2019-12-03 22:00:21 +00:00
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import React, {useState, useRef} from 'react';
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2019-12-04 23:54:44 +00:00
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import PropTypes from 'prop-types';
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import {Term} from '../data/model.js';
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2019-12-04 22:59:52 +00:00
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import * as fuzzy from '../data/fuzzy.js';
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import * as util from '../util.js';
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2019-12-03 22:00:21 +00:00
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/**
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* Codes des touches du clavier par nom.
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*/
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const keys = Object.assign(Object.create(null), {
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'backspace': 8,
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'enter': 13,
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'left': 37,
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'up': 38,
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'right': 39,
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'down': 40,
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});
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/**
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* Zone de saisie des termes de recherche.
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*
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2019-12-05 02:24:21 +00:00
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* @prop query Ensemble de termes déjà dans la requête.
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2019-12-05 02:46:57 +00:00
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* @prop addQueryTerm Fonction de rappel pour ajouter un terme à la requête.
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* @prop removeQueryTerm Fonction de rappel pour ôter un terme de la requête.
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* @prop availableTerms Termes pouvant être ajoutés par l’utilisateur.
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2019-12-03 22:00:21 +00:00
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*/
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2019-12-05 02:46:57 +00:00
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const TermInput = ({
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query,
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addQueryTerm,
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removeQueryTerm,
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availableTerms,
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}) =>
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2019-12-03 22:00:21 +00:00
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{
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// Valeur actuellement saisie dans le champ de recherche de termes
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const [value, setValue] = useState('');
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// Liste des termes suggérés par autocomplétion
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const {
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list: suggestions,
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setList: setSuggestions,
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focus: focusedSuggestion,
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setFocus: setFocusedSuggestion,
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} = util.useFocusableList();
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// Référence au champ de saisie
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const inputRef = useRef(null);
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/**
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* Valide l’entrée courante en l’ajoutant comme terme de la requête.
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*
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* @param term Terme à ajouter dans la requête.
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*/
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const finalizeInput = term =>
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{
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addQueryTerm(term);
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setValue('');
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setSuggestions([]);
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if (inputRef.current !== null)
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{
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inputRef.current.focus();
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}
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};
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/**
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* Gère l’appui sur une touche dans le champ de saisie.
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*
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* @param ev Informations sur l’événement d’appui.
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*/
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const handleInputKeyDown = ev =>
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{
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if (ev.keyCode === keys.enter && value)
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{
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// Touche Entrée : ajout de la suggestion ayant le focus
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ev.preventDefault();
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if (focusedSuggestion < suggestions.length)
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{
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finalizeInput(suggestions[focusedSuggestion]);
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}
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}
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else if (ev.keyCode === keys.backspace && !value)
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{
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// Touche Retour alors que le champ de saisie est vide :
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// retrait du dernier terme de la requête
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ev.preventDefault();
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removeQueryTerm(query.length - 1);
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}
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else if (ev.keyCode === keys.up)
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{
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// Touche Haut : focus de la suggestion précédente
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ev.preventDefault();
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setFocusedSuggestion(focusedSuggestion - 1);
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}
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else if (ev.keyCode === keys.down)
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{
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// Touche Bas : focus de la suggestion suivante
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ev.preventDefault();
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setFocusedSuggestion(focusedSuggestion + 1);
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}
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};
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/**
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* Gère la modification du contenu du champ de saisie.
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*
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* @param ev Informations sur l’événement de modification.
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*/
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const handleInputChange = ev =>
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{
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const nextValue = ev.target.value;
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setValue(nextValue);
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if (nextValue.length === 0)
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{
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// On ne fait pas de suggestion si la valeur saisie est trop courte
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setSuggestions([]);
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}
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else
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{
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// Filtre les termes correspondant à la saisie
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setSuggestions(fuzzy.filterTerms(nextValue, availableTerms));
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}
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};
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return (
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<div className="TermInput">
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{query.map((term, index) =>
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<span
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key={term.id}
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className="TermInput_queryTerm"
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title="Cliquez pour retirer ce terme de la recherche"
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onClick={removeQueryTerm.bind(null, index)}
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>
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{term.name}
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</span>
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)}
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<input
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autoFocus={true}
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type="text" className="TermInput_input"
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placeholder="Rechercher un symptôme, un signe ou une maladie…"
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value={value} ref={inputRef}
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onChange={handleInputChange}
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onKeyDown={handleInputKeyDown} />
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<ul className="TermInput_suggestions">
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{suggestions.map((suggestion, index) =>
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<li
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key={suggestion.id}
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className={[
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'TermInput_suggestion',
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index === focusedSuggestion
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? 'TermInput_suggestion-focus'
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: '',
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].join(' ')}
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onMouseEnter={setFocusedSuggestion.bind(null, index)}
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onClick={finalizeInput.bind(null, suggestion)}
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title="Cliquez pour ajouter ce terme à la recherche"
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>
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{suggestion.name}
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{suggestion.alias.length >= 1 ? (
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<span
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className="TermInput_suggestionAlias"
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title={
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(suggestion.alias.length >= 2
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? 'Autres noms : '
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: 'Autre nom : ')
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+ suggestion.alias.join(', ')
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}
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>
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{suggestion.alias.join(', ')}
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</span>
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) : null}
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</li>
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)}
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</ul>
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</div>
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);
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};
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TermInput.propTypes = {
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query: PropTypes.arrayOf(Term).isRequired,
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addQueryTerm: PropTypes.func.isRequired,
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removeQueryTerm: PropTypes.func.isRequired,
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availableTerms: PropTypes.arrayOf(Term).isRequired,
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};
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2019-12-03 22:00:21 +00:00
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export default TermInput;
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