如何使用TypeScript将可选参数传递给Angular 2中的@Directives？

Question

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

Answer 1

在您的组件中，将gridGroup属性初始化为一个值，这样，如果未在父组件中声明该属性，则它仍然具有一个值/不会导致错误。

Answer 2

You can do something like this

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