How can I pass an array as Input() from the component template?

Question

I need to pass an array of values to a component using binding, e.g.

@Component({     selector: 'my-component',     template: '<div data="[1, 2, 'test']"></div> }) export class MyComponent {     @Input() data: any[];     ... } 

However, it seems Angular treats this as string/string[1] (in the actual project the array is a route and I need to pass this route on to a component which has the [routerLink] directive).

How do I go about this?

Answer 1

You need to wrap the property with [] otherwise it is not processed by Angular at all:

[data]="[1, 2, 'test']" 

Your example seems to set data from inside the component. This is not how binding works. What you can do with your component is <my-component [data]="[1, 2, 'test']"></my-component> to pass data from the outside to your component.

Answer 2

So lets's start from here... in Angular 2+ all input will pass down a string if they don't get brackets around...

So there are 2 ways to pass down your values...

if you write it like this: '<div data="[1, 2, 'test']"'

you basically get it as "[1, 2, 'test']" (as string)...

The way you doing is a good way for passing down strings, and you can also use interpolation and mix it with javascript before passing it down like 'Angular {{version}}'

So to pass it down as an Array or any javascript none-sting value, you need to use [] around your input like this...

<div [data]="[1, 2, 'test']"></div>