I have made a method which will delete a file.
first i echo the url to this file.
like this
echo "<a href='$fulr'>$filename</a>";
now basicaly i want to call the function deletefile($file);
how can i do it like this
echo "<a onclick='$this->deletefile($filename)' href='$fulr'>$filename</a>";
is that even posible?
Or how can i implement something similiar inside the php code?
You seem to have the wrong idea about browser/server communication. You need to either do:
<?php
...
printf("<form name=\"delfilefrm\" action=\"delfile.php\" method=\"POST\">
<input type=\"hidden\" name=\"delfile\" value=\"%s\" />
<input type=\"submit\" value=\"Delete %s\" />
</form>", $filename, $filename);
...
?>
In the server, so that the link goes to a script on the server, or use JavaScript. I would recommend using jQuery's post() function or a similar AJAX function:
$.post("delfile.php", { file: \"$filename\" } );
Remember: security, security, security ... then graceful degradation
And thanks waiwai933, David Dorward for allowing me to "see the wood for the trees" on a fundamental point quickly forgotten.
In this instance, the PHP runs on the webserver and sends some output to the browser.
The browser then processes that output as JavaScript.
There is no way to directly access the PHP. You have to send an HTTP request back to the server.
This could be a simple link (but don't do that for a delete file operation, GET operations should be safe (or else a bot will walk over your site and delete everything), a form, or if you really want to involve JavaScript - XHR (or some other object that can be used to perform Ajax). Libraries such as YUI or jQuery can help you with the heavy lifting here.
Either way (form or Ajax), you'll probably end up putting the data about what file you want to delete in the POST data. Your PHP script will read this (from $_POST and call the function you want).
… and if you do go down the Ajax route, don't forget to build on things that work.
You can't call PHP code from your Javascript.
What you CAN do is (assuming this is happening on a web server) place a GET/POST to a PHP script, passing in any necessary parameters, to execute the right PHP method.
From within PHP, it's a bit easier. If you're spitting out HTML, you can add a script node to invoke a Javascript function (or just run some Javascript).
You can't do it in that way because javascript cannot execute php code and you cannot delete a file with javascript so i think that you must do something like this:
if(isset($_GET['delete'])) unlink($_GET['delete']);
....
echo "<a href='".__FILE__."?delete=$fulr'>$filename</a>";
You can do this:
php: lets call it deletefile.php
<?
$file = $_POST['filename'];
deletefile($file);
?>
jQuery:
$('a').click(function(){
$.ajax({
method: 'POST',
url: 'deletefile.php',
data: "filename=" + $(this).text(),
success: function(data) {
alert('File deleted.');
}
});
return false;
});
html:
<a href="#" >filename<a/> <!-- filename is the name of your file... -->
You can't call PHP code from your Javascript.
but u can use xajax for doing it
or check this post.
this will be better solution using ajax
If you want to call PHP functions from Javascript then this is about as close as you can get: http://www.phplivex.com/
I'ved used this lib many times and I really like it.
Related
i have javascript as below
html="<th>"+<?php echo __(); ?>+"</th>";
I want to add another javascript variable inside to __() function like this
<?php echo __(<js varible>); ?>
I tried
var myvarible=200;
html="<th>"+<?php echo __("'"+myvarible+"'"); ?>+"</th>";
console.log(html);
not working for me
can any one help me please
regards
You have a misunderstanding on how server side and client side code work.
The only way that you could possibly achieve what you are trying to do (apply a PHP localization function to a Javascript variable) would be like this (this code assumes you are using JQuery but can be done without it too):
var myvariable = 'hello';
$.get('http://yoursite.com/localize.php?text='+myvariable, function(localizedText) {
html = "<th>"+localizedText+"</th>";
console.log(html);
});
And then localize.php should look like this:
<?php
include('you localization library');
echo __($_GET['text']);
?>
Explanation: while your client side code (Javascript) is been executed in the browser it will call a URL which will execute your server side code (your PHP __(); function) in the server and then return the value to the client side code.
var myvarible=200;
html="<th>"+<?php echo __("'"+myvarible+"'"); ?>+"</th>";
console.log(html);
This would try to put the PHP variable "myvariable" into the script tag, what you want is closer to:
var myvarible=200;
html="<th>"+"<?php echo __("'myvarible'"); ?>"+"</th>";
console.log(html);
However, in this case, why not just skip PHP completely?
var myvarible=200;
html="<th>" + myvarible + "</th>";
console.log(html);
Javascript runs on client side and php on server side.
So var myvarible=200;
will be executed only on client side .
but will be get executed on server side. at that time myvariable will not be valid.
