尝试区分“[object Object]"时出错.angular 中只允许使用数组和可迭代对象 [英] Error trying to diff '[object Object]'. Only arrays and iterables are allowed in angular

问题描述

我正在尝试在前端显示数据，但出现上述错误.如何解决这个问题?

<块引用>

service.ts

rec_source(){var headers = new HttpHeaders().set('Authorization', 'Token' + localStorage.getItem('usertoken'));headers.append('Accept', 'application/json');变量选项 = {标题:标题};return this.httpClient.get('api/recruit/fetch_recruitment_details',options)}

<块引用>

component.ts

sources:any = [];构造函数(私有身份验证:AuthService){}ngOnInit() {this.Authentication.rec_source().订阅(来源=> {this.sources = 来源；});}

<块引用>

component.html

<头><tr><th>数据</th></tr></thead><tr *ngFor="let source of sources"><td>{{source}}</td></tr></tbody>

//需要显示的数据

//错误

解决方案

您的 api 响应不是数组或可迭代的，即错误所说的内容.它是对象，不能用 *ngFor 迭代.也许您想迭代 data_candidate_source 或 data_new_hiredate.在这种情况下，您需要为组件中的 source 属性分配正确的属性:

this.sources = source.data_candidate_source

或者当你想遍历对象时，你可以使用新添加的键值管道.

I'm trying to display the data on the front end but i get the above error. How to resolve this?

service.ts

rec_source(){
    var headers = new HttpHeaders().set('Authorization', 'Token ' + localStorage.getItem('usertoken'));
    headers.append('Accept', 'application/json');
    var options =  {
      headers: headers
  };
  return this.httpClient.get('api/recruit/fetch_recruitment_details',options)
  }

component.ts

sources:any = [];

constructor(private Authentication:AuthService) { }

ngOnInit() {

this.Authentication.rec_source()
  .subscribe(source => {
    this.sources = source;
  });
}

component.html

<table *ngIf="sources" class="row-border hover">
<thead>
  <tr>
    <th>Data</th>
  </tr>
</thead>
<tbody>
  <tr *ngFor="let source of sources">
    <td>{{ source}}</td>
  </tr>
</tbody>
</table>

//the data that needs to be displayed

//the error

解决方案

Your api response is not an array or iterable, that what the error says. It is object, which is not iterable with *ngFor. Maybe you wanted to iterate data_candidate_source or data_new_hiredate. In such case you need to assign correct property to your source property in component:

this.sources = source.data_candidate_source

Or when you want to iterate through object then you can use newly added keyvalue pipe.

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