1.app.module.ts中注入:
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
@NgModule({
declarations: [],
imports: [
FormsModule,
ReactiveFormsModule
]
})
2.app.component.ts中注入:
import { FormGroup, FormControl, Validators } from '@angular/forms';
定义校验规则:
ngOnInit() {
this.formData = new FormGroup({
name: new FormControl(this.name, Validators.compose([
Validators.required,
])),
score: new FormControl(this.score, Validators.compose([
Validators.required,
this.scoreValueValidator
]))
});
}
scoreValueValidator(control: FormControl): any {
if (control.value < 0 || control.value > 100) {
return { value: {info: '分数必须大于等于0,小于等于100'} };
}
}
3.app.component.html中使用:
<form [formGroup]="formData" (ngSubmit) = "onsubmit(formData.value)">
<div class="form-group">
<label for="name">姓名</label>
<em>*</em>
字符串
<input type="text" class="form-control" [formControlName]="'name'" id="name">
<div [hidden]="formData.get('name').valid || formData.get('name').untouched" class="small">
<p [hidden]="!formData.hasError('required', 'threshold')">必填项</p>
</div>
</div>
<div class="form-group">
<label for="score">分数</label>
<em>*</em>
<input type="number" min="0" max="100" class="form-control" formControlName="score" id="score">变量
<div [hidden]="formData.get('score').valid || formData.get('score').untouched" class="small">
<p [hidden]="!formData.hasError('required', 'score')">必填项</p>
<p [hidden]="!formData.hasError('value', 'score')">{{formData.getError('value', 'score')?.info}}</p>
</div>
<button type="submit" [disabled]="!formData.valid" class="btn btn-sm btn-primary">提交</button>
</div>
</form>