Angular CDK叠加层，更改默认叠加层容器 [英] Angular CDK Overlay, change default overlay container

问题描述

是否可以更改OverlayContainer?

Is there a way to change the OverlayContainer?

我已经创建了一个工具提示组件，但有时我想将覆盖图附加到特定元素(默认情况下，覆盖图附加到文档主体).

I have created a tooltip component, but sometimes I want to attach the overlay to a specific element (by default the overlay is attached to the document body).

这是我创建叠加层的方式:

Here is how I am creating the overlay:

  private initOverlay(): void {
    const positionStrategy = this.overlayPositionBuilder
      .flexibleConnectedTo(this.elementRef)
      .withPositions([this.resolvedConfig]);

    this.overlayRef = this.overlay.create({positionStrategy});
  }

这是我将模板附加到它的方式:

And this is how I am attaching a template to it:

  show(): void {
    this.overlayRef.attach(new TemplatePortal(this.tpl, this.viewContainerRef));
  }

推荐答案

请参考以下stackblitz示例.

Please reference this stackblitz example.

看起来您可以通过扩展 通过app.module.ts

looks like you can accomplish this by extending the OverlayContainer class via the following in app.module.ts

{ provide: OverlayContainer, useFactory: () => new AppOverlayContainer() }

Stackblitz

https://stackblitz.com/编辑/angular-material2-issue-ansnt5?file=app%2Fapp.module.ts

此GitHub注释还提供了如何将其打包到directive

This GitHub comment also provides an example of how to package this in a directive

GitHub评论

https://github.com/angular/material2/issues/7349# issuecomment-337513040

19/3/22修订版工作指令示例

通过cdk-overlay-container.ts

在app.module.ts

  providers: [
    { provide: OverlayContainer, useClass: CdkOverlayContainer },
  ]

在您的cdk-overlay-container.ts中，您将阻止默认的_createContainer()工作，并提供您自己的自定义公共方法myCreateContainer来替换它.

In your cdk-overlay-container.ts you are preventing the default _createContainer() from working, and providing your own custom public method myCreateContainer to replace it.

您实际上是在此处创建一个空的div，向其中添加一个自定义类my-custom-overlay-container-class，并将其附加到 div指令附加到该容器，然后将该容器传递给 真正的OverlayContainer中的私有变量_containerElement 课.

You are essentially creating an empty div here, adding a custom class to it my-custom-overlay-container-class and appending it to the div the directive is attached to, then passing that container to the private variable _containerElement in the true OverlayContainer class.

/**
* Create overlay container and append to ElementRef from directive
*/ 
public myCreateContainer(element: HTMLElement): void {
   let container = document.createElement('div');
   container.classList.add('my-custom-overlay-container-class');

   element.appendChild(container);
   this._containerElement = container;
 }
 /**
  * Prevent creation of the HTML element, use custom method above
  */
 protected _createContainer(): void {
     return;
 }

然后在您的cdk-overlay-container.directive.ts中，您正在调用myCreateContainer()并将ElementRef作为参数传递.

Then in your cdk-overlay-container.directive.ts your are calling myCreateContainer() and passing the ElementRef as an argument.

 this.cdkOverlayContainer['myCreateContainer'](this.elementReference.nativeElement);

然后在HTML中将指令分配到您希望其显示的位置.

Then in your HTML assign the directive where you want it to show up.

<div myCdkOverlayContainer 

Stackblitz

https://stackblitz.com/edit/angular-material2-issue-6nzwws?embed=1&file=app/app.component.html

这篇关于Angular CDK叠加层，更改默认叠加层容器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！