Angular Material Datepicker：选择日期时不会触发更改事件

Question

我正在使用 Angular 和 Angular Material 的 Datepicker。 大多数情况下一切正常，但是我添加了一个(change)事件，该事件仅在用户手动输入日期时才有效。 当用户单击日期选择器弹出窗口中的日期时，它不会被触发。 需要明确的是，当用户单击某个日期时， date的值实际上会发生变化，这只是(change)事件，最终我的updateCalcs()函数由于某种原因没有被触发。 当用户单击日期选择器中的日期时，如何触发事件？

<md-input-container>
    <input mdInput [mdDatepicker]="datePicker" placeholder="Choose Date" name="date" [(ngModel)]="date" (change)="updateCalcs()" required>
    <button mdSuffix [mdDatepickerToggle]="datePicker"></button>
</md-input-container>
<md-datepicker #datePicker></md-datepicker>

Answer 1

在文本框中编辑日期和通过日历控件更改日期时，都会引发dateChange事件。 看这里

<mat-form-field>
  <input matInput [matDatepicker]="datepicker" required placeholder="Choose a date" (dateChange)="valueChanged()">
  <mat-datepicker-toggle matSuffix [for]="datepicker"></mat-datepicker-toggle>
  <mat-datepicker #datepicker></mat-datepicker>
</mat-form-field>

Answer 2

用ngModelChange替换change

更改自

<input mdInput 
       [mdDatepicker]="datePicker" 
       placeholder="Choose Date" 
       name="date" [(ngModel)]="date" 
       (change)="updateCalcs()" required>

到

<input mdInput 
       [mdDatepicker]="datePicker" 
       placeholder="Choose Date" 
       name="date" [(ngModel)]="date" 
       (ngModelChange)="updateCalcs()" required>

Answer 3

<mat-form-field>
  <input matInput [matDatepicker]="picker" placeholder="Input & change events"
         (dateInput)="addEvent('input', $event)" (dateChange)="addEvent('change', $event)">
  <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
  <mat-datepicker #picker></mat-datepicker>
</mat-form-field>

和.ts

addEvent(type: string, event: MatDatepickerInputEvent<Date>) {
    //console.log(event.value)
}

在这里查看

Answer 4

在md-datepicker使用selectedChanged 。

<md-datepicker #datePicker (selectedChanged)="updateCalcs($event)"></md-datepicker>

$event将发出您可以在updateCalcs()函数中使用的新值。

updateCalcs(event){
  console.log(event);
}

类似演示

Answer 5

我必须补充一点， (dateInput)并不总是为我开火，最终使用(keyup)

代码 HTML

  <mat-form-field>
        <input #fromInput matInput [matDatepicker]="pickerFrom" placeholder="סנן תאריך התחלה" 
          (dateChange)="filterFrom($event)" (keyup)="filterInputKeyupFrom()">
        <mat-datepicker-toggle matSuffix [for]="pickerFrom"></mat-datepicker-toggle>
        <mat-datepicker #pickerFrom></mat-datepicker>
    </mat-form-field>

最终代码 TS

 private parseInputDate(v):Date{
      //this was a manual change in the input and needs to be parsed
      let a:Array<any> = v.split('.')
      a.forEach((v, i) => a[i] = parseInt(v) + (i == 1 ? -1 : 0))
      console.log(new Date(a[2], a[1], a[0]))
      return  new Date(a[2], a[1], a[0])
  }

  //(dateInput) wasn't always firing for me, ended up using (keyup)
  filterInputKeyupFrom(){
    this.lastFrom = this.parseInputDate(this.fromInput.nativeElement.value)
    if (this.lastFrom) {
      this.lastFrom.setSeconds(-1)
    }
    this.filterDates()
  }

  filterInputKeyupUpTo(){
    this.lastTo = this.parseInputDate(this.toInput.nativeElement.value)
    if (this.lastTo) {
      this.lastTo.setDate(this.lastTo.getDate()+1)
    }
    this.filterDates()
  }

  filterFrom(e:MatDatepickerInputEvent<Date>){
    console.log('filterFrom')
    //changing manually the input and then exit from it fires here
    if(e.value){
      //need to clone the date or changes are applied on the Picker
      this.lastFrom = new Date(e.value)
      if (this.lastFrom) {
        this.lastFrom.setSeconds(-1)
      }
      this.filterDates()
    }
  }

  filterUpTo(e:MatDatepickerInputEvent<Date>){
    console.log('filterUpTo')
    if(e.value){
      this.lastTo = new Date(e.value)
      if (this.lastTo) {
        this.lastTo.setDate(this.lastTo.getDate()+1)
      }
      this.filterDates()
    }
  }

Answer 6

您可以使用 ng-change 来获取更改后的数据

<md-datepicker ng-change="updateCalcs()"></md-datepicker>

检查这里