@superkoders/modal

Modal window/popup which main purpose is to open as image galery. But it can handle also other type of content like Youtube, Vimeo or HTML5 videos, iframes, custom HTML content or HTML content from some existing element on the page. It can recognize type of media from the source url. If it is not possible to recognize media type, default type is iframe. You can force media type by medium parameter (see examples below).

Installing

Using npm
``
$ npm install @superkoders/modal
`
Using yarn
`
$ yarn add @superkoders/modal
`

How to use

There are two methods exported: initModal and createModal. First one adds click listeners to each element in given context which matches modalSelector option (by default '[data-modal]'). It returns array of modal instances created. Second one is for creating custom modal instance.

$3

`
import { initModal } from '@superkoders/modal';

// use default options
initModal();

// or set some custom options
initModal({
customWrapperClass: 'my-custom-modal',
closeOnBgClick: true,
});
`

#### How to create modal triggers in your HTML code
The easiest way is to do it with an a tag using its href attribute as an url for modal.
`
Open Youtube video in the modal
`
If you want to use some other element like button, you need to specify url in the data-modal attribute.
`
Open Youtube video in the modal
`

$3


In this case, there are no triggers which open modal. Once you create an instance, you need to open it by yourself. Also you need to pass modal items, where only mandatory property is url. In our example below the modal will have two items, first is some image, second is some video.
`
import { createModal } from '@superkoders/modal';

const items = [
{
url: 'url/to/some/image.jpg'
},
{
url: 'url/to/some/video.mp4'
}
]

// create instance
const customModal = createModal(items, {
customWrapperClass: 'my-custom-modal',
closeOnBgClick: true,
});

// open modal
customModal.methods.open();

// go to next slide
customModal.methods.next();

// close modal
customModal.methods.close();
`

Documentation

$3

These options you can adjust during initialization.

#### context: Element | Document

Context element, in which to search for modal items (triggers)\
Default value: document

#### parentElement: Element

Element, which is used as a parent for modal element in DOM\
Default value: document.body

#### modalSelector: string

Element selector, which is used for modal triggers\
Default value: '[data-modal]'

#### closeSelector: string

Element selector, which is used to close the modal\
Default value: '.js-modal-close'

#### customWrapperClass: string

Custom CSS class, which is added to the modal element\
Default value: undefined

#### infinite: boolean

It determines if modal items are shown in a loop\
Default value: false

#### closeOnBgClick: boolean

It determines if modal will close after background click\
Default value: undefined

#### plugins: SKModalPlugin[]

Plugins array to initialize\
Default value: undefined

#### hideNav: boolean

It determines if the navigation (arrows, bullets) is hidden or not\
Default value: undefined

#### customData: any

Any data which you can use for example in plugins\
Default value: undefined

#### closeIcon: string

String which represents an icon for close button, it can be also HTML code\
Default value: '×'

#### prevIcon: string

String which represents an icon for previous button, it can be also HTML code\
Default value: '←'

#### nextIcon: string

String which represents an icon for next button, it can be also HTML code\
Default value: '→'

#### loadIcon: string

String which represents an icon for loader, it can be also HTML code\
Default value: '↺'

#### removeOnClose: boolean

It determines if modal element will be removed from DOM after close\
Default value: false

#### enableFocusTrap: boolean
Enables or disables focus trap.
Default value: true

#### focusTrapOptions: FocusTrapOptions

Focus trap custom options. See Focus trap package page for more info
Default value:
`
{
allowOutsideClick: true,
}
`

#### useSwipe: boolean
Enables or disables swipe slide change on touch devices.
Default value: true

#### ariaLabel: string
Modal title for assistive technologies.
Default value: undefined

#### buildStructure: (modal: Element, fragments: SKModalFragments) => void

Method which builds the modal HTML structure, not really necessary to change if you use grid for CSS\
Default value:
`
(modal, {
ariaLabel,
header,
titleElem,
descElem,
content,
prevElem,
nextElem,
navElem,
loader,
bg,
}) => {
const wrapper = document.createElement('div');
wrapper.classList.add('b-modal__wrapper');

if (ariaLabel) {
modal.setAttribute('aria-labelledby', ariaLabel.id);
modal.appendChild(ariaLabel);
}

wrapper.appendChild(header);
wrapper.appendChild(titleElem);
wrapper.appendChild(descElem);
wrapper.appendChild(content);
wrapper.appendChild(prevElem);
wrapper.appendChild(nextElem);
wrapper.appendChild(navElem);
modal.appendChild(wrapper);
modal.appendChild(loader);
modal.appendChild(bg);
}
`

