5 lines
8.6 KiB
JSON
5 lines
8.6 KiB
JSON
{
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"id": "api/forms/AsyncValidator",
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"title": "AsyncValidator",
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"contents": "\n\n<article>\n <div class=\"breadcrumb-container\">\n <div class=\"breadcrumb\">\n <script type=\"application/ld+json\">\n {\n \"@context\": \"http://schema.org\",\n \"@type\": \"BreadcrumbList\",\n \"itemListElement\": [\n { \"@type\": \"ListItem\", \"position\": 1, \"item\": { \"@id\": \"https://angular.io//api\", \"name\": \"API\" } },\n { \"@type\": \"ListItem\", \"position\": 2, \"item\": { \"@id\": \"https://angular.io/api/forms\", \"name\": \"@angular/forms\" } },\n { \"@type\": \"ListItem\", \"position\": 3, \"item\": { \"@id\": \"https://angular.io/api/forms/AsyncValidator\", \"name\": \"AsyncValidator\" } }\n ]\n }\n </script>\n <a href=\"/api\">API</a> > <a href=\"api/forms\">@angular/forms</a>\n </div>\n <div class=\"github-links\">\n <a href=\"https://github.com/angular/angular/edit/master/packages/forms/src/directives/validators.ts?message=docs(forms)%3A%20describe%20your%20change...#L254-L295\" aria-label=\"Suggest Edits\" title=\"Suggest Edits\"><i class=\"material-icons\" aria-hidden=\"true\" role=\"img\">mode_edit</i></a>\n <a href=\"https://github.com/angular/angular/tree/12.0.0-next.7/packages/forms/src/directives/validators.ts#L254-L295\" aria-label=\"View Source\" title=\"View Source\"><i class=\"material-icons\" aria-hidden=\"true\" role=\"img\">code</i></a>\n</div>\n </div>\n \n <header class=\"api-header\">\n <h1 id=\"asyncvalidator\">AsyncValidator<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/forms/AsyncValidator#asyncvalidator\"><i class=\"material-icons\">link</i></a></h1>\n \n <label class=\"api-type-label interface\">interface</label>\n \n \n \n </header>\n \n <aio-toc class=\"embedded\"></aio-toc>\n\n <div class=\"api-body\">\n \n <section class=\"short-description\">\n <p>An interface implemented by classes that perform asynchronous validation.</p>\n\n \n </section>\n \n \n <section class=\"interface-overview\">\n<code-example language=\"ts\" hidecopy=\"true\">\ninterface <a href=\"api/forms/AsyncValidator\" class=\"code-anchor\">AsyncValidator</a> extends <a class=\"code-anchor\" href=\"api/forms/Validator\">Validator</a> {\n <a class=\"code-anchor\" href=\"api/forms/AsyncValidator#validate\"><span class=\"member-name\">validate</span>(control: AbstractControl): Promise<ValidationErrors | null> | Observable<ValidationErrors | null></a>\n\n // inherited from <a class=\"code-anchor\" href=\"api/forms/Validator\">forms/Validator</a>\n <a class=\"code-anchor\" href=\"api/forms/Validator#validate\"><span class=\"member-name\">validate</span>(control: AbstractControl): ValidationErrors | null</a>\n <a class=\"code-anchor\" href=\"api/forms/Validator#registerOnValidatorChange\"><span class=\"member-name\">registerOnValidatorChange</span>(fn: () => void)?: void</a>\n}\n</code-example>\n\n \n \n\n\n \n \n\n</section>\n\n \n\n \n \n \n\n \n\n<section class=\"instance-methods\">\n <h2 id=\"methods\">Methods<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/forms/AsyncValidator#methods\"><i class=\"material-icons\">link</i></a></h2>\n \n <a id=\"validate\"></a>\n<table class=\"is-full-width method-table instance-method\">\n <thead><tr><th>\n <div class=\"with-github-links\">\n <h3 id=\"validate\">\n validate()\n \n <a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/forms/AsyncValidator#validate\"><i class=\"material-icons\">link</i></a></h3>\n <div class=\"github-links\">\n <a href=\"https://github.com/angular/angular/edit/master/packages/forms/src/directives/validators.ts?message=docs(forms)%3A%20describe%20your%20change...#L284-L294\" aria-label=\"Suggest Edits\" title=\"Suggest Edits\"><i class=\"material-icons\" aria-hidden=\"true\" role=\"img\">mode_edit</i></a>\n <a href=\"https://github.com/angular/angular/tree/12.0.0-next.7/packages/forms/src/directives/validators.ts#L284-L294\" aria-label=\"View Source\" title=\"View Source\"><i class=\"material-icons\" aria-hidden=\"true\" role=\"img\">code</i></a>\n</div>\n </div>\n </th></tr></thead>\n <tbody>\n <tr>\n <td class=\"short-description\">\n <p>Method that performs async validation against the provided control.