Using a Select Value as a Json Var in Sort

Question

I am trying to use the value from a select dropdown list as a variable for a Json filtering function. When I hardcode the value of a.(name), it works, but when I try to use the keyname var from the dropdown list it returns undefined.

function sortJson(a, b)
{
    //get sorting dropdown value for key
    var keyname = $('#sortByKey').val();// I want to dynamically set the keyname from dropdown. It traces correctly, so I am getting the value I want.

    if (a.keyname == b.keyname)//works when i hardcode a.name, or a.id etc...
    {
        return 0;
    }
    return a.keyname > b.keyname ? 1 : -1;
};

Xavier Delamotte · Accepted Answer · 2013-03-04 16:04:39Z

1

you juste have to write:

a[keyname]

instead of

a.keyname

answered Mar 4, 2013 at 16:04

Xavier Delamotte

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Ben McCormick · Accepted Answer · 2013-03-04 16:06:20Z

1

To reference the properties of the variable with the name specified by keyName, use the brackets syntax as another answer suggested:

a[keyname]

This is equivalent to a.key if keyname is key, but will allow you to use a dynamic string.

a.keyname tries to lookup the keyname property on a, which does not exist.

answered Mar 4, 2013 at 16:06

Ben McCormick

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2 Comments

User970008 Over a year ago

Thanks, I appreciate it. I don't know what I was thinking.

Ben McCormick Over a year ago

No problem. A bit of stack overflow advice, generally if you want to thank someone here, upvote their answer/question. Thanks in the comments/question are generally frowned upon since they add noise: meta.stackexchange.com/questions/17878/…

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