mobius1-selectable

Selectable

Inspired by the jQuery UI Selectable plugin. Functionality and options are identical to the jQuery UI version with some additions and performance enhancements.

Selectable mimics the Windows file / directory behaviour, i.e. click and / or drag to select items, hold CTRL to select multiple or hold SHIFT to select consecutive groups of items.

Demo | Changelog

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Install

Bower

bower install mobius1-selectable --save

npm

npm install mobius1-selectable --save

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Browser

Grab the files from one of the CDNs and include them in your page:

https://unpkg.com/mobius1-selectable@latest/selectable.min.js

//or

https://cdn.jsdelivr.net/npm/mobius1-selectable@latest/selectable.min.js

You can replace latest with the required release number if needed.

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Initialise the plugin:

const selectable = new Selectable(options);

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Options

Option	Type	Default	Required	Effect
filter	string or array	"*"	✔	The elements that can be selected. You can pass either a CSS3 selector string or a collection of nodes.
appendTo	string or object	document.body	✖	The container element to append the lasso to.
tolerance	string	touch	✖	How far the lasso overlaps an element before it's highlighted. "fit" (lasso overlaps the item entirely) or "touch" (lasso overlaps the item by any amount).
autoRefresh	boolean	true	✖	Recalculate the coords of the items. Set to false if you know the selectable items won't move or change size.
lasso	object		✖	Style the lasso. Must be an object of valid CSS declarations. Demo

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Public Methods

destroy()

Destroy the instance. This will return the DOM to it's initial state before initialsing.

init()

Initialise the instance after destroying.

disable()

Disable the instance. Removes all event listeners to prevent further selection / deselection.

enable()

Enable the instance.

update()

Updates the instance.

Can be used if new items are added or old ones removed. All item coords are updated as well.

recalculate()

Recalculates the coords for all valid items.

If the dimensions of the item / items change then call this method otherwise the lasso will not select items correctly.

selectItem(item)

Select an item.

deselectItem(item)

Deselect an item.

selectAll()

Select all valid items.

clear()

Deselects all valid items.

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Events

// Intitialise Selectable
const selectable = new Selectable(options);

// Listen for the 'selectable.XXXX' event
selectable.on('selectable.XXXX', function() {
    // Do something when 'selectable.XXXX' fires
});

• selectable.down fires on mousedown (within container)
• selectable.drag fires when dragging the lasso
• selectable.up fires on mouse up (within container)
• selectable.selected fires on each element selected

/**
 * @param item - the first item selected
 * @return {object}
 */
selectable.on('selectable.down', function(item) {
	// Do something when selectable.down fires
});

/**
 * @param coords - lasso coords (x1, x2, y1, y2)
 * @return {object}
 */
selectable.on('selectable.drag', function(coords) {
	// Do something when selectable.drag fires
});

/**
 * @param selectedItems - returns an array of selected items (objects)
 * @return {array}
 */
selectable.on('selectable.up', function(selectedItems) {
	// Do something when selectable.up fires
});

/**
 * @param item - the selected item (fires for each item that is selected)
 * @return {object}
 */
selectable.on('selectable.selected', function(item) {
	// Do something when selectable.selected fires
});

Note that items returned by these events are objects of the following format:

{
    element: HTMLElement, // the element
    index: Number, // the position of the item in the list
    rect: DOMRect Object, // the element's bounding rects
    startselected: Boolean,
    selected: Boolean, // is the item currently selected
    selecting: Boolean, // is the item currently being selected
    unselecting: Boolean // is the item currently being deselected
}

Copyright © 2017 Karl Saunders | BSD & MIT license