BookStack Code Mirror - bookstack/blob - resources/js/components/auto-suggest.js

   1 import {escapeHtml} from '../services/util';
   2 import {onChildEvent} from '../services/dom';
   3 import {Component} from './component';
   4 import {KeyboardNavigationHandler} from '../services/keyboard-navigation';
   5
   6 const ajaxCache = {};
   7
   8 /**
   9  * AutoSuggest
  10  */
  11 export class AutoSuggest extends Component {
  12
  13     setup() {
  14         this.parent = this.$el.parentElement;
  15         this.container = this.$el;
  16         this.type = this.$opts.type;
  17         this.url = this.$opts.url;
  18         this.input = this.$refs.input;
  19         this.list = this.$refs.list;
  20
  21         this.lastPopulated = 0;
  22         this.setupListeners();
  23     }
  24
  25     setupListeners() {
  26         const navHandler = new KeyboardNavigationHandler(
  27             this.list,
  28             () => {
  29                 this.input.focus();
  30                 setTimeout(() => this.hideSuggestions(), 1);
  31             },
  32             event => {
  33                 event.preventDefault();
  34                 this.selectSuggestion(event.target.textContent);
  35             },
  36         );
  37         navHandler.shareHandlingToEl(this.input);
  38
  39         onChildEvent(this.list, '.text-item', 'click', (event, el) => {
  40             this.selectSuggestion(el.textContent);
  41         });
  42
  43         this.input.addEventListener('input', this.requestSuggestions.bind(this));
  44         this.input.addEventListener('focus', this.requestSuggestions.bind(this));
  45         this.input.addEventListener('blur', this.hideSuggestionsIfFocusedLost.bind(this));
  46         this.input.addEventListener('keydown', event => {
  47             if (event.key === 'Tab') {
  48                 this.hideSuggestions();
  49             }
  50         });
  51     }
  52
  53     selectSuggestion(value) {
  54         this.input.value = value;
  55         this.lastPopulated = Date.now();
  56         this.input.focus();
  57         this.input.dispatchEvent(new Event('input', {bubbles: true}));
  58         this.input.dispatchEvent(new Event('change', {bubbles: true}));
  59         this.hideSuggestions();
  60     }
  61
  62     async requestSuggestions() {
  63         if (Date.now() - this.lastPopulated < 50) {
  64             return;
  65         }
  66
  67         const nameFilter = this.getNameFilterIfNeeded();
  68         const search = this.input.value.toLowerCase();
  69         const suggestions = await this.loadSuggestions(search, nameFilter);
  70
  71         const toShow = suggestions.filter(val => search === '' || val.toLowerCase().startsWith(search)).slice(0, 10);
  72
  73         this.displaySuggestions(toShow);
  74     }
  75
  76     getNameFilterIfNeeded() {
  77         if (this.type !== 'value') return null;
  78         return this.parent.querySelector('input').value;
  79     }
  80
  81     /**
  82      * @param {String} search
  83      * @param {String|null} nameFilter
  84      * @returns {Promise<Object|String|*>}
  85      */
  86     async loadSuggestions(search, nameFilter = null) {
  87         // Truncate search to prevent over numerous lookups
  88         search = search.slice(0, 4);
  89
  90         const params = {search, name: nameFilter};
  91         const cacheKey = `${this.url}:${JSON.stringify(params)}`;
  92
  93         if (ajaxCache[cacheKey]) {
  94             return ajaxCache[cacheKey];
  95         }
  96
  97         const resp = await window.$http.get(this.url, params);
  98         ajaxCache[cacheKey] = resp.data;
  99         return resp.data;
 100     }
 101
 102     /**
 103      * @param {String[]} suggestions
 104      */
 105     displaySuggestions(suggestions) {
 106         if (suggestions.length === 0) {
 107             this.hideSuggestions();
 108             return;
 109         }
 110
 111         // This used to use <button>s but was changed to div elements since Safari would not focus on buttons
 112         // on which causes a range of other complexities related to focus handling.
 113         this.list.innerHTML = suggestions.map(value => `<li><div tabindex="0" class="text-item">${escapeHtml(value)}</div></li>`).join('');
 114         this.list.style.display = 'block';
 115         for (const button of this.list.querySelectorAll('.text-item')) {
 116             button.addEventListener('blur', this.hideSuggestionsIfFocusedLost.bind(this));
 117         }
 118     }
 119
 120     hideSuggestions() {
 121         this.list.style.display = 'none';
 122     }
 123
 124     hideSuggestionsIfFocusedLost(event) {
 125         if (!this.container.contains(event.relatedTarget)) {
 126             this.hideSuggestions();
 127         }
 128     }
 129
 130 }