Question:
I don't really get why this isn't working:
thing = { img78:{ exifmanufacturer:"Canon", exifmodel:"Canon EOS 450D", exifexposuretime:"1/125", exiffstop:"71/10", exifiso:"200"}, img79:{ exifmanufacturer:"Canon", exifmodel:"Canon EOS 550D", exifexposuretime:"1/125", exiffstop:"71/10", exifiso:"100"}, img80:{ exifmanufacturer:"Canon", exifmodel:"Canon EOS 550D", exifexposuretime:"1/30", exiffstop:"16/1", exifiso:"250"}, img81:{ exifmanufacturer:"NIKON CORPORATION", exifmodel:"NIKON D700", exifexposuretime:"10/600", exiffstop:"71/10", exifiso:"800"}, img82:{ exifmanufacturer:"NIKON CORPORATION", exifmodel:"NIKON D700", exifexposuretime:"10/2500", exiffstop:"90/10", exifiso:"800"}, img83:{ exifmanufacturer:"NIKON CORPORATION", exifmodel:"NIKON D700", exifexposuretime:"10/600", exiffstop:"71/10", exifiso:"800"}, img77:{ exifmanufacturer:"Canon", exifmodel:"Canon EOS 450D", exifexposuretime:"1/160", exiffstop:"8/1", exifiso:"100"}, img69:{ exifmanufacturer:"NIKON CORPORATION", exifmodel:"NIKON D700", exifexposuretime:"10/600", exiffstop:"71/10", exifiso:"800"} }; var imageid = 'img80'; console.log('myVar1: ', thing.img80.exifmodel); console.log('myVar2: ', thing.imageid.exifmodel); Outputs:
myVar1: Canon EOS 550D thing.imageid is undefined I would have thought it would be the other way round.
Solution:1
You need to access it slightly differently using [] notation, like this:
console.log('myVar2: ', thing[imageid].exifmodel); In JavaScript these are equivalent:
obj.Property obj["Property"] Or as in your case:
var prop = "Property"; obj[prop];
Solution:2
In the second example, it'd be like writing thing.'img80'.exifmodel which is illegal. If you want to use a string to access a field of an object you'd have to do thing[imageid].exifmodel.
Solution:3
When you have the index in a string like that, you have to use the bracket notation to access the value:
var imageid = 'img80'; console.log('myVar2: ', thing[imageid].exifmodel); Or you could always take the eval (or evil, depending on how bad you consider this practice) route:
eval("console.log('myVar2: '), thing." + imageid + ".exifmodel)"); Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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