How disable all the dates before a particular date

问题:

I am building a component (html, css, spec.ts, ts) in angular in which I always want endDate > startDate. I have followed this link https://material.angular.io/components/datepicker/overview in order make multiple datepickers.

Below is my HTML for startDate and endDate:

startDate:

<div class="start-date" fxFlex="50%" fxFlexOrder="1">
          <mat-form-field>
            <input matInput [matDatepicker]="picker1" placeholder="{{'PORTAL.STARTDATE' | translate}}" type="text" formControlName="startDate" [(ngModel)]="unavailability.startDate" [readonly]="!componentPermission.writePermission">
            <mat-datepicker-toggle matSuffix [for]="picker1"></mat-datepicker-toggle>
            <mat-datepicker #picker1></mat-datepicker>
          </mat-form-field>
        </div>

endDate:

<div class="end-date" fxFlex="50%" fxFlexOrder="2">
           <mat-form-field>
      <input matInput [matDatepicker]="picker2" placeholder="{{'PORTAL.ENDDATE' | translate}}" type="text" formControlName="endDate" [(ngModel)]="unavailability.endDate" [readonly]="!componentPermission.writePermission">
      <mat-datepicker-toggle matSuffix [for]="picker2"></mat-datepicker-toggle>
      <mat-datepicker #picker2></mat-datepicker>
   </mat-form-field>
        </div>

Now below is my angular code (ts) where I am calling validateForm method on the page load.

ngOnInit() {
    ....
    this.validateForm();
}

validateForm() {
    this.unavailabilityForm = this.formBuilder.group({
     'startDate': ['', Validators.required],
     'endDate': ['', Validators.required],
     'unavailabilityReason': ['']
    });
}

ProblemStatement:

Now what I need to do is - if I have selected any date in startDate (for example 23rd Nov), then in the endDate datepicker all the dates before and including 23rd Nov should be disabled so that I can only select dates after 23rd Nov only. Is this possible to do in Angular?

Can we achieve that by placing minDate and maxDate somewhere in HTML or TS ?

回答1:

Since you are using a reactive form, utilize the form controls. It's not recommended to have two bindings (ngModel and formControl). So drop the ngModel like I suggested in a previous question of yours: https://stackoverflow.com/a/47426879/6294072

So populate your form controls with the values of from your object unavailability.

constructor(private formBuilder: FormBuilder) { 
  this.unavailabilityForm = this.formBuilder.group({
    startDate: [this.unavailability.startDate],
    endDate: [this.unavailability.endDate]
  });  
}

if you are receiving the values at a later point you can use patchValues:

this.unavailabilityForm.setValue({
  startDate: this.unavailability.startDate;
  endDate: this.unavailability.endDate;
})

else you can set the values when you build the form.

Then the only thing you need to add to your second datepicker is [min] like the other answer mentioned. There utilize the form control value:

<input matInput 
       [min]="unavailabilityForm.controls.startDate.value" 
       formControlName="endDate" ...>

DEMO

回答2:

Binding with [min] works perfect for any date

.ts file

//today's date
todayDate:Date = new Date();

//any date
someDate: Date = new Date(anydate);

.html file

 <mat-form-field>
        <input matInput [matDatepicker]="picker" [min]="todayDate" placeholder="Appointment date" formControlName="appointment_date"> 
        <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
        <mat-datepicker #picker></mat-datepicker>
  </mat-form-field>

回答3:

Unless I'm missing something, you can use the [min]="" date property:

<div class="item item-2" fxFlex="50%" fxFlexOrder="2">
   <mat-form-field>
      <input matInput [min]="startDate" [matDatepicker]="picker2" placeholder="{{'PORTAL.ENDDATE' | translate}}" type="text" formControlName="endDate" [(ngModel)]="unavailability.endDate" [readonly]="!componentPermission.writePermission">
      <mat-datepicker-toggle matSuffix [for]="picker2"></mat-datepicker-toggle>
      <mat-datepicker #picker2></mat-datepicker>
   </mat-form-field>
</div>

Whatever startDate is will limit the Calendar dates available for endDate. If you need it set before startDate is chosen, use another variable and set it in consturctor() or ngOnInit() of your component.

See: https://material.angular.io/components/datepicker/overview#date-validation

回答4:

I used

[min]="startDate.value"

and worked like expected (disabled endDate calendar previous dates from selected date in startDate Calendar)

回答5:

<mat-form-field >
    <input placeholder="Enter Date" matInput
        [matDatepicker]="picker1"
        formControlName="voucherExpirationDate"
        [min]="minDate">
    <mat-datepicker-toggle matSuffix [for]="picker1"></mat-datepicker-toggle>
    <mat-datepicker    #picker1></mat-datepicker>
</mat-form-field>