带有选择框的 angular 6 中的 ngForm 简单示例

本文介绍了带有选择框的 angular 6 中的 ngForm 简单示例的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

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Angular 6 表单验证简单示例.使用电子邮件验证和选择框(下拉).ngForm 带有选择框的 angular 6 简单示例

解决方案

使用 ngForm.导入你的 component.module.ts(module file)

import { FormsModule } from '@angular/forms';

将其添加到您的组件模板

<select name="name_id" [(ngModel)]="model.name_id" #name_id="ngModel" [ngClass]="{'is-invalid': f.submitted && name_id.invalid }" required><option value="" disabled selected>选择名称</option><option *ngFor="let name of allnames" [value]="name.name_id">{{name.name}}</option></选择><div *ngIf="f.submitted && name_id.invalid" class="invalid-feedback"><div *ngIf="name_id.errors.required">姓名为必填项</div>
<input type="email" placeholder="Email" name="email" [(ngModel)]="recoverModel.email" #email="ngModel" pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$" [ngClass]="{'is-invalid':recoverForm.submitted &&email.invalid }" 需要/><div *ngIf="recoverForm.submitted && email.invalid" class="invalid-feedback"><div *ngIf="email.errors.required">电子邮件是必需的</div><div *ngIf="email.errors.pattern">电子邮件无效</div>
<button type="submit">save</button></表单>

添加你的component.ts

allnames = [{name_id: 1,姓名:'约翰'}, {name_id: 2,名称:'陈娜'}, {name_id: 3,名称:'杰克'}]模型:任何={}；ngOnInit() {this.model.name_id = 2;}

在选择框中选择了名称 Chena 并且电子邮件有效.它工作得很好.我会用的.

Angular 6 form validation simple example. With email validation and select box(drop down).ngForm simple example in angular 6 with select box

解决方案

Use ngForm. Import it your component.module.ts(module file)

import { FormsModule } from '@angular/forms';

Add it your component template

<form role="form" (ngSubmit)="f.form.valid && onSubmit()" #f="ngForm" novalidate>
    <select name="name_id" [(ngModel)]="model.name_id" #name_id="ngModel" [ngClass]="{ 'is-invalid': f.submitted && name_id.invalid }" required>
        <option value="" disabled selected>Select Name</option>
        <option *ngFor="let name of allnames" [value]="name.name_id">{{name.name}}</option>
    </select>
    <div *ngIf="f.submitted && name_id.invalid" class="invalid-feedback">
        <div *ngIf="name_id.errors.required">Name is required</div>
    </div>
    <input type="email" placeholder="Email" name="email" [(ngModel)]="recoverModel.email" #email="ngModel" pattern="^\w+([\.-]?\w+)*@\w+([\.-]?\w+)*(\.\w{2,3})+$" [ngClass]="{ 'is-invalid': recoverForm.submitted && email.invalid }" required />
    <div *ngIf="recoverForm.submitted && email.invalid" class="invalid-feedback">
        <div *ngIf="email.errors.required">Email is required</div>
        <div *ngIf="email.errors.pattern">Email is invalid</div>
    </div>
    <button type="submit">save</button>
</form>

Add it your component.ts

allnames = [{
    name_id: 1,
    name: 'Jhon'
}, {
    name_id: 2,
    name: 'Chena'
}, {
    name_id: 3,
    name: 'Jack'
}]
model: any = {};
ngOnInit() {
    this.model.name_id = 2;
}

The name Chena is selected in select box and email valid. It's work well. And i will use it.

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