最近在使用ng2做前端。发现表单验证这块除了官网上给的示例，验证required。其他的都要自己写逻辑来实现。开发起来不是很方便。所以在网上找了下ng2表单验证的资源，觉得ng2-validation不错。所以做的例子。以便以后使用，也怕时间久了忘脑后去。
示例代码链接
首先从npm包管理服务器上下载安装。
npm install ng2-validation --save 命令参数--save：使npm包信息保存在package.json文件的dependencies配置集合内。该集合是ng2正式运行的依赖集合。
使用方法
在模块文件内添加引用，一般为AppModule。
app.module.ts文件
import { NgModule } from '@angular/core';import { BrowserModule } from '@angular/platform-browser';import { FormsModule,ReactiveFormsModule } from '@angular/forms';import { CustomFormsModule } from 'ng2-validation';import { AppComponent } from './app.component';import { AppTtemplateDrivenComponent } from './app-ttemplate-driven/app-ttemplate-driven.component';import { AppModelDrivenComponent } from './app-model-driven/app-model-driven.component';import { AppRoutingModule } from "app/app-routes.module";import { ValidationConfigModel } from "app/Models/validation";
@NgModule({
declarations: [
AppComponent,
AppTtemplateDrivenComponent,
AppModelDrivenComponent
],
imports: [
BrowserModule,
FormsModule,
AppRoutingModule,
CustomFormsModule,
ReactiveFormsModule
],
providers: [ValidationConfigModel],
bootstrap: [AppComponent]
})
export class AppModule { }
表单验证的使用方式有两种。可以灵活选择。两者混合使用我没研究。其实使用一种就足够了。
模板驱动（template driven）
GitHub上例子
<input type="text" [(ngModel)]="model.field" name="field" #field="ngModel" [rangeLength]="[5, 9]"/> <p *ngIf="field.errors?.rangeLength">error message</p>
<
<span class="pl-ent"><span class="pl-e"><span class="pl-s"><span class="pl-pds"><span class="pl-pds"><span class="pl-e"><span class="pl-s"><span class="pl-pds"><span class="pl-pds"><<span class="pl-ent">p <span style="color: #0000ff;">*</span><span class="pl-e"><span style="color: #0000ff;">ngIf=</span><span class="pl-s"><span class="pl-pds"><span style="color: #0000ff;">"demoForm.from.controls.field.errors?.rangeLength</span><span class="pl-pds"><span style="color: #0000ff;">"</span>>error message</<span class="pl-ent">p><br/></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><span class="pl-k"><span class="pl-k"><span class="pl-en"><span class="pl-k">FormGroup需要在from的dom上添加formGroup驱动，否则验证不生效。<br/></span></span></span></span>
<span class="pl-k"><span class="pl-k"><span class="pl-en"><span class="pl-k"> 下面是我的demo代码片段：<br/>模板驱动app-ttemplate-driven.component.html<br/></span></span></span></span>
<div class="container">
<form (ngSubmit)="onSubmit()" #validationForm="ngForm">
<div class="form-group">
<label for="appField">长度要求</label>
<input type="text" required class="form-control" name="appField" [(ngModel)]="model.appField" #rangeLength="ngModel" [rangeLength]="[5, 9]">
<p [hidden]="rangeLength.valid||rangeLength.pristine">长度在5到9之间</p>
</div>
<div class="form-group">
<label for="appField2">长度要求2</label>
<input type="text" class="form-control" name="appField2" [(ngModel)]="model.appField2" #rangeLength2="ngModel" [rangeLength]="[0,5]">
<p [hidden]="rangeLength2.valid||rangeLength2.pristine">长度要求</p>
</div>
<div class="form-group">
<label for="appMin">最小值</label>
<input type="number" class="form-control" name="appMin" [(ngModel)]="model.appMin" #appMin="ngModel" [min]="10" />
<p [hidden]="appMin.valid||appMin.pristine">取值大于等于10</p>
</div>
<div class="form-group">
<label for="appGt">大于</label>
<input type="number" class="form-control" name="appGt" [(ngModel)]="model.appGt" #appGt="ngModel" [gt]="10" />
<p [hidden]="appGt.valid||appGt.pristine">取值大于10</p>
</div>
<div class="form-group">
<label for="appGte">大于等于</label>
<input type="number" class="form-control" name="appGte" [(ngModel)]="model.appGte" #appGte="ngModel" [gte]="10" />
<p [hidden]="appGte.valid||appGte.pristine">取值大于等于10</p>
</div>
<div class="form-group">
<label for="appMax">最大值</label>
<input type="number" class="form-control" name="appMax" [(ngModel)]="model.appMax" #appMax="ngModel" [max]="10" />
<p [hidden]="appMax.valid||appMax.pristine">最小值10</p>
</div>
<div class="form-group">
<label for="appLt">小于</label>
<input type="number" class="form-control" name="appLt" [(ngModel)]="model.appLt" #appLt="ngModel" [lt]="10" />
<p [hidden]="appLt.valid||appLt.pristine">值小于10</p>
</div>
<div class="form-group">
<label for="appLte">小于等于</label>
<input type="number" class="form-control" name="appLte" [(ngModel)]="model.appLte" #appLte="ngModel" [lte]="10" />
<p [hidden]="appLte.valid||appLte.pristine">值小于等于10</p>
</div>
<div class="form-group">
<label for="appRange">取值范围</label>
<input type="number" class="form-control" name="appRange" [(ngModel)]="model.appRange" #appRange="ngModel" [range]="[10, 20]" />
<p [hidden]="appRange.valid||appRange.pristine">取值大于等于10到小于等于20</p>
</div>
<div class="form-group">
<label for="appDigits">数字</label>
<input type="text" class="form-control" name="appDigits" [(ngModel)]="model.appDigits" #appDigits="ngModel" digits />
<p [hidden]="appDigits.valid||appDigits.pristine">必须是uint</p>
</div>
<div class="form-group">
<label for="appNumber">数字</label>
