Question

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How do I add a property to a Javascript Object using a variable as the name?
Dynamic property names for loop of object Javascript

In success of javascript function I receveing data and it look like this:

data.lvl1
data.lvl2
data.lvl3
...

let say I have only 3 elements in data and I would like to loop for each of them and rise alert for every level:

for(a = 1; a<= 3; a++)
{
   alert(data.lvl + a);
   //I would like to read lvl1, lvl2, lvl3
}

This approach is obviously wrong.
Please explain how to reach lvl1, lvl2 in loop when lvl number is based on increasing a.

Answer 1

If you want to access a property name using a string, then use square bracket notation.

foo.bar === foo['bar']

Such:

alert(data['lvl' + a]);

But it would be better to restructure your data so that you had something like:

data = { lvl: [1,2,3] }

instead of

data = { lvl1: 1, lvl2: 2, lvl3: 3 }