angular - 仅在焦点或无效数据加载时加载反应式错误验证消息
问题描述
从事 Angular 5 表单验证。一切工作正常,除了错误消息显示移动页面加载,只有当加载的数据不抱怨验证但不抱怨未触及的选项卡,即空文本框时,这才正常。
我只想在用户开始输入时显示错误消息,除非加载的数据无效。令人惊讶的是, minLength 和 maxLength 表现得如我所愿,不确定其他人
模板
<div *ngIf="form.controls[question.key].invalid && (form.controls[question.key].invalid || form.controls[question.key].touched)" class="alert alert-danger">
<div *ngIf="form.controls[question.key].hasError('required')">
Name is required.
</div>
<div *ngIf="form.controls[question.key].hasError('email')">
Email Format is Incorrect.
</div>
<div *ngIf="form.controls[question.key].hasError('minlength')">
Minimum Length Required.
</div>
<div *ngIf="form.controls[question.key].hasError('maxlength')">
Maximum Length Required.
</div>
<div *ngIf="form.controls[question.key].hasError('postCode')">
PostCode Incorrect.
</div>
</div>
验证服务类
@Injectable()
export class QuestionControlService {
private validations: ValidatorFn[] = [];
constructor() {
}
toFormGroup(questions: QuestionBase<any>[]) {
let group: any = {};
questions.forEach(question => {
this.validations = [];
debugger;
for (var key in question.validations) {
this.mapValidation(question.validations[key].title, question.validations[key].value);
}
group[question.key] = new FormControl(question.value || '', this.validations);
});
return new FormGroup(group);
}
mapValidation(validationTitle: string, validationValue: string) {
if (validationTitle != null) {
if (validationTitle == "minLength") {
this.validations.push(Validators.minLength(parseInt(validationValue)));
} else if (validationTitle == "maxLength") {
this.validations.push(Validators.maxLength(parseInt(validationValue)));
} else if (validationTitle == "required" && validationValue == "true") {
this.validations.push(Validators.required)
} else if (validationTitle == "emailType" && validationValue == "true") {
this.validations.push(Validators.email);
} else if (validationTitle == "postCodeType" && validationValue == "true") {
this.validations.push(postCodeValidator);
}
}
}
}
//Custom Validation
//-----------------
function postCodeValidator(control: FormControl) {
let givenPostCode = control.value;
let UKPostCodePattern = /^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z]))))\s?[0-9][A-Za-z]{2})$/;
var isUKPostCodeValid = UKPostCodePattern.test(givenPostCode);
if (!isUKPostCodeValid) {
return {
postCode: {
required: "UK Valid PostCode",
provided: givenPostCode
}
}
}
return null;
}
解决方案
这会使您的错误消息等到与输入完成交互
form.controls[question.key].touched
您必须排除条件或添加另一个条件,以考虑数据已加载的事实。
它可以是这样的
form.controls[question.key].touched || isDataLoaded
所以如果表单无效并且会出现错误(输入已被触摸或数据已从某处加载)
您还可以使用指令使输入字段最初被触摸,因此将应用验证。我猜你将不得不修改它以进行条件执行。
https://stackblitz.com/edit/angular-urqles-xbvkpn?file=app/input-overview-example.html
推荐阅读
- jakarta-ee - 如何在 JAX-WS @WebService 中注入 @EJB
- reactjs - 如果我运行 create-react-app 它是用 yarn 构建的
- python - “没有类型提示或库存根”错误即使在 mypy.ini 中被忽略也会显示
- javascript - @jsplumb/browser-ui 社区版 - 动态创建节点和连接器
- r - R中的类AMOS图
- aem - 如何将查询参数传递给 Sling 模型导出器
- android - 异步过滤期间的 RecyclerView 数据更新
- css - 覆盖链式选择器上的 Tailwind CSS @apply 指令
- swift - Swift - 将 URLRessourceValue 转换为 String 以修改 .tagNames
- c - c 中的结构:在结构本身中声明新变量