Nestable option for uikit3 sortable

Uses UIkit.mixin to add a nestable option to the uikit3 sortable component.

Demo

See this nestable plugin in action: DEMO.

Installation

yarn add uikit3-nestable

# or 

npm install uikit3-nestable

Usage

With ES6 compatible modules (webpack)

    import UIkit from 'uikit';
    import nestable from 'uikit3-nestable';

    // Add nestable as mixin to the sortable component.
    UIkit.mixin(nestable, 'sortable');

With a global UIkit instance

Include node_moduels/uikit3-nestable/dist/js/nestable.js after UIkit:

    <link rel="stylesheet" href=".../uikit.min.css" />
    <script src=".../uikit.min.js"></script>
    <script src=".../uikit-icons.min.js"></script>
    <script src="..../nestable.js"></script>>

Now you have a new nestable option for your uk-sortable components:

    <div uk-sortable="handle: .uk-sortable-handle; nestable: true"></div>

Styles

In order to make nestable work, you must add at least the following css code:

    /* nested sortable groups indention */            
    .uk-sortable .uk-sortable,
    .uk-sortable-drag .uk-sortable {
        margin-left: 50px;
    }

    /* nested sortable groups inner padding to the parent element */
    .uk-sortable .uk-sortable:not(.uk-sortable-empty),
    .uk-sortable .uk-sortable-drag:not(.uk-sortable-empty) {
        padding-top: 20px;
    }

    /* remove uk-sortable-empty min-height sort nested sortables */
    .uk-sortable .uk-sortable.uk-sortable-empty,
    .uk-sortable-drag .uk-sortable.uk-sortable-empty {
        min-height: 0;
    }

To make it easier to sort, you should make the placeholder visible. Something like this (taken from uikit2):

    /* Custom placeholder styles, makes it easier to see the current position */
    .uk-sortable-placeholder {
        position: relative;
        opacity: 1;
    }

    .uk-sortable-placeholder > * {
        opacity: 0;
    }

    .uk-sortable-placeholder:after {
        content: '';
        position: absolute;
        top: 0;
        bottom: 0;
        left: 0;
        right: 0;
        border: 1px dashed #E5E5E5;
        opacity: 1;
    }

A working example can be found in dist/index.html Please see dist/index.html