PHP is executed on the server, JS on the client. You cannot expect PHP to parse JS, in fact PHP will never see the JS statements, because they will be processed only once the server has processed the PHP.
var myvariable='<?php echo __("200"); ?>';
html="<th>"+myvariable+"</th>";
console.log(html);
However for this to work the javascript would need to be in a .php file that is being interpreted.
The OP wants to include a JS variable in a PHP call, which is not possible, unless you use AJAX. And you'll agree with me that code like this is only meant to cause big headaches and should be avoided at all costs.
Well yes and no.. i wouldnt do it this way. I use a helper that lets me do things like this in a consistent way. In my view file i have something like:
<?php js_call('jslib.myFunction(?,?)', __($value), 'some other value'); ?>
js_call its similar to using sprintf or a prepared statement except for js. The params are run through json_encode so the quoting and what not are correct. All these are stored in an array and then in the layout, just before my </body> i call:
<?php include_js_calls(); ?>
which then takes all the calls ive made with a js_call and outputs the string values inside a script tag resulting in something like:
<script type="text/javascript">
jslib.myFunction('first value', 'some other value');
</script>
Borrowed this brilliance from Apostrophe Cms
To do localization in javascript (for whatever reason), echo __() can obviously not be called directly.
There are different possible strategies
Include a localization string table in javascript when the page loads. Do lookup against it when needed. This table could be generated on server-side using echo __() then cached.
Make ajax requests for server-localized data. Might not be suitable for frequent updates.
For example:
$(document).ready(function(){
$('.selector').click(function(){
<?php
// php code goes here
?>
});
});
Will this cause issues or slow down the page? Is this bad practice? Is there anything important that I should know related to this?
Thanks!
If you are trying to bound some PHP code with the click event then this is impossible in the way you are trying and PHP code will be executed as soon as page load without waiting for a click event.
If you are trying to generate final javascript or jquery code using PHP then this is okay.
It won't slow down the page; the PHP runs on the server and emits text which is sent to the browser, as on any PHP page. Is it bad practice? I wouldn't say "bad" necessarily, but not great. It makes for messy code - in the event where I need to do something like this, I usually try to break it up, as in:
<script>
var stuff = <?php print $stuff; ?>;
var blah = "<?php print $blah; ?>";
// Do things in JS with stuff and blah here, no more PHP mixed in
</script>
PHP is executed on the server, and then the javascript will be executed on the client. So what you'd be doing here is using php to generate javascript that will become the function body. If that's what you were trying to do then there's nothing wrong with doing it.
If you thought you were going to invoke some PHP code from javascript, then you're on the wrong track. You'd need to put the PHP code in a separate page and use an ajax request to get the result.
Sure, as long as you keep in mind that PHP code will be executed by the server before the page is sent out. Other than that, have fun.
PHP is a "backend" language and javascript is a "frontend" language. In short, as long as the PHP code is loaded through a web server that understands PHP - the downside is that you have to inline the JS, losing caching ability (there are workarounds to parse php in .js files but you shouldn't really do this). To the user it will just look like javascript and HTML. Here's the server order:
User requests page.
Apache (or equivalent) notices this
is a php file. It then renders all
the php that are between php tags.
Apache sends the page to the user.
User's browser sees the JavaScript
and executes it.
Just be sure the PHP is outputting valid JavaScript.
you have a better choice to use ajax that runs the php script when you are handling a click event
$(document).ready(function(){
$('.selector').click(function(){
$.ajax({url:"phpfile.php",type:"POST",
data:"datastring="+value+"&datastring2="othervalue,
,success:function(data){
//get the result from the php file after it's executed on server
}
});
});
});
No it's not. Just as long as you know that the JS is executed after the PHP page is parsed.
I was wondering how i could achieve using <?php?> in javascript for url's? There's a certain route you have to go, Anyone know?
the normal way for example:
$fetchContent = $('#div').load('website/members #content');
What i'm trying to do:
$fetchContent = $('#grav').load('<?php?> #poppu');
Yep, thats wrong as hell lol, but i'm sure someone knows
I would also like to know how to tie php with javascript, but thats probably a whole new topic
You said it right :)
Yep, thats wrong as hell lol, but i'm
sure someone knows
Anyway, from your php script, output the url as a javascript code anywhere in the script before the javascript used for ajax call, e.g.
<?php
echo '<script language="javascript"> var g_ajax_url = "'. $the_url . '";</script>';
?>
and in your javascript, use it this way
$fetchContent = $('#grav').load(g_ajax_url + ' #poppu');
What it simply does is define g_ajax_url as a global variable with the proper php value, and you can use that variable in your js as you use other variables.
