Question

我正在使用Promise发出POST请求。我无法使用POST请求中返回的JSON数组更新全局变量records。

Export class WalletPage {

  private emailAddress;
  apiUrl = 'someapiurl';
  // records = [
  //   // { fieldA:'1', fieldb:one}, 
  //   // { fieldA:'2', fieldb:two}
  // ];

  records = [];

  constructor(public navCtrl: NavController, private httpClient: HttpClient) {
    this.restProvider = new RestProvider(this.httpClient);
  }

  submitEmail() {
    console.log('Trying to submit user email address: ', this.emailAddress);

    var rp = require('request-promise');    

   const payload = {"email_address": this.emailAddress}
   const records = [];
   var options = {
       method: 'POST',
       uri: this.apiUrl + '/order/userRecords',
       body: payload,
       json: true
   };

  rp(options)
  .then(function (parsedBody) {
    // POST succeeded...
     const someResponse = parsedBody.entries
     for (var i = 0, len = someResponse.length; i < len; i++) {
      console.log(someResponse[0]);
      records.push(someResponse[0])
      console.log('someArray is', records)
      this.records = records;
    }

  })
  .catch(function (err) {
    // POST failed
  });  
  }

}

看来this.records = records;实际上没有更新全局变量。我这样做是因为离子框架会识别这样的数组，并且可以在每个条目的表格中填充一行。

离子前端代码：

  <ion-list-header>
      Your records
  </ion-list-header>
  <ion-item *ngFor="let record of records">
    <ion-label>{{record.fielda}} with value: {{record.fieldb}} </ion-label>
  </ion-item>

Answer 1

这个变量不是WalletPage，它是窗口或其他东西，你应该像这样改进你的代码：

rp(options)
  .then((parsedBody) => {
});

或：

rp(options)
  .then(function (parsedBody) {
}.bind(this));

Node JS使用Promise的结果更新全局变量

1 个答案: