threads, otherwise its just postcount ++.
6 Answers 6
Your example shows the most simple way of passing PHP variables to JavaScript. You can also use json_encode for more complex things like arrays:
Other than that, if you really want to «interact» between PHP and JavaScript you should use Ajax.
Using cookies for this is a very unsafe and unreliable way, as they are stored clientside and therefore open for any manipulation or won’t even get accepted/saved. Don’t use them for this type of interaction. jQuery.ajax is a good start IMHO.
You have quotes round and I think that’s right. But you have quotes round as well, and I think that’s wrong — json_encode() returns valid javascript, so you don’t want to quote it, surely?
There is no PHP/JavaScript interaction in just one file. For one file, there is only one-way PHP -> JavaScript.
If AJAX isn’t an option you can use nested data structures to simplify.
'asd', 'asd' => array( 1 => 2, 3 => 4, ), 'zxc' => 0, ); ?> You’re asking kind of a two-part question. As far as syntax (I think since PHP4?) you can use:
. if PHP is configured to allow it. And it is on most servers.
As far as storing user data, you also have the option of storing it in the session:
for persistence from page to page. You could also of course use a database. You can even have PHP store the session variables in the db. It just depends on what you need.
As you say, this syntax is configured on most servers, but not all. For truly portable code, I’d still recommend using the full
@Karsten: I wasn’t suggesting that you do. I was just suggesting using session variables instead of cookies, when cookies aren’t necessary. You would still have to echo them inside your script, of course.
I ran into a similar issue when building a custom pagination for a site I am working on.
The global variable I created in functions.php was defined and set to 0. I could output this value in my javascript no problem using the method @Karsten outlined above. The issue was with updating the global variable that I initially set to 0 inside the PHP file.
Here is my workaround (hacky? I know!) but after struggling for an hour on a tight deadline the following works:
Inside archive-episodes.php:
Inside functions.php
max_num_pages; // In my testing scenario this number is 8. echo ''; ?> To keep it simple, I was outputting the totalPageCount variable in an $ajax.success callback via alert.
$.ajax(< url: ajaxurl, type: 'POST', data: , beforeSend: function() < $(".ajaxLoading").show(); >, success: function(data) < //alert("DONE LOADING EPISODES"); $(".ajaxLoading").hide(); var $container = $("#episode-container"); if(firstRun) < $container.prepend(data); initMasonry($container); ieMasonryFix(); initSearch(); >else < var $newItems = $(data); $container.append( $newItems ).isotope( 'appended', $newItems ); >firstRun = false; addHoverState(); smartResize(); alert(totalEpiPageCount); // THIS OUTPUTS THE CORRECT PAGE TOTAL > Be it as it may, I hope this helps others! If anyone has a «less-hacky» version or best-practise example I’m all ears.
get variable to jQuery from php
So what’s the problem? Simply echo it out from your page. Your ajax request will receive it as a response.
if you are wanting to get the response from settings.php you have to add in a callback function after your data variables list, api.jquery.com/jquery.post
4 Answers 4
If you want to communicate between JavaScript and PHP, the best way is to create a hidden-inputfield in fill in the errors-variable. And then you can read out the value with jQuery.
var errors = $("input#errors").val(); You can’t place PHP code inside «javascript» file, PHP code must be in PHP file. The below code can work if it’s placed in .php file:
I am assuming that your $error will by different depending on the $_POST values. If your response header is in HTML, then you can do something like this.
// in your JS codes. $.post('settings.php', function(response) < $('#show').html(response).fadeIn(500).delay(2000).fadeOut(500); >); // in your php codes. else < echo("setting saved"); >die(); ?> Anything you want in your js from server side has to come as AJAX or JSON response. echo it from your php function and get it as AJAX or JSON in javascript.
$.getJSON('url for the php file', function(data)<> And in the php file just echo the value
Or take a hidden input field and put the value there. You can get that value from js using the ‘id’ or ‘class’ attribute
How do I refer to a php variable in jQuery?
I’m a complete beginner with jQuery and I have this bit of script here and I want to mix jQuery with PHP. I have Courses and in those Courses are Lessons. A Teacher is assigned to teach a Course. What I want is a link where if I press it a popup appears and in it shows the Lesson details or Course details. My problem is that I will be having multiple links and thus dialogs/modal windows in a page such that $l[‘id’] and $c[‘id’] will be different. How can I therefore use $l[‘id’] and $c[‘id’] in or with jQuery given that the jQuery script is inside the view file and I’m creating the actual content itself in the controller and passing it onto view. Sorry if I don’t make sense cause I’m still quite confused about all this myself.
view.php Student Hub: Courses for controller.php This is in a foreach loop Lesson Details:
'.$l['name'].' Course Timetable & Resources
'.$c['fullname'].'
'.$c['summary'].'
Upcoming Lessons:
5 Answers 5
Technical answer is you don’t as one is a server-side language and one is a client-side language; you can’t access PHP variables via JavaScript (jQuery). You can, however, drop your PHP variables into your HTML page on generation, and then pick them up with JavaScript or jQuery.
Reading your scenario, I think your over-complicating things. Think of your application; don’t think of the technical aspects, but more the way it should be laid out. I’m guessing you have a students controller, a lessons controller, and a courses controller. Those controllers will have actions, called view or similar, and then these actions will take an ID to display a particular student/course/lesson.
In your HTML page/view/template, you should have just vanilla URLs. JavaScript should then be used to enhance the website. So in your case, I would have mark-up it up similar to as follows:
I’d then, in an external JavaScript file, have a function that listens for a click on the tag and instead of navigating to that URL, instead displays the page content in a pop-up/modal window.
This way, if for some reason JavaScript’s not available then the user will be taken to the course details page. If they do have JavaScript, then they’ll get a fancy modal pop-up.
Hope this helps. If you need anything clearing up then let me know, as I have wrote this in the early hours after a few JD and Cokes!