Reading Dynamic JSON Array

Question

I trying to build a JavaScript function which will grab a JSON encoded array and return a value based on the requested key. I use the jQuery $.parseJSON() method to take the JSON string and convert it into a JavaScript object. Here a watered down example:

function getValue(dynamicArrayKey) {
  var theArray = $.parseJSON(/* Get some JSON from a source using jQuery */);

  alert('Here is the value: ' + theArray.dynamicArrayKey);
}

So the key I want will be given to the function, and it should return the resulting value. I am thinking that the JavaScript eval() method should be used in there somewhere, but I'm not sure. Any help would be greatly appreciated.

Dr.Molle · Accepted Answer · 2011-04-11 22:48:15Z

4

There's no need to eval(), use

alert('Here is the value: ' + theArray[dynamicArrayKey]);

answered Apr 11, 2011 at 22:48

Dr.Molle

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2 Comments

Oliver Spryn Over a year ago

Awesome! Works like a charm! I was wondering, though, why can I do something like this: "theArray.notDynamicArrayKay", when I'm actually looking for a key by that name, but I have to use the "theArray[dynamicArrayKey]" when the value I'm looking for a value that is dynamic? Just curious.

Dr.Molle Over a year ago

It's called subscript notation. You may take a look at crockford.com/misty/objects.html :)

Community · Accepted Answer · 2017-05-23 10:33:13Z

0

Take a look at this. It may help.

How to search JSON tree with jQuery

edited May 23, 2017 at 10:33

CommunityBot

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answered Apr 11, 2011 at 22:49

Diodeus - James MacFarlane

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1 Comment

Oliver Spryn Over a year ago

Thanks for the pointer, but I'm afraid that would involve too much redundant processing for a simple task, especially since this function will be called rather frequently.

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