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autocomplete.es.js
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autocomplete.es.js
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/**
* Copyright (c) 2016 Denis Taran
*
* Homepage: https://smartscheduling.com/en/documentation/autocomplete
* Source: https://github.com/denis-taran/autocomplete
*
* MIT License
*/
function autocomplete(settings) {
// just an alias to minimize JS file size
var doc = document;
var container = settings.container || doc.createElement('div');
var preventSubmit = settings.preventSubmit || 0 /* Never */;
container.id = container.id || 'autocomplete-' + uid();
var containerStyle = container.style;
var debounceWaitMs = settings.debounceWaitMs || 0;
var disableAutoSelect = settings.disableAutoSelect || false;
var customContainerParent = container.parentElement;
var items = [];
var inputValue = '';
var minLen = 2;
var showOnFocus = settings.showOnFocus;
var selected;
var fetchCounter = 0;
var debounceTimer;
var destroyed = false;
// Fixes #104: autocomplete selection is broken on Firefox for Android
var suppressAutocomplete = false;
if (settings.minLength !== undefined) {
minLen = settings.minLength;
}
if (!settings.input) {
throw new Error('input undefined');
}
var input = settings.input;
container.className = [container.className, 'autocomplete', settings.className || ''].join(' ').trim();
container.setAttribute('role', 'listbox');
input.setAttribute('role', 'combobox');
input.setAttribute('aria-expanded', 'false');
input.setAttribute('aria-autocomplete', 'list');
input.setAttribute('aria-controls', container.id);
input.setAttribute('aria-owns', container.id);
input.setAttribute('aria-activedescendant', '');
input.setAttribute('aria-haspopup', 'listbox');
// IOS implementation for fixed positioning has many bugs, so we will use absolute positioning
containerStyle.position = 'absolute';
/**
* Generate a very complex textual ID that greatly reduces the chance of a collision with another ID or text.
*/
function uid() {
return Date.now().toString(36) + Math.random().toString(36).substring(2);
}
/**
* Detach the container from DOM
*/
function detach() {
var parent = container.parentNode;
if (parent) {
parent.removeChild(container);
}
}
/**
* Clear debouncing timer if assigned
*/
function clearDebounceTimer() {
if (debounceTimer) {
window.clearTimeout(debounceTimer);
}
}
/**
* Attach the container to DOM
*/
function attach() {
if (!container.parentNode) {
(customContainerParent || doc.body).appendChild(container);
}
}
/**
* Check if container for autocomplete is displayed
*/
function containerDisplayed() {
return !!container.parentNode;
}
/**
* Clear autocomplete state and hide container
*/
function clear() {
// prevent the update call if there are pending AJAX requests
fetchCounter++;
items = [];
inputValue = '';
selected = undefined;
input.setAttribute('aria-activedescendant', '');
input.setAttribute('aria-expanded', 'false');
detach();
}
/**
* Update autocomplete position
*/
function updatePosition() {
if (!containerDisplayed()) {
return;
}
input.setAttribute('aria-expanded', 'true');
containerStyle.height = 'auto';
containerStyle.width = input.offsetWidth + 'px';
var maxHeight = 0;
var inputRect;
function calc() {
var docEl = doc.documentElement;
var clientTop = docEl.clientTop || doc.body.clientTop || 0;
var clientLeft = docEl.clientLeft || doc.body.clientLeft || 0;
var scrollTop = window.pageYOffset || docEl.scrollTop;
var scrollLeft = window.pageXOffset || docEl.scrollLeft;
inputRect = input.getBoundingClientRect();
var top = inputRect.top + input.offsetHeight + scrollTop - clientTop;
var left = inputRect.left + scrollLeft - clientLeft;
containerStyle.top = top + 'px';
containerStyle.left = left + 'px';
maxHeight = window.innerHeight - (inputRect.top + input.offsetHeight);
if (maxHeight < 0) {
maxHeight = 0;
}
containerStyle.top = top + 'px';
containerStyle.bottom = '';
containerStyle.left = left + 'px';
containerStyle.maxHeight = maxHeight + 'px';
}
// the calc method must be called twice, otherwise the calculation may be wrong on resize event (chrome browser)
calc();
calc();
if (settings.customize && inputRect) {
settings.customize(input, inputRect, container, maxHeight);
