我试图检查表单是否有效,以防止进一步执行,如果不是.
这是我的表格：
<form (ngSubmit)="updateFirstName(firstNameForm)" #firstNameForm="ngForm" novalidate>
<div class="form-group" ng-class="getCssClasses(formCtrl,formCtrl.firstName)">
<div class="input-group">
<input type="text"
ngControl="firstName"
#firstName="ngForm"
required
minlength="2"
maxlength="35"
pattern_="FIRST_NAME_PATTERN"
[ngModel]="currentUserAccount?.firstName"
(ngModelChange)="currentUserAccount ? currentUserAccount.firstName = $event : null"
placeholder="{{'FIRST_NAME_FORM.NEW_FIRST_NAME'| translate }}"
class="form-control"/>
</div>
<div [hidden]="firstName.valid">
<div *ngIf="firstName?.errors?.minlength" class="control-label">{{'FIRST_NAME_FORM.MIN_LENGTH'| translate}}</div>
</div>
</div>
<div class="form-group">
<button type="submit" class="btn btn-primary pull-right" [disabled]="buttonDisabled">{{'FIRST_NAME_FORM.SUBMIT'| translate}}</button>
<a [routerLink]="['/dashboard/useraccount']" class="btn btn-link pull-right text-right">{{'FORM_CANCEL' | translate}}</a>
</div>
</form>
但是,当我提交无效表单时,我在控制台中注意到NgForm的有效属性是真的……
updateFirstName(firstNameForm) {
console.log(firstNameForm);//the valid attribute of firstNameForm is true...
}
任何人都可以让我知道为什么会这样吗？
你正在做模板驱动的表格.请参考这个简单的
plunk
原文链接：/angularjs/141705.html<h1>Employee Form</h1>
<form #personForm="ngForm" (submit)="personFormSubmit(personForm)" novalidate>
<div>
<div>
<input id="nameInput" type="text" name="name"
ngControl="name"
required
minlength="2"
maxlength="35"
[(ngModel)]="person.name" />
</div>
</div>
<div>
<button type="submit">Submit</button>
</div>
<div style="color: red">{{validationMessage}}</div>
</form>
然后是控制器：
import { Component } from '@angular/core';
import { FORM_DIRECTIVES,ControlGroup,Control,Validators,FormBuilder,Validator,} from '@angular/common';
import 'rxjs/Rx';
export class Person {
id: number;
name: string;
}
@Component({
selector: 'my-app',directives: [FORM_DIRECTIVES],templateUrl: 'app/app.component.html'
})
export class AppComponent {
person: Person;
validationMessage: string;
constructor() {
this.person = new Person();
this.validationMessage = "";
}
personFormSubmit(personForm: ControlGroup) {
if (personForm.valid) {
this.validationMessage = "Form Is Valid";
}
else
{
this.validationMessage = "Form Is Not Valid";
}
}
}
如果您想转向更复杂的动态验证,那么转换为模型驱动的表单会更好.与此plunk一样
