[openspending-dev] Toggle between multiple years?

[Adam Stiles]

Thanks! Sure, you can use the photo however you want. Credit: Sonya Rifkin



On Thu, May 2, 2013 at 3:53 PM, Tryggvi Björgvinsson <
tryggvi.bjorgvinsson at okfn.org> wrote:

> Hi Adam,
>
> On fim 2.maí 2013 21:35, Adam Stiles wrote:
> > Hello,
> >
> > I am trying to add links to toggle between different years similar to
> what
> > is here: http://bund.offenerhaushalt.de/
> >
> > Can someone outline the code and files that need to be changed?
> > https://github.com/adstiles/openbudgetoakland/
>
> This should be relatively easy to add. You need some minor changes to
> javascripts/main.js
>
> In that file you're making the cut to find the years in this variable:
>
>     var cuts = {"time.year": "2011|time.year:2012"};
>
> The pipe between them chooses both years (it means 'or').
> http://bund.offenerhaushalt.de uses a url parameter (the thing after the
> question mark in the url) called "reference_year" to find the relevant
> year. You could do that easily since that's already being done to work
> with the drilldown - the stuff using purl fetches the url parameters in
> this line:
>
>     var parameters = $.url().param();
>
> After this line you can get a known parameter, let's say
> 'reference_year' with something like:
>
>     parameters['reference_year']
>
> The cuts variable could then be defined after getting the parameters
> with something like:
>
>     var cuts = {"time.year": parameters['reference_year']};
>
> Note that this assumes reference_year will always be present (which is
> not always the case. For those cases I usually use something called
> 'ternary operator'.
>
> Ternary operator works by checking for something and then returning
> something based on the outcome (woah, that's not a good explanation).
> It's structured with a question mark and a colon:
>
> <the check> ? <if check return this> : <if not check return this>
>
> So, you can use it to check if parameters has reference_year and putting
> that into a variable called year. If parameters doesn't have it the
> ternary operator should return a default variable, there are some good
> ways to do that but here's how you would do it by hard coding it to '2012':
>
> var year = parameters['reference_year'] ? parameters[reference_year] :
> '2012';
>
> Then you can use this 'year' variable instead of
> parameters['reference_year'] when you define the cuts.
>
> So if you put this all together you'll have what you're looking for :-)
>
> I hope it helps. Don't be afraid to ask for help. You can also ask
> around on IRC. I try to follow what's happening on #openspending on
> freenode but I might not see it immediately -- sometimes I'm working
> instead of hanging out on IRC ;-)
>
> > BTW, image attached of a treemap in action ...
>
> This is awesome! Thanks! I'm really proud of you guys/girls and I'm
> saving this image for later :-) Would you be willing to allow me to use
> it under a Creative Commons license (e.g. cc-by or cc-by-sa) and if so
> who should I attribute it to?
>
> /Tryggvi
>
>
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-- 
Adam Stiles
510.280.4862
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