attr.disabled null or empty string is returning true

Question

I am trying to set an inputs disabled attribute to true if a property has a value, however what I am using now seems to be returning true if the property is null or an empty string.

[attr.disabled]="userForm.value.email? true: false"

I think this is a dup of https://stackoverflow.com/questions/36745734/how-to-add-conditional-attribute-in-angular-2/36745752#36745752 — Günter Zöchbauer, Mar 15 '18 at 17:06

score 1 · Answer 1 · answered Mar 15 '18 at 17:03

1

To get an bound attribute removed, the value needs to be null instead of false

[attr.disabled]="userForm.value.email? true: null"

answered Mar 15 '18 at 17:03

Günter Zöchbauer

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`undefined` should work too, right ? (and actually I thought only undefined worked) – Pac0 Mar 15 '18 at 17:05
I haven't tried `undefined`, but I can imagine that it works as well. – Günter Zöchbauer Mar 15 '18 at 17:05

attr.disabled null or empty string is returning true

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