我正在尝试在我的Angular 2项目中使用Angular Material Autocomplete组件。我将以下内容添加到模板中。
<md-input-container>
<input mdInput placeholder="Category" [mdAutocomplete]="auto" [formControl]="stateCtrl">
</md-input-container>
<md-autocomplete #auto="mdAutocomplete">
<md-option *ngFor="let state of filteredStates | async" [value]="state">
{{ state }}
</md-option>
</md-autocomplete>
下面是我的组件。
import {Component, OnInit} from "@angular/core";
import {ActivatedRoute, Router} from "@angular/router";
import {FormControl} from "@angular/forms";
@Component({
templateUrl: './edit_item.component.html',
styleUrls: ['./edit_item.component.scss']
})
export class EditItemComponent implements OnInit {
stateCtrl: FormControl;
states = [....some data....];
constructor(private route: ActivatedRoute, private router: Router) {
this.stateCtrl = new FormControl();
this.filteredStates = this.stateCtrl.valueChanges.startWith(null).map(name => this.filterStates(name));
}
ngOnInit(): void {
}
filterStates(val: string) {
return val ? this.states.filter((s) => new RegExp(val, 'gi').test(s)) : this.states;
}
}
我得到如下错误。看起来好像没有找到formControl指令。
不能绑定到'formControl'因为它不是'input'的已知属性
这里的问题是什么?
首先在模板中添加一个普通的matInput。让我们假设您正在使用ReactiveFormsModule中的formControl指令来跟踪输入的值。
响应式表单提供了一种模型驱动的方法来处理值随时间变化的表单输入。本指南向您展示如何创建和更新简单表单控件，如何在组中使用多个控件，如何验证表单值，以及如何实现更高级的表单。
import { FormsModule, ReactiveFormsModule } from "@angular/forms"; //this to use ngModule
...
imports: [
BrowserModule,
AppRoutingModule,
HttpModule,
FormsModule,
RouterModule,
ReactiveFormsModule,
BrowserAnimationsModule,
MaterialModule],
对我来说有用的是在@component({})的模板中构建表单，例如——
import { Component, OnInit } from '@angular/core';
import { FormControl } from '@angular/forms';
@Component({
selector: 'app-contact-form',
template:`
<form class="validation-form" validate method="createUserWithEmailAndPassword">
<div class="form-row">
<div class="col-md-6 mb-3">
<label for="firstName">First name</label>
<input type="text" [formControl]="firstName" id="firstName" placeholder="Please enter your first name" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
<div class="col-md-6 mb-3">
<label for="lastName">Last name</label>
<input type="text" [formControl]="lastName" id="lastName" placeholder="Please enter your last name" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
</div>
<div class="form-row">
<div class="col-md-6 mb-3">
<label for="email">Email address</label>
<input type="email" [formControl]="email" id="email" aria-describedby="emailHelp" placeholder="Please enter your last name" required>
<small id="emailHelp" class="form-text text-muted">We'll never share your email with anyone else.</small>
<div class="valid-feedback">
Looks good!
</div>
</div>
</div>
<div class="col-md-6 mb-3">
<label for="password">Password</label>
<input type="password" [formControl]="password" id="password" placeholder="Please enter your password" required>
<div class="valid-feedback">
Looks good!
</div>
</div>
<div class="col-md-3 mb-3">
<label for="zip">Zip</label>
<input type="text" [formControl]="zip" id="zip" required>
<div class="invalid-feedback">
Please provide a valid zip.
</div>
</div>
</div>
<div class="form-group">
<div class="form-check">
<input class="form-check-input" type="checkbox" value="" id="invalidCheck" required>
<label class="form-check-label" for="invalidCheck">
Agree to terms and conditions
</label>
<div class="invalid-feedback">
You must agree before submitting.
</div>
</div>
</div>
<button class="btn btn-primary" type="submit">Submit form</button>
</form>`,
templateUrl: './contact-form.component.html',
styleUrls: ['./contact-form.component.scss']
})
export class ContactFormComponent implements OnInit {
firstName = new FormControl('');
lastName = new FormControl('');
email = new FormControl('');
password = new FormControl('');
constructor() { }
ngOnInit(): void {
}
}
这停止显示错误。如果错误仍然存在，那么这可以为您解决问题
