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<!doctype html> <html class="no-js" lang=""> <head> <meta charset="utf-8"> <meta http-equiv="x-ua-compatible" content="ie=edge"> <title>carbon-components-angular documentation</title> <meta name="description" content=""> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="icon" type="image/x-icon" href="../images/favicon.ico"> <link rel="stylesheet" href="../styles/style.css"> <link rel="stylesheet" href="../styles/dark.css"> <style> footer.carbon { position: absolute; bottom: 0; width: 100%; z-index: 9999; } #root > div { /* * Subtracting the height of the footer to prevent * overlaying the footer ontop of content */ height: calc(100vh - 48px); } </style> </head> <body> <script> // Blocking script to avoid flickering dark mode // Dark mode toggle button var useDark = window.matchMedia('(prefers-color-scheme: dark)'); var darkModeState = useDark.matches; var $darkModeToggleSwitchers = document.querySelectorAll('.dark-mode-switch input'); var $darkModeToggles = document.querySelectorAll('.dark-mode-switch'); var darkModeStateLocal = localStorage.getItem('compodoc_darkmode-state'); function checkToggle(check) { for (var i = 0; i < $darkModeToggleSwitchers.length; i++) { $darkModeToggleSwitchers[i].checked = check; } } function toggleDarkMode(state) { if (window.localStorage) { localStorage.setItem('compodoc_darkmode-state', state); } checkToggle(state); const hasClass = document.body.classList.contains('dark'); if (state) { for (var i = 0; i < $darkModeToggles.length; i++) { $darkModeToggles[i].classList.add('dark'); } if (!hasClass) { document.body.classList.add('dark'); } } else { for (var i = 0; i < $darkModeToggles.length; i++) { $darkModeToggles[i].classList.remove('dark'); } if (hasClass) { document.body.classList.remove('dark'); } } } useDark.addEventListener('change', function (evt) { toggleDarkMode(evt.matches); }); if (darkModeStateLocal) { darkModeState = darkModeStateLocal === 'true'; } toggleDarkMode(darkModeState); </script> <div class="navbar navbar-default navbar-fixed-top d-md-none p-0"> <div class="d-flex"> <a href="../" class="navbar-brand">carbon-components-angular documentation</a> <button type="button" class="btn btn-default btn-menu ion-ios-menu" id="btn-menu"></button> </div> </div> <div class="xs-menu menu" id="mobile-menu"> <div id="book-search-input" role="search"><input type="text" placeholder="Type to search"></div> <compodoc-menu></compodoc-menu> </div> <div class="container-fluid main"> <div class="row main"> <div class="d-none d-md-block menu"> <compodoc-menu mode="normal"></compodoc-menu> </div> <!-- START CONTENT --> <div class="content class"> <div class="content-data"> <ol class="breadcrumb"> <li class="breadcrumb-item">Classes</li> <li class="breadcrumb-item" >Overridable</li> </ol> <ul class="nav nav-tabs" role="tablist"> <li class="nav-item"> <a href="#info" class="nav-link" class="nav-link active" role="tab" id="info-tab" data-bs-toggle="tab" data-link="info">Info</a> </li> <li class="nav-item"> <a href="#source" class="nav-link" role="tab" id="source-tab" data-bs-toggle="tab" data-link="source">Source</a> </li> </ul> <div class="tab-content"> <div class="tab-pane fade active in" id="info"> <p class="comment"> <h3>File</h3> </p> <p class="comment"> <code>src/i18n/i18n.service.ts</code> </p> <p class="comment"> <h3>Description</h3> </p> <p class="comment"> <p>Represents an &quot;overridable&quot; translation value.</p> <p>Largely an internal usecase. There are situations where we want an <code>Observable</code> that can emit events from a centralized source <strong>OR</strong> an <code>Observable</code> that will emit events from a component local source. The key example being on/off text in a <code>Toggle</code> - In some cases we want the <code>Toggle</code> to use <code>I18n</code>s global translations, but in others we&#39;d prefer to use a local override. We don&#39;t ever need to return to a non-overridden state, but we do need the ability to switch <em>to</em> an overridden sate.