Patch: JSONP: Support callbackName to request content with a constant URL

[ion]

Say, your page requests ​http://ws.audioscrobbler.com/2.0/?method=user.getweeklyartistchart&user=...&format=json&callback=foo using JSONP. The response doesn’t change often and it isn’t urgent to get the most recent possible version.

Currently the callback name will be different for each request. If there were a way to keep the callback name constant for that specific request, both the browser and the server could cache the content.

The attached patch implements the callbackName parameter for $.ajax, so that

$.ajax ({
  url:          'http://ws.audioscrobbler.com/...&callback=?',
  success:      ...,
  dataType:     'json',
  callbackName: 'AudioScrobblerChart'
});

requests ​http://ws.audioscrobbler.com/...&callback=jsonpAudioScrobblerChart.

The patch throws an error if the programmer uses the same callbackName twice simultaneously.

[john]

It doesn't really seem like this is needed. If you're really worried about static naming you could just do:

$.ajax ({
  url:          'http://ws.audioscrobbler.com/...&callback=AudioScrobblerChart',
  dataType:     'script'
});

function AudioScrobblerChart(json){
   // do stuff with the JSON
}

...which isn't really a huge stretch.

[tudor_s]

I also came about making the same patch as posted here. It would really benefit caching by having this option. Especially when you want your other jQuery plugins to use the same settings without the need to change the way they request data.

Therefore this change would really be appreciated, especially when it comes with a small cost to implementing it.

Thank you.

[john]

Fixed. ​http://github.com/jquery/jquery/commit/fbc73d45b487dd863886c7fd3f0af1fd4dec261b