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/**
* @file
* Dropbutton feature.
*/
(function ($, Drupal) {
/**
* A DropButton presents an HTML list as a button with a primary action.
*
* All secondary actions beyond the first in the list are presented in a
* dropdown list accessible through a toggle arrow associated with the button.
*
* @constructor Drupal.DropButton
*
* @param {HTMLElement} dropbutton
* A DOM element.
* @param {object} settings
* A list of options including:
* @param {string} settings.title
* The text inside the toggle link element. This text is hidden
* from visual UAs.
*/
function DropButton(dropbutton, settings) {
// Merge defaults with settings.
const options = $.extend(
{ title: Drupal.t('List additional actions') },
settings,
);
const $dropbutton = $(dropbutton);
/**
* @type {jQuery}
*/
this.$dropbutton = $dropbutton;
/**
* @type {jQuery}
*/
this.$list = $dropbutton.find('.dropbutton');
/**
* Find actions and mark them.
*
* @type {jQuery}
*/
this.$actions = this.$list.find('li').addClass('dropbutton-action');
// Add the special dropdown only if there are hidden actions.
if (this.$actions.length > 1) {
// Identify the first element of the collection.
const $primary = this.$actions.slice(0, 1);
// Identify the secondary actions.
const $secondary = this.$actions.slice(1);
$secondary.addClass('secondary-action');
// Add toggle link.
$primary.after(Drupal.theme('dropbuttonToggle', options));
// Bind mouse events.
this.$dropbutton.addClass('dropbutton-multiple').on({
/**
* Adds a timeout to close the dropdown on mouseleave.
*
* @ignore
*/
'mouseleave.dropbutton': $.proxy(this.hoverOut, this),
/**
* Clears timeout when mouseout of the dropdown.
*
* @ignore
*/
'mouseenter.dropbutton': $.proxy(this.hoverIn, this),
/**
* Similar to mouseleave/mouseenter, but for keyboard navigation.
*
* @ignore
*/
'focusout.dropbutton': $.proxy(this.focusOut, this),
/**
* @ignore
*/
'focusin.dropbutton': $.proxy(this.focusIn, this),
});
} else {
this.$dropbutton.addClass('dropbutton-single');
}
}
/**
* Delegated callback for opening and closing dropbutton secondary actions.
*
* @function Drupal.DropButton~dropbuttonClickHandler
*
* @param {jQuery.Event} e
* The event triggered.
*/
function dropbuttonClickHandler(e) {
e.preventDefault();
$(e.target).closest('.dropbutton-wrapper').toggleClass('open');
}
/**
* Process elements with the .dropbutton class on page load.
*
* @type {Drupal~behavior}
*
* @prop {Drupal~behaviorAttach} attach
* Attaches dropButton behaviors.
*/
Drupal.behaviors.dropButton = {
attach(context, settings) {
const dropbuttons = once('dropbutton', '.dropbutton-wrapper', context);
if (dropbuttons.length) {
// Adds the delegated handler that will toggle dropdowns on click.
const body = once('dropbutton-click', 'body');
if (body.length) {
$(body).on('click', '.dropbutton-toggle', dropbuttonClickHandler);
}
// Initialize all buttons.
dropbuttons.forEach((dropbutton) => {
DropButton.dropbuttons.push(
new DropButton(dropbutton, settings.dropbutton),
);
});
}
},
};
/**
* Extend the DropButton constructor.
*/
$.extend(
DropButton,
/** @lends Drupal.DropButton */ {
/**
* Store all processed DropButtons.
*
* @type {Array.<Drupal.DropButton>}
*/
dropbuttons: [],
},
);
/**
* Extend the DropButton prototype.
*/
$.extend(
DropButton.prototype,
/** @lends Drupal.DropButton# */ {
/**
* Toggle the dropbutton open and closed.
*
* @param {bool} [show]
* Force the dropbutton to open by passing true or to close by
* passing false.
*/
toggle(show) {
const isBool = typeof show === 'boolean';
show = isBool ? show : !this.$dropbutton.hasClass('open');
this.$dropbutton.toggleClass('open', show);
},
/**
* @method
*/
hoverIn() {
// Clear any previous timer we were using.
if (this.timerID) {
window.clearTimeout(this.timerID);
}
},
/**
* @method
*/
hoverOut() {
// Wait half a second before closing.
this.timerID = window.setTimeout($.proxy(this, 'close'), 500);
},
/**
* @method
*/
open() {
this.toggle(true);
},
/**
* @method
*/
close() {
this.toggle(false);
},
/**
* @param {jQuery.Event} e
* The event triggered.
*/
focusOut(e) {
this.hoverOut.call(this, e);
},
/**
* @param {jQuery.Event} e
* The event triggered.
*/
focusIn(e) {
this.hoverIn.call(this, e);
},
},
);
$.extend(
Drupal.theme,
/** @lends Drupal.theme */ {
/**
* A toggle is an interactive element often bound to a click handler.
*
* @param {object} options
* Options object.
* @param {string} [options.title]
* The button text.
*
* @return {string}
* A string representing a DOM fragment.
*/
dropbuttonToggle(options) {
return `<li class="dropbutton-toggle"><button type="button"><span class="dropbutton-arrow"><span class="visually-hidden">${options.title}</span></span></button></li>`;
},
},
);
// Expose constructor in the public space.
Drupal.DropButton = DropButton;
})(jQuery, Drupal);
|
