How do I access an object property dynamically using a variable in JavaScript?

Question

I’m trying to filter data from JSON in JavaScript.

I define a variable a. I want the property of whatever value a is equal to (not item.a). So far I’ve been unable to find a way of doing it.

Everything else is working correctly because when I changed it to a specific entry (item.date for example) it works fine. I cannot figure out the correct syntax.

while(i< elements.length){
    var a=elements[i].id;
    if(elements[i].name == 'targetfeild'){
      $(elements[i]).val($.map(result,function(item){var test = elements[i].id;return item.a;}));
    }
    i++;
}

exact duplicate of [JavaScript object: access variable property by name as string](http://stackoverflow.com/questions/4255472/javascript-object-access-variable-property-by-name-as-string) — Bergi, Aug 06 '13 at 14:02

score 2 · Accepted Answer · edited Aug 06 '13 at 13:28

2

Try item[a], javascript objects can also be accessed this way.

edited Aug 06 '13 at 13:28

iConnor

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answered Aug 06 '13 at 13:27

MaxPRafferty

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Yep that did it, I knew it would be something blindly obvious, now I feel bad for asking. Thanks for your help! – Spag-bol Aug 06 '13 at 13:30
@Spag-bol , No worries, in your defense JS's pseudo-associative-array pattern is fairly non obvious. If this answered your question please mark it answered using the checkmark to the left. – MaxPRafferty Aug 06 '13 at 13:40

How do I access an object property dynamically using a variable in JavaScript?

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