javascript data attribute read by name when name is dynamically generated [duplicate]

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.

If you only have those properties, you better use a for...in loop though (if the order does not matter): developer.mozilla.org/en-US/docs/JavaScript/Reference/…. See als How do I enumerate the properties of a javascript object?. — Felix Kling
– Felix Kling, Commented Oct 22, 2012 at 10:24

Quentin · Accepted Answer · 2012-10-22 10:20:32Z

2

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 }

answered Oct 22, 2012 at 10:20

Quentin

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3 Comments

dllhell Over a year ago

Thank you kind sir, feeling a little ashamed :)

Alnitak Over a year ago

so should Quentin, for not bothering to find one of the dozens of other identical questions ;-)

dllhell Over a year ago

yeah, it must be redundant question but I didn't know how to express my question in short way so I didn't find any helpfull answers. Sorry for that

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