Angular 角度2-表单验证失败
我有这样的表格Angular 角度2-表单验证失败,angular,Angular,我有这样的表格 import { FormControl, FormGroup, Validators } from '@angular/forms'; @Component({ template: ` <form [formGroup]="formGroup" (ngSubmit)="onSubmit()" novalidate> <textarea (keyup)="valuechange($event)" #input n
import { FormControl, FormGroup, Validators } from '@angular/forms';
@Component({
template: `
<form [formGroup]="formGroup" (ngSubmit)="onSubmit()" novalidate>
<textarea (keyup)="valuechange($event)" #input name="detail" id="detail" formControlName="detail"></textarea>
<div *ngIf="formGroup.controls['detail'].dirty && formGroup.controls['detail'].invalid">This is required</div>
<button type="submit">Post</button>
</form>
`,
})
export class CreateDiscussionComponent implements OnInit, AfterViewInit {
constructor(
) {
this.formGroup = new FormGroup({
detail: new FormControl('', [Validators.required, Validators.minLength(2) ]),
});
}
onSubmit(): void {
this.submitted = true;
console.log(this.formGroup.value)
}
}
从'@angular/forms'导入{FormControl,FormGroup,Validators};
@组成部分({
模板:`
这是必需的
邮递
`,
})
导出类CreateDiscussionComponent实现OnInit,AfterViewInit{
建造师(
) {
this.formGroup=新的formGroup({
详细信息:新表单控件(“”,[Validators.required,Validators.minLength(2)]),
});
}
onSubmit():void{
this.submitted=true;
console.log(this.formGroup.value)
}
}
它只有一个文本区域。它所做的是,如果输入不是临时的,请在单击“提交”时提交
问题:即使文本区域为空,表单也将提交。您可以将
禁用属性添加到元素中
<button type="submit" [disabled]="!formGroup.valid" >Post</button>
您可以将表单实例传递给onSubmit(),然后检查表单是否有效
(ngSubmit)="formGroup.valid && onSubmit()"
HTML:
打字稿:
onSubmit(form) {
if(form.invalid){
return;
}
this.submitted = true;
console.log(this.formGroup.value)
}
我尝试了disabled
attr,它在控制台中给出了一个黄色警告,表示disabled不应与被动形式一起使用。在提交空值后显示错误消息如何?
onSubmit(form) {
if(form.invalid){
return;
}
this.submitted = true;
console.log(this.formGroup.value)
}