+ ngApp.directive('autosuggestions', ['$http', function($http) {
+ return {
+ restrict: 'A',
+ link: function(scope, elem, attrs) {
+
+ // Local storage for quick caching.
+ const localCache = {};
+
+ // Create suggestion element
+ const suggestionBox = document.createElement('ul');
+ suggestionBox.className = 'suggestion-box';
+ suggestionBox.style.position = 'absolute';
+ suggestionBox.style.display = 'none';
+ const $suggestionBox = $(suggestionBox);
+
+ // General state tracking
+ let isShowing = false;
+ let currentInput = false;
+ let active = 0;
+
+ // Listen to input events on autosuggest fields
+ elem.on('input', '[autosuggest]', function(event) {
+ let $input = $(this);
+ let val = $input.val();
+ let url = $input.attr('autosuggest');
+ // No suggestions until at least 3 chars
+ if (val.length < 3) {
+ if (isShowing) {
+ $suggestionBox.hide();
+ isShowing = false;
+ }
+ return;
+ };
+
+ let suggestionPromise = getSuggestions(val.slice(0, 3), url);
+ suggestionPromise.then((suggestions) => {
+ if (val.length > 2) {
+ suggestions = suggestions.filter((item) => {
+ return item.toLowerCase().indexOf(val.toLowerCase()) !== -1;
+ }).slice(0, 4);
+ displaySuggestions($input, suggestions);
+ }
+ });
+ });
+
+ // Hide autosuggestions when input loses focus.
+ // Slight delay to allow clicks.
+ elem.on('blur', '[autosuggest]', function(event) {
+ setTimeout(() => {
+ $suggestionBox.hide();
+ isShowing = false;
+ }, 200)
+ });
+
+ elem.on('keydown', '[autosuggest]', function (event) {
+ if (!isShowing) return;
+
+ let suggestionElems = suggestionBox.childNodes;
+ let suggestCount = suggestionElems.length;
+
+ // Down arrow
+ if (event.keyCode === 40) {
+ let newActive = (active === suggestCount-1) ? 0 : active + 1;
+ changeActiveTo(newActive, suggestionElems);
+ }
+ // Up arrow
+ else if (event.keyCode === 38) {
+ let newActive = (active === 0) ? suggestCount-1 : active - 1;
+ changeActiveTo(newActive, suggestionElems);
+ }
+ // Enter key
+ else if (event.keyCode === 13) {
+ let text = suggestionElems[active].textContent;
+ currentInput[0].value = text;
+ currentInput.focus();
+ $suggestionBox.hide();
+ isShowing = false;
+ event.preventDefault();
+ return false;
+ }
+ });
+
+ // Change the active suggestion to the given index
+ function changeActiveTo(index, suggestionElems) {
+ suggestionElems[active].className = '';
+ active = index;
+ suggestionElems[active].className = 'active';
+ }
+
+ // Display suggestions on a field
+ let prevSuggestions = [];
+ function displaySuggestions($input, suggestions) {
+
+ // Hide if no suggestions
+ if (suggestions.length === 0) {
+ $suggestionBox.hide();
+ isShowing = false;
+ prevSuggestions = suggestions;
+ return;
+ }
+
+ // Otherwise show and attach to input
+ if (!isShowing) {
+ $suggestionBox.show();
+ isShowing = true;
+ }
+ if ($input !== currentInput) {
+ $suggestionBox.detach();
+ $input.after($suggestionBox);
+ currentInput = $input;
+ }
+
+ // Return if no change
+ if (prevSuggestions.join() === suggestions.join()) {
+ prevSuggestions = suggestions;
+ return;
+ }
+
+ // Build suggestions
+ $suggestionBox[0].innerHTML = '';
+ for (let i = 0; i < suggestions.length; i++) {
+ var suggestion = document.createElement('li');
+ suggestion.textContent = suggestions[i];
+ suggestion.onclick = suggestionClick;
+ if (i === 0) {
+ suggestion.className = 'active'
+ active = 0;
+ };
+ $suggestionBox[0].appendChild(suggestion);
+ }
+
+ prevSuggestions = suggestions;
+ }
+
+ // Suggestion click event
+ function suggestionClick(event) {
+ let text = this.textContent;
+ currentInput[0].value = text;
+ currentInput.focus();
+ $suggestionBox.hide();
+ isShowing = false;
+ };
+
+ // Get suggestions & cache
+ function getSuggestions(input, url) {
+ let searchUrl = url + '?search=' + encodeURIComponent(input);
+
+ // Get from local cache if exists
+ if (localCache[searchUrl]) {
+ return new Promise((resolve, reject) => {
+ resolve(localCache[input]);
+ });
+ }
+
+ return $http.get(searchUrl).then((response) => {
+ localCache[input] = response.data;
+ return response.data;
+ });
+ }
+
+ }
+ }
+ }]);
+};
+
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projects / bookstack / commitdiff