}
}
/**
* Redraw the autocomplete div element with suggestions
*/
function update() {
container.textContent = '';
input.setAttribute('aria-activedescendant', '');
// function for rendering autocomplete suggestions
var render = function (item, _, __) {
var itemElement = doc.createElement('div');
itemElement.textContent = item.label || '';
return itemElement;
};
if (settings.render) {
render = settings.render;
}
// function to render autocomplete groups
var renderGroup = function (groupName, _) {
var groupDiv = doc.createElement('div');
groupDiv.textContent = groupName;
return groupDiv;
};
if (settings.renderGroup) {
renderGroup = settings.renderGroup;
}
var fragment = doc.createDocumentFragment();
var prevGroup = uid();
items.forEach(function (item, index) {
if (item.group && item.group !== prevGroup) {
prevGroup = item.group;
var groupDiv = renderGroup(item.group, inputValue);
if (groupDiv) {
groupDiv.className += ' group';
fragment.appendChild(groupDiv);
}
}
var div = render(item, inputValue, index);
if (div) {
div.id = container.id + "_" + index;
div.setAttribute('role', 'option');
div.addEventListener('click', function (ev) {
suppressAutocomplete = true;
try {
settings.onSelect(item, input);
}
finally {
suppressAutocomplete = false;
}
clear();
ev.preventDefault();
ev.stopPropagation();
});
if (item === selected) {
div.className += ' selected';
div.setAttribute('aria-selected', 'true');
input.setAttribute('aria-activedescendant', div.id);
}
fragment.appendChild(div);
}
});
container.appendChild(fragment);
if (items.length < 1) {
if (settings.emptyMsg) {
var empty = doc.createElement('div');
empty.id = container.id + "_" + uid();
empty.className = 'empty';
empty.textContent = settings.emptyMsg;
container.appendChild(empty);
input.setAttribute('aria-activedescendant', empty.id);
}
else {
clear();
return;
}
}
attach();
updatePosition();
updateScroll();
}
function updateIfDisplayed() {
if (containerDisplayed()) {
update();
}
}
function resizeEventHandler() {
updateIfDisplayed();
}
function scrollEventHandler(e) {
if (e.target !== container) {
updateIfDisplayed();
}
else {
e.preventDefault();
}
}
function inputEventHandler() {
if (!suppressAutocomplete) {
fetch(0 /* Keyboard */);
}
}
/**
* Automatically move scroll bar if selected item is not visible
*/
function updateScroll() {
var elements = container.getElementsByClassName('selected');
if (elements.length > 0) {
var element = elements[0];
// make group visible
var previous = element.previousElementSibling;
if (previous && previous.className.indexOf('group') !== -1 && !previous.previousElementSibling) {
element = previous;
}
if (element.offsetTop < container.scrollTop) {
container.scrollTop = element.offsetTop;
}
else {
var selectBottom = element.offsetTop + element.offsetHeight;
var containerBottom = container.scrollTop + container.offsetHeight;
if (selectBottom > containerBottom) {
container.scrollTop += selectBottom - containerBottom;
}
}
}
}
function selectPreviousSuggestion() {
var index = items.indexOf(selected);
selected = index === -1
? undefined
: items[(index + items.length - 1) % items.length];
updateSelectedSuggestion(index);
}
function selectNextSuggestion() {
var index = items.indexOf(selected);
selected = items.length < 1
? undefined
: index === -1
? items[0]
: items[(index + 1) % items.length];
updateSelectedSuggestion(index);
}
function updateSelectedSuggestion(index) {
if (items.length > 0) {
unselectSuggestion(index);
selectSuggestion(items.indexOf(selected));
updateScroll();
}
}
function selectSuggestion(index) {
var element = doc.getElementById(container.id + "_" + index);
if (element) {
element.classList.add('selected');
element.setAttribute('aria-selected', 'true');
input.setAttribute('aria-activedescendant', element.id);
}
}
function unselectSuggestion(index) {
var element = doc.getElementById(container.id + "_" + index);
if (element) {
element.classList.remove('selected');
element.removeAttribute('aria-selected');
input.removeAttribute('aria-activedescendant');
}
}
function handleArrowAndEscapeKeys(ev, key) {
var containerIsDisplayed = containerDisplayed();
if (key === 'Escape') {
clear();
}
else {
if (!containerIsDisplayed || items.length < 1) {
return;
}