</p> </p> <section data-compodoc="block-index"> <h3 id="index">Index</h3> <table class="table table-sm table-bordered index-table"> <tbody> <tr> <td class="col-md-4"> <h6><b>Properties</b></h6> </td> </tr> <tr> <td class="col-md-4"> <ul class="index-list"> <li> <span class="modifier">Protected</span> <a href="#_value" >_value</a> </li> <li> <span class="modifier">Protected</span> <a href="#$override" >$override</a> </li> <li> <span class="modifier">Protected</span> <a href="#baseTranslation" >baseTranslation</a> </li> <li> <span class="modifier">Protected</span> <a href="#isOverridden" >isOverridden</a> </li> <li> <span class="modifier">Protected</span> <a href="#subscription" >subscription</a> </li> </ul> </td> </tr> <tr> <td class="col-md-4"> <h6><b>Methods</b></h6> </td> </tr> <tr> <td class="col-md-4"> <ul class="index-list"> <li> <a href="#override" >override</a> </li> </ul> </td> </tr> <tr> <td class="col-md-4"> <h6><b>Accessors</b></h6> </td> </tr> <tr> <td class="col-md-4"> <ul class="index-list"> <li> <a href="#value" >value</a> </li> <li> <a href="#subject" >subject</a> </li> </ul> </td> </tr> </tbody> </table> </section> <section data-compodoc="block-constructor"> <h3 id="constructor">Constructor</h3> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <code>constructor(path: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank">string</a>, i18n: <a href="../injectables/I18n.html" target="_self">I18n</a>)</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="99" class="link-to-prism">src/i18n/i18n.service.ts:99</a></div> </td> </tr> <tr> <td class="col-md-4"> <div> <b>Parameters :</b> <table class="params"> <thead> <tr> <td>Name</td> <td>Type</td> <td>Optional</td> </tr> </thead> <tbody> <tr> <td>path</td> <td> <code><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/string" target="_blank" >string</a></code> </td> <td> No </td> </tr> <tr> <td>i18n</td> <td> <code><a href="../injectables/I18n.html" target="_self" >I18n</a></code> </td> <td> No </td> </tr> </tbody> </table> </div> </td> </tr> </tbody> </table> </section> <section data-compodoc="block-properties"> <h3 id="inputs"> Properties </h3> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="_value"></a> <span class="name"> <span class="modifier">Protected</span> <span ><b>_value</b></span> <a href="#_value"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <i>Type : </i> <code>string | Observable&lt;string&gt;</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="82" class="link-to-prism">src/i18n/i18n.service.ts:82</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>Overridden value. Accessed by the readonly getter <code>value</code> and set through <code>override</code></p> </div> </td> </tr> </tbody> </table> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="$override"></a> <span class="name"> <span class="modifier">Protected</span> <span ><b>$override</b></span> <a href="#$override"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <i>Type : </i> <code>BehaviorSubject&lt;string&gt;</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="86" class="link-to-prism">src/i18n/i18n.service.ts:86</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>Subject of overridden values. Initialized with our default value.</p> </div> </td> </tr> </tbody> </table> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="baseTranslation"></a> <span class="name"> <span class="modifier">Protected</span> <span ><b>baseTranslation</b></span> <a href="#baseTranslation"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <i>Type : </i> <code>Observable&lt;string&gt;</code> </td> </tr> <tr> <td class="col-md-4"> <i>Default value : </i><code>this.i18n.get(this.path)</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="90" class="link-to-prism">src/i18n/i18n.service.ts:90</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>Our base non-overridden translation.</p> </div> </td> </tr> </tbody> </table> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="isOverridden"></a> <span class="name"> <span class="modifier">Protected</span> <span ><b>isOverridden</b></span> <a href="#isOverridden"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <i>Default value : </i><code>false</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="99" class="link-to-prism">src/i18n/i18n.service.ts:99</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>A boolean to flip between overridden and non-overridden states.</p> </div> </td> </tr> </tbody> </table> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="subscription"></a> <span class="name"> <span class="modifier">Protected</span> <span ><b>subscription</b></span> <a href="#subscription"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <i>Type : </i> <code>Subscription</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="95" class="link-to-prism">src/i18n/i18n.service.ts:95</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>Subscription to the observable provided as an override (if any)</p> </div> </td> </tr> </tbody> </table> </section> <section data-compodoc="block-methods"> <h3 id="methods"> Methods </h3> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="override"></a> <span class="name"> <span ><b>override</b></span> <a href="#override"><span class="icon ion-ios-link"></span></a> </span> </td> </tr> <tr> <td class="col-md-4"> <code>override(value: string | Observable<string>)</code> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="114" class="link-to-prism">src/i18n/i18n.service.ts:114</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>Takes a string or an <code>Observable</code> that emits strings. Overrides the value provided by the <code>I18n</code> service.