Question

上次我尝试以 angular 进行订阅和映射是在 2 年前。我厌倦了，我尝试了一周或更长时间来映射这些值，而最接近的尝试却让我出错：无法读取未定义的属性“名称”。

这是我的代码：

this.languageService.getAllLanguages().subscribe(languages =>{
      this.languages = languages.map((language)=>{
        return {
          Id:language.Id, 
          Name: language.Name,
          Code: language.Code,
          Charset: language.Charset,
          Default: language.Default,
          Active: language.Active,
          SystemId: language.SystemId
        }
      })
    })



    this.languageTableElements = [
      {
        type: 'checkbox'
      },
      {
        type: 'icon',
        label: this.languages[0].Name,
        icon: 'assets/icons/flag_pl.png'
      }
    ]

Answer 1

需要在订阅回调中使用 languages（当它有值时！）

this.languageService.getAllLanguages().subscribe(languages =>{
  this.languages = languages.map((language)=>{
    return {
      Id:language.Id, 
      Name: language.Name,
      Code: language.Code,
      Charset: language.Charset,
      Default: language.Default,
      Active: language.Active,
      SystemId: language.SystemId
    }
  })

  this.languageTableElements = [
    {
      type: 'checkbox'
    },
    {
      type: 'icon',
      label: this.languages[0].Name,
      icon: 'assets/icons/flag_pl.png'
    }
  ]
})

角度错误：无法读取未定义的属性“名称”

1 个答案: