实现 async/await angular 7

Question

Can someone please help me implement async/await for this angular/typescript method

 onCustomerSelected(cId) { let cust = this.custlist.find((c) => c.custId == cId); this.service.setCustomer(cust); //need to await this method (note, this doesnt return promise) ... do some processing ... (note, i need to wait for the service to set customer first, before i can begin further processing) }

Answer 1

Assuming this.service.setCustomer returns a Promise , you just need to flag the function onCustomerSelected as async and then await this.serice.setCustomer

async onCustomerSelected(cId) {
    let cust = this.custlist.find((c) => c.custId == cId);

    await this.service.setCustomer(cust); //need to await this method (note, this doesnt return promise)

}

If this.service.setCustomer is an Observable , then you need to do await this.service.setCustomer(...).toPromise();

Answer 2

您需要将您的服务调用包装在一个 Promise 中并使用 await。

const result = await this.service.setCustomer(cust).toPromise()