Ng-if to judge multiple numbers

Question

I have lots of questionnaire, and now I want to use *ngIf to filter which not to appear in some div.

the stupid way now I use is to sign individually

<div *ngIf = "questionNo!= '00' && questionNo!= '04' && questionNo != '21'">
...</div>

and I think there is better way like *ngIf= "questionNo != [00.01,02....]" but I try but in vain.

so I need your help~ thank you!

Answer 1

I would move that condition to component code into shouldShowSomething():bool as it is much clearer and maintainable + can take arguments for eventual parametrization.

Answer 2

Either use && or || or:

*ngIf= "[00,01,02].includes(questionNo)"

*ngIf= "![00,01,02].includes(questionNo)"