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Output javascript lookup tables on the fly
This is probably so simple, but the details are killing me. I’m iterating over a result set (from a shop database) and want to build a javascript lookup table from the information. Ideally I’d like to use jQuery’s .data() method, but it seems that’s only one-shot, i.e. each time round the loop if I use another .data() call it’ll overwrite the previous item if it has the same key. I want to append the values so that I end up taking this kind of input structure:
size=40, colour=red, stock=32
size=40, colour=green, stock=12
size=42, colour=red, stock=1
size=40, colour=blue, stock=0
size=44, colour=green, stock=5
...and turning it into something javascripty like this as I iterate over each of the above rows:
size_matrix['40']['red'] = 32;
size_matrix['40']['green'] = 12;
size_matrix['42']['red'] = 1;
size_matrix['40']['blue'] = 0;
size_matrix['44']['green'] = 5and
colour_matrix['red']['40'] = 32;
colour_matrix['green']['40'] = 12;
colour_matrix['red']['42'] = 1;
colour_matrix['blue']['40'] = 0;
colour_matrix['green']['44'] = 5(or equivalent JSON / jQuery.data() structure)
Essentially I want to store it in a suitable format such that when someone chooses ‘40’ from a select list I can use jQuery to look up the stock quantities available in each colour from size_matrix, and vice versa: when they choose ‘red’ from the other select list I can look up the stock quantities available in each size from colour_matrix and display them.
At the moment, no matter what I try I keep getting javascript errors like size_matrix[40] is undefined or it just borks. I wonder if it’s because the first index is numeric and JS is assuming I should be numbering them starting from 0 instead of jumping in at slot 41 (or something like that).
I’m sure the solution is simple and I just need a nudge in the right direction on how to output the relevant data structures on the fly as I read each source row. Ultimately I don’t care what format the js info is stored in as long as I can ask the data structure for one size to return a list of colours+stock quantities, and look up one colour to get a list of sizes+stock quantities.
Many thanks in advance for any pointers.
Last edited by Bloke (2011-08-24 08:59:06)
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Re: Output javascript lookup tables on the fly
So technically variables can’t start with numbers so it could be problematic. You could always prepend a $ or _ to the number and use that when looking up. So it would become size_matrix["$40"] or size_matrix["_40"]
That being said this does seem to work if you look it up using size_matrix["40"] (notice the quotes)
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