<input type="text" class="form-control" name="appNumber" [(ngModel)]="model.appNumber" #appNumber="ngModel" number />
<p [hidden]="appNumber.valid||appNumber.pristine">任何数字</p>
</div>
<div class="form-group">
<label for="appUrl">链接</label>
<input type="text" class="form-control" name="appUrl" [(ngModel)]="model.appUrl" #appUrl="ngModel" url />
<p [hidden]="appUrl.valid||appUrl.pristine">合法的url</p>
</div>
<div class="form-group">
<label for="appEmail">邮箱</label>
<input type="text" class="form-control" name="appEmail" [(ngModel)]="model.appEmail" #appEmail="ngModel" email />
<p [hidden]="appEmail.valid||appEmail.pristine">合法的邮箱地址</p>
</div>
<div class="form-group">
<label for="appDate">日期</label>
<input type="text" class="form-control" name="appDate" [(ngModel)]="model.appDate" #appDate="ngModel" date />
<p [hidden]="appDate.valid||appDate.pristine">合法的日期</p>
</div>
<div class="form-group">
<label for="appUuid">uuid</label>
<input type="text" class="form-control" name="appUuid" [(ngModel)]="model.appUuid" #appUuid="ngModel" uuid="'all'" />
<p [hidden]="appUuid.valid||appUuid.pristine">不是合法的uuid</p>
</div>
<div class="form-group">
<label for="appPhone">电话</label>
<input type="text" class="form-control" name="appPhone" [(ngModel)]="model.appPhone" #appPhone="ngModel" phone="CN" />
<p [hidden]="appPhone.valid||appPhone.pristine">不是合法的电话号码</p>
</div>
<div class="form-group">
<label >两次相同</label>
<input class="form-control" type="password" ngModel name="appPassword" #appPassword="ngModel" required/>
<p [hidden]="appPassword.valid||appPassword.pristine">必填项</p>
<input class="form-control" type="password" ngModel name="appCertainPassword" #appCertainPassword="ngModel" [equalTo]="appPassword"/>
<p [hidden]="appCertainPassword.valid||appCertainPassword.pristine">两次输入不一致</p>
</div>
<div class="form-group">
<label for="appEqual">相同</label>
<input type="text" class="form-control" name="appEqual" [(ngModel)]="model.appEqual" #appEqual="ngModel" [equal]="'哈哈'" />
<p [hidden]="appEqual.valid||appEqual.pristine">与值不相符</p>
</div>
<div class="form-group">
<label for="appComplex">复合条件</label>
<input type="number" class="form-control" name="appComplex" [(ngModel)]="model.appComplex" #appComplex="ngModel" [gte]="5" [max]="10" />
<p [hidden]="appComplex.valid||appComplex.pristine">大于等于5，最大是10</p>
</div>
<button type="submit" [disabled]="!validationForm.form.valid" class="btn btn-default">Submit</button>
</form>
</div>
<br/>
ts文件不需要做什么，所以就不贴了。
模型驱动
app-model-driven.component.ts
import { Component, OnInit } from '@angular/core';import { FormGroup, FormControl, Validators } from "@angular/forms";import { CustomValidators } from 'ng2-validation';
@Component({
selector: 'app-app-model-driven',
templateUrl: './app-model-driven.component.html',
styleUrls: ['./app-model-driven.component.css']
})
export class AppModelDrivenComponent implements OnInit {public formGroup: FormGroup;
password:string="";
constructor() {
let password = new FormControl('', [Validators.required]);
let certainPassword = new FormControl('', CustomValidators.equalTo(password));this.formGroup = new FormGroup({
field: new FormControl('', CustomValidators.rangeLength([5, 9])),
appGt:new FormControl('', CustomValidators.gt(10)),
password:password,
certainPassword:certainPassword,
maxField:new FormControl('',[CustomValidators.gt(10),CustomValidators.max(20)])
});
}
ngOnInit() {
}
onSubmit(){}
}app-model-driven.component.html
<div class="container">
<form [formGroup]="formGroup" (ngSubmit)="onSubmit()" #validationForm2="ngForm" >
<div class="form-group" >
<input class="form-control" name="field" type="text" formControlName="field"/>
<p *ngIf="validationForm2.form.controls.field.errors?.rangeLength">长度在5到9之间</p>
<p>{{validationForm2.form.controls.field.errors?.rangeLength}}</p>
</div>
<div class="form-group" >
<input class="form-control" name="appGt" type="number" formControlName="appGt"/>
<p *ngIf="validationForm2.form.controls.appGt.errors?.gt">大于10</p>
</div>
<div class="form-group" >
<input class="form-control" name="password" type="password" [(ngModel)]="password" formControlName="password"/>
<p *ngIf="validationForm2.form.controls.password.errors?.required">必填</p>
<p>{{test.pristine}}</p>
<input class="form-control" type="password" formControlName="certainPassword"/>
<p *ngIf="validationForm2.form.controls.certainPassword.errors?.equalTo">两次相同</p>
</div>
<div class="form-group" >
<label for="appMin">组合形式</label>
<input type="number" class="form-control" name="appMin" formControlName="maxField" />
<p [hidden]="!validationForm2.form.controls.maxField.errors?.max &&!validationForm2.form.controls.maxField.errors?.gt">取值大于等于10且小于20</p>
</div>
<button type="submit" [disabled]="!validationForm2.form.valid" class="btn btn-default">Submit</button>
</form>
</div>
<br/>
<br/>
以上就是angular2之ng2-validation学习的详细内容，更多请关注php中文网其它相关文章！
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