angularjs – 未调用自定义验证程序

无法让Angular 2自定义验证器使用
来自食谱的方法.

我的主要目标是学习Angular(也就是说,我是一个菜鸟,因为
总是).

我正在尝试一个只允许整数的文本输入字段
一定范围(1-26).我以为我会变聪明并写一个验证器
采用任意数字和范围列表(例如,
“1,3,5,7,11-19,100-200”),并检查给定值是否为
其中一个允许的值.

我的问题是自定义验证器(匿名函数
从不被调用的allowednumericValuesValidator返回？)
(但请注意,构建的必需验证器运行正常.)对于
那个问题,也没有任何定义的方法
调用AllowednumericValuesDirective.验证器来源
代码本身会被加载,但这就是事情的进展.

使用Angular 2.2.3,angular-cli 1.0.0-beta.22-1.
浏览器是Chrome 55.0.2883.95(64位)

来源是https://github.com/JohnL4/Diaspora,但我会尽力
相关部分在这里.

这就是我所做的：

我的验证器看起来像这样：

import { Directive,Input,OnChanges,SimpleChanges } from '@angular/core';
import { AbstractControl,NG_VALIDATORS,Validator,ValidatorFn,Validators } from '@angular/forms';

const SELECTOR: string = 'allowednumericValues'; // <---------------- breakpoint here

class Range
{
   constructor ( public Low: number,public High: number) {}
}

export function allowednumericValuesValidator( anAllowedValuesspec: string): ValidatorFn
{
   let errors: string[] = [];   // (<---- breakpoint here) Errors from parsing allowed values specification
   let ranges : Range[] = [];   // Allowed ranges,used in validation.
   let rangeSpecs = anAllowedValuesspec.split( /\s*,\s*/);
   for (let r of rangeSpecs)
   {
      let ends : string[] = r.split( /\s*-\s*/);
      if (ends.length == 1)
      {
         let end : number = Number(ends[0]);
         if (isNaN( end))
            errors.push( r + " is NaN");
         else
            ranges.push( new Range( end,end));
      }
      else if (ends.length == 2)
      {
         let low:number = Number(ends[0]);
         let high:number = Number(ends[1]);
         if (isNaN( low) || isNaN( high))
            errors.push( r + " has NaN");
         else
            ranges.push( new Range( low,high));
      }
      else
         errors.push( r + " has bad Syntax");
   }
   if (errors.length > 0)
      throw new Error( errors.join( "; "));

   return (control: AbstractControl): {[key: string]: any} => {
      const numberToBeValidated = control.value; // <---------------- breakpoint here
      const num = Number( numberToBeValidated);
      if (isNaN( num))
         return {SELECTOR: {numberToBeValidated}};
      let isGood: boolean = false;
      for (let r of ranges)
      {
         if (r.Low <= num && num <= r.High)
         {
            isGood = true;
            break;
         }
      }
      return isGood ? null : {SELECTOR: {numberToBeValidated}};
   };
}

@Directive({
   selector: '[' + SELECTOR + ']',// Note: not using extra '[ngForm]' or '[ngModel]' here because the cookbook example doesn't.
   providers: [{provide: NG_VALIDATORS,useExisting: AllowednumericValuesDirective,multi: true}]
})
export class AllowednumericValuesDirective implements Validator,OnChanges
{
   @input() allowednumericValues: string;
   private valFn = Validators.nullValidator; // <---------------- breakpoint here

   ngOnChanges( changes: SimpleChanges): void
   {
      const change = changes[ SELECTOR];
      if (change)
      {
         const val: string = change.currentValue;
         this.valFn = allowednumericValuesValidator( val);
      }
      else
         this.valFn = Validators.nullValidator;
   }

   validate( control: AbstractControl): {[key: string]: any}
   {
      return this.valFn( control);
   }
}

如果我在const SELECTOR赋值上放置一个断点,它就会被击中
(callstack大约有6个__webpack_require__来电),但是
之后没有任何东西被调用(没有其他断点被击中,
我也没有调用任何console.log()语句.

我的shared.module.ts,在同一个共享目录中
验证器,看起来像这样：

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { SharedComponent } from './shared.component'; // angular-cli stuck this in here; I'm not sure I need it.
import { AllowednumericValuesDirective } from './allowed-numeric-values.directive';

@NgModule({
  imports: [
    CommonModule
  ],declarations: [SharedComponent,AllowednumericValuesDirective]
})
export class SharedModule { }

我的app.module.ts看起来像这样(我有4个组件,但我只是
关注“params”一个,其他三个工作正常)：

import { browserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { RouterModule }   from '@angular/router';

import { SharedModule } from './shared/shared.module'; 
import { AppComponent } from './app.component';
import { ClusterDetailsComponent } from './cluster-details/cluster-details.component';
import { DotComponent } from './dot/dot.component';
import { GeneratorParamsComponent } from './generator-params/generator-params.component';
import { TabsComponent } from './tabs/tabs.component';
import { XmlComponent } from './xml/xml.component';

