角度错误突然出现错误:NodeInjector:NOT_FOUND [ControlContainer] [英] Getting error suddenly in Angular Error: NodeInjector: NOT_FOUND [ControlContainer]
问题描述
core.js:5873错误错误:NodeInjector:NOT_FOUND [ControlContainer]. 有时,当我重新启动项目时,它可以完美运行. app.component.html中只有更改:
core.js:5873 ERROR Error: NodeInjector: NOT_FOUND [ControlContainer]. Sometime when i restart the project it runs perfectly. there are only changes in app.component.html :
<div class="container">
<div class="row">
<div class="col-md-4">
<form action="">
<div class="form-group">
<label for="">Username</label>
<input type="text" name="username" class="form-control" />
</div>
<div class="form-group">
<label>Password</label>
<input type="password" class="form-control">
</div>
<div class="form-group">
<label>Confirm Password</label>
<input type="password" class="form-control">
</div>
<div>
<button type="submit" class="btn btn-primary btn-block">Register</button>
</div>
</form>
</div>
</div>
</div>
推荐答案
在app.module.ts
中,在imports
部分中添加ReactiveFormsModule
.请记住将其导入为顶部的import { ReactiveFormsModule} from '@angular/forms
.
In app.module.ts
I add ReactiveFormsModule
in my imports
section. Remember to import it at the top as: import { ReactiveFormsModule} from '@angular/forms
.
在您的app.component.ts
中,您必须定义FormGroup
实例并通过ngOnInit
方法对其进行初始化/注册,如下所示:
In your app.component.ts
you have to define FormGroup
instance and initialize/register it via ngOnInit
method as below:
import { FormGroup, FormControl } from '@angular/forms'; //imports
.......................................................................
myForm:FormGroup;
ngOnInit(){
this.myForm = new FormGroup({
'name':new FormControl(null), //note, can have up to 3 Constructor Params: default value, validators, AsyncValidators
'email':new FormControl(null,Validators.email)
})
}
然后将表单绑定到FormGroup
实例myForm
:
Then bind form to the FormGroup
instance myForm
:
<form [formGroup]="myForm">
请注意,name
和email
是需要使用formControlName
绑定的形式的控件:
Note that name
and email
are controls in the form that needs binding using formControlName
:
<input type="text" name="name" formControlName="name">
这篇关于角度错误突然出现错误:NodeInjector:NOT_FOUND [ControlContainer]的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!