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docs: Bind console functions in JS examples

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For e.g. ``console.log`` to be used as a callback, it must be bound to the
``console`` object first: ``console.log.bind(console)``. If not, this will
cause "Illegal invocation" errors in WebKit browsers.

This change updates all our Mopidy.js examples to bind ``console`` functions
before they are used as callbacks.

Fixes #298.
This commit is contained in:
Stein Magnus Jodal 2013-01-03 23:13:06 +01:00
parent 91297c1ba8
commit cbb68f9cbe
1 changed files with 23 additions and 18 deletions
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41
mopidy/frontends/http/__init__.py
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@ -198,7 +198,7 @@ them:
.. code-block:: js
mopidy.on(console.log);
mopidy.on(console.log.bind(console));
Several types of events are emitted:
@ -289,7 +289,8 @@ Instead, typical usage will look like this:
}
};
mopidy.playback.getCurrentTrack().then(printCurrentTrack, console.error);
mopidy.playback.getCurrentTrack().then(
printCurrentTrack, console.error.bind(console));
The first function passed to ``then()``, ``printCurrentTrack``, is the callback
that will be called if the method call succeeds. The second function,
@ -303,7 +304,7 @@ callback:
.. code-block:: js
mopidy.playback.next().then(null, console.error);
mopidy.playback.next().then(null, console.error.bind(console));
The promise objects returned by Mopidy.js adheres to the `CommonJS Promises/A
<http://wiki.commonjs.org/wiki/Promises/A>`_ standard. We use the
@ -368,6 +369,8 @@ Example to get started with
.. code-block:: js
var consoleError = console.error.bind(error);
var trackDesc = function (track) {
return track.name + " by " + track.artists[0].name +
" from " + track.album.name;
@ -381,14 +384,14 @@ Example to get started with
mopidy.playback.play(tlTracks[0]).then(function () {
mopidy.playback.getCurrentTrack().then(function (track) {
console.log("Now playing:", trackDesc(track));
}, console.error);
}, console.error);
}, console.error);
}, console.error);
}, consoleError);
}, consoleError);
}, consoleError);
}, consoleError);
};
var mopidy = new Mopidy(); // Connect to server
mopidy.on(console.log); // Log all events
var mopidy = new Mopidy(); // Connect to server
mopidy.on(console.log.bind(console)); // Log all events
mopidy.on("state:online", queueAndPlayFirstPlaylist);
Approximately the same behavior in a more functional style, using chaining
@ -396,6 +399,8 @@ Example to get started with
.. code-block:: js
var consoleError = console.error.bind(error);
var getFirst = function (list) {
return list[0];
};
@ -429,23 +434,23 @@ Example to get started with
var queueAndPlayFirstPlaylist = function () {
mopidy.playlists.getPlaylists()
// => list of Playlists
.then(getFirst, console.error)
.then(getFirst, consoleError)
// => Playlist
.then(printTypeAndName, console.error)
.then(printTypeAndName, consoleError)
// => Playlist
.then(extractTracks, console.error)
.then(extractTracks, consoleError)
// => list of Tracks
.then(mopidy.tracklist.add, console.error)
.then(mopidy.tracklist.add, consoleError)
// => list of TlTracks
.then(getFirst, console.error)
.then(getFirst, consoleError)
// => TlTrack
.then(mopidy.playback.play, console.error)
.then(mopidy.playback.play, consoleError)
// => null
.then(printNowPlaying, console.error);
.then(printNowPlaying, consoleError);
};
var mopidy = new Mopidy(); // Connect to server
mopidy.on(console.log); // Log all events
var mopidy = new Mopidy(); // Connect to server
mopidy.on(console.log.bind(console)); // Log all events
mopidy.on("state:online", queueAndPlayFirstPlaylist);
9. The web page should now queue and play your first playlist every time your