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WikiLambda Vue interface module for selecting a page language.
@copyright 2020– Abstract Wikipedia team; see AUTHORS.txt
@license MIT
-->
<template>
<div
ref="languageSelector"
class="ext-wikilambda-language-selector"
>
<cdx-button
weight="quiet"
aria-label="Toggle"
class="ext-wikilambda-language-selector__trigger"
@click="openLanguageSelector"
>
<cdx-icon :icon="icons.cdxIconLanguage"></cdx-icon>
{{ selectedLanguageLabel }}
</cdx-button>
<div
ref="languageSelectorDropdown"
class="ext-wikilambda-language-selector__dropdown"
>
<cdx-lookup
ref="languageSelectorLookup"
v-model:input-value="inputValue"
class="ext-wikilambda-language-selector__lookup"
:selected="selectedLanguage"
:menu-items="lookupResults"
:start-icon="icons.cdxIconSearch"
:placeholder="selectLanguagePlaceholder"
@update:input-value="onInput"
@update:selected="onSelect"
></cdx-lookup>
</div>
</div>
</template>
<script>
const { defineComponent } = require( 'vue' );
const { CdxButton, CdxIcon, CdxLookup } = require( '../../codex.js' );
const icons = require( '../../lib/icons.json' );
module.exports = exports = defineComponent( {
name: 'wl-language-selector',
components: {
'cdx-button': CdxButton,
'cdx-icon': CdxIcon,
'cdx-lookup': CdxLookup
},
data: function () {
return {
icons: icons,
inputValue: '',
lookupDelayTimer: null,
lookupDelayMs: 300,
lookupResults: [],
maxItems: 10,
selectedLanguage: null
};
},
computed: {
/**
* Returns the language iso code for the current selected language.
*
* @return {string}
*/
selectedLanguageCode: function () {
return mw.config.get( 'wgUserLanguage' );
},
/**
* Returns the language name for the current selected language.
*
* @return {string}
*/
selectedLanguageLabel: function () {
return mw.config.get( 'wgUserLanguageName' );
},
/**
* Returns the placeholder text for the global language
* selector
*
* @return {string}
*/
selectLanguagePlaceholder: function () {
return this.$i18n( 'wikilambda-about-widget-search-language-placeholder' ).text();
},
/**
* Returns the current Uri path
*
* @return {string}
*/
currentPath: function () {
return mw.Uri().path;
},
/**
* Returns whether the current path is a wikilambda
* /view/<lang>/<zid> content path
*
* @return {boolean}
*/
isViewPath: function () {
return /^\/view\/.*\/.*$/.test( this.currentPath );
}
},
methods: {
/**
* Triggers the language lookup and redirects to the
* new language page for the given language code
*
* @param {string} input
*/
onInput: function ( input ) {
// If empty input, clear and exit
if ( !input ) {
this.lookupResults = [];
this.inputValue = '';
return;
}
// Just search if more than one characters
if ( input.length < 2 ) {
return;
}
// Search after 300 ms
clearTimeout( this.lookupDelayTimer );
this.lookupDelayTimer = setTimeout( () => {
this.fetchLookupResults( input );
}, this.lookupDelayMs );
},
/**
* Performs the languageinfo fetch and filters
* the returned results for the lookup component
*/
fetchLookupResults: function () {
const api = new mw.Api();
api.get( {
action: 'query',
format: 'json',
uselang: this.selectedLanguageCode,
meta: 'languageinfo',
formatversion: '2',
liprop: 'code|name|autonym'
} ).then( ( data ) => {
if ( ( 'query' in data ) && ( 'languageinfo' in data.query ) ) {
// Filter items that match the input substring
const matchedLangs = Object.keys( data.query.languageinfo )
.map( ( key ) => data.query.languageinfo[ key ] )
.filter( ( result ) => result.name.toLowerCase().includes( this.inputValue.toLowerCase() ) ||
result.autonym.toLowerCase().includes( this.inputValue.toLowerCase() ) ||
result.code.toLowerCase().includes( this.inputValue.toLowerCase() ) );
// Limit lookup reults to maxItems
this.setLookupResults( matchedLangs.slice( 0, this.maxItems ) );
}
} );
},
/**
* Sets the menu items for the lookup component
* with the filtered results
*
* @param {Array} results
*/
setLookupResults: function ( results ) {
this.lookupResults = [];
// Update lookupResults list
if ( results && results.length > 0 ) {
results.forEach( ( result ) => {
const value = result.code;
const label = result.name;
this.lookupResults.push( { value, label } );
} );
}
},
/**
* Returns the new Uri path given a selected language code
*
* @param {string} languageCode
* @return {string}
*/
getNewLanguagePath: function ( languageCode ) {
// Either we are in /view/<lang>/zid and replace the lang url section...
