How can I use an AngularJS filter to format a number to have leading zeros?

Question

I checked the documentation. What I would like is for my numbers to have four digits and leading zeros.

22 to 0022
1  to 0001

Can someone

Answer 1

You could just use pure JavaScript such as

('00000'+refCounter).substr(-5,5)

for padding with 5 zeros the value of refCounter.

NOTE: Make sure to check that refCounter is not undefined, otherwise you'll get an exception.