Angular 在输入字段中以角度10显示json数据

我有一个表单，用户输入并成功提交。我希望用户能够通过单击编辑图标编辑该表单并编辑用户数据，我已设法从api中提取数据，但当我尝试将访问值分配给所有为空的值时，我最终会出现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;
      }

这是一个控制台日志快照

为什么这给了我未定义的

this.title=this.ticketData.title和所有其他

HTML示例

<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>


头衔*
描述*
您应该这样使用

.....

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

.....

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

已编辑

由于控制台日志表示一个数组，因此您需要访问数组对象属性，如下所示：

this.ticketData[0].title

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

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();

端点以对象数组而不是单个对象的形式返回结果，您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，然后将其分配给票证数据来解决此问题，如下所示：

this.ticketData[0].title

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

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();

当然，您可以检查空响应数组以提供更好的用户体验，如下所示：

this.ticketData[0].title

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

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();

}
在将响应分配给
this.ticketData
之前，您是否分析了响应？您可以在
this.toggleTicketDetails（）
之前删除
等待
。您是否检查了
this.ticketData
的类型？Hi@iamentafaz它是一个数组，那么您应该使用
this.ticketData[0]
访问property@arriff请将您的代码放入
stackblitz
进行调试。您好@Salahuddin仍然没有定义。您可以将
this.ticketData
从api中显示的数据以及所有字段显示出来吗？您可以将它放入
this.title=this.ticketData.title；
的
中吗
看看会发生什么？