Obtain the response headers once the backbone fetch operation has finished

Is there a method to read response headers in an Ajax request using the fetch method in backbone.js? Can headers be accessed if the fetch method is overridden?

var PageCollection = Backbone.Collection.extend({

    url: 'http://localhost/cms?_mn=Mod_Admin&_mf=getAllPages',

    model: PageModel,

    fetch: function (options) {
        Backbone.Collection.prototype.fetch.call(this, options);
        // The code above successfully fetches the dataset 
        // However, how can I access and read the response headers at this point?
    }
});

Answer №1

To access all the response headers, make use of the "success" callback to retrieve the xhr object:

collection.fetch({
    success: function (collection, response, options) {
        options.xhr.getAllResponseHeaders(); // Retrieve all headers
        options.xhr.getResponseHeader('header_name'); // Retrieve a specific header
    }
});

Answer №2

The Fetch method in Backbone.js retrieves data from a server and returns a jqXHR object, which can be used to handle the response. By calling the done() function on this object, you can set up a callback that will execute once the request is complete. To access specific HTTP headers in the response, you can use methods like getResponseHeader() or getAllResponseHeaders().

When implementing a custom fetch method in your code, the process could look something like the example below:

var jqXHR = Backbone.Collection.prototype.fetch.call(this, options);
jqXHR.done(function() {
    // Retrieve all headers:
    console.log('All headers:', jqXHR.getAllResponseHeaders());
    // Alternatively, retrieve a specific header:
    console.log('Content-Length:', jqXHR.getResponseHeader('Content-Length'));
});

Answer №3

Check out how I utilized the parse function in my implementation

var CustomPageCollection = Backbone.Collection.extend({
    model: CustomPage,
    url: '/pb/editor/pages',
    parse: function(resp, xhr) {
        this.paginationInfo = JSON.parse(xhr.getResponseHeader('X-Pagination-Info'));
        return resp.items;
    }
});

Answer №4

After some experimentation, I discovered a more elegant solution: the collection triggers a "parse" function upon returning from the server BackboneJs - collection Parse

parse:function(x,y,z){      
    console.log("x",x);
    console.log("y",y);
    console.log("z",z);
},

our friend can be found at y :)

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