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 — Bergi
– Bergi, Commented Aug 6, 2013 at 14:02

iConnor · Accepted Answer · 2013-08-06 13:28:41Z

2

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

edited Aug 6, 2013 at 13:28

iConnor

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answered Aug 6, 2013 at 13:27

MaxPRafferty

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2 Comments

Spag-bol Over a year ago

Yep that did it, I knew it would be something blindly obvious, now I feel bad for asking. Thanks for your help!

MaxPRafferty Over a year ago

@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.

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