Angular 2—change component selector

问题

The Angular 2 docs say to define a component like this, using a magic string for the selector name:

import { Component } from '@angular/core';
@Component({
  selector: 'card',
  template: `
    <div class="card">{{title}}</card>
    `
})
export class Card {
  title = 'Card Title';
}

If I do this, am I stuck with <card> as the only way to use this component in the future? Can an app have only one type of component with this selector? For example, is it possible to use a <card> from a third-party library, and also use my own <card>?

This is trivial in React, because component names are just variables.

import OtherCard from 'card'
const Card = title => <div className="card">{title}</div>
const Composable = title => <OtherCard><Card title={title} /></OtherCard>

One of the reasons I ask is so I can know whether to namespace Angular 2 component selectors like in Angular 1 and Objective-C:

selector: 'initech-card'

回答1:

You should namespace Angular2 component selectors (but not with ng- ;-) )

I think you can't import 2 modules that contain elements with the same selector (not tried).

This limits you to one component with a specific selector within one module. If you encounter a collision you might be able to split your code in 2 modules where one module imports <card> from ModuleA and the other module imports <card> from ModuleB.

I wouldn't expect such collisions to happen a lot.

EDIT (updating answer from comments)

Components are module-scoped, which gives you the ability to use components with third-party components with the same selector, like in the Composable React component in the example in the question.

To use a <card> you wrote with a third-party <card>, you can wrap the third-party component with another component that is part of an imported module and then use the wrapper component instead.

update

For changing the selector of the root component see also

https://github.com/angular/angular/pull/14750
https://github.com/angular/angular/issues/7136
https://github.com/angular/angular/issues/13035

来源：https://stackoverflow.com/questions/39533051/angular-2-change-component-selector

标签

angular

components