Works:
function jsUpvote(photo_id, username) {
//var getURL = "http://www.uglyfacez.com/gallery/upvote.php?photo_id=" + photo_id + "&username=" + username;
$.get("http://uglyfacez.com/gallery/upvote.php?photo_id=15&username=user000",
function(returnValue){
// do stuff here
});
}
I wrote the function above to run a php script on the page and pass in the variables photo_id and username to the script through the URL. When I hard code it, as above, it works just fine, but when I give it the javascript variables (as you can see in getURL), it won't work at all. For example, this is what I want to do, but will not work:
$.get("http://www.uglyfacez.com/gallery/upvote.php?photo_id=" + photo_id + "&username=" + username,
function(returnValue){
// do stuff here
});
Why will this not work and what is the solution?
EDIT: I discovered what the problem was. For some reason, including www in my GET url keeps it from receiving a response from the server. Once removed from the URL, it works just fine.
This seems to be an issue regarding cross domain requests.
You can use some solutions such as JSONP or you can load script from different domain (in this case: www subdomain). To see different aspects and settings regarding cross-domain, please go to the .ajax() documentation page (and search for " cross-domain " or " crossDomain ").
The issue is basically a problem connected to same origin policy. On the mentioned documentation page you can read, that:
Due to browser security restrictions, most "Ajax" requests are subject to the same origin policy; the request can not successfully retrieve data from a different domain, subdomain, or protocol.
Script and JSONP requests are not subject to the same origin policy restrictions.
Here is the sysntax for the jquery .get function:
jQuery.get( url [, data] [, success(data, textStatus, jqXHR)] [, dataType] )
something like:
$.get("http://www.uglyfacez.com/gallery/upvote.php", {'photo_id':photo_id,'username':username},
function(returnValue){
// do stuff here
});
try to follow the syntax first put the data on the parameters of the function, I think this link might help you as well:
http://api.jquery.com/jQuery.get/
Or if you still encounter the same problem try to open the link manually on your browser again and check if it returns any error just to be sure that it returns your expected output. :)
Are you setting photo_id and username properly?? More code might help. What's the error message? Are you using Firebug or Chrome to see if you are getting an error?? Seems as though photo_id and/or username are not being passed in properly.
Related
I'm looking for something.
The problem is that I want to make my app do more locally and less remote.
It needs to put a parameter in every request (or websession id)
I tried the following
$.getJSON('http://*******************.com/loginapi.php?uuid=0x1a2b3c4e', function(jd) {
var reg = jd.usrreg;
var uuid = jd.usrpin;
var usrid = jd.usrid;
});
});
That does nothing, on the server side I don't even see a request to that page.
document.write(uuid) does not give anything back, when I go in my browser to the requested page I see the following:
{"usrreg":"0","usrpin":"0x1a2b3c4e","usrid":"0"}
I also tried with form data, so when I press login it sends a request to the server, but I should still get something back like usrreg=0 or 1, because it means the person is not registered, or usrreg=2 for wrong user/pass.
How can I read the value that I get when I open the page?
Cross Domain Request with Ajax are fobidden cause of Same Origin Policy: http://en.wikipedia.org/wiki/Same_origin_policy
So what are you alternatives?
Learn to use AJAX with JSONP - will only work if the other side provides it
Write a PHP bridge running locally that provides the remote data for you
Use postMessage: https://developer.mozilla.org/en-US/docs/Web/API/window.postMessage
I'm no expert in AJAX (or jQuery) but I thought what I was doing was pretty easy yet when I send an ajax request with:
$.ajax ( requestObj );
it doesn't send and I'm hoping someone can help. In order to give context, I've set the "requestObj" up as follows:
//initialise a request object
var requestObj = {};
requestObj.response = 'ajax-response';
requestObj.type = 'POST';
requestObj.url = my_config['ajax-service-list'][service]['url'];
requestObj.data = $.extend ( requestObj.data , {
action: service,
other: parameters,
_ajax_nonce: my_config['ajax-service-list'][service]['nonce']
});
requestObj.global = false;
requestObj.timeout = 30000;
requestObj.success = function ( r ) {
alert ( "Success: " + r );
}
requestObj.error = function ( r ) {
console.log ("FAILURE WITH AJAX Call ( " + JSON.stringify (r) + ")");
}
There's one thing that probably needs explaining. The two references to "my_config" are references to a Javascript variable that I set using Wordpress's wp_localize_script() function. Basically it just provides context about where to find the URL, the NONCE to use, etc. I have tested that the URL and NONCE information is working correctly so that shouldn't be the problem. For example, I put a breakpoint on the browsers debugger on the line after the two references are defined and got these results:
When I call the ajax function it immediately executes the success function and sends in the value of 0. Looking at my PHP error logs though I can see that the request was never sent. What could be getting in the way of $.ajax(requestOb) from actually sending the request?
