{
  "id": "api/elements/NgElement",
  "title": "NgElement",
  "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/elements\", \"name\": \"@angular/elements\" } },\n            { \"@type\": \"ListItem\", \"position\": 3, \"item\": { \"@id\": \"https://angular.io/api/elements/NgElement\", \"name\": \"NgElement\" } }\n          ]\n        }\n      </script>\n        <a href=\"/api\">API</a> > <a href=\"api/elements\">@angular/elements</a>\n    </div>\n    <div class=\"github-links\">\n  <a href=\"https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L38-L74\" 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/elements/src/create-custom-element.ts#L38-L74\" 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=\"ngelement\">NgElement<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/elements/NgElement#ngelement\"><i class=\"material-icons\">link</i></a></h1>\n    \n    <label class=\"api-type-label class\">class</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>Implements the functionality needed for a custom element.</p>\n\n    \n  </section>\n  \n  \n  \n  <section class=\"class-overview\">\n<code-example language=\"ts\" hidecopy=\"true\">\nabstract class <a href=\"api/elements/NgElement\" class=\"code-anchor\">NgElement</a> extends HTMLElement {\n  <a class=\"code-anchor\" href=\"api/elements/NgElement#ngElementStrategy\">protected abstract <span class=\"member-name\">ngElementStrategy</span>: NgElementStrategy</a>\n  <a class=\"code-anchor\" href=\"api/elements/NgElement#ngElementEventsSubscription\">protected <span class=\"member-name\">ngElementEventsSubscription</span>: Subscription | null</a>\n  <a class=\"code-anchor\" href=\"api/elements/NgElement#attributeChangedCallback\">abstract <span class=\"member-name\">attributeChangedCallback</span>(attrName: string, oldValue: string, newValue: string, namespace?: string): void</a>\n  <a class=\"code-anchor\" href=\"api/elements/NgElement#connectedCallback\">abstract <span class=\"member-name\">connectedCallback</span>(): void</a>\n  <a class=\"code-anchor\" href=\"api/elements/NgElement#disconnectedCallback\">abstract <span class=\"member-name\">disconnectedCallback</span>(): void</a>\n}\n</code-example>\n\n  \n  \n\n</section>\n\n\n  \n\n  \n  \n  \n\n\n\n\n\n\n\n\n<section class=\"instance-properties\">\n  <h2 id=\"properties\">Properties<a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/elements/NgElement#properties\"><i class=\"material-icons\">link</i></a></h2>\n  <table class=\"is-full-width list-table property-table\">\n    <thead>\n      <tr>\n        <th>Property</th>\n        <th>Description</th>\n      </tr>\n    </thead>\n    <tbody>\n    \n      <tr class=\"instance-property\">\n        <td>\n          <a id=\"ngElementStrategy\"></a>\n          <code class=\"\">protected abstract <span class=\"member-name\">ngElementStrategy</span>: NgElementStrategy</code>\n        </td>\n        <td>\n          \n          <p>The strategy that controls how a component is transformed in a custom element.</p>\n\n          \n          </td>\n    </tr>\n    \n      <tr class=\"instance-property\">\n        <td>\n          <a id=\"ngElementEventsSubscription\"></a>\n          <code class=\"\">protected <span class=\"member-name\">ngElementEventsSubscription</span>: Subscription | null</code>\n        </td>\n        <td>\n          \n          <p>A subscription to change, connect, and disconnect events in the custom element.</p>\n\n          \n          </td>\n    </tr>\n    \n    </tbody>\n  </table>\n</section>\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/elements/NgElement#methods\"><i class=\"material-icons\">link</i></a></h2>\n  \n    <a id=\"attributeChangedCallback\"></a>\n<table class=\"is-full-width method-table instance-method\">\n  <thead><tr><th>\n    <div class=\"with-github-links\">\n    <h3 id=\"attributechangedcallback\">\n      attributeChangedCallback()\n      \n    <a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/elements/NgElement#attributechangedcallback\"><i class=\"material-icons\">link</i></a></h3>\n    <div class=\"github-links\">\n  <a href=\"https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L53-L63\" 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/elements/src/create-custom-element.ts#L53-L63\" 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>Prototype for a handler that responds to a change in an observed attribute.</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\">abstract <span class=\"member-name\">attributeChangedCallback</span>(attrName: string, oldValue: string, newValue: string, namespace?: string): void</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>attrName</code>\n      </td>\n      <td class=\"param-type\"><code>string</code></td>\n      <td class=\"param-description\">\n      <p>The name of the attribute that has changed.