在 angular2 中构建包装器指令(包装一些内容/组件) [英] Building a wrapper directive (wrap some content / component) in angular2

问题描述

我是 Angular2 的新构建指令.我想要的是创建一个弹出指令，用一些 css 类包装内容.

内容

内容可以是纯文本和标题，例如:

<h2>标题</h2>内容要放在这里.

然后我想给它一个指令属性，如:popup

<h2>标题</h2>内容要放在这里.

指令应该做的是将 div 包裹在里面，让我们说:

<div class="其他类"><div class="数据"><h2>标题</h2>内容要放在这里.

到目前为止我描述的情况，这是一个属性还是结构指令.

import { Directive, ElementRef, HostListener, Input } from '@angular/core';@指示({选择器:`[弹出]`})导出类 PopupDirective {}

解决方案

另一个答案是相关但不同的.

有关更详细的信息，请参阅:如何有条件地在 ng-content 周围包裹一个 div - 我的解决方案是针对 Angular 4，但链接的问题有一些关于这对于 Angular 2 可能如何可行的提示.

我用一个组件和一个指令组合解决了这个问题.我的组件看起来像这样:

import { Component, Input, TemplateRef } from '@angular/core';@成分({选择器:'我的包装容器'，模板:`<div class="whatever"><ng-container *ngTemplateOutlet="template"></ng-container>

`})导出类 WrapperContainerComponent {@Input() 模板:TemplateRef;}

我的指令是这样的:

import { Directive, OnInit, Input, TemplateRef, ComponentRef, ComponentFactoryResolver, ViewContainerRef } from '@angular/core';@指示({选择器:'[myWrapperDirective]'})导出类 WrapperDirective 实现 OnInit {私有包装容器:ComponentRef;构造函数(私有模板引用:模板引用<任何>，私有 viewContainerRef: ViewContainerRef,私有 componentFactoryResolver: ComponentFactoryResolver) { }ngOnInit() {const containerFactory = this.componentFactoryResolver.resolveComponentFactory(WrapperContainerComponent);this.wrapperContainer = this.viewContainerRef.createComponent(containerFactory);this.wrapperContainer.instance.template = this.templateRef;}}

为了能够动态加载您的组件，您需要将您的组件列为 entryComponent 在你的模块中:

@NgModule({进口:[CommonModule]，声明: [WrapperContainerComponent, WrapperDirective],出口:[WrapperContainerComponent，WrapperDirective]，entryComponents: [WrapperContainerComponent]})导出类 MyModule{}

所以最后的 HTML 是:

呈现为:

<div class="whatever"><some_tag/>

</my-wrapper-container>

I'm pretty new building directives with Angular2. What I want is to create a popup directive that will wrap the content with some css classes.

Content

Content can be pure text and headers like:

<div class="data">
    <h2>Header</h2>
    Content to be placed here.
</div>

Then I want to give this a directive attribute like: popup

<div class="data" popup>
    <h2>Header</h2>
    Content to be placed here.
</div>

What the directive should do, is to wrap the div inside, lets say:

<div class="some class">
    <div class="some other class">
        <div class="data">
            <h2>Header</h2>
            Content to be placed here.
        </div>
    </div>
</div>

The case i described so far, is this a attribute or structural directives.

import { Directive, ElementRef, HostListener, Input } from '@angular/core';

@Directive({
  selector: `[popup]`
})

export class PopupDirective {


}

解决方案

The other answer is related but different.

For something closer, see this: How to conditionally wrap a div around ng-content - my solution is for Angular 4, but the linked question has some hints about how this might be doable for Angular 2.

I solved this problem with a component and a directive combined. My component looks something like this:

import { Component, Input, TemplateRef } from '@angular/core';

@Component({
  selector: 'my-wrapper-container',
  template: `
<div class="whatever">
  <ng-container *ngTemplateOutlet="template"></ng-container>
</div>
`
})
export class WrapperContainerComponent {
  @Input() template: TemplateRef<any>;
}

and my directive like this:

import { Directive, OnInit, Input, TemplateRef, ComponentRef, ComponentFactoryResolver, ViewContainerRef } from '@angular/core';

@Directive({
  selector: '[myWrapperDirective]'
})
export class WrapperDirective implements OnInit {

  private wrapperContainer: ComponentRef<WrapperContainerComponent>;

  constructor(
    private templateRef: TemplateRef<any>,
    private viewContainerRef: ViewContainerRef,
    private componentFactoryResolver: ComponentFactoryResolver
  ) { }

  ngOnInit() {
    const containerFactory = this.componentFactoryResolver.resolveComponentFactory(WrapperContainerComponent);
    this.wrapperContainer = this.viewContainerRef.createComponent(containerFactory);
    this.wrapperContainer.instance.template = this.templateRef;
  }
}

To be able to load your component dynamically, you need to list your component as an entryComponent inside your module :

@NgModule({
  imports: [CommonModule],
  declarations: [WrapperContainerComponent, WrapperDirective],
  exports: [WrapperContainerComponent, WrapperDirective],
  entryComponents: [WrapperContainerComponent]
})
export class MyModule{}

so the HTML in the end is:

<some_tag *myWrapperDirective />

Which renders as:

<my-wrapper-container>
  <div class="whatever">
    <some_tag />
  </div>
</my-wrapper-container>

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