Addel : jQuery plugin for Dynamic Addition & Deletion of HTML elements

addel is a simple and lightweight jQuery plugin for powering UIs that enable dynamic addition and deletion of HTML elements, conceived with form elements in mind.

"addel" is short for add-delete and should be pronounced "Adele", just like the singer's name.

..Because it's all in the details, people!

Notable features

Lightweight
Maximum HTML flexibility
Events you can hook on
Declarative control
Keyboard convenience through smart focusing
Customizable animation

Installation

There are multiple options:

Download addel.jquery.js or addel.jquery.min.js
Use Bower: bower install addel --save
Use npm: npm install addel --save
Use yarn: yarn add addel

And include it: <script src="/path/to/file/addel.jquery.min.js"></script>

Initialization

$('.addel-container').addel({     // optional options object });

⚠️ HTML structure and restrictions

<div class="addel-container">     <div class="addel-target">         <button class="addel-del"></button>     </div>     <button class="addel-add"></button> </div>

As per RFC 2119:

.addel-container MUST be the element addel is initialized upon
.addel-container MUST contain everything else: .addel-target, .addel-delete and .addel-add
.addel-target MAY also contain your own element/s, this is after all what we are here for
.addel-delete MUST be .addel-container's and .addel-target's descendant
.addel-add MUST be .addel-container's descendant and MUST NOT be .addel-target's descendant

Note that class names are for reference only and are completely customizable, as described in the options section.

Options

Name	Type	Default	Info
`hide`	`boolean`	`false`	Whether to initially hide the `target` (disables its form elements)
`add`	`integer`	`1`	The number of `target`s clicking `classes.add` will add to the DOM
`classes.target`	`string`	`addel-target`	The class name of the element to be dynamically `addeled`™
`classes.add`	`string`	`addel-add`	The class name of the element that adds a `target` on click
`classes.delete`	`string`	`addel-delete`	The class name of the element that deletes a `target` on click
`classes.deleting`	`string`	`addel-delete`	The class name to be added to any `target` that is currently being deleted
`animation.duration`	`integer`	`0`	The animation's duration (in milliseconds) when `addeling`™
`animation.easing`	`string`	`swing`	The animation's easing when `addeling`™
`events.add`	`callback`	-	Detailed in the events section
`events.added`	`callback`	-	Detailed in the events section
`events.delete`	`callback`	-	Detailed in the events section
`events.deleted`	`callback`	-	Detailed in the events section

For more information on animation.duration and animation.easing, see jQuery's .fadeIn() and .fadeOut().
Note that it is possible to set the add option per element using a data-attribute, as described in the data-attributes section.

Options example

$('.people').addel({     hide: true,     add: 2,     classes: {         target: 'person',         add: 'btn-add',         delete: 'btn-del'     },     animation: {         duration: 300,         easing: 'linear'     } });

Data-attributes

Some options can be set declaratively as data-attributes on the HTML elements:

Option	Data-attribute equivalent	Placement
`hide`	`data-addel-hide`	container
`add`	`data-addel-add="<number>"`	container
`classes.target`	`data-addel-target`	target
`classes.add`	`data-addel-add` or `data-addel-add="<number>"`	add
`classes.delete`	`data-addel-delete`	delete
`animation.duration`	`data-addel-animation-duration`	container
`animation.easing`	`data-addel-animation-easing`	container

Setting data-addel-add is the same as setting data-addel-add="1".
Setting data-addel-add="5" on .addel-container will make all .addel-add / data-addel-add elements inside of it add 5 targets on click, by default.
Specifying in addition a data-addel-add="10" on a specific .addel-add / data-addel-add will make that specific element add 10 targets, overriding the default 5 set earlier on the container.
Note that for elements to behave as buttons that add targets, you need to add either data-addel-add or data-addel-add="<number>" to the element, there's no need for both.

Data-attributes example

<div class="addel" data-addel-hide="true" data-addel-add="2">     <div data-addel-target>         <button data-addel-delete></button>     </div>     <button data-addel-add="1"></button>  // adds 1 data-addel-target, as expected     <button data-addel-add></button>      // adds 2 data-addel-target due to default set on .addel     <button data-addel-add="3"></button>  // adds 3 data-addel-target on click, as expected </div> <script>     $(function() {         $('.addel').addel();     }); </script>

Defaults

Override the entire options object:

$.fn.addel.defaults = {     // options };

Or a specific option:

$.fn.addel.defaults.option = value;

Events

Event	Triggered when...	Exposes
`addel:add`	`add` is clicked	`event.target`
`addel:added`	`target` is added to the DOM	`event.target`, `event.added`
`addel:delete`	`delete` is clicked	`event.target`
`addel:deleted`	`target` is removed from the DOM	`event.target`

All events are triggered on the element addel is initialized upon (AKA container).

Events example

Ask for confirmation before deleting:

$('.addel-container').addel({          // other options      events: {         delete: function (event) {             if (!window.confirm('Are you absolutely positively sure?')) {                 event.preventDefault();             }         }     } });

Or bind the event yourself:

$('.addel-container').addel({     // other options }) .on('addel:delete', function (event) {     if (!window.confirm('Are you absolutely positively sure?')) {         event.preventDefault();     } });

Example

A more elaborate example of all of the above is included.

Dependencies

jQuery (v2-3).

Browser support

addel is developed using Chrome (v57). It should work properly on all evergreen browsers and IE9+.

Release policy

addel adheres to Semantic Versioning.

License

addel is released under the MIT license.