</p>\n\n </td>\n </tr>\n \n <tr>\n <td>\n <div class=\"overload-info\">\n \n\n <code-example language=\"ts\" hidecopy=\"true\" class=\"no-box api-heading\"><span class=\"member-name\">validate</span>(control: <a href=\"api/forms/AbstractControl\" class=\"code-anchor\">AbstractControl</a>): Promise<<a href=\"api/forms/ValidationErrors\" class=\"code-anchor\">ValidationErrors</a> | null> | Observable<<a href=\"api/forms/ValidationErrors\" class=\"code-anchor\">ValidationErrors</a> | null></code-example>\n\n \n\n <h6 class=\"no-anchor\" id=\"parameters\">Parameters</h6>\n <table class=\"is-full-width list-table parameters-table instance-method-overload-parameters\">\n <tbody>\n \n <tr class=\"instance-method-overload-parameter\">\n <td class=\"param-name\">\n <a id=\"\"></a>\n <code>control</code>\n </td>\n <td class=\"param-type\"><code><a href=\"api/forms/AbstractControl\" class=\"code-anchor\">AbstractControl</a></code></td>\n <td class=\"param-description\">\n <p>The control to validate against.</p>\n\n </td>\n </tr>\n </tbody>\n</table>\n\n \n <h6 class=\"no-anchor\" id=\"returns\">Returns</h6>\n <p><code>Promise<<a href=\"api/forms/ValidationErrors\" class=\"code-anchor\">ValidationErrors</a> | null> | Observable<<a href=\"api/forms/ValidationErrors\" class=\"code-anchor\">ValidationErrors</a> | null></code>: A promise or observable that resolves a map of validation errors\nif validation fails, otherwise null.</p>\n\n \n\n\n \n\n \n</div>\n </td>\n </tr>\n \n\n \n\n \n </tbody>\n</table>\n\n \n</section>\n\n\n \n<section class=\"usage-notes\">\n <h2 id=\"usage-notes\">Usage notes<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/forms/AsyncValidator#usage-notes\"><i class=\"material-icons\">link</i></a></h2>\n <h3 id=\"provide-a-custom-async-validator-directive\">Provide a custom async validator directive<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/forms/AsyncValidator#provide-a-custom-async-validator-directive\"><i class=\"material-icons\">link</i></a></h3>\n<p>The following example implements the <code><a href=\"api/forms/AsyncValidator\" class=\"code-anchor\">AsyncValidator</a></code> interface to create an\nasync validator directive with a custom error key.</p>\n<code-example language=\"typescript\">\nimport { of } from 'rxjs';\n\n@<a href=\"api/core/Directive\" class=\"code-anchor\">Directive</a>({\n selector: '[customAsyncValidator]',\n providers: [{provide: <a href=\"api/forms/NG_ASYNC_VALIDATORS\" class=\"code-anchor\">NG_ASYNC_VALIDATORS</a>, useExisting: CustomAsyncValidatorDirective, multi:\ntrue}]\n})\nclass CustomAsyncValidatorDirective implements <a href=\"api/forms/AsyncValidator\" class=\"code-anchor\">AsyncValidator</a> {\n validate(control: <a href=\"api/forms/AbstractControl\" class=\"code-anchor\">AbstractControl</a>): Observable<<a href=\"api/forms/ValidationErrors\" class=\"code-anchor\">ValidationErrors</a>|null> {\n return of({'custom': true});\n }\n}\n</code-example>\n\n</section>\n\n\n\n </div>\n</article>\n\n<!-- links to this doc:\n - api/forms\n - api/forms/Validator\n - guide/form-validation\n-->\n<!-- links from this doc:\n - /api\n - api/core/Directive\n - api/forms\n - api/forms/AbstractControl\n - api/forms/AsyncValidator#asyncvalidator\n - api/forms/AsyncValidator#methods\n - api/forms/AsyncValidator#provide-a-custom-async-validator-directive\n - api/forms/AsyncValidator#usage-notes\n - api/forms/AsyncValidator#validate\n - api/forms/NG_ASYNC_VALIDATORS\n - api/forms/ValidationErrors\n - api/forms/Validator\n - api/forms/Validator#registerOnValidatorChange\n - api/forms/Validator#validate\n - https://github.com/angular/angular/edit/master/packages/forms/src/directives/validators.ts?message=docs(forms)%3A%20describe%20your%20change...#L254-L295\n - https://github.com/angular/angular/edit/master/packages/forms/src/directives/validators.ts?message=docs(forms)%3A%20describe%20your%20change...#L284-L294\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/forms/src/directives/validators.ts#L254-L295\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/forms/src/directives/validators.ts#L284-L294\n-->"
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} |