将输入传递到Angular 2中的嵌套组件 [英] Pass inputs to nested component in Angular 2

问题描述

如何将属性从包装器组件透明地转换为嵌套组件?

How can the attributes be transparently translated from wrapper component to nested component?

考虑到存在

const FIRST_PARTY_OWN_INPUTS = [...];
const FIRST_PARTY_PASSTHROUGH_INPUTS = ['all', 'attrs', 'are', 'passed'];
@Component({
  selector: 'first-party',
  inputs: [...FIRST_PARTY_OWN_INPUTS, ...FIRST_PARTY_PASSTHROUGH_INPUTS],
  template: `
<div>
  <third-party [all]="all" [attrs]="attrs" [are]="are" [passed]="passed"></third-party>
  <first-party-extra></first-party-extra>
</div>
  `,
  directives: [ThirdParty]
})
export class FirstParty { ... }

输入是否可以批量翻译，所以不会在模板中枚举?

Can the inputs be translated in batch, so they would not be enumerated in template?

上面的代码应该为Angular 1.x指令重新创建配方:

The code above is supposed to recreate the recipe for Angular 1.x directives:

app.directive('firstParty', function (thirdPartyDirective) {
  const OWN_ATTRS = [...];
  const PASSTHROUGH_ATTRS = Object.keys(thirdPartyDirective[0].scope);

  return {
    scope: ...,
    template: `
<div>
  <third-party></third-party>
  <first-party-extra></first-party-extra>
</div>
    `,
    compile: function (element, attrs) {
      const nestedElement = element.find('third-party');

      for (let [normalizedAttr, attr] of Object.entries(attrs.$attr)) {
        if (PASSTHROUGH_ATTRS.includes(normalizedAttr)) {
          nestedElement.attr(attr, normalizedAttr);
        }
      }
    },
    ...
  };
});

推荐答案

我不确定是否正确，但这是我的实现(

I'm not sure if I got it right but here is my implementation ( PLUNKER )

const FIRST_PARTY_OWN_INPUTS = ['not', 'passthrough'];
const FIRST_PARTY_PASSTHROUGH_INPUTS = ['all', 'attrs', 'are', 'passed'];

const generateAttributes(arr) {
   return arr.map(att => '[' + att + '] = "' + att + '"').join(' ');
}


//-------------------------------------------------------//////////////////
import {Component} from '@angular/core'

@Component({
  selector: 'third-party',
  inputs: [...FIRST_PARTY_PASSTHROUGH_INPUTS],
  template: `
<div>
  {{all}} , {{attrs}} ,  {{are}} ,  {{passed}}
</div>
  `
})
export class ThirdParty {
}

@Component({
  selector: 'first-party',
  inputs: [...FIRST_PARTY_OWN_INPUTS, ...FIRST_PARTY_PASSTHROUGH_INPUTS],
  template: `
<div>
  <div>
    {{not}} , {{passthrough}}
  </div>
  <third-party ${generateAttributes(FIRST_PARTY_PASSTHROUGH_INPUTS)}></third-party>
  <first-party-extra></first-party-extra>
</div>
  `,
  directives: [ThirdParty]
})
export class FirstParty {
}

@Component({
  selector: 'my-app',
  providers: [],
  template: `
    <div>
      <h2>Hello {{name}}</h2>
      <first-party [not]="'not'" [passthrough]="'passthrough'"  
                   [all]="'all'" [attrs]="'attrs'" [are]="'are'" [passed]="'passed'">
      </first-party>
    </div>
  `,
  directives: [FirstParty]
})
export class App {
  constructor() {
    this.name = 'Angular2 (Release Candidate!)'
  }
}

希望对您有帮助:)

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