152 lines
3.7 KiB
Svelte
152 lines
3.7 KiB
Svelte
<script>
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export let id;
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export let name;
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export let value;
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export let tags;
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let isFocus = false;
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let isOpen = false;
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let input = null;
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let suggestions = [];
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let selectedIndex = 0;
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function handleFocus() {
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isFocus = true;
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}
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function handleBlur() {
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isFocus = false;
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close();
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}
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function handleInput(e) {
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input = e.target;
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const word = getCurrentWord();
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suggestions = word ? tags.filter(tag => tag.indexOf(word) === 0) : [];
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if (word && suggestions.length > 0) {
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open();
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} else {
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close();
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}
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}
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function handleKeyDown(e) {
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if (isOpen && (e.keyCode === 13 || e.keyCode === 9)) {
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const suggestion = suggestions[selectedIndex];
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complete(suggestion);
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e.preventDefault();
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}
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if (e.keyCode === 27) {
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close();
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e.preventDefault();
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}
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if (e.keyCode === 38) {
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updateSelection(-1);
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e.preventDefault();
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}
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if (e.keyCode === 40) {
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updateSelection(1);
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e.preventDefault();
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}
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}
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function open() {
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isOpen = true;
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selectedIndex = 0;
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}
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function close() {
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isOpen = false;
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suggestions = [];
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selectedIndex = 0;
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}
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function complete(suggestion) {
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const bounds = getCurrentWordBounds(input);
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const value = input.value;
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input.value = value.substring(0, bounds.start) + suggestion + value.substring(bounds.end);
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close();
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}
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function getCurrentWordBounds() {
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const text = input.value;
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const end = input.selectionStart;
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let start = end;
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let currentChar = text.charAt(start - 1);
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while (currentChar && currentChar !== ' ' && start > 0) {
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start--;
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currentChar = text.charAt(start - 1);
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}
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return {start, end};
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}
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function getCurrentWord() {
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const bounds = getCurrentWordBounds(input);
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return input.value.substring(bounds.start, bounds.end);
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}
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function updateSelection(dir) {
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const length = suggestions.length;
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let newIndex = selectedIndex + dir;
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if (newIndex < 0) newIndex = Math.max(length - 1, 0);
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if (newIndex >= length) newIndex = 0;
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selectedIndex = newIndex;
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}
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</script>
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<div class="form-autocomplete">
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<!-- autocomplete input container -->
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<div class="form-autocomplete-input form-input" class:is-focused={isFocus}>
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<!-- autocomplete real input box -->
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<input id="{id}" name="{name}" value="{value ||''}"
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class="form-input" type="text" autocomplete="off"
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on:input={handleInput} on:keydown={handleKeyDown}
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on:focus={handleFocus} on:blur={handleBlur}>
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</div>
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<!-- autocomplete suggestion list -->
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<ul class="menu" class:open={isOpen && suggestions.length > 0}>
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<!-- menu list items -->
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{#each suggestions as tag,i}
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<li class="menu-item" class:selected={selectedIndex === i}>
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<a href="#" on:mousedown|preventDefault={() => complete(tag)}>
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<div class="tile tile-centered">
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<div class="tile-content">
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{tag}
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</div>
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</div>
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</a>
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</li>
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{/each}
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</ul>
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</div>
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<style>
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.menu {
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display: none;
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max-height: 200px;
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overflow: auto;
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}
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.menu.open {
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display: block;
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}
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/* TODO: Should be read from theme */
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.menu-item.selected > a {
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background: #f1f1fc;
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color: #5755d9;
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}
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</style> |