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: \'


        
                      

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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

Normally you only use input when the component is nested within another component.

So in another component, something like: <my-component [data]= ...>

Answer 3

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>