javascript - 内部订阅的Angular 6等待方法

Question

我必须通过 forEach 多次调用服务，这是一种内部有订阅(http 调用)的方法，每次我都必须等待上一次调用结束。 这是代码:

itemDefaultConfiguration.command = (onclick) => {
   this.createConfiguration(configuration.components);
   //wait the end of createConfiguration method that has subscribe (http call) inside
   this.initializeAllComponents(configuration.components)
};

initializeAllComponents(components: Agent[]) {
    components.forEach(agent => {
      this.componentService.setAgent(agent);
      this.componentService.clearAnyOneOfIndex();
      // wait the end of setAgent method that has subscribe(http call) inside
    })
}

内部组件服务:

setAgent(agent: Agent) {
        this.agent = agent;
        this.selectComponent(agent.name, undefined, "/", "/", environment.maxLevelJsonSchema);
    }

并且 selectComponent 有订阅。

selectComponent(agentName: string, propName: string, schemaPath: string, dataPath: string, deepLevel: number) {
        this.getComponentSchema(this.agentName, schemaPath, deepLevel)
            .subscribe((responseSchema) => {
                this.getDataFailure(propName, dataPath, responseSchema); 
            });
}

你能帮帮我吗？谢谢

Answer 1

您可以使用 await 来做到这一点，比如:

initializeAllComponents(components: Agent[]) {
    components.forEach(async agent => {
      await this.componentService.setAgent(agent).catch(console.log);
      this.componentService.clearAnyOneOfIndex();
      // wait the end of setAgent method that has subscribe(http call) inside
    })
}