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From Filip Maj <>
Subject Re: Hack to compass.js to support iOS watchHeadingFilter
Date Tue, 03 Apr 2012 21:01:03 GMT

I didn't go with the array approach just to fuck with you guys, I did it
to save overall work (I.e. Changing iOS vs. changing Android + BB). IF we
did get to a consensus on exec function signature (in the summer? Before
we went to apache? Before cordova-js work began?) then I missed it and I

Bottom line: switching between the two is not a big deal. I will volunteer
to find/replace the ~100 lines of code per platform, no problem.

On 4/3/12 1:53 PM, "Jesse" <> wrote:

>There is no parameter array in WP7, which is making things super painful!
>All exec calls in WP7 use named json objects.
>exec(success,error, "File", "truncate", {fileName:this.fileName,
>This IS the way all the platform SHOULD behave and was discussed ages ago,
>like last summer.
>On Tue, Apr 3, 2012 at 1:48 PM, Filip Maj <> wrote:
>> Hey Becky,
>> I fixed up the tests from your fork and pushed to my fork:
>> Basically, from a black box perspective, if you pass no object (i.e.
>> undefined) into the compass methods as options, then you can expect
>> to call into native with undefined.
>> I'm not sure if it's "purer" but, to make it consistent with use of
>> across all of our APIs, we would not use an options object to pass
>> parameters into native but split the parameters out as individual
>> variables in the parameter array going into exec.
>> The above not necessary for this revision of compass API, though, as iOS
>> is the only one grabbing any parameters anyways. For 1.7 I can help
>> refactor the iOS implementation to clean this up.
>> That being said, I would like to refactor/change the parameter-passing
>> convention in exec(), and I think passing a single object with named
>> parameters is nicer and clearer than an array of values. But that is for
>> another release :)
>> On 4/3/12 1:25 PM, "Becky Gibson" <> wrote:
>> >As discussed on this list,  I added back support for the iOS watch
>> >heading by filter method by "extending" the unified JS
>> >and getCurrentHeading() methods.   Frankly, I think this is a bit of a
>> >hack
>> >but it works.  If the call to watchHeading contains an options.filter
>> >parameter and it is > 0, I call getCurrentHeading with that options
>> >and do not set up a interval to repeatedly call getCurrentHeading.  I
>> >a "special" value into the timers array so that when a clearWatch is
>> >called, I know to call Compass.stopHeading rather than just clearing
>> >interval.
>> >
>> >The issue is that sometimes getCurrentHeading is called with an options
>> >object and other times options is undefined.  I don't see any issues on
>> >iOS
>> >calling exec with the undefined options param.  Need someone to verify
>> >this
>> >on Android.  Also, this breaks the unit tests, and not being familiar
>> >Jasmine, wasn't sure how to deal with an "optional" parameter?   So,
>> >use some advice on how to handle that.  I could also make it a bit more
>> >"pure" and only pass the options parameter when it is legitimate or
>> >null with it was not passed in.  Looking for suggestions as to how
>>best to
>> >fix this and modify the tests to pass before I check in.
>> >
>> >
>> >
>> >thanks,
>> >-becky

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