To tie php with js directly, try looking into xmlrpc topic.
If javascript is in .php file you can use <?php echo $url ?> and if the file is .js you can't use <?php ?>
It is not clear to me what you are trying to achieve. I assume you are using the jQuery load() function, if yes, you should state so.
You can't load php during javascript execution because the php has already been processes and rendered as HTML and sent back to the client. As PHP is processes on the server it is logical that you cannot run it on the client side.
You could of course send an AJAX request to the server that runs a certain php page and you will be able to use the response as you please.
you can't necessarily "tie" them together because they operate in two different spectrums of processing, php being processed on the server, and javascript being processed in the browser.
You can however render javascript within a php file.
if your javascript is included within a <script> tag within your php page your example should work should actually work. The php would render the urls into the script before it is sent to the browser.
if you are wanting to load external javascript files with php inlcuded urls, you will need to set the proper headers and include the php file just as you would a normal .js file.
good article on this topic HERE
You cannot execute <?php ?> inside JavaScript, but inside PHP you can declare a global variable as:
var x = '<?php echo x;?>';
or, if it's an array, store it as JSON:
var x = <?php json_encode(x); ?>
then access the JavaScript variables inside the external JavaScript.
I want to call a PHP function when pressing on a button, sort of like:
<?php
function output(){
// do something
}
?>
<input type="button" value="Enter" onclick="output()"/>
I tried to make something like:
<input type="button" value="Enter" onclick="test.php?execute=1"/>
where test.php is current page and then by php
<? if(isset(&execute)){ echo "Hello"; } ?>
but it doesn't work.
Since PHP runs on the webserver, and buttons (and JavaScript in this case) appear on the client, you have to make an HTTP request to the server.
The easiest way to do this is to use a form. No JavaScript is required. You can add JavaScript (although it should be layered on top of a working non-JS version). Using JavaScript to make an HTTP request without leaving the page is known as Ajax, and generally achieved with the XMLHttpRequest object. There are various libraries such as YUI and jQuery that can do some of the heavy lifting for you.
I think using an AJAX call would do sort of what you are asking. I don't know PHP very well but you can use the following example, and add another variable with the data you are passing in to the server to indicate which function you want to call on the server. On the server you can add some "IF" statements that will call a certain function based on the name passed in and return the result.
Here is what you could use on in your javascript client using the jQuery library as a helper to do the AJAX call:
<input type="button" value="Enter" onclick="output()"/>
<script type="text/javascript">
function output(){
$.ajax({
type: "POST",
url: "submit_data.php",
data: "username=" + "SomeUser"
+ "&email=" + "someEmail#google.com"
+ "&functionName=" + "theFunction1",
success: function(html){
alert('sucess! Result is:' + html);
}
});
}
</script>
and you can use code such as this to catch the data your javascript is passing in. In this example you would want to call this file name as "submit_data.php" to match the javascript above:
<?php
// Variables
$Username = $_POST['username'];
$Email = $_POST['email'];
$FunctionName = $_POST['functionName'];
//Add code here to choose what function to call and echo the result
// If $FunctionName equals 'theFunction1' then execute theFunction1
// If $FunctionName equals 'theFunction2' then execute theFunction2
echo "You called A Page!";
?>
Here I am doing nothing with the "username" and "email" simply grabbing it and storing them into holding variables. But you can easily add extra functionality here, such as checking for a name of a function that you want to run.
PHP is server side and javascript is client side. So I'm not sure if that is really what you want to be doing??
Perhaps you could explain why you want to specifically call a php function?
I googled PHP function from button and found this question on webdeveloper.com
It doesn't use Javascript.
This is PHP you're talking about, not ASP.NET. In PHP, there is no such thing as a button click event. PHP runs entirely on the server and has absolutely no knowledge of client-side events.
Your first try won't work because the PHP code only runs when the page first loads. It does not run when you call a JavaScript function. Your second example won't work because JavaScript and PHP can't talk directly to eachother like that. Trying to directly call a PHP function from JavaScript just doens't make sense. Remember, PHP only runs on the server. By the time you get to the point where JavaScript can run, the PHP code has long since completed its work.
If you want to do something when a button is clicked, you have to explicitly make a request back to the server. You can do this by just POSTing the form as CTphpnwb suggested. Just be aware that this will reload the page and you will have to manually save and restore the page state, e.g. repopulate input boxes. There is no built-in magic that will do this for you.
