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$.ajax context option

I've got some code that looks like this:

$.post(self.baseUrl + 'api/method', {param1: data}, function (response) { // Do something });

I want to pass a reference to the self object through to the callback, which I imagined would be something like this:

$.post(self.baseUrl + 'api/method', {param1: data}, function (response, self) { // Do something });

However, it doesn't work like this, the jQuery documentation doesn't show a way that would make this possible and a cursory Google search hasn't turned up anything. Is this possible, and how can I do so?

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  • what do you wanto to do with that object? Commented Sep 20, 2012 at 11:23
  • @jhonraymos Call the method that contains this code recursively Commented Sep 20, 2012 at 11:30
  • @AndreasNiedermair I've voted against closing this one - it's asking a very similar thing, but the question has come from a different direction. This question needs an answer that explains that there is a context option, while the proposed duplicate is asking how to use that context. Commented Sep 21, 2012 at 7:34

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If you use the $.ajax method you can specify a context:

$.ajax({ type: "post", context: self, data: {param1: data}, success: function (response) { console.log(this); // now 'this' refers to self } });
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Thanks. that's exactly what I was after.
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@karim79 shows the best solution. I just want to show some other possible ways

var App = { baseUrl: "http://.../", fetchData: function() { var self = this; $.post(self.baseUrl + 'api/method', { param1: data }, function(data) { self.onDatafetch(data); //or globalDataFetch(data, self); }); }, onDatafetch: function(data) { this.showMsg(); }, showMsg: function() { alert("Success"); } } App.fetchData(); function globalDataFetch(data, object){ // received data and object }
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why do you want to do sth like that?

you could easily use a closure:

var param1 = data; $.post(self.baseUrl + 'api/method', function (data) { // access param1 here });
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This is inside a method of the object represented by the self variable, and inside the callback I actually call this method recursively, so I need to pass a reference through.
actually you do not need a reference if you are after calling recursively. just remember the paradigm: each variable of a scope is available from every line (in that scope), no matter where it gets declared - this is because the compiler moves the declaration to the top (but not the assignment, which might be done later) - see this example jsfiddle.net/dittodhole/x359K
btw... recursion can be, not in every case, replaced by a stack - so that might be the better option to implement ...
nevertheless: you do not need a context - this can be done with closures! just introduce a new variable (and see my fiddle for further hints) ...

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