UPDATE:
Thanks to Michael's sage advice I realised that I am in fact getting a request to go out but as it's running in a local environment the response is coming back lightening fast. Now I am suspecting this has more to with Wordpress configuration. I have hooked into the wp_ajax_[service_name] but it immediately returns 0. I'll re-ask this question with this new information in the wordpress forum.
You should be using a browser inspector to detect if an ajax request is made. Open up the network tab of any inspector, and you can watch requests as they happen. How is the $.ajax() method being instantiated? You may have an issue with that, as opposed to $.ajax().
Once you've used the inspector, look at the $_POST or $_GET data you're sending in the headers section, and then look at the response. Is the HTTP response code 200? If it's 500, then you probably have an error in your PHP controller that receives the request.
If you have PHP CLI, run this to see if you have a syntax error:
php -l path/to/php/controller.php
If you have a non-fatal error in your file, you'll see the error output in the request response.
Try var_dump( $_REQUEST ) at the top of your php file, too, to make sure that the file is receiving the data, and you can inspect it inside the browser-inspector response.
If you have a problem with the program inside of your controller... you've got yourself a new question to post. :)
At first look, it looks like your URL has spaces around get_action_template. That might be an issue.
Also, passing dataType might help.
If not try getting a JSON response without any parameters and post the output
Ok, i've answered this damn question finally. Arrgh. BIG, BIG THANKS to Mathew to who's troubleshooting skills I could not have done without. Anyway, the problem was in the AJAX request and as a result the Wordpress Ajax manager was never respecting the "hooks" I had put into place on the PHP side.
How was my AJAX request off? I had a POST request but the URL had GET variables hanging off of it. The key variable for Wordpress based Ajax requests is the "action" variable. This is the variable which WP's ajax manager uses to distinguish the various services and is the name that you'll be hooking into.
So in the end, my URL was:
http://mysite.com/wp-admin/admin-ajax.php
and my POST variables included:
action: get-action-template
My wordpress hook is:
add_action ( 'wp_ajax_get-action-template' , 'AjaxServiceManager::ajax_handler' );
My sleepless nights may continue but they won't be related to this damn problem anymore. :^)
I am having problems with this topic: Access-Control-Allow-Origin.
I read about it and I found that is possible to get response using php, here
But I don't know how to adapt that code to javascript, I still have the same problem.
I tried this in javascript:
var url ='http://localhost:8080/com.webserver/rest/manage/order?parameter=parameter';
req=Ajax("getResponse.php/?" + url)
if (req.status=200)
alert("hi");
And on php file:
<?php
echo file_get_contents($_GET['url']);
?>
And nothing happends. I tried with ajax, something like:
$.ajax({
url: "http://localhost:8080/com.webserver/rest/manage/order?parameter=parameter",
async: false,
dataType: 'html',
success: function (text) {
alert(text);
}
});
But always same problem....
I read lot of people on internet having the same problem, but no one get a response. I just found 2 ways, using chrome and one option but just recomended for developers and adding headers on server but I don't know where to add them. I am using apache tomcat catalina for that localhost. I have 2 servers, webpage (in xampp) and rest (in tomcat)
Change
req=Ajax("getResponse.php/?" + url)
to
req=Ajax("getResponse.php/?url=" + url)
Bare in mind this is insecure, i could pass anything into the url parameter and your php scripts would use it. Allowing people to read files from your local system as well as get your php script to download malicious files from elsewhere
Edit:
To best way to secure it is to use an actions list, this means that the user never see's the url and can only modify an action word. for example
req=Ajax("getResponse.php/?do=getOrders")
then in php
$actions = array();
$actions['getOrders'] = "http://localhost:8080/com.webserver/rest/manage/order?parameter=parameter";
if(array_key_exists($_GET['do'], $actions))
echo file_get_contents($actions[$_GET['do']]);
Usually you'd want to do more that just translate an action to a url, you may want to pass additional parameters. In this case you could use a switch or a bunch of IF's to check if $_GET['do'] is equal to something and then process it. but it would take hours to give an example of every possible implementation method, so you may want to use google.
Please note: whilst this method is suggest adds 100x more security to your script, its not infallable, especially if you start passing through parameters from users too. Once again use google.
i tried these two codes but it is not functioning.. i only want to ask for the data output from another domain from http://vrynxzent.info/hello.php
first code
$.post("http://vrynxzent.info/hello.php",function(e){
alert(e);
});
second code
alert(askData());
function askData()
{
var strUrlList = "http://vrynxzent.info/hello.php";
var strReply = "";
jQuery.ajax({
url:strUrlList, success:function(html){strReply = html;}, async:false
});
return strReply;
}
is there another way for this? or is it posible to do this? i want the "Hello World!" output to store in a variable in javascript..
