使用 Angular 10 在输入字段中显示 json 数据

Question

我有一个用户键入并成功提交的表单。我希望用户能够通过单击编辑图标来编辑该表单并编辑用户数据，我已经设法从 api 中提取数据，但是当我尝试为访问权限分配值时，它们都是null 我最终遇到了一个未定义的错误我做错了什么？

到目前为止我做了什么

   async ngOnInit(): Promise<void> {
        this._activatedroute.paramMap.subscribe(params => {
          this.id = params.get('id');
        });
        let user = this.service.getUserSession();
        if (user != null) {
          this.project = user.currentProject.id;
        }
        this.userSession = this.userSessionService.getSession("usersession");
        this.projectId = this.userSession.currentProject.id;
        this.totalTeamsData = await this.teamService.getTeamList(this.projectId);
        await this.getTicketData();
      }
    
      async getTicketData(): Promise<void> {
          this.ticketData = await this.ticketService.getTicket(this.id, this.projectId);
          await this.toggleTicketDetails();
        
      }
    
      toggleTicketDetails() {
        console.log("the dats is", this.ticketData); //this shows the data from the api with all the fields
console.log("the dats is", this.ticketData.title); //this shows undefined 

        this.title = this.ticketData.title;
        this.description = this.ticketData.description;
        this.teamId = this.ticketData.teamId;
        this.totalTeamsData.forEach(async (data: string) => {
          if (data === this.teamId) {
            this.totalTeamMembersData = await this.teamService.getTeamMembers(this.projectId, this.teamId);
            this.totalEAData = await this.teamService.getTeamEAList(this.projectId, this.teamId);
          }
        });
        this.assignedTo = this.ticketData.assignedTo;
        this.eaId = this.ticketData.eaId;
        this.countryId = this.ticketData.countryId;
        this.projectId = this.ticketData.projectID;
        this.country = this.ticketData.country;
        this.priority = this.ticketData.priority;
        this.category = this.ticketData.category;
        this.status = this.ticketData.status;
        this.lab = this.ticketData.lab;
        this.impact = this.ticketData.impact;
        this.content = this.ticketData.content;
        this.resolution = this.ticketData.resolution;
      }

当我控制台记录 console.log("the dats is", this.ticketData); 时，json 就在那里

[    
   {
      "id": "4e600c3d-efed-43c2-b395-6238510dda24",
      "title": "Test",
      "assignedTo": "tester@gmail.com",
      "description": "Test",
      "resolution": null,
      "country": "USA",
      "projectID": "ABC",
      "teamId": "901",
      "eaId": "901",
      "countryId": "0001",
      "priority": "Urgent",
      "status": "Open",
      "lab": null,
      "category": "Duplicate",
      "content": null,
      "impact": null,
      "dateCreated": 1619313188806,
      "createdBy": "tester@gmail.com"
    }
]

这是控制台日志快照

为什么这给了我未定义的 this.title = this.ticketData.title; 和所有其他人？

HTML样本

<div class="row">
                        <div class="col-md-12">
                            <div class="form-group">
                                <label for="title" style="color: black;">Title<span style="color: red;">*</span></label>
                                <input type="text" class="form-control" style="color: black;"
                                    required id="title" name="title" [(ngModel)]="title">
                            </div>
                        </div>
                    </div>
                    <div class="row">
                        <div class="col-md-12">
                            <div class="form-group">
                                <label for="description" style="color: black;">Description<span style="color: red;">*</span></label>
                                <textarea type="text" class="form-control" rows="3" style="color: black;"
                                    required id="description" name="description" [(ngModel)]="description">
                                </textarea>
                            </div>
                        </div>
                    </div>

Answer 1

你应该这样使用

.....

ticketData: any;
ticketDataParsed: any;
title: string;

.....

// Parse from JSON 
this.ticketDataParsed = JSON.parse(this.ticketData);
this.title = this.ticketDataParsed.title

已编辑

由于控制台日志代表一个数组，因此您需要像这样访问数组对象属性：

this.ticketData[0].title

Answer 2

你的端点return结果是对象数组而不是单个对象，你可以在控制台日志中注意到这一点。日志以“[”开头表示数据是数组。

您可以通过访问数组的第一个元素然后将其分配给工单数据来解决此问题，如下所示：

this.ticketData = (await this.ticketService.getTicket(this.id, this.projectId))[0];

当然，您可以像这样检查空响应数组以提供更好的用户体验：

let dump = await this.ticketService.getTicket(this.id, this.projectId);
if(!dump && dump.length==0)
{
    //Notify the user of empty data
}
else {
    this.ticketData = await this.ticketService.getTicket(this.id, this.projectId);
    await this.toggleTicketDetails();

}

使用 Angular 10 在输入字段中显示 json 数据

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