如何让Angular编译器在返回前等待订阅

Question

I have a function has to return a value and inside it I have a subscription, my problem is the return line is being executed before the subscription end,

testFunc(){
let objectType;
          let moduleId;
          objectType = valueAsString.split('|');
          objectType = objectType[0];
          this.layoutService.moduleIdByType(objectType)
            .toPromise().then(data => {
              moduleId = data;
            });
          return { IsById: true, LinkedModule: moduleId };
}

here I have (moduleIdbytype) and it is changing the value of moduleId variable and I have to return after the subscription finished and changed the var's value

Answer 1

You can make your testFunc() async and await the subscription.

async testFunc(){
 let objectType;
 let moduleId;
 objectType = valueAsString.split('|');
 objectType = objectType[0];
 const moduleId  = await this.layoutService.moduleIdByType(objectType)
 .toPromise();
 return { IsById: true, LinkedModule: moduleId };
}