key === 'ArrowUp'
? selectPreviousSuggestion()
: selectNextSuggestion();
}
ev.preventDefault();
if (containerIsDisplayed) {
ev.stopPropagation();
}
}
function handleEnterKey(ev) {
if (selected) {
if (preventSubmit === 2 /* OnSelect */) {
ev.preventDefault();
}
suppressAutocomplete = true;
try {
settings.onSelect(selected, input);
}
finally {
suppressAutocomplete = false;
}
clear();
}
if (preventSubmit === 1 /* Always */) {
ev.preventDefault();
}
}
function keydownEventHandler(ev) {
var key = ev.key;
switch (key) {
case 'ArrowUp':
case 'ArrowDown':
case 'Escape':
handleArrowAndEscapeKeys(ev, key);
break;
case 'Enter':
handleEnterKey(ev);
break;
}
}
function focusEventHandler() {
if (showOnFocus) {
fetch(1 /* Focus */);
}
}
function fetch(trigger) {
if (input.value.length >= minLen || trigger === 1 /* Focus */) {
clearDebounceTimer();
debounceTimer = window.setTimeout(function () { return startFetch(input.value, trigger, input.selectionStart || 0); }, trigger === 0 /* Keyboard */ || trigger === 2 /* Mouse */ ? debounceWaitMs : 0);
}
else {
clear();
}
}
function startFetch(inputText, trigger, cursorPos) {
if (destroyed)
return;
var savedFetchCounter = ++fetchCounter;
settings.fetch(inputText, function (elements) {
if (fetchCounter === savedFetchCounter && elements) {
items = elements;
inputValue = inputText;
selected = (items.length < 1 || disableAutoSelect) ? undefined : items[0];
update();
}
}, trigger, cursorPos);
}
function keyupEventHandler(e) {
if (settings.keyup) {
settings.keyup({
event: e,
fetch: function () { return fetch(0 /* Keyboard */); }
});
return;
}
if (!containerDisplayed() && e.key === 'ArrowDown') {
fetch(0 /* Keyboard */);
}
}
function clickEventHandler(e) {
settings.click && settings.click({
event: e,
fetch: function () { return fetch(2 /* Mouse */); }
});
}
function blurEventHandler() {
// when an item is selected by mouse click, the blur event will be initiated before the click event and remove DOM elements,
// so that the click event will never be triggered. In order to avoid this issue, DOM removal should be delayed.
setTimeout(function () {
if (doc.activeElement !== input) {
clear();
}
}, 200);
}
function manualFetch() {
startFetch(input.value, 3 /* Manual */, input.selectionStart || 0);
}
/**
* Fixes #26: on long clicks focus will be lost and onSelect method will not be called
*/
container.addEventListener('mousedown', function (evt) {
evt.stopPropagation();
evt.preventDefault();
});
/**
* Fixes #30: autocomplete closes when scrollbar is clicked in IE
* See: https://stackoverflow.com/a/9210267/13172349
*/
container.addEventListener('focus', function () { return input.focus(); });
// If the custom autocomplete container is already appended to the DOM during widget initialization, detach it.
detach();
/**
* This function will remove DOM elements and clear event handlers
*/
function destroy() {
input.removeEventListener('focus', focusEventHandler);
input.removeEventListener('keyup', keyupEventHandler);
input.removeEventListener('click', clickEventHandler);
input.removeEventListener('keydown', keydownEventHandler);
input.removeEventListener('input', inputEventHandler);
input.removeEventListener('blur', blurEventHandler);
window.removeEventListener('resize', resizeEventHandler);
doc.removeEventListener('scroll', scrollEventHandler, true);
input.removeAttribute('role');
input.removeAttribute('aria-expanded');
input.removeAttribute('aria-autocomplete');
input.removeAttribute('aria-controls');
input.removeAttribute('aria-activedescendant');
input.removeAttribute('aria-owns');
input.removeAttribute('aria-haspopup');
clearDebounceTimer();
clear();
destroyed = true;
}
// setup event handlers
input.addEventListener('keyup', keyupEventHandler);
input.addEventListener('click', clickEventHandler);
input.addEventListener('keydown', keydownEventHandler);
input.addEventListener('input', inputEventHandler);
input.addEventListener('blur', blurEventHandler);
input.addEventListener('focus', focusEventHandler);
window.addEventListener('resize', resizeEventHandler);
doc.addEventListener('scroll', scrollEventHandler, true);
return {
destroy: destroy,
fetch: manualFetch
};
}
export default autocomplete;
//# sourceMappingURL=autocomplete.es.js.map