</p>\n\n      </td>\n    </tr>\n    <tr class=\"instance-method-overload-parameter\">\n      <td class=\"param-name\">\n        <a id=\"\"></a>\n        <code>oldValue</code>\n      </td>\n      <td class=\"param-type\"><code>string</code></td>\n      <td class=\"param-description\">\n      <p>The previous value of the attribute.</p>\n\n      </td>\n    </tr>\n    <tr class=\"instance-method-overload-parameter\">\n      <td class=\"param-name\">\n        <a id=\"\"></a>\n        <code>newValue</code>\n      </td>\n      <td class=\"param-type\"><code>string</code></td>\n      <td class=\"param-description\">\n      <p>The new value of the attribute.</p>\n\n      </td>\n    </tr>\n    <tr class=\"instance-method-overload-parameter\">\n      <td class=\"param-name\">\n        <a id=\"\"></a>\n        <code>namespace</code>\n      </td>\n      <td class=\"param-type\"><code>string</code></td>\n      <td class=\"param-description\">\n      <p>The namespace in which the attribute is defined.</p>\n<p>      Optional. Default is <code>undefined</code>.</p>\n\n      </td>\n    </tr>\n  </tbody>\n</table>\n\n  \n  <h6 class=\"no-anchor\" id=\"returns\">Returns</h6>\n  <p><code>void</code>: Nothing.</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    <a id=\"connectedCallback\"></a>\n<table class=\"is-full-width method-table instance-method\">\n  <thead><tr><th>\n    <div class=\"with-github-links\">\n    <h3 id=\"connectedcallback\">\n      connectedCallback()\n      \n    <a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/elements/NgElement#connectedcallback\"><i class=\"material-icons\">link</i></a></h3>\n    <div class=\"github-links\">\n  <a href=\"https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L64-L68\" 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/elements/src/create-custom-element.ts#L64-L68\" 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>Prototype for a handler that responds to the insertion of the custom element in the DOM.</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\">abstract <span class=\"member-name\">connectedCallback</span>(): void</code-example>\n\n  \n\n  <h6 class=\"no-anchor\" id=\"parameters-1\">Parameters</h6>\n  <p>There are no parameters.</p>\n\n  \n  <h6 class=\"no-anchor\" id=\"returns-1\">Returns</h6>\n  <p><code>void</code>: Nothing.</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    <a id=\"disconnectedCallback\"></a>\n<table class=\"is-full-width method-table instance-method\">\n  <thead><tr><th>\n    <div class=\"with-github-links\">\n    <h3 id=\"disconnectedcallback\">\n      disconnectedCallback()\n      \n    <a title=\"Link to this heading\" class=\"header-link\" aria-hidden=\"true\" href=\"api/elements/NgElement#disconnectedcallback\"><i class=\"material-icons\">link</i></a></h3>\n    <div class=\"github-links\">\n  <a href=\"https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L69-L73\" 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/elements/src/create-custom-element.ts#L69-L73\" 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>Prototype for a handler that responds to the deletion of the custom element from the DOM.</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\">abstract <span class=\"member-name\">disconnectedCallback</span>(): void</code-example>\n\n  \n\n  <h6 class=\"no-anchor\" id=\"parameters-2\">Parameters</h6>\n  <p>There are no parameters.</p>\n\n  \n  <h6 class=\"no-anchor\" id=\"returns-2\">Returns</h6>\n  <p><code>void</code>: Nothing.</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  \n\n\n  </div>\n</article>\n\n<!-- links to this doc:\n - api/elements\n - api/elements/NgElementConstructor\n - guide/elements\n-->\n<!-- links from this doc:\n - /api\n - api/elements\n - api/elements/NgElement#attributeChangedCallback\n - api/elements/NgElement#attributechangedcallback\n - api/elements/NgElement#connectedCallback\n - api/elements/NgElement#connectedcallback\n - api/elements/NgElement#disconnectedCallback\n - api/elements/NgElement#disconnectedcallback\n - api/elements/NgElement#methods\n - api/elements/NgElement#ngElementEventsSubscription\n - api/elements/NgElement#ngElementStrategy\n - api/elements/NgElement#ngelement\n - api/elements/NgElement#properties\n - https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L38-L74\n - https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L53-L63\n - https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L64-L68\n - https://github.com/angular/angular/edit/master/packages/elements/src/create-custom-element.ts?message=docs(elements)%3A%20describe%20your%20change...#L69-L73\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/elements/src/create-custom-element.ts#L38-L74\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/elements/src/create-custom-element.ts#L53-L63\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/elements/src/create-custom-element.ts#L64-L68\n - https://github.com/angular/angular/tree/12.0.0-next.7/packages/elements/src/create-custom-element.ts#L69-L73\n-->"
}