@NgModule({
   declarations: [
      AppComponent,ClusterDetailsComponent,DotComponent,GeneratorParamsComponent,TabsComponent,XmlComponent
   ],imports: [
      browserModule,FormsModule,HttpModule,SharedModule,// I don't need to put the validator in the `declarations` property above,do I?
      RouterModule.forRoot([
         {
            path: '',// Initial load.
            redirectTo: '/params',pathMatch: 'full'
         },{
            path: 'params',component: GeneratorParamsComponent
         },{
            path: 'details',component: ClusterDetailsComponent
         },{
            path: 'xml',component: XmlComponent
         },{
            path: 'dot',component: DotComponent
         }
      ])
   ],providers: [],bootstrap: [AppComponent]
})
export class AppModule { }

generator-params.component.html看起来像这样：

<p></p>

<form #parmsForm="ngForm" class="form-horizontal">  <!-- "form-horizontal" is Bootstrap class -->
  <div class="form-group">                           <!-- "form-group" is Bootstrap class -->
    <label for="numSystems" class="col-sm-3 control-label"> <!-- "control-label" is the class for labels in HORIZONTAL forms. -->
      Number of systems in cluster
    </label>
    <div class="col-sm-2">
      <input id="numSystems" name="numSystems" type="text" class="form-control"
             required maxlength="2" allowednumericValues="1-26"
             [(ngModel)]="numSystems">
    </div>
    <div *ngIf="formErrors.numSystems" class="col-sm-6 alert alert-danger">
      {{ formErrors.numSystems }}
    </div>
  </div>
  <div class="form-group">
    <div class="col-sm-offset-3 col-sm-9">
      <div class="checkBox">    <!-- "checkBox" is Bootstrap class -->
        <label for="slipstreamsHighLow">
          <input id="slipstreamsHighLow" name="slipstreamsHighLow" type="checkBox" />
          Slipstreams Differentiated Between High & Low Slipknots
        </label>
      </div>
  </div></div>
  <div class="form-group">
    <div class="col-sm-offset-3 col-sm-9">
    <button id="goBtn" (click)="generateCluster()" class="btn btn-default btn-warning"
            title="ObvIoUsly,this will hammer your existing cluster. Be sure you have it backed up or otherwise saved,or that you don't care."
            >
      Go!
    </button>
    <button id="revertBtn" class="btn btn-default" (click)="revertParams()">Revert</button>
    </div>
  </div>
</form>

最后,generator-params.component.ts看起来像这样：

import { Component,OnInit,ViewChild } from '@angular/core';
import { FormsModule,NgForm } from '@angular/forms';

import { Cluster } from '../cluster';

@Component({
  selector: 'app-generator-params',templateUrl: './generator-params.component.html',styleUrls: ['./generator-params.component.css']
})
export class GeneratorParamsComponent implements OnInit {

   private numSystems: string; // = "6";
//   get numSystems() : string { return this._numSystems; }
//   set numSystems( value: string) { this._numSystems = value; }

   parmsForm: NgForm;
   @ViewChild( 'parmsForm') currentForm: NgForm;

   formErrors = {
      'numSystems': ''
   };

   validationMessages = {
      'numSystems': {
         'required': "A number of systems is required",'allowednumericValues': "Value must be one of the allowed numeric values"
      }
   };

   private _cluster: Cluster;

   constructor(aCluster: Cluster)
   {
      this._cluster = aCluster;
      if (aCluster && aCluster.numSystems)
         this.numSystems = aCluster.numSystems.toString();
      // this.strSystems = this.numSystems.toString();
      // this.numSystems = "6"; // aCluster.numSystems.toString();
   }

   ngOnInit()
   {
   }

   /** See form validation cookbook "recipe"
    */
   ngAfterViewChecked()
   {
      this.formChanged();
   }

   public generateCluster()
   {
      // this._cluster = new Cluster( this.numSystems); // Don't new up,just update in place?
      this._cluster.numSystems = Number( this.numSystems);
      // this.cluster.generateSystems();
   }

   public revertParams()
   {
      this.numSystems = this._cluster.numSystems.toString();
   }

   formChanged()
   {
      if (this.currentForm === this.parmsForm) return;
      this.parmsForm = this.currentForm;
      if (this.parmsForm)
         this.parmsForm.valueChanges.subscribe( data => this.onValueChanged( data));
   }

   onValueChanged( data?: any)
   {
      if (!this.parmsForm) return;
      const form = this.parmsForm.form;

      for (const field in this.formErrors)
      {
         this.formErrors[field] = '';
         const control = form.get( field);
         if (control && control.dirty && !control.valid)
         {
            const messages = this.validationMessages[field];
            for (const key in control.errors)
            {
               this.formErrors[field] += messages[key] + ' ';
            }
         }
      }
   }
}

我想我已经根据食谱正确地搞定了一切,但是
显然我错过了一些东西,因为自定义验证器不是
射击.

谁能告诉我我错过了什么？

谢谢.

解决方法

您在模块中声明要与其他模块共享的所有组件,管道,指令,还需要将它们添加到导出中

@NgModule({
  declarations: [ MyDirective ],exports: [ MyDirective ]
})
export class SharedModule {}