管道'DatePipe'的参数'日期格式'无效？

Question

这似乎是一个简单的问题.我在Ionic 2应用程序中使用管道作为日期格式.这是收到的webservice响应.

 [
  {
    "MessageID": 544882,
    "CategoryID": 1,
    "DateSent": "2015-05-18T02:30:56",
    "Title": "Jobseeker App",
    "MessageContent": "Hi Test guy just started to use the app..",
    "Sender": null,
    "Recipient": null,
    "DateReceived": null,
    "DateRead": "2015-05-18T02:30:56",
    "Note_Direction": "sent",
    "Viewed": 0,
    "AppointmentDateTime": null,
    "MessageAttachments": [

    ]
  },
  {
    "MessageID": 544886,
    "CategoryID": 1,
    "DateSent": "2015-05-18T02:42:45",
    "Title": "Jobseeker App",
    "MessageContent": "App",
    "Sender": null,
    "Recipient": null,
    "DateReceived": null,
    "DateRead": "2015-05-18T02:42:45",
    "Note_Direction": "sent",
    "Viewed": 0,
    "AppointmentDateTime": null,
    "MessageAttachments": [

    ]}
   ]

这是我正在使用的代码片段.

<div class="Date">
<label class="time">{{appointment.DateSent | date:"HH"}}:{{appointment.DateSent| date:"mm"}}</label>
<label class="month">{{appointment.DateSent| date:"MMM"}}</label>
<label class="day">{{appointment.DateSent| date:"dd"}}</label>
<label class="year">{{appointment.DateSent| date:"yyyy"}}</label>
</div>

错误:

Invalid argument '2015-05-18T02:30:56' for pipe 'DatePipe' in [{{appointment.DateSent | date:"HH"}}:{{appointment.DateSent| date:"mm"}} in AppointmentsPage@14:37]

我需要得到这样的日期格式:

06:05
Dec
24
2015

Answer 1

你传递错误的参数,所以角度投掷错误.用这个改变了你的日期代码:

birthday = 2015-05-18T02:30:56 //Working
birthday2 = new Date(2015-05-18T02:30:56) //Working

Oldbirthday = '2015-05-18T02:30:56'  //Not Working

这里我使用变量birthday而不是变量名.也许错误的原因是angular可能不接受日期格式作为字符串.据我说.但作为官员

• 此管道标记为纯,因此在输入发生变异时不会重新评估.相反,用户应将日期视为不可变对象,并在管道需要重新运行时更改引用(这是为了避免在每次更改检测运行时重新格式化日期,这将是一项昂贵的操作). https://angular.io/docs/ts/latest/api/common/DatePipe-class.html

工作plnkr http://plnkr.co/edit/b9Z090rQpozMoMi0BWaY?p=preview

更新:

正如@Kanishka所要求的那样,您可以更新日期并new date()从HTML方面转换为必须调用打字稿的setter和getter函数.这是您正在寻找的一个例子.所以通过使用它,我认为你不需要从响应中创建自己的数组.我希望它可能对你有所帮助,并建议你使用一种新的方法来播放来自前端的响应.

<label>{{setDate('2015-05-18T02:30:56') | date:"yyyy"}}</label>

  get Anotherdate(){  //getter function
    return this.date
  }
  setDate(date) {
    this.Anotherdate = date;
    return this.Anotherdate;
  }
  set Anotherdate(date){     // Setter Function
    this.abc = new Date(date)
  }

这里是更新的工作演示 http://plnkr.co/edit/rHCjevNcol12vwW6B38u?p=preview