Angular CDK：覆盖配置中的FlexibleConnectedPositionStrategy出现错误

Question

我想使用overlay.position().flexibleConnectedTo()配置覆盖，因为根据官方文档，connectedTo()已被弃用。否则有一个问题对connectedTo()有一个很好的答案

这是我的代码

    const origin:FlexibleConnectedPositionStrategyOrigin=this.RefElem;
    const overlayConfig = new OverlayConfig();
    overlayConfig.positionStrategy = this.overlay.position().flexibleConnectedTo(origin);
    const overlayRef = this.overlay.create(overlayConfig);
    const userProfilePortal = new ComponentPortal(
      GraphMetaSignalSelectorComponent
    );
    overlayRef.attach(userProfilePortal);

但出现此错误：“ConnectedToFlexibleConnectedPositionStrategy：至少需要一个位置。在FlexibleConnectedPositionStrategy.push”

Answer 1

对于那些因为缺乏 的实现而坚持接受的答案的人来说this.getPositions()，这里有一个复制粘贴的快速示例：

const positionStrategy = this.overlay.position()
      .flexibleConnectedTo(origin)
      .withPositions([{
        // here, top-left of the overlay is connected to bottom-left of the origin; 
        // of course, you can change this object or generate it dynamically;
        // moreover, you can specify multiple objects in this array for CDK to find the most suitable option
        originX: 'start',
        originY: 'bottom',
        overlayX: 'start',
        overlayY: 'top'
      } as ConnectedPosition])
      .withPush(false); // or true, if you want to push the overlay into the screen when it doesn't fit