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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import HandleEventMixin from "../mixins/HandleEventMixin.js";
import ObservedPropertiesMixin from "../mixins/ObservedPropertiesMixin.js";
import RichOption from "./rich-option.js";
/**
* <rich-select>
* <rich-option></rich-option>
* </rich-select>
*
* Note: The only supported way to change the selected option is via the
* `value` setter.
*/
export default class RichSelect extends HandleEventMixin(
ObservedPropertiesMixin(HTMLElement)
) {
static get observedAttributes() {
return ["disabled", "hidden"];
}
constructor() {
super();
this.popupBox = document.createElement("select");
}
connectedCallback() {
// the popupBox element may change in between constructor and being connected
// so wait until connected before listening to events on it
this.popupBox.addEventListener("change", this);
this.appendChild(this.popupBox);
this.render();
}
get selectedOption() {
return this.getOptionByValue(this.value);
}
get selectedRichOption() {
// XXX: Bug 1475684 - This can be removed once `selectedOption` returns a
// RichOption which extends HTMLOptionElement.
return this.querySelector(":scope > .rich-select-selected-option");
}
get value() {
return this.popupBox.value;
}
set value(guid) {
this.popupBox.value = guid;
this.render();
}
getOptionByValue(value) {
return this.popupBox.querySelector(
`:scope > [value="${CSS.escape(value)}"]`
);
}
onChange(event) {
// Since the render function depends on the popupBox's value, we need to
// re-render if the value changes.
this.render();
}
render() {
let selectedRichOption = this.querySelector(
":scope > .rich-select-selected-option"
);
if (selectedRichOption) {
selectedRichOption.remove();
}
if (this.value) {
let optionType = this.getAttribute("option-type");
if (!selectedRichOption || selectedRichOption.localName != optionType) {
selectedRichOption = document.createElement(optionType);
}
let option = this.getOptionByValue(this.value);
let attributeNames = selectedRichOption.constructor.observedAttributes;
for (let attributeName of attributeNames) {
let attributeValue = option.getAttribute(attributeName);
if (attributeValue) {
selectedRichOption.setAttribute(attributeName, attributeValue);
} else {
selectedRichOption.removeAttribute(attributeName);
}
}
} else {
selectedRichOption = new RichOption();
selectedRichOption.textContent = "(None selected)"; // XXX: bug 1473772
}
selectedRichOption.classList.add("rich-select-selected-option");
// Hide the rich-option from a11y tools since the native <select> will
// already provide the selected option label.
selectedRichOption.setAttribute("aria-hidden", "true");
selectedRichOption = this.appendChild(selectedRichOption);
}
}
customElements.define("rich-select", RichSelect);
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