import { FormControl, FormGroup, Validators } from '@angular/forms'; const form = new FormGroup({ username: new FormControl('', Validators.required, customAsyncValidator) }); 在上面的示例中,我们将customAsyncValidator作为第三个参数传递给FormControl的构造函数,这样就会在表单控件的值发生变化时进行...
*/function(control) {return_mergeErrors(_executeValidators(control, presentValidators)); }); }staticcomposeAsync(validators) {if(!validators)returnnull;/**@type{?} */constpresentValidators = (/**@type{?} */(validators.filter(isPresent)));if(presentValidators.length==0)returnnull;return(/** ...
现在,我应该怎么做才能以异步方式完成完全相同的事情(基本上是调用执行httpClient请求的服务)? Angular文档中提供的所有示例都与单个FormControl验证相关(afaik:如果将验证程序附加到单个FormControl,则无法访问其他FormControl)https://angular.io/guide/form-validation#creating-asynchronous-validators Thanks发布于 9 月前...
In this guide let us learn how to create a custom async validator in Angular. The creating an async validator is very similar to the Sync validators. The only difference is that the async Validators must return the result of the validation as an observable (or as Promise)....
Directive部分大致如下: (function(){varinjectParams = ['$q', 'dataService'];varmyUniqueDirective =function($q, dataService){varlink =function(scope, element, attrs, ngModel){ ngModel.$asyncValidators.unique=function(modelValue, viewValue){vardeferred =$q.defer(), ...
问具有多个AsyncValidator时处于挂起状态的Angular FormBuilderEN一个AsyncValidator比你的代码简单一些。(...
In Angular, you achieve this using Async Validators, which we are going to look at in this post. We are going to build a simple reactive form. It will contain a single form field called username. Then, whenever the user enters their username, we are going to check if it exists and ...
下面以Angular angular/forms作为示例,演示一下如何使用AsyncValidator格式来实现密码确认字段的实时验证: 1.导入必要的依赖 import { FormBuilder, FormGroup, Validators, FormControl } from'angular/forms'; 2.定义异步验证器函数 async passwordMatchValidator(control: FormControl): Promise<{ [key: string]: any...
Just type something in the input box, triggering validators and you'll see that the HTTP call fetching the JSON error object works, that the observable .do() method is called, logging the result in the console, but the returned Observable is never resolved by Angular, and that the form st...
async-validator是一个表单异步校验库,阿里旗下的 Ant-design 和 Element 组件库中的表单验证使用的都是async-validator,目前版本已更新到 4.0.7 ,下载量达到 1,067,202次,不仅支持 js ,同时也可支持 typeScript 。是一个 async-validator源码学习