Same old same origin policy.
The most common way to solve this is to do query in back-end (php in your case). I.e., browser sends ajax request to your host, which sends requests to other domain, receives response and sends it back to browser.
There're also some options if you own that other domain. JSONP, for example.
edit
Forgot to tell, this jquery plugin allows cross-domain requests through YQL. Tried myself.
http://james.padolsey.com/javascript/cross-domain-requests-with-jquery/
It doesn't work in all cases (in particular, if webmaster has banned robots from his site), but it's still fairly simple and usable.
Because of same origin policy you cannot make ajax requests like this to some other domain,.
i would suggest using a proxy in between,.
for that what you have to do is have a script proxy.php on your own domain and then your ajax request will be
$.post( 'proxy.php' )
then proxy.php would send a request to http://vrynxzent.info/hello.php using curl and send you back the response
By default this does not work because of the "Same Origin Policy."
There are workarounds... see: http://www.ajax-cross-domain.com/
Help, if you can-
The situation:
http://foobar.com includes a remotely hosted javacript file (http://boobar.com/stuff.js).
The goal is to just get an alert from the remotely hosted php script on foobar.com
I have tried the following code in stuff.js:
$.ajax({
type: "GET",
url: "http://www.boobar.com/script.php?callback=?",
dataType: 'jsonp',
success: function(result) { alert(result); }
});
No luck.
$.getJSON("http://www.boobar.com/script.php?jsonp=?",
function(data) { alert(data); }
);
Also no luck.
On the php side I have tried both the following:
return json_encode(array(0 => 'test'));
echo json_encode(array(0 => 'test'));
In Firefox I get a security error. I understand that it thinks I'm violating the security model. However, according to the jquery documentation, I should be able to accomplish this.
The error seems to be a security feature of the Same Origin Policy: to simplify, you can only make AJAX requests for stuff on the originating server (http://foobar.com). One way around this is to make a simple facade on the originating server, e.g.:
<?php
// this file resides at http://foobar.com/getstuff.php
echo file_get_contents('http://www.boobar.com/script.php?callback=?'
. $possibly_some_other_GET_parameters );
?>
Then, from foobar.com, you can make an AJAX request for http://foobar.com/getstuff.php (which in turn makes a HTTP GET request from your web server to boobar.com and sends it back to the browser).
To the browser, the request goes to the origin server, and is allowed (the browser has no way of knowing that the response comes from somewhere else behind the scene).
Caveats:
the PHP config at foobar.com must have allow_url_fopen set to "1". Although this is the default setting, some servers have it disabled.
the request to www.boobar.com is made from foobar.com server, not from the browser. That means no cookies or user authentication data are sent to www.boobar.com, just whatever you put into the request URL ("$possibly_some_other_GET_parameters").
You can get data from another server asynchronously using script tags and json:
<script type="text/javascript" src="http://somesite.com/path/to/page/"></script>
You can use this to dynamically load a remote javascript (by created a new script element and setting the src attribute, then loading into the DOM), which could set a variable. However, you need to really trust the remote site, because the JS will be evaluated without any precondition.
There is a method called window.name transport or window.name method which uses a general browser bug(not sure if this is a bug actually). You make the request through an iFrame and the loaded page puts the information you need to the "name" property of the JavaScript window object of itself.
This method uses a "blank.htm" since it first navigates to the target page and then goes back to the blank.htm page to overcome the "same origin policy" restriction.
Dojo have implemented this and you can find a more detailed explanation here.
Also I have implemented a cross-domain XMLHttpRequest object based on this method in the library I have written which can be found here.
You may not be able to use the library since it will need 1 or 2 additional libraries which can be found here.
If you need further help in implementing it in your style, I'll try to do my best.
So what I ended up doing, since it was just a GET - no data need to be retrieved - I used JQuery to create a hidden iframe with the URL including the variables I wanted to pass set as the source. Worked like a charm. To all who provded feedback - Thanks!
How about this !! Using a php proxy.
Cross-Domain AJAX calls using PHP
http://www.phpfour.com/blog/2008/03/cross-domain-ajax-using-php/
jQuery .ajax also has a setting 'crossDomain'.
http://api.jquery.com/jQuery.ajax/
crossDomain (default: false for same-domain requests, true for cross-domain requests)
Type: Boolean
If you wish to force a crossDomain request (such as JSONP) on the same domain, set the value of crossDomain to true. This allows, for example, server-side redirection to another domain. (version added: 1.5)