Question

我想在JSON响应中循环主题数组

JSON响应：

{
"$id": "1",
"Council_ID": 116,
"number": "67",
"subjects": [
    {
        "$id": "2",
        "subjectCode": "67",
        "type": 4,
    },
    {
        "$id": "3",
        "subjectCode": "67",
        "type": 4,
    }
   ]
}

model.component.ts：

this.dataStorageService.storeSubjects(newSubject, this.meetingID)
        .subscribe(
        response => {
            this.dataStorageService.getCouncilId(this.meetingID).subscribe(response => {
                this.subjectsWithID = response.json();
                this.sublength = this.subjectsWithID.subjects.length;
                console.log(this.sublength);
                for(let i = 0 ; i <= this.sublength; i++){
                    this.typee = this.subjectsWithID.subjects[i].type;
                    this.dataStorageService.getSubjectTypeId(this.typee).subscribe(response =>{
                        this.namesOfSub = Array.of( response.json());
                        console.log(this.namesOfSub)
                    });
                }
                // console.log(this.typee, 'bla bla');
            });
            this.addSubjectForm.reset();
            this.router.navigate(['/model']);
            return true;

这给了我错误： - 财产＆＃39;科目＆＃39;类型＆＃39;任何[]＆＃39;都不存在。有什么建议摆脱这个错误？

Answer 1

确定使用httpClient，你无法获取属性this.subjectsWithID.subjects，但是使用http是可能的，这是因为httpClinet解析结果时它确实知道对象的共享，你必须给出一个类型对于您的结果，或者您可以访问您的财产：

  this.subjectsWithID['subjects']

或者您可以使用interface指定类型：

    return this.http.get<myObject>(...url)

 interface Sidebar {
    id: number;
    Council_ID: number,
    number: number,
    subjects: [...
  }

使用typescript在JSON中循环数组

1 个答案: