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picker.js
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picker.js
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import Keyboard from '../modules/keyboard';
import DropdownIcon from '../assets/icons/dropdown.svg';
let OPTIONS_ID = 0;
function toggleAriaAttribute(element, attribute) {
element.setAttribute(attribute, !(element.getAttribute(attribute) === 'true'));
}
class Picker {
constructor(select) {
this.select = select;
this.container = document.createElement('span');
this.buildPicker();
this.select.style.display = 'none';
this.select.parentNode.insertBefore(this.container, this.select);
this.label.addEventListener('mousedown', () => {
this.togglePicker();
});
this.label.addEventListener('keydown', (event) => {
switch(event.keyCode) {
// Allows the "Enter" key to open the picker
case Keyboard.keys.ENTER:
this.togglePicker();
break;
// Allows the "Escape" key to close the picker
case Keyboard.keys.ESCAPE:
this.escape();
event.preventDefault();
break;
default:
}
});
this.select.addEventListener('change', this.update.bind(this));
}
togglePicker() {
this.container.classList.toggle('ql-expanded');
// Toggle aria-expanded and aria-hidden to make the picker accessible
toggleAriaAttribute(this.label, 'aria-expanded');
toggleAriaAttribute(this.options, 'aria-hidden');
}
buildItem(option) {
let item = document.createElement('span');
item.tabIndex = '0';
item.setAttribute('role', 'button');
item.classList.add('ql-picker-item');
if (option.hasAttribute('value')) {
item.setAttribute('data-value', option.getAttribute('value'));
}
if (option.textContent) {
item.setAttribute('data-label', option.textContent);
}
item.addEventListener('click', () => {
this.selectItem(item, true);
});
item.addEventListener('keydown', (event) => {
switch(event.keyCode) {
// Allows the "Enter" key to select an item
case Keyboard.keys.ENTER:
this.selectItem(item, true);
event.preventDefault();
break;
// Allows the "Escape" key to close the picker
case Keyboard.keys.ESCAPE:
this.escape();
event.preventDefault();
break;
default:
}
});
return item;
}
buildLabel() {
let label = document.createElement('span');
label.classList.add('ql-picker-label');
label.innerHTML = DropdownIcon;
label.tabIndex = '0';
label.setAttribute('role', 'button');
label.setAttribute('aria-expanded', 'false');
this.container.appendChild(label);
return label;
}
buildOptions() {
let options = document.createElement('span');
options.classList.add('ql-picker-options');
// Don't want screen readers to read this until options are visible
options.setAttribute('aria-hidden', 'true');
options.tabIndex = '-1';
// Need a unique id for aria-controls
options.id = `ql-picker-options-${OPTIONS_ID}`;
OPTIONS_ID += 1;
this.label.setAttribute('aria-controls', options.id);
this.options = options;
[].slice.call(this.select.options).forEach((option) => {
let item = this.buildItem(option);
options.appendChild(item);
if (option.selected === true) {
this.selectItem(item);
}
});
this.container.appendChild(options);
}
buildPicker() {
[].slice.call(this.select.attributes).forEach((item) => {
this.container.setAttribute(item.name, item.value);
});
this.container.classList.add('ql-picker');
this.label = this.buildLabel();
this.buildOptions();
}
escape() {
// Close menu and return focus to trigger label
this.close();
// Need setTimeout for accessibility to ensure that the browser executes
// focus on the next process thread and after any DOM content changes
setTimeout(() => this.label.focus(), 1);
}
close() {
this.container.classList.remove('ql-expanded');
this.label.setAttribute('aria-expanded', 'false');
this.options.setAttribute('aria-hidden', 'true');
}
selectItem(item, trigger = false) {
let selected = this.container.querySelector('.ql-selected');
if (item === selected) return;
if (selected != null) {
selected.classList.remove('ql-selected');
}
if (item == null) return;
item.classList.add('ql-selected');
this.select.selectedIndex = [].indexOf.call(item.parentNode.children, item);
if (item.hasAttribute('data-value')) {
this.label.setAttribute('data-value', item.getAttribute('data-value'));
} else {
this.label.removeAttribute('data-value');
}
if (item.hasAttribute('data-label')) {
this.label.setAttribute('data-label', item.getAttribute('data-label'));
} else {
this.label.removeAttribute('data-label');
}
if (trigger) {
if (typeof Event === 'function') {
this.select.dispatchEvent(new Event('change'));
} else if (typeof Event === 'object') { // IE11
let event = document.createEvent('Event');
event.initEvent('change', true, true);
this.select.dispatchEvent(event);
}
this.close();
}
}
update() {
let option;
if (this.select.selectedIndex > -1) {
let item = this.container.querySelector('.ql-picker-options').children[this.select.selectedIndex];
option = this.select.options[this.select.selectedIndex];
this.selectItem(item);
} else {
this.selectItem(null);
}
let isActive = option != null && option !== this.select.querySelector('option[selected]');
this.label.classList.toggle('ql-active', isActive);
}
}
export default Picker;