Can't bind to 'matDatepicker' since it

问题:

I have just copied and pasted angular material code for datePicker and input, but I am getting this error for the datePicker.

app.module

import {MaterialModule} from '@angular/material';
@NgModule({
imports: [
...
MaterialModule
]

<md-input-container>
    <input mdInput placeholder="Rechercher" [(ngModel)]="filterHistorique">
</md-input-container>

<md-input-container>
    <input mdInput [mdDatepicker]="picker" placeholder="Choose a date">
    <button mdSuffix [mdDatepickerToggle]="picker"></button>
</md-input-container>
<md-datepicker #picker></md-datepicker>

This is the error I am having in my browser:

Can't bind to 'mdDatepicker' since it isn't a known property of 'input' If 'md-datepicker' is an Angular component, then verify that it is part of this module. 2. If 'md-datepicker' is a Web Component then add "CUSTOM_ELEMENTS_SCHEMA" to the '@NgModule.schemas' of this component to suppress this message. (" [ERROR ->]

The error is for the datepicker, when I removed it, the errors disappears

回答1:

While using mat-datepicker, you have to import MatDatepickerModule as well, also MatNativeDateModule is recommended to be imported too. see docs here.

import { MaterialModule, MdDatepickerModule, MdNativeDateModule } from '@angular/material';
@NgModule({
  imports: [
    ...
    MaterialModule,            // <----- this module will be deprecated in the future version.
    MatDatepickerModule,        // <----- import(must)
    MatNativeDateModule,        // <----- import for date formating(optional)
    MatMomentDateModule         // <----- import for date formating adapted to more locales(optional)
  ]

For optional module of date formating, see Module for DateAdapter from material team.

Mention: please avoid using MaterialModule for it'll be deprecated in the future.

回答2:

you need to import FormsModule and ReactiveFormsModule if you used NgModule and formgroup. so your app.module should be like that

import {MaterialModule} from '@angular/material';
@NgModule({
  imports: [
    MdDatepickerModule,        
    MdNativeDateModule,
    FormsModule,
    ReactiveFormsModule
  ]

Note: MaterialModule Removed. please use separate module instead. like MdDatepickerModule see here https://github.com/angular/material2/blob/master/CHANGELOG.md#200-beta11-carapace-parapet-2017-09-21