I'm trying to use AJAX to send a query to Google Books and display the results on my website. I'm using JQuery to send the request and handling the response, like so:
var query = [formatted input from a form];
var URL = "http://books.google.com/books/feeds/volumes?q="+query+"&start-index=1&max-results=5";
$.ajax({
type: "GET",
url: URL,
dataType: "xml",
success: function(data, status){
alert(status);
}
});
Currently, I just have the script alerting "success" if a response is received. If I use my script to send that query to a local page for testing, this works just fine. But when I set the URL to the Google one listed above, as instructed on the Developer API page, I never see the alert. According to Firebug, I am receiving a response and a status of 200 ok as I should, but it's not getting to that "success" path. Does anyone know why?
Edit: I should add that if I follow the URL directly, to http://books.google.com etc. with some random q, it displays the feed XML with no problems, so the query is not the issue.
You can't make cross-domain requests using XMLHttpRequest under the standard browser security settings. One possible solution is to write a local proxy function (assuming you can create server-side code) that forwards the query to the external site, and then returns the response.
Edit: It looks like Google provides a JavaScript API as well. I would assume that they've crafted in such a way to avoid the cross-domain XHR issue.
http://code.google.com/apis/books/docs/js/devguide.html#execute
Edit: The JavaScript API for books was deprecated. While it's no longer practically useful, you can see the original referenced documentation text via the Wayback Machine archive: http://web.archive.org/web/20120414070427/http://code.google.com/apis/books/docs/js/devguide.html#execute
It's a cross-domain problem with ajax calls because browsers have a security model based on a domain policy.
if you don't wan to include the whole Google Books API, you can also use Google Ajax API with jsonp for cross-domain ajax calls.
Docs here:
http://code.google.com/apis/books/docs/js/jsondevguide.html#basic_query
jQuery example
var query = 'jquery';
var URL = 'https://ajax.googleapis.com/ajax/services/search/books?v=1.0&q=' + query;
$.ajax({
type: 'GET',
url: URL,
dataType: 'jsonp',
success: function( data, status ){
alert( data.responseData.results.length + ' results found!' );
},
error: function() {
alert( 'Something goes wrong!' );
}
});
Ciao!
Related
I am trying to retrieve a JSON from this URL
http://www.iheartquotes.com/api/v1/random?format=json
via jQuery. I know the solution is JSONP, but since I have no control over the response text of the service or to wrap it in my own callback function, my aim is to somehow retrieve the response of the above URL using client-end scripts.
I have tried almost all the methods suggested from several answers from StackOverflow.
These are the code blocks I have tried and the response's I've got.
1 . A direct call which returned the expected Access-Control-Allow-Origin error
$.getJSON("http://www.iheartquotes.com/api/v1/random?format=json",
function(data) {
alert(data);
});
Response:
XMLHttpRequest cannot load
=1376682146029">http://www.iheartquotes.com/api/v1/random?format=json&=1376682146029.
Origin http://stackoverflow.com is not allowed by
Access-Control-Allow-Origin.
2 . The above code with the callback parameter added:
$.getJSON("http://www.iheartquotes.com/api/v1/random?format=json&callback=?",
function(data) {
alert(data);
});
Response:
Uncaught SyntaxError: Unexpected token :
Please note that when I click on the error, it takes me to the expected JSON response.
{"json_class":"Fortune","tags":["simpsons_homer"],"quote":"Holy Moly! The bastard's rich!\n\n\t\t-- Homer Simpson\n\t\t Oh Brother, Where Art Thou?","link":"http://iheartquotes.com/fortune/show/5501","source":"simpsons_homer"}
This is also expected as there is no callback function defined in the response.
3 . Through jQuery's Ajax method
$.ajax({
type: "GET",
dataType: "jsonp",
url: "http://www.iheartquotes.com/api/v1/random?format=json",
success: function(data){
alert(data);
},
});
Response:
Uncaught SyntaxError: Unexpected token :
Adding the callback parameter to the above function doesn't change the response.
Any help or pointers from the experts to retrieve the JSON from the URL? I am testing this from the Chrome Dev Tools. I know I could call the service from the server-end code and then send it across to the client-end. But I want to see if this can be done through jQuery alone from the client-end.
EDIT:
Based on Kevin B's comment:
Got the expected output via YQL using jQuery's Ajax. But my question remains the same. Is there a native way to do it via jQuery as YQL is still a dependency?
// Using YQL and JSONP
$.ajax({
url: "http://query.yahooapis.com/v1/public/yql",
// the name of the callback parameter, as specified by the YQL service
jsonp: "callback",
// tell jQuery we're expecting JSONP
dataType: "jsonp",
// tell YQL what we want and that we want JSON
data: {
q: "select * from json where url=\"http://www.iheartquotes.com/api/v1/random?format=json\"",
format: "json"
},
// work with the response
success: function( response ) {
console.log( response.query.results.json ); // server response
}
});
This gives the expected response.
