Access nested objects in js

Question

I have a object like

var obj = {
  floorPlan: 'hello',
  dateSpan: {
    from: Sat Feb 21 2015 00: 00: 00 GMT + 0530(IST),
    to: Wed Feb 25 2015 00: 00: 00 GMT + 0530(IST)
  }
};

and a string

var a = 'dateSpan.to';

I want to access 'obj.dateSpan.to' using the variable 'a'. How can I do it? please help.

suppose to access obj.floorPlan i can use obj['floorPlan']. Similarly i want to access obj.dateSpan.to — monojit biswas
– monojit biswas, Commented Jan 16, 2015 at 6:56

dfsq · Accepted Answer · 2015-01-16 07:13:43Z

1

You will need to split the string by . character and loop through the object until you reach the last part of the split string:

function getValue(str) {
    var val = obj,
        parts = str.split('.');
    while (val[parts[0]]) {
        val = val[parts.shift()]
    }
    return parts.length == 0 ? val : null;
}


var obj = {
    floorPlan: 'hello',
    dateSpan: {
        from: "Sat Feb 21 2015 00: 00: 00 GMT + 0530(IST)",
        to: "Wed Feb 25 2015 00: 00: 00 GMT + 0530(IST)"
    }
};

var a = 'dateSpan.to';

alert(getValue(a));

edited Jan 16, 2015 at 7:13

answered Jan 16, 2015 at 7:05

dfsq

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