Alternatively, you can get all AJAXy and do the POST in JavaScript. However, you will have to write the JavaScript to send the request and process the response, and write the server-side PHP code to handle the request. This gets a little awkward to do in a single page.
From : http://www.dreamincode.net/forums/showtopic72353.htm
You cannot directly invoke a PHP function from Javascript this way :
PHP code is executed on the server
HTML / Javascript are interpreted on the client-side.
One the HTML page has been generated and sent to the client (the browser), there is nothing more PHP can do.
One solution would be to use an Ajax request :
Your onclick event would call a Javascript function
This Javascript function would launch an Ajax request : a request sent to the server
The server would then execute some PHP code
And, then, return the result of that execution to the client
And you'd be able to get that result in your Javascript code, and act depending on what was returned by the server.
There are plenty of solutions to do an Ajax request :
You can re-invent the wheel ; not that complex, I should say -- but see the next point
If already using a Javascript framework, like jQuery, Prototype, ... Those provide classes/methods/functions to do Ajax requests
Googling a bit will get you lots of tutorials/examples, about that ;-)
I need to set a PHP $_SESSION variable using the jQuery. IF the user clicks on an image I want to save a piece of information associated with that image as a session variable in php.
I think I can do this by calling a php page or function and appending that piece of info to the query string.
Any ideas. I have found little help through google.
thanks
mike
You can't do it through jQuery alone; you'll need a combination of Ajax (which you can do with jQuery) and a PHP back-end. A very simple version might look like this:
HTML:
<img class="foo" src="img.jpg" />
<img class="foo" src="img2.jpg" />
<img class="foo" src="img3.jpg" />
Javascript:
$("img.foo").onclick(function()
{
// Get the src of the image
var src = $(this).attr("src");
// Send Ajax request to backend.php, with src set as "img" in the POST data
$.post("/backend.php", {"img": src});
});
PHP (backend.php):
<?php
// do any authentication first, then add POST variable to session
$_SESSION['imgsrc'] = $_POST['img'];
?>
Might want to try putting the PHP function on another PHP page, and use an AJAX call to set the variable.
Whats you are looking for is jQuery Ajax. And then just setup a php page to process the request.
A lot of responses on here are addressing the how but not the why.
PHP $_SESSION key/value pairs are stored on the server. This differs from a cookie, which is stored on the browser. This is why you are able to access values in a cookie from both PHP and JavaScript.
To make matters worse, AJAX requests from the browser do not include any of the cookies you have set for the website. So, you will have to make JavaScript pull the Session ID cookie and include it in every AJAX request for the server to be able to make heads or tails of it. On the bright side, PHP Sessions are designed to fail-over to a HTTP GET or POST variable if cookies are not sent along with the HTTP headers.
I would look into some of the principles of RESTful web applications and use of of the design patterns that are common with those kinds of applications instead of trying to mangle with the session handler.
I also designed a "php session value setter" solution by myself (similar to Luke Dennis' solution. No big deal here), but after setting my session value, my needs were "jumping onto another .php file". Ok, I did it, inside my jquery code... But something didn't quite work...
My problem was kind of easy:
-After you "$.post" your values onto the small .php file, you should wait for some "success/failure" return value, and ONLY AFTER READING THIS SUCCESS VALUE, perform the jump. If you just immediately jump onto the next big .php file, your session value might have not become set onto the php sessions runtime engine, and will you probably read "empty" when doing $_SESSION["my_var"]; from the destination .php file.
In my case, to correct that situation, I changed my jQuery $.post code this way:
$.post('set_session_value.php', { key: 'keyname', value: 'myvalue'}, function(ret){
if(ret==0){
window.alert("success!");
location.replace("next_page.php");
}
else{
window.alert("error!");
}
});
Of course, your "set_session_value.php" file, should return 'echo "0"; ' or 'echo "1"; ' (or whatever success values you might need).
Greetings.
in (backend.php) be sure to include include
session_start();
-Taylor
http://www.hawkessolutions.com
Similar to Luke's answer, but with GET.
Place this php-code in a php-page, ex. getpage.php:
<?php
$_SESSION['size'] = $_GET['size'];
?>
Then call it with a jQuery script like this:
$.get( "/getpage.php?size=1");
Agree with Federico. In some cases you may run into problems using POST, although not sure if it can be browser related.
It works on firefox, if you change onClick() to click() in javascript part.
$("img.foo").click(function()
{
// Get the src of the image
var src = $(this).attr("src");
// Send Ajax request to backend.php, with src set as "img" in the POST data
$.post("/backend.php", {"img": src});
});