![Valid]( "Valid")
本文介绍了检查后表情发生了变化.以前的值:'ng-valid:true'.当前值:'ng-valid:false'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
我在父组件和子组件内的部分中有角反应形式.
在子组件内，我有一个复选框 - 当它被选中时 - 更多字段打开，我希望它们都是必需的.
我正在使用 setValidators，但出现错误
ParentFormComponent.html:3 ERROR 错误:ExpressionChangedAfterItHasBeenCheckedError:表达式已更改检查完之后.以前的值:'ng-valid:true'.当前值:'ng-valid:假'.在 viewDebugError (core.js:7601)在 expressionChangedAfterItHasBeenCheckedError (core.js:7589)在 checkBindingNoChanges (core.js:7691)在 checkNoChangesNodeInline (core.js:10560)在 checkNoChangesNode (core.js:10541)在 debugCheckNoChangesNode (core.js:11144)在 debugCheckRenderNodeFn (core.js:11098)在 Object.eval [as updateRenderer] (ParentFormComponent.html:3)在 Object.debugUpdateRenderer [作为 updateRenderer] (core.js:11087)在 checkNoChangesView (core.js:10442)
ParentFormComponent.html:3 ERROR CONTEXT DebugContext_ {view: Object,nodeIndex: 2, nodeDef: Object, elDef: Object, elView: Object}
这是ParentFormComponent.html:3的那一行
这是我的代码:
在 ts 文件中:
checkValue(name:string, event: any){如果(事件 == 真){this.test.push(name);如果(名称==db"){this.childForm.get('_monitorDB').get('ServerName').setValidators([Validators.required]);this.childForm.get('_monitorDB').get('DbName').setValidators([Validators.required]);this.childForm.get('_monitorDB').get('DB_tableName').setValidators([Validators.required]);this.childForm.get('_monitorDB').get('DbPort').setValidators([Validators.required]);this.childForm.get('_monitorDB').get('Query').setValidators([Validators.required]);this.childForm.get('_monitorDB').get('Premissions').setValidators([Validators.required]);}}别的{const index: number = this.test.indexOf(name);如果(索引！== -1){this.test.splice(index, 1);如果(名称==db"){this.childForm.get('_monitorDB').get('ServerName').clearValidators();this.childForm.get('_monitorDB').get('ServerName').updateValueAndValidity();this.childForm.get('_monitorDB').get('DbName').clearValidators();this.childForm.get('_monitorDB').get('DbName').updateValueAndValidity();this.childForm.get('_monitorDB').get('DB_tableName').clearValidators();this.childForm.get('_monitorDB').get('DB_tableName').updateValueAndValidity();this.childForm.get('_monitorDB').get('DbPort').clearValidators();this.childForm.get('_monitorDB').get('DbPort').updateValueAndValidity();this.childForm.get('_monitorDB').get('Query').clearValidators();this.childForm.get('_monitorDB').get('Query').updateValueAndValidity();this.childForm.get('_monitorDB').get('Premissions').clearValidators();this.childForm.get('_monitorDB').get('Premissions').updateValueAndValidity();}}}this.checkboxArr.emit(this.test);}
解决方案
我遇到了同样的问题，我使用 AfterViewChecked 和 ChangeDetectorRef 修复了它:
import { AfterViewChecked, ChangeDetectorRef } from '@angular/core'导出类 ClassName 实现 AfterViewChecked {构造函数(私有只读 changeDetectorRef: ChangeDetectorRef){}ngAfterViewChecked(): 无效 {this.changeDetectorRef.detectChanges();}}
I have angular reactive form in parent component and sections inside childrens component.
Inside the child component I have a checkbox - when its checked - more fields open and I want them all to be required.
I am using setValidators but I'm getting error
this is the line of ParentFormComponent.html:3
<form [formGroup]="parentForm" (ngSubmit)="submitForm()">
Here is my code:
<label class="container">DB
<input #db type="checkbox" name="db" (change)="checkValue(db.name, db.checked)">
<span class="checkmark"></span>
</label>
<div *ngIf="db.checked" formGroupName="_monitorDB">
<mat-form-field>
<input matInput placeholder="Server name" formControlName="ServerName">
</mat-form-field>
<mat-form-field>
<input matInput placeholder="DataBase name" formControlName="DbName">
</mat-form-field>
<mat-form-field>
<input matInput placeholder="table name" formControlName="DB_tableName">
</mat-form-field>
<mat-form-field>
<input matInput placeholder="port" formControlName="DbPort">
</mat-form-field>
<mat-form-field>
<input matInput placeholder="Query" formControlName="Query">
</mat-form-field>
<mat-form-field>
<input matInput placeholder="Permissions" formControlName="Premissions">
</mat-form-field>
</div>
and in the ts file:
checkValue(name:string, event: any){
if (event == true){
this.test.push(name);
if (name =="db"){
this.childForm.get('_monitorDB').get('ServerName').setValidators([Validators.required]);
this.childForm.get('_monitorDB').get('DbName').setValidators([Validators.required]);
this.childForm.get('_monitorDB').get('DB_tableName').setValidators([Validators.required]);
this.childForm.get('_monitorDB').get('DbPort').setValidators([Validators.required]);
this.childForm.get('_monitorDB').get('Query').setValidators([Validators.required]);
this.childForm.get('_monitorDB').get('Premissions').setValidators([Validators.required]);
}
}
else{
const index: number = this.test.indexOf(name);
if (index !== -1) {
this.test.splice(index, 1);
if (name =="db"){
this.childForm.get('_monitorDB').get('ServerName').clearValidators();
this.childForm.get('_monitorDB').get('ServerName').updateValueAndValidity();
this.childForm.get('_monitorDB').get('DbName').clearValidators();
this.childForm.get('_monitorDB').get('DbName').updateValueAndValidity();
this.childForm.get('_monitorDB').get('DB_tableName').clearValidators();
this.childForm.get('_monitorDB').get('DB_tableName').updateValueAndValidity();
this.childForm.get('_monitorDB').get('DbPort').clearValidators();
this.childForm.get('_monitorDB').get('DbPort').updateValueAndValidity();
this.childForm.get('_monitorDB').get('Query').clearValidators();
this.childForm.get('_monitorDB').get('Query').updateValueAndValidity();
this.childForm.get('_monitorDB').get('Premissions').clearValidators();
this.childForm.get('_monitorDB').get('Premissions').updateValueAndValidity();
}
}
}
this.checkboxArr.emit(this.test);
}
解决方案
I faced the same issue and I fixed it by using AfterViewChecked and ChangeDetectorRef:
import { AfterViewChecked, ChangeDetectorRef } from '@angular/core'
export class ClassName implements AfterViewChecked {
constructor(private readonly changeDetectorRef: ChangeDetectorRef) {}
ngAfterViewChecked(): void {
this.changeDetectorRef.detectChanges();
}
}
这篇关于检查后表情发生了变化.以前的值:'ng-valid:true'.当前值:'ng-valid:false'的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！