我正在尝试检查表单是否有效，如果无效则阻止进一步执行.
这是我的表格:
<div [隐藏]="firstName.valid"><div *ngIf="firstName?.errors?.minlength" class="control-label">{{'FIRST_NAME_FORM.MIN_LENGTH'|翻译}}
<div class="form-group"><button type="submit" class="btn btn-primary pull-right" [disabled]="buttonDisabled">{{'FIRST_NAME_FORM.SUBMIT'|翻译}}<a [routerLink]="['/dashboard/useraccount']" class="btn btn-link pull-right text-right">{{'FORM_CANCEL' |翻译}}</a>
</表单>
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 true...
updateFirstName(firstNameForm) {console.log(firstNameForm);//firstNameForm 的有效属性为真...}谁能告诉我为什么会这样?
您正在做模板驱动的表单.请参考这个简单的plunk
员工表格
<form #personForm="ngForm" (submit)="personFormSubmit(personForm)" novalidate><div><div><input id="nameInput" type="text" name="name"ngControl =名称"必需的最小长度=2"最大长度=35"[(ngModel)]="person.name"/><div><button type="submit">提交</button>
<div style="color: red">{{validationMessage}}</div></表单>
然后是控制器:
import { Component } from '@angular/core';导入 { FORM_DIRECTIVES, ControlGroup, Control, Validators, FormBuilder, Validator, } from '@angular/common';导入 'rxjs/Rx';导出类人{身份证号码;名称:字符串；}@成分({选择器:'我的应用'，指令:[FORM_DIRECIVES]，templateUrl: 'app/app.component.html'})导出类 AppComponent {人:人；验证消息:字符串；构造函数(){this.person = new Person();this.validationMessage = "";}personFormSubmit(personForm: ControlGroup) {如果(personForm.valid){this.validationMessage = "表单有效";}别的{this.validationMessage = "表单无效";}}}如果您想转向更复杂的动态验证，那么最好转换为模型驱动的表单.就像这个 plunk
I am trying to check whether a form is valid or not to prevent further execution if it is not.
Here is my form:
<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>
However, when I submit an invalid form, I notice in the console that the valid attribute of NgForm is true...
updateFirstName(firstNameForm) {
console.log(firstNameForm);//the valid attribute of firstNameForm is true...
}
Can anyone please let me know why this is the case?
You are doing template driven forms. Please refer to this simple plunk
<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>
and then the controller:
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";
}
}
}
If you want to move to more complex dynamic validation then it would be better to convert to Model driven Forms. As with this plunk
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