angular-reactive-validation
Version:
Reactive Forms validation shouldn't require the developer to write lots of HTML to show validation messages. This library makes it easy.
141 lines • 23.3 kB
JavaScript
import { Component, ContentChildren, Input, ViewEncapsulation, Optional, Inject } from '@angular/core';
import { Subscription } from 'rxjs';
import { ValidationMessageComponent } from '../validation-message/validation-message.component';
import { ValidationError } from '../validation-error';
import { getFormControlFromContainer, isControlContainerVoidOrInitialized } from '../get-form-control-from-container';
import { REACTIVE_VALIDATION_MODULE_CONFIGURATION_TOKEN } from '../reactive-validation-module-configuration-token';
import { getControlPath } from '../get-control-path';
import * as i0 from "@angular/core";
import * as i1 from "@angular/forms";
import * as i2 from "../form/form.directive";
import * as i3 from "@angular/common";
/**
* The ValidationMessagesComponent shows validation messages for one to many FormControls. It either shows
* messages specified within the reactive form model, or shows custom messages declared using the
* ValidationMessageComponent.
*/
export class ValidationMessagesComponent {
constructor(controlContainer, formSubmitDirective, configuration) {
this.controlContainer = controlContainer;
this.configuration = configuration;
this._for = [];
this.messageComponentsChangesSubscription = new Subscription();
this.controlStatusChangesSubscription = new Subscription();
this.formSubmitted = undefined;
this.formSubmittedSubscription = new Subscription();
this.initializeForOnInit = () => { };
if (formSubmitDirective) {
this.formSubmitted = false;
this.formSubmittedSubscription.add(formSubmitDirective.submitted.subscribe(() => {
this.formSubmitted = true;
}));
}
}
ngOnInit() {
this.initializeForOnInit();
}
ngAfterContentInit() {
this.messageComponentsChangesSubscription.add(this.messageComponents?.changes.subscribe(this.validateChildren));
this.validateChildren();
this._for.forEach(control => {
this.handleControlStatusChange(control);
});
}
ngOnDestroy() {
this.messageComponentsChangesSubscription.unsubscribe();
this.formSubmittedSubscription.unsubscribe();
this.controlStatusChangesSubscription.unsubscribe();
}
isValid() {
return this.getFirstErrorPerControl().length === 0;
}
getErrorMessages() {
return this.getFirstErrorPerControl().filter(error => error.hasMessage())
.map(error => error.getMessage());
}
set for(controls) {
if (!isControlContainerVoidOrInitialized(this.controlContainer)) {
this.initializeForOnInit = () => this.for = controls;
return;
}
if (!Array.isArray(controls)) {
controls = controls !== undefined ? [controls] : [];
}
if (controls.length === 0) {
throw new Error(`arv-validation-messages doesn't allow declaring an empty array as input to the 'for' attribute.`);
}
this._for = controls.map(control => typeof control === 'string' ?
getFormControlFromContainer(control, this.controlContainer) : control);
this.validateChildren();
this.controlStatusChangesSubscription.unsubscribe();
this.controlStatusChangesSubscription = new Subscription();
this._for.forEach(control => {
this.controlStatusChangesSubscription.add(control.statusChanges.subscribe(() => {
this.handleControlStatusChange(control);
}));
});
}
getFirstErrorPerControl() {
return this._for.filter(control => this.configuration && this.configuration.displayValidationMessageWhen ?
this.configuration.displayValidationMessageWhen(control, this.formSubmitted) : control.touched || this.formSubmitted).map(ValidationError.fromFirstError).filter(value => value !== undefined);
}
/**
* Validates that the child ValidationMessageComponents declare what FormControl they specify a message for (when needed); and
* that the declared FormControl is actually part of the parent ValidationMessagesComponent 'for' collection (when specified).
