Define the object literal key from a string variable value

Question

instead of:

 sourceFormControl.setErrors({ "scoresGreaterThan": true });

I need it dynamic:

 let errorKey = "scoresGreaterThan";
 sourceFormControl.setErrors({ errorKey: true });

but that did not work :-/

I want the content of the errorKey to be the key of the object literal passed to the setErrors method.

How can I do that with TypeScript?

`sourceFormControl.setErrors({ [ errorKey ] : true });` – ibrahim mahrir Apr 28 '17 at 21:07 — ibrahim mahrir, Apr 28 '17 at 21:07

score 2 · Accepted Answer · answered Apr 28 '17 at 21:07

2

Drop the key inside square brackets.

sourceFormControl.setErrors({ [errorKey]: true });

answered Apr 28 '17 at 21:07

kind user

1

just found it too: http://stackoverflow.com/questions/19837916/creating-object-with-dynamic-keys and it worked, thx! – Pascal Apr 28 '17 at 21:08

score 0 · Answer 2 · answered Apr 28 '17 at 21:10

0

One way is to create an object and then assign a value to that key.

 let errorKey = "scoresGreaterThan";
 let obj = {};
 obj[errorKey] = true;
 sourceFormControl.setErrors(obj);

answered Apr 28 '17 at 21:10

Zohaib Ijaz

2 Answers2