CODEWITHSUNDEEP
javascriptjsonjqueryjsonp
user3203283
user3203283

Reputation: 81

Jquery jsonp response error - Callback was not called

I'm trying to get some information from a different domain, the domain allows only jsonp call - others get rejected. How can I get the content instead of execution? Because I get an error in response. I don't need to execute it, I just need it in my script. In any format (the response is json but js doesn't understand it). I can't affect on that domain so it's impossible to change something on that side. Here's my code:

$.ajax({
    url: url + '?callback=?',
    crossDomain: true,
    type: "POST",
    data: {key: key},
    contentType: "application/json; charset=utf-8;",
    async: false,
    dataType: 'jsonp',
    jsonp: 'callback',
    jsonpCallback: 'jsonpCallback',
    error: function(xhr, status, error) {
        console.log(status + '; ' + error);
    }
});

window.jsonpCallback = function(response) {
    console.log('callback success');
};

Upvotes: 8

Views: 42193

Answers (3)

Naushad Moidin
Naushad Moidin

Reputation: 280

var url = "https://status.github.com/api/status.json?callback=apiStatus";
$.ajax({
    url: url,
    dataType: 'jsonp',
    jsonpCallback: 'apiStatus',
    success: function (response) {
        console.log('callback success: ', response);
    },
    error: function (xhr, status, error) {
        console.log(status + '; ' + error);
    }
});

Try this code.

Also try calling this url directly in ur browser and see what it exactly returns, by this way You can understand better what actually happens :).

Upvotes: 2

gen_Eric
gen_Eric

Reputation: 227240

There are a few issues with your $.ajax call.

$.ajax({
    url: url + '?callback=?',
    // this is not needed for JSONP.  What this does, is force a local
    // AJAX call to accessed as if it were cross domain
    crossDomain: true,
    // JSONP can only be GET
    type: "POST",
    data: {key: key},
    // contentType is for the request body, it is incorrect here
    contentType: "application/json; charset=utf-8;",
    // This does not work with JSONP, nor should you be using it anyway.
    // It will lock up the browser
    async: false,
    dataType: 'jsonp',
    // This changes the parameter that jQuery will add to the URL
    jsonp: 'callback',
    // This overrides the callback value that jQuery will add to the URL
    // useful to help with caching
    // or if the URL has a hard-coded callback (you need to set jsonp: false)
    jsonpCallback: 'jsonpCallback',
    error: function(xhr, status, error) {
        console.log(status + '; ' + error);
    }
});

You should be calling your url like this:

$.ajax({
    url: url,
    data: {key: key},
    dataType: 'jsonp',
    success: function(response) {
        console.log('callback success');
    },
    error: function(xhr, status, error) {
        console.log(status + '; ' + error);
    }
});

JSONP is not JSON. JSONP is actually just adding a script tag to your <head>. The response needs to be a JavaScript file containing a function call with the JSON data as a parameter.

JSONP is something the server needs to support. If the server doesn't respond correctly, you can't use JSONP.

Please read the docs: http://api.jquery.com/jquery.ajax/

Upvotes: 16

Jacob Budin
Jacob Budin

Reputation: 10003

The jsonpCallback parameter is used for specifying the name of the function in the JSONP response, not the name of the function in your code. You can likely remove this; jQuery will handle this automatically on your behalf.

Instead, you're looking for the success parameter (to retrieve the response data). For example:

$.ajax({
    url: url,
    crossDomain: true,
    type: "POST",
    data: {key: key},
    contentType: "application/json; charset=utf-8;",
    async: false,
    dataType: 'jsonp',
    success: function(data){
        console.log('callback success');
        console.log(data);
    }
    error: function(xhr, status, error) {
        console.log(status + '; ' + error);
    }
});

You can also likely remove the other JSONP-releated parameters, which were set to jQuery defaults. See jQuery.ajax for more information.

Upvotes: 1

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