</p> </div> <div class="io-description"> <b>Parameters :</b> <table class="params"> <thead> <tr> <td>Name</td> <td>Type</td> <td>Optional</td> </tr> </thead> <tbody> <tr> <td>value</td> <td> <code>string | Observable&lt;string&gt;</code> </td> <td> No </td> </tr> </tbody> </table> </div> <div class="io-description"> <b>Returns : </b> <code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >void</a></code> </div> <div class="io-description"> </div> </td> </tr> </tbody> </table> </section> <section data-compodoc="block-accessors"> <h3 id="accessors"> Accessors </h3> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="value"></a> <span class="name"><b>value</b><a href="#value"><span class="icon ion-ios-link"></span></a></span> </td> </tr> <tr> <td class="col-md-4"> <span class="accessor"><b>get</b><code>value()</code></span> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="58" class="link-to-prism">src/i18n/i18n.service.ts:58</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>The raw value of the translation. Defaults to the string value, but will return the value passed to <code>override</code></p> </div> <div> </div> <div class="io-description"> <b>Returns : </b> <code>string | Observable</code> </div> </td> </tr> <tr> <td class="col-md-4"> <span class="accessor"><b>set</b><code>value(v: string | Observable<string>)</code></span> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="62" class="link-to-prism">src/i18n/i18n.service.ts:62</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"> <b>Parameters :</b> <table class="params"> <thead> <tr> <td>Name</td> <td>Type</td> <td>Optional</td> </tr> </thead> <tbody> <tr> <td>v</td> <td> <code>string | Observable&lt;string&gt;</code> </td> <td> No </td> </tr> </tbody> </table> </div> <div> </div> <div class="io-description"> <b>Returns : </b> <code><a href="https://www.typescriptlang.org/docs/handbook/basic-types.html" target="_blank" >void</a></code> </div> </td> </tr> </tbody> </table> <table class="table table-sm table-bordered"> <tbody> <tr> <td class="col-md-4"> <a name="subject"></a> <span class="name"><b>subject</b><a href="#subject"><span class="icon ion-ios-link"></span></a></span> </td> </tr> <tr> <td class="col-md-4"> <span class="accessor"><b>get</b><code>subject()</code></span> </td> </tr> <tr> <td class="col-md-4"> <div class="io-line">Defined in <a href="" data-line="71" class="link-to-prism">src/i18n/i18n.service.ts:71</a></div> </td> </tr> <tr> <td class="col-md-4"> <div class="io-description"><p>The translation subject. Returns either a stream of overridden values, or our base translation values.</p> </div> <div> </div> <div class="io-description"> <b>Returns : </b> <code>Observable&lt;string&gt;</code> </div> </td> </tr> </tbody> </table> </section> </div> <div class="tab-pane fade tab-source-code" id="source"> <pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { Injectable } from &quot;@angular/core&quot;; import { BehaviorSubject, Observable, isObservable, iif, Subscription } from &quot;rxjs&quot;; import { map } from &quot;rxjs/operators&quot;; import { merge } from &quot;carbon-components-angular/utils&quot;; import EN from &quot;./en&quot;; /** * Takes the &#x60;Observable&#x60; returned from &#x60;i18n.get&#x60; and an object of variables to replace. * * The keys specify the variable name in the string. * * Example: * &#x60;&#x60;&#x60;typescript * service.set({ &quot;TEST&quot;: &quot;{{foo}} {{bar}}&quot; }); * * service.replace(service.get(&quot;TEST&quot;), { foo: &quot;test&quot;, bar: &quot;asdf&quot; }) * &#x60;&#x60;&#x60; * * Produces: &#x60;&quot;test asdf&quot;&#x60; * * @param subject the translation to replace variables on * @param variables object of variables to replace */ export const replace &#x3D; (subject, variables) &#x3D;&gt; subject.pipe( map&lt;string, void&gt;(str &#x3D;&gt; { const keys &#x3D; Object.keys(variables); for (const key of keys) { const value &#x3D; variables[key]; str &#x3D; str.replace(new RegExp(&#x60;{{\\s*${key}\\s*}}&#x60;, &quot;g&quot;), value); } return str; }) ); /** * Represents