*/
validateChildren() {
if (!this.messageComponents) {
return;
}
this.messageComponents.forEach(component => {
if (this._for.length > 1 && component.for === undefined) {
throw new Error(`Specify the FormControl for which the arv-validation-message element with key '${component.key}' ` +
`should show messages.`);
}
if (component.for && this._for.indexOf(component.for) === -1) {
throw new Error(`A arv-validation-messages element with key '${component.key}' attempts to show messages ` +
`for a FormControl that is not declared in the parent arv-validation-messages element.`);
}
});
}
handleControlStatusChange(control) {
if (!this.messageComponents) {
return;
}
this.messageComponents.filter(component => component.for === control || component.for === undefined)
.forEach(component => component.reset());
const error = ValidationError.fromFirstError(control);
if (!error || error.hasMessage()) {
return;
}
const messageComponent = this.messageComponents.find(component => component.canHandle(error));
if (messageComponent) {
messageComponent.show(error);
}
else {
throw new Error(`There is no suitable arv-validation-message element to show the '${error.key}' ` +
`error of '${getControlPath(error.control)}'`);
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.1.2", ngImport: i0, type: ValidationMessagesComponent, deps: [{ token: i1.ControlContainer, optional: true }, { token: i2.FormDirective, optional: true }, { token: REACTIVE_VALIDATION_MODULE_CONFIGURATION_TOKEN, optional: true }], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "18.1.2", type: ValidationMessagesComponent, selector: "arv-validation-messages", inputs: { for: "for" }, queries: [{ propertyName: "messageComponents", predicate: ValidationMessageComponent }], ngImport: i0, template: "<div *ngIf=\"!isValid()\">\n <div class=\"invalid-feedback\">\n <p *ngFor=\"let message of getErrorMessages()\">{{message}}</p>\n </div>\n <ng-content></ng-content>\n</div>\n", dependencies: [{ kind: "directive", type: i3.NgForOf, selector: "[ngFor][ngForOf]", inputs: ["ngForOf", "ngForTrackBy", "ngForTemplate"] }, { kind: "directive", type: i3.NgIf, selector: "[ngIf]", inputs: ["ngIf", "ngIfThen", "ngIfElse"] }], encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.1.2", ngImport: i0, type: ValidationMessagesComponent, decorators: [{
type: Component,
args: [{ selector: 'arv-validation-messages', encapsulation: ViewEncapsulation.None, template: "<div *ngIf=\"!isValid()\">\n <div class=\"invalid-feedback\">\n <p *ngFor=\"let message of getErrorMessages()\">{{message}}</p>\n </div>\n <ng-content></ng-content>\n</div>\n" }]
}], ctorParameters: () => [{ type: i1.ControlContainer, decorators: [{
type: Optional
}] }, { type: i2.FormDirective, decorators: [{
type: Optional
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [REACTIVE_VALIDATION_MODULE_CONFIGURATION_TOKEN]
}] }], propDecorators: { messageComponents: [{
type: ContentChildren,
args: [ValidationMessageComponent]
}], for: [{
type: Input
}] } });
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{ Component, ContentChildren, QueryList, Input, ViewEncapsulation, AfterContentInit,\n  OnDestroy, Optional, Inject, OnInit } from '@angular/core';\nimport { UntypedFormControl, ControlContainer } from '@angular/forms';\nimport { Subscription } from 'rxjs';\n\nimport { ValidationMessageComponent } from '../validation-message/validation-message.component';\nimport { ValidationError } from '../validation-error';\nimport { getFormControlFromContainer, isControlContainerVoidOrInitialized } from '../get-form-control-from-container';\nimport { FormDirective } from '../form/form.directive';\nimport { ReactiveValidationModuleConfiguration } from '../reactive-validation-module-configuration';\nimport { REACTIVE_VALIDATION_MODULE_CONFIGURATION_TOKEN } from '../reactive-validation-module-configuration-token';\nimport { getControlPath } from '../get-control-path';\n\n@Component({\n  selector: 'arv-validation-messages',\n  templateUrl: './validation-messages.component.html',\n  encapsulation: ViewEncapsulation.None\n})\n/**\n * The ValidationMessagesComponent shows validation messages for one to many FormControls. It either shows\n * messages specified within the reactive form model, or shows custom messages declared using the\n * ValidationMessageComponent.