angular(formGroup)

<form class="input-top" [formGroup]="searchForm" >/*在form表單中使用formGroup定義一個名稱*/
        <mat-form-field color="primary" appearance="outline">
            <mat-label>查詢開始時間</mat-label>
            <input matInput type="text" maxlength="40"
                   formControlName="startPicker"/*定義字段名稱*/
                   [matDatepicker]="startPicker"
                   placeholder="查詢開始日期" formControldigital="startTime">
            <mat-datepicker-toggle matSuffix [for]="startPicker"></mat-datepicker-toggle>
            <mat-datepicker #startPicker></mat-datepicker>
        </mat-form-field>
        <mat-form-field color="primary" appearance="outline">
            <mat-label>查詢結束時間</mat-label>
            <input matInput type="text" maxlength="40" formControlName="endPicker"
                   [matDatepicker]="endPicker" placeholder="查詢開始日期"
                   formControldigital="startTime">
            <mat-datepicker-toggle matSuffix [for]="endPicker"></mat-datepicker-toggle>
            <mat-datepicker #endPicker ></mat-datepicker>
        </mat-form-field>
        <notadd-query-month  (monthDate)="onMonthClick($event)"
                             [disableDate]="{startDate: searchForm.value.startPicker , endDate: searchForm.value.endPicker}">
        ></notadd-query-month>
        <div class="example-button-row right">
            <button mat-raised-button color="primary" (click)="onView()" >
                <mat-icon>
                    visibility
                </mat-icon>
                查看報表
            </button>
        </div>
    </form>

　　

import { FormGroup, FormBuilder, AbstractControl , FormControl } from '@angular/forms';/*導入FormGroup等*/

constructor(
    private formBuilder: FormBuilder/*將FormBuilder注冊*/

) {
    this.nav = 0;
    this.searchForm = this.formBuilder.group({/*定義字段*/
        startPicker: '',
        endPicker: ''
    });
}

get startPicker(): AbstractControl {
        return this.searchForm.get('startPicker');
    }

    get endPicker(): AbstractControl {
        return this.searchForm.get('endPicker');
    }/*獲取定義字段數據*/