This won't work in all browsers, but depending on which version of JQuery you're using try:
$.support.cors = true;
Obviously this also depends on the headers of the server response.
I was trying to get some information from another server using ajax post call as .
$.ajax({
type: 'POST',
url: testURL,
data: data,
//dataType: 'jsonp',
dataType: "script",
success: function (data) {
alert("Successfully posted (Test) : " + data);
},
error: function (ts) {
alert("Inside Error : " + ts.responseText);
}
});
Here testURL is the URL where i am posting the data (Cross domain requests are only possible if datatype is either jsonp or script), and it suppose to return text/html data back (what fiddler says will be the return type for the data).
I am not sure if i can use any proxy as pages are normal HTML pages.
Isn't there any way to get the [data] as text (as for now success expecting JASONP data and alert("Successfully posted (Test) : " + data); only showing data as undefined). I can't make any changes to API or whatever it is on the remote Server.
Thanks for the help in advance.
Regards
Without a proxy you cannot do it. If that is in a windows box, you can create a COM object to make the call to that server and from your JavaScript you call that COM.
UPDATE:
Well it seems you can with JSONP
jsonp with jquery
I'v been struggling with POST on the Picasa API.
Here's code:
$.ajax({
type: "POST",
url: 'https://picasaweb.google.com/data/feed/api/user/' + uid + '/albumid/' + album_id + '/photoid/' + photo_id,
crossDomain: true,
data: { content: content },
success: function() { alert("Success"); },
error: function() { alert('Failed!'); }
});
I've already retrieved some information via GET without problems.
Now comes the fun part, when I try to test the service with Google this error occurs:
XMLHttpRequest cannot load
https://picasaweb.google.com/data/feed/api/user/userid/albumid/albumid/photoid/photoid?content=foo%bar.
Origin http://localhost:3000 is not allowed by
Access-Control-Allow-Origin
.
And when I try in Firefox the request header method is changed to OPTIONS and status is 204: no content.
Also, I've tried to change datatype to jsonp but then HTTP method changes to GET and it retrieves information about the picture.
Access-Control-Allow-Origin is coming because your are making a ajax call to a server which is not same as your current domain.
Read more here
jsonp will not help for POST request because you can only make GET request with jsonp.
IMHO you should try to make the POST request from server side instead of client side script.
I had called the GET REST API by following code :
$.getJSON('http://myapisite.com/user/1?callback=?', function(msg){
console.log(msg);
});
But for calling DELETE REST API through jquery
what i had tried is :
$.ajax({
url: 'http://mysite.com/user/1?callback=?',
type: 'DELETE',
dataType: 'json',
data: '',
success: function(response) { console.log('PUT completed'+response); }
});.
and this api is not being called , I want to know how should i call the DELETE REST API .
Thanks
You are trying to do a cross-domain request. This means that you cannot use XMLHttpRequest (the basis of AJAX) because of the same-origin policy. You are using a workaround called JSONP, which works by inserting <script> tags into your document.
Script tags will always fetch content via GET, so you can't do a DELETE, POST, PUT or suchlike with them.
The best workaround would be to have a script on your own server that proxies the DELETE request for you.
The FCC recently made available a small set of API calls to access FCC data. In particular, I'm interested in the Consumer Broadband Test API. I'm trying to access this API through jQuery but am failing. Please let me know if I'm doing something wrong with my code or if this seems to be a problem with FCC's API.
If you visit this API request in a browser, it returns a XML response just fine: http://data.fcc.gov/api/speedtest/find?latitude=30.240236062827297&longitude=-97.64787337499999
So I've tried to load this data in jQuery using various methods:
var url = "http://data.fcc.gov/api/speedtest/find?latitude=30.240236062827297&longitude=-97.64787337499999";
$.ajax({
type: "GET",
url: url,
success: function(data) {
console.log("ajax: " + data);
}
});
$.getJSON(url, function(data) {
console.log("getJSON: " + data);
});
$.get(url, function(data) {
console.log("get: " + data);
});
In the Firebug console, all three requests show a 200 (OK) status, but the response body is empty. Also, the resulting console.log messages are:
ajax:
getJSON: null
get:
Am I doing something wrong here?
To work around the Same Origin Policy, you'll need to use JSONP. It is supported by the API. Add callback=? to the URL string in your .getJSON() call:
If the URL includes the string
"callback=?" in the URL, the request
is treated as JSONP instead. See the
discussion of the jsonp data type in
$.ajax() for more details.
So, something like this:
var url = "http://data.fcc.gov/api/speedtest/find?...&callback=?";
$.getJSON(url, function(data) {
// do stuff
});
References: http://api.jquery.com/jQuery.getJSON/
You can't make cross-domain calls using AJAX. It doesn't work like that.
What you probably want to do is to have your AJAX query URL be a local script on your own server, then have that script run a request for the API url (using cURL or something).