if ( this.isViewPath ) {
const pathParts = this.currentPath.split( '/' );
pathParts[ 2 ] = languageCode;
return pathParts.join( '/' );
}
// ... or we have to use mw.Uri.extend to set or replace uselang=lang
const uri = mw.Uri().extend( { uselang: languageCode } );
return uri.toString();
},
/**
* Redirects to the current page in the specified language
*
* @param {string} languageCode
*/
redirectToLanguagePage: function ( languageCode ) {
const targetUrl = this.getNewLanguagePath( languageCode );
window.location.href = targetUrl;
},
/**
* On language selection, we find out the language Code that coresponds
* to the selected Zid, we fetch it if it's still not available in the
* store, and once we have it, we navigate to the new page
*
* @param {string} languageCode
*/
onSelect: function ( languageCode ) {
// T374246: update:selected events are emitted with null value
// whenever input changes, so we need to exit early whenever
// selected value is null, instead of setting the value to empty
// for now. When Codex fixes this issue, we'll be able to remove
// the following lines and restore the clear behavior.
if ( languageCode === null ) {
return;
}
this.closeLanguageSelector();
// If the language Zid is empty or the same as the current one, we pass
if ( !languageCode || ( this.selectedLanguageCode === languageCode ) ) {
return;
}
// We make sure that we know the corresponding language code before navigating out
this.redirectToLanguagePage( languageCode );
},
/**
* Closes the language selector dropdown
*/
closeLanguageSelector: function () {
// Hide dropdown
const dropdown = this.$refs.languageSelectorDropdown;
$( dropdown ).removeClass( 'ext-wikilambda-language-selector__dropdown--visible' );
},
/**
* Opens the language selector dropdown
*/
openLanguageSelector: function () {
// Display dropdown
const dropdown = this.$refs.languageSelectorDropdown;
$( dropdown ).addClass( 'ext-wikilambda-language-selector__dropdown--visible' );
// Focus selector
// eslint-disable-next-line no-jquery/variable-pattern
const lookup = this.$refs.languageSelectorLookup.$el;
try {
// Get input element from cdx-lookup->cdx-text-input->input
// Wrap in try catch to avoid throwing errors in case of codex changes
const input = lookup.firstChild.firstChild;
input.focus();
} catch ( e ) {
return;
}
},
/**
* Event handler to close the language selector
* dropdown if user clicks outside of the language
* selector section
*
* @param {Object} e
*/
handleClick: function ( e ) {
const parent = this.$refs.languageSelector;
if ( e.target !== parent && !parent.contains( e.target ) ) {
this.closeLanguageSelector();
}
}
},
mounted: function () {
window.addEventListener( 'click', this.handleClick );
},
beforeUnmount: function () {
window.removeEventListener( 'click', this.handleClick );
}
} );
</script>
<style lang="less">
.ext-wikilambda-language-selector {
position: relative;
&__dropdown {
position: absolute;
right: 0;
display: none;
&--visible {
display: block;
}
}
}
</style>
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