an &quot;overridable&quot; translation value. * * Largely an internal usecase. There are situations where we want an &#x60;Observable&#x60; that * can emit events from a centralized source **OR** an &#x60;Observable&#x60; that will emit events * from a component local source. The key example being on/off text in a &#x60;Toggle&#x60; - In some cases * we want the &#x60;Toggle&#x60; to use &#x60;I18n&#x60;s global translations, but in others we&#x27;d prefer to use a local * override. We don&#x27;t ever need to return to a non-overridden state, but we do need the ability to * switch _to_ an overridden sate. */ export class Overridable { /** * The raw value of the translation. Defaults to the string value, but will return the value passed to &#x60;override&#x60; * * @readonly */ public get value(): string | Observable&lt;string&gt; { return this._value; } public set value(v: string | Observable&lt;string&gt;) { this.override(v); } /** * The translation subject. Returns either a stream of overridden values, or our base translation values. * * @readonly */ public get subject(): Observable&lt;string&gt; { /** * since inputs are bound on template instantiation (and thusly will always have _some_ value) * We can use a simple boolean and the &#x60;iif&#x60; function to determine which subject to return on subscription */ return iif(() &#x3D;&gt; this.isOverridden, this.$override, this.baseTranslation); } /** * Overridden value. Accessed by the readonly getter &#x60;value&#x60; and set through &#x60;override&#x60; */ protected _value: string | Observable&lt;string&gt;; /** * Subject of overridden values. Initialized with our default value. */ protected $override: BehaviorSubject&lt;string&gt;; /** * Our base non-overridden translation. */ protected baseTranslation: Observable&lt;string&gt; &#x3D; this.i18n.get(this.path); /** * Subscription to the observable provided as an override (if any) */ protected subscription: Subscription; /** * A boolean to flip between overridden and non-overridden states. */ protected isOverridden &#x3D; false; constructor(protected path: string, protected i18n: I18n) { /** * ensure &#x60;$override&#x60; is initialized with the correct default value * in some cases &#x60;_value&#x60; can get changed for an &#x60;Observable&#x60; before &#x60;$override&#x60; is created */ const value &#x3D; this.i18n.getValueFromPath(this.path) as string; this.$override &#x3D; new BehaviorSubject&lt;string&gt;(value); this._value &#x3D; value; } /** * Takes a string or an &#x60;Observable&#x60; that emits strings. * Overrides the value provided by the &#x60;I18n&#x60; service. */ override(value: string | Observable&lt;string&gt;) { this.isOverridden &#x3D; true; // To ensure that there are not multiple subscriptions created for the same observable, we // unsubscribe if a subscription already exists for an observable before creating a new one. if (this.subscription) { this.subscription.unsubscribe(); this.subscription &#x3D; null; } this._value &#x3D; value; if (isObservable(value)) { this.subscription &#x3D; value.subscribe(v &#x3D;&gt; { this.$override.next(v); }); } else { this.$override.next(value); } } } /** * An object of strings, should follow the same format as src/i18n/en.json */ export type TranslationStrings &#x3D; { [key: string]: string | TranslationStrings; }; /** * The I18n service is a minimal internal singleton service used to supply our components with translated strings. * * All the components that support I18n also support directly passed strings. * Usage of I18n is optional, and it is not recommended for application use (libraries like ngx-translate * are a better choice) * */ @Injectable() export class I18n { protected translationStrings: TranslationStrings &#x3D; EN; protected translations &#x3D; new Map(); protected locale &#x3D; new BehaviorSubject(&quot;en&quot;); /** * Sets the locale and optionally the translation strings. Locale is used by components that * are already locale aware (datepicker for example) while the translation strings are used * for components that are not. * * Locales set here will override locales/languages set in components * @param language an ISO 639-1 language code - https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes * @param strings an object of strings, optional */ public setLocale(language: string, strings?: TranslationStrings) { this.locale.next(language); if (strings) { this.set(strings); } } /** * Returns the current locale */ public getLocale() { return this.locale.value; } /** * Returns an observable that resolves to the current locale, and will