56 lines
1.3 KiB
TypeScript
56 lines
1.3 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Pipe, PipeTransform} from '@angular/core';
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import {isBlank, isStringMap} from '../facade/lang';
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import {InvalidPipeArgumentException} from './invalid_pipe_argument_exception';
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/**
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*
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* Generic selector that displays the string that matches the current value.
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*
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* ## Usage
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*
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* expression | i18nSelect:mapping
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*
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* where `mapping` is an object that indicates the text that should be displayed
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* for different values of the provided `expression`.
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*
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* ## Example
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*
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* ```
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* <div>
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* {{ gender | i18nSelect: inviteMap }}
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* </div>
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*
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* class MyApp {
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* gender: string = 'male';
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* inviteMap: any = {
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* 'male': 'Invite her.',
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* 'female': 'Invite him.',
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* 'other': 'Invite them.'
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* }
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* ...
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* }
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* ```
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*
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* @experimental
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*/
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@Pipe({name: 'i18nSelect', pure: true})
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export class I18nSelectPipe implements PipeTransform {
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transform(value: string, mapping: {[key: string]: string}): string {
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if (isBlank(value)) return '';
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if (!isStringMap(mapping)) {
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throw new InvalidPipeArgumentException(I18nSelectPipe, mapping);
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}
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return mapping.hasOwnProperty(value) ? mapping[value] : '';
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}
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}
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