#### headerTpl: (options?: SKModalOptions) => string

Method for header template\
Default value:
`
(options) =>

Close
${options.closeIcon}


`

#### titleTpl: (text: string) => string

Method for title template\
Default value:
`
(text: string) =>

${text}


`

#### descTpl: (text: string) => string

Method for description template\
Default value:
`
(text: string) =>

${text}


`

#### prevTpl: (options?: SKModalOptions) => string

Method for previous button template\
Default value:
`
(options) => ${options.prevIcon}
`

#### nextTpl: (options?: SKModalOptions) => string

Method for next button template\
Default value:
`
(options) => ${options.nextIcon}
`

#### navTpl: (items: SKModalItem[]) => string

Method for navigation (bullets) template\
Default value:
`
(items) =>
items
.map((_item, index) => )
.join('')
`

#### loaderTpl: (options?: SKModalOptions) => string

Method for loader template\
Default value:
`
(options) => ${options.loadIcon}
`

#### imageLoader: (src: string) => Promise

Method which is used for loading images\
Default value:
`
(src) => {
return new Promise((resolve, reject) => {
let img = new Image();
img.addEventListener('load', () => resolve(img));
img.addEventListener('error', () => {
reject(new Error(Failed to load image with src: ${src}));
});
img.draggable = false;
img.src = src;
});
}
`

#### fetchLoader: (url: string, element?: Element) => Promise

Method which is used for fetching content from a server\
Default value:
`
async (url) => await fetch(url).then((response) => response.text())
`

#### onModalOpen: (event?: Event, data?: { id: number }) => void

Handler, which runs after modal is opened\
Default value: undefined

#### onModalClose: (event?: Event, data?: { id: number }) => void

Handler, which runs after modal is closed\
Default value: undefined

#### onModalContentLoaded: (event?: Event, data?: { modal: SKModal }) => void

Handler, which runs after modal content is loaded\
Default value: undefined

#### onModalSlideChanged: (event?: Event, data?: { page: number }) => void

Handler, which runs after modal slide has changed\
Default value: undefined

$3

All these parameters is possible to add to data-modal attribute. In case of createModal, these are properties of the modal item object.

#### url: string | string[]

Media url. In case of images, it can be an array. Then more images are shown on one slide.

#### medium: ModalMedium

Media type. Posible values in ModalMedium enum exported from @superkoders/modal

#### title: string

Text, which will appear in modal title

#### desc: string

Text, which will appear in modal description

#### gallery: string

Gallery key, which is used for grouping items into one modal. If it is undefined, each modal uses its own popup.

#### modalClass: string

CSS class which will be aplied for modal wrapper element, when modal is opened.

#### [key: string]: any

It is possible to add more custom parameters, which can be used in plugins for example.

$3

Plugins enable another modal customization. It has these three parameters:

#### init: (modal: SKModal) => void

Init method

#### destroy: (modal: SKModal) => void

Destroy method, it runs after modal redraw (if reInitOnRedraw is set to true) or after modal destroy

#### reInitOnRedraw: boolean

It determines, if plugin should be reinitialized after modal redraw.

#### Plugin example
my-plugin.js
`
export const myPlugin = {
init: (modal) => {
// do some stuff like add event listeners or add some elements to DOM
},
destroy: (modal) => {
// use when you need to remove some listeners or remove some elements from DOM
},
reInitOnRedraw: true,
}
`
modal.js
`
import { initModal } from '@superkoders/modal';
import { myPlugin } from './my-plugin.js';

initModal({
plugins: [myPlugin]
});
`

Version 2.0 major changes

1. The wrapper element is now a dialog element. It has better accessibility. You can check browser support here. If you need to support browser wich don't support dialog element, you can use older version (1.7.0).
2. scroll-lock npm package has been removed. We prefer to use CSS pure solution. It can be done by adding scrollbar-gutter: stable on html element and overflow: clip on body element. For this purpose, class is-modal-open is added to body when dialog is opened. If you prefer to use scroll-lock, you can use older version (1.7.0)
3. The dialog element comes with its own focus trap functionality. This however did not meet our requirements, so we are still using focus-trap npm package for this. If you prefer to use native dialog focus trap functionality, you can disable focus trap with enableFocusTrap option (set it to false).

Troubleshooting

@superkoders/modal uses some functionality from @superkoders/sk-tools. If you are already using @superkoders/sk-tools on your project, check if the version is at least 1.4.0`. If not, you need to update the package.