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This is how you insert params into a directive.

<p [gridGroup]="gridGroup"></p>

But what I am wanting to do is make the param optional so that I won't have to always include it within my class.

I am required to insert gridGroup in each class that references this html source.

I have tried

<p [gridGroup?]="gridGroup"></p>

and 

<p [gridGroup]="gridGroup?"></p>

Both give me compile errors

lealceldeiro
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Demodave
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2 Answers2

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In your component intialize the gridGroup property to a value, that way if the property is not declared in the parent component it still has a value/won't cause errors.

SimplyComplexable
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You can do something like this

@Input set gridGroup(value: any) {
      this._gridGroup= value;
      doSomething(value);
    }
Mantu Nigam
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