\n */\nexport class ValidationMessagesComponent implements AfterContentInit, OnDestroy, OnInit {\n  @ContentChildren(ValidationMessageComponent) private messageComponents: QueryList<ValidationMessageComponent> | undefined;\n\n  private _for: UntypedFormControl[] = [];\n  private messageComponentsChangesSubscription = new Subscription();\n  private controlStatusChangesSubscription = new Subscription();\n\n  private formSubmitted: boolean | undefined = undefined;\n  private formSubmittedSubscription = new Subscription();\n\n  constructor(@Optional() private controlContainer: ControlContainer, @Optional() formSubmitDirective: FormDirective,\n    @Optional() @Inject(REACTIVE_VALIDATION_MODULE_CONFIGURATION_TOKEN) private configuration: ReactiveValidationModuleConfiguration) {\n      if (formSubmitDirective) {\n        this.formSubmitted = false;\n        this.formSubmittedSubscription.add(formSubmitDirective.submitted.subscribe(() => {\n          this.formSubmitted = true;\n        }));\n      }\n  }\n\n  ngOnInit() {\n    this.initializeForOnInit();\n  }\n\n  ngAfterContentInit() {\n    this.messageComponentsChangesSubscription.add(this.messageComponents?.changes.subscribe(this.validateChildren));\n    this.validateChildren();\n\n    this._for.forEach(control => {\n      this.handleControlStatusChange(control);\n    });\n  }\n\n  ngOnDestroy() {\n    this.messageComponentsChangesSubscription.unsubscribe();\n    this.formSubmittedSubscription.unsubscribe();\n    this.controlStatusChangesSubscription.unsubscribe();\n  }\n\n  isValid(): boolean {\n    return this.getFirstErrorPerControl().length === 0;\n  }\n\n  getErrorMessages(): string[] {\n    return this.getFirstErrorPerControl().filter(error => error.hasMessage())\n      .map(error => error.getMessage());\n  }\n\n  private initializeForOnInit = () => {};\n\n  @Input()\n  set for(controls: UntypedFormControl | (UntypedFormControl|string)[] | string) {\n    if (!isControlContainerVoidOrInitialized(this.controlContainer)) {\n      this.initializeForOnInit = () => this.for = controls;\n      return;\n    }\n\n    if (!Array.isArray(controls)) {\n      controls = controls !== undefined ? [controls] : [];\n    }\n\n    if (controls.length === 0) {\n      throw new Error(`arv-validation-messages doesn't allow declaring an empty array as input to the 'for' attribute.`);\n    }\n\n    this._for = controls.map(control => typeof control === 'string' ?\n      getFormControlFromContainer(control, this.controlContainer) : control);\n\n    this.validateChildren();\n\n    this.controlStatusChangesSubscription.unsubscribe();\n    this.controlStatusChangesSubscription = new Subscription();\n    this._for.forEach(control => {\n      this.controlStatusChangesSubscription.add(control.statusChanges.subscribe(() => {\n        this.handleControlStatusChange(control);\n      }));\n    });\n  }\n\n\n\n  private getFirstErrorPerControl() {\n    return this._for.filter(control => this.configuration && this.configuration.displayValidationMessageWhen ?\n      this.configuration.displayValidationMessageWhen(control, this.formSubmitted) : control.touched || this.formSubmitted\n    ).map(ValidationError.fromFirstError).filter(value => value !== undefined) as ValidationError[];\n  }\n\n  /**\n   * Validates that the child ValidationMessageComponents declare what FormControl they specify a message for (when needed); and\n   * that the declared FormControl is actually part of the parent ValidationMessagesComponent 'for' collection (when specified).\n   */\n  private validateChildren() {\n    if (!this.messageComponents) {\n      return;\n    }\n\n    this.messageComponents.forEach(component => {\n      if (this._for.length > 1 && component.for === undefined) {\n        throw new Error(`Specify the FormControl for which the arv-validation-message element with key '${component.key}' ` +\n          `should show messages.`);\n      }\n      if (component.for && this._for.indexOf(component.for as UntypedFormControl) === -1) {\n        throw new Error(`A arv-validation-messages element with key '${component.key}' attempts to show messages ` +\n          `for a FormControl that is not declared in the parent arv-validation-messages element.`);\n      }\n    });\n  }\n\n  private handleControlStatusChange(control: UntypedFormControl) {\n    if (!this.messageComponents) {\n      return;\n    }\n\n    this.messageComponents.filter(component => component.for === control || component.for === undefined)\n      .forEach(component => component.reset());\n\n    const error = ValidationError.fromFirstError(control);\n    if (!error || error.hasMessage()) {\n      return;\n    }\n\n    const messageComponent = this.messageComponents.find(component => component.canHandle(error));\n\n    if (messageComponent) {\n      messageComponent.show(error);\n    } else {\n      throw new Error(`There is no suitable arv-validation-message element to show the '${error.key}' ` +\n        `error of '${getControlPath(error.control)}'`);\n    }\n  }\n}\n","<div *ngIf=\"!isValid()\">\n  <div class=\"invalid-feedback\">\n    <p *ngFor=\"let message of getErrorMessages()\">{{message}}</p>\n  </div>\n  <ng-content></ng-content>\n</div>\n"]}