update when changed */ public getLocaleObservable() { return this.locale.asObservable(); } /** * Set/update the translations from an object. Also notifies all participating components of the update. * * @param strings an object of strings, should follow the same format as src/i18n/en.json */ public set(strings: TranslationStrings) { this.translationStrings &#x3D; merge({}, EN, strings); // iterate over all our tracked translations and update each observable const translations &#x3D; Array.from(this.translations); for (const [path, subject] of translations) { subject.next(this.getValueFromPath(path)); } } /** * When a path is specified returns an observable that will resolve to the translation string value. * * Returns the full translations object if path is not specified. * * @param path optional, looks like &#x60;&quot;NOTIFICATION.CLOSE_BUTTON&quot;&#x60; */ public get(path?: string): any { if (!path) { return this.translationStrings; } return this.getSubject(path); } /** * Returns all descendents of some path fragment as an object. * * @param partialPath a path fragment, for example &#x60;&quot;NOTIFICATION&quot;&#x60; */ public getMultiple(partialPath: string): { [key: string]: Observable&lt;string&gt; } { const values &#x3D; this.getValueFromPath(partialPath); const subjects &#x3D; {}; for (const key of Object.keys(values)) { if (values[key] &#x3D;&#x3D;&#x3D; Object(values[key])) { subjects[key] &#x3D; this.getMultiple(&#x60;${partialPath}.${key}&#x60;); } else { subjects[key] &#x3D; this.getSubject(&#x60;${partialPath}.${key}&#x60;); } } return subjects; } /** * Returns an instance of &#x60;Overridable&#x60; that can be used to optionally override the value provided by &#x60;I18n&#x60; * @param path looks like &#x60;&quot;NOTIFICATION.CLOSE_BUTTON&quot;&#x60; */ public getOverridable(path: string) { return new Overridable(path, this); } /** * Takes the &#x60;Observable&#x60; returned from &#x60;i18n.get&#x60; and an object of variables to replace. * * The keys specify the variable name in the string. * * Example: * &#x60;&#x60;&#x60; * service.set({ &quot;TEST&quot;: &quot;{{foo}} {{bar}}&quot; }); * * service.replace(service.get(&quot;TEST&quot;), { foo: &quot;test&quot;, bar: &quot;asdf&quot; }) * &#x60;&#x60;&#x60; * * Produces: &#x60;&quot;test asdf&quot;&#x60; * * @param subject the translation to replace variables on * @param variables object of variables to replace */ public replace(subject: Observable&lt;string&gt;, variables: { [key: string]: string }) { return replace(subject, variables); } /** * Trys to resolve a value from the provided path. * * @param path looks like &#x60;&quot;NOTIFICATION.CLOSE_BUTTON&quot;&#x60; */ public getValueFromPath(path: string): string | TranslationStrings { let value: string | TranslationStrings &#x3D; this.translationStrings; for (const segment of path.split(&quot;.&quot;)) { if (value[segment] !&#x3D;&#x3D; undefined &amp;&amp; value[segment] !&#x3D;&#x3D; null) { value &#x3D; value[segment]; } else { throw new Error(&#x60;no key ${segment} at ${path}&#x60;); } } return value as any; } /** * Helper method that returns an observable from the internal cache based on the path * * @param path looks like &#x60;&quot;NOTIFICATION.CLOSE_BUTTON&quot;&#x60; */ protected getSubject(path: string): Observable&lt;string&gt; { try { // we run this here to validate the path exists before adding it to the translation map const value &#x3D; this.getValueFromPath(path) as string; if (this.translations.has(path)) { return this.translations.get(path); } const translation &#x3D; new BehaviorSubject(value); this.translations.set(path, translation); return translation; } catch (error) { console.error(error); } } } </code></pre> </div> </div> </div><div class="search-results"> <div class="has-results"> <h1 class="search-results-title"><span class='search-results-count'></span> results matching "<span class='search-query'></span>"</h1> <ul class="search-results-list"></ul> </div> <div class="no-results"> <h1 class="search-results-title">No results matching "<span class='search-query'></span>"</h1> </div> </div> </div> <!-- END CONTENT --> </div> </div> <label class="dark-mode-switch"> <input type="checkbox"> <span class="slider"> <svg class="slider-icon" viewBox="0 0 24 24" fill="none" height="20" stroke="#000" stroke-linecap="round" stroke-linejoin="round" stroke-width="2" width="20" xmlns="http://www.w3.org/2000/svg"> <path d="M21 12.79A9 9 0 1111.21 3 7 7 0 0021 12.79z"></path> </svg> </span> </label> <script> var COMPODOC_CURRENT_PAGE_DEPTH = 1; 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