programmatically decide which style attribute to modify in javascript

Question

I have a situation where, depending on a variable value, I will want to modify EITHER the margin-top OR margin-bottom property of a div.

Apart from using an "if else", is there any way of doing it kinda like this :

var whichmargin="marginTop";
document.getElementById('myElement').style.whichmargin = '100px';

If you get what I mean lol ?

By the way, I am using vanilla JS rather than jQuery.

I don't want to use SetAttribute as I don't want to alter any other of the div style.

Any ideas much appreciated:

Nothing wrong with an if-else, just a bit less code this way :) — Chris Jones
– Chris Jones, Commented Mar 19, 2014 at 16:06

progysm · Accepted Answer · 2014-03-19 15:50:34Z

4

using the [] syntax:

var value = 'somethingelse';
var whichmargin = value === 'something' ? "marginTop" : "marginBottom";
document.getElementById('myElement').style[whichmargin] = '100px';

answered Mar 19, 2014 at 15:50

progysm

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1 Comment

Chris Jones Over a year ago

Yesss!!! Thank you so much - I KNEW I had done it before but couldn't remember :) MUCH Appreciated.

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