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Editing: lity.js

/*! Lity - v3.0.0-dev - 2020-04-26
* http://sorgalla.com/lity/
* Copyright (c) 2015-2020 Jan Sorgalla; Licensed MIT */
(function(window, factory) {
    if (typeof define === 'function' && define.amd) {
        define(['jquery'], function($) {
            return factory(window, $);
        });
    } else if (typeof module === 'object' && typeof module.exports === 'object') {
        module.exports = factory(window, require('jquery'));
    } else {
        window.lity = factory(window, window.jQuery || window.Zepto);
    }
}(typeof window !== "undefined" ? window : this, function(window, $) {
    'use strict';

var document = window.document;

var _win = $(window);
    var _deferred = $.Deferred;
    var _html = $('html');
    var _instances = [];

var _attrAriaHidden = 'aria-hidden';
    var _dataAriaHidden = 'lity-' + _attrAriaHidden;

var _focusableElementsSelector = 'a[href],area[href],input:not([disabled]),select:not([disabled]),textarea:not([disabled]),button:not([disabled]),iframe,object,embed,[contenteditable],[tabindex]:not([tabindex^="-"])';

var _defaultOptions = {
        esc: true,
        handler: null,
        handlers: {
            image: imageHandler,
            inline: inlineHandler,
            iframe: iframeHandler
        },
        forceFocusInside: false,
        template: '<div class="lity" role="dialog" aria-label="Dialog Window (Press escape to close)" tabindex="-1"><div class="lity-wrap" data-lity-close role="document"><div class="lity-loader" aria-hidden="true">Loading...</div><div class="lity-container"><div class="lity-content"></div><button class="lity-close" type="button" aria-label="Close (Press escape to close)" data-lity-close>&times;</button></div></div></div>'
    };

var _imageRegexp = /(^data:image\/)|(\.(png|jpe?g|gif|svg|webp|bmp|ico|tiff?)(\?\S*)?$)/i;

var _transitionEndEvent = (function() {
        var el = document.createElement('div');

var transEndEventNames = {
            WebkitTransition: 'webkitTransitionEnd',
            MozTransition: 'transitionend',
            OTransition: 'oTransitionEnd otransitionend',
            transition: 'transitionend'
        };

for (var name in transEndEventNames) {
            if (el.style[name] !== undefined) {
                return transEndEventNames[name];
            }
        }

return false;
    })();

function transitionEnd(element) {
        var deferred = _deferred();

if (!_transitionEndEvent || !element.length) {
            deferred.resolve();
        } else {
            element.one(_transitionEndEvent, deferred.resolve);
            setTimeout(deferred.resolve, 500);
        }

return deferred.promise();
    }

function settings(currSettings, key, value) {
        if (arguments.length === 1) {
            return $.extend({}, currSettings);
        }

if (typeof key === 'string') {
            if (typeof value === 'undefined') {
                return typeof currSettings[key] === 'undefined'
                    ? null
                    : currSettings[key];
            }

currSettings[key] = value;
        } else {
            $.extend(currSettings, key);
        }

return this;
    }

function parseQueryParams(params) {
        var pos = params.indexOf('?');

if (pos > -1) {
            params = params.substr(pos + 1);
        }

var pairs = decodeURI(params.split('#')[0]).split('&');
        var obj = {}, p;

for (var i = 0, n = pairs.length; i < n; i++) {
            if (!pairs[i]) {
                continue;
            }

p = pairs[i].split('=');
            obj[p[0]] = p[1];
        }

return obj;
    }

function appendQueryParams(url, params) {
        if (!params) {
            return url;
        }

if ('string' === $.type(params)) {
            params = parseQueryParams(params);
        }

if (url.indexOf('?') > -1) {
            var split = url.split('?');
            url = split.shift();

params = $.extend(
                {},
                parseQueryParams(split[0]),
                params
            )
        }

return url + '?' + $.param(params);
    }

function transferHash(originalUrl, newUrl) {
        var pos = originalUrl.indexOf('#');

if (-1 === pos) {
            return newUrl;
        }

if (pos > 0) {
            originalUrl = originalUrl.substr(pos);
        }

return newUrl + originalUrl;
    }

function iframe(iframeUrl, instance, queryParams, hashUrl) {
        instance && instance.element().addClass('lity-iframe');

if (queryParams) {
            iframeUrl = appendQueryParams(iframeUrl, queryParams);
        }

if (hashUrl) {
            iframeUrl = transferHash(hashUrl, iframeUrl);
        }

return '<div class="lity-iframe-container"><iframe frameborder="0" allowfullscreen allow="autoplay; fullscreen" src="' + iframeUrl + '"/></div>';
    }

function error(msg) {
        return $('<span class="lity-error"></span>').append(msg);
    }

function imageHandler(target, instance) {
        var desc = (instance.opener() && instance.opener().data('lity-desc')) || 'Image with no description';
        var img = $('<img src="' + target + '" alt="' + desc + '"/>');
        var deferred = _deferred();
        var failed = function() {
            deferred.reject(error('Failed loading image'));
        };

img
            .on('load', function() {
                if (this.naturalWidth === 0) {
                    return failed();
                }

deferred.resolve(img);
            })
            .on('error', failed)
        ;

return deferred.promise();
    }

imageHandler.test = function(target) {
        return _imageRegexp.test(target);
    };

function inlineHandler(target, instance) {
        var el, placeholder, hasHideClass;

try {
            el = $(target);
        } catch (e) {
            return false;
        }

if (!el.length) {
            return false;
        }

placeholder = $('<i style="display:none !important"></i>');
        hasHideClass = el.hasClass('lity-hide');

instance
            .element()
            .one('lity:remove', function() {
                placeholder
                    .before(el)
                    .remove()
                ;

if (hasHideClass && !el.closest('.lity-content').length) {
                    el.addClass('lity-hide');
                }
            })
        ;

return el
            .removeClass('lity-hide')
            .after(placeholder)
        ;
    }

function iframeHandler(target, instance) {
        return iframe(target, instance);
    }

function winHeight() {
        return document.documentElement.clientHeight
            ? document.documentElement.clientHeight
            : Math.round(_win.height());
    }

function keydown(e) {
        var current = currentInstance();

if (!current) {
            return;
        }

// ESC key
        if (e.keyCode === 27 && !!current.options('esc')) {
            current.close();
        }

// TAB key
        if (e.keyCode === 9) {
            handleTabKey(e, current);
        }
    }

function handleTabKey(e, instance) {
        var focusableElements = instance.element().find(_focusableElementsSelector);
        var focusedIndex = focusableElements.index(document.activeElement);

if (e.shiftKey && focusedIndex <= 0) {
            focusableElements.get(focusableElements.length - 1).focus();
            e.preventDefault();
        } else if (!e.shiftKey && focusedIndex === focusableElements.length - 1) {
            focusableElements.get(0).focus();
            e.preventDefault();
        }
        if (focusedIndex === -1 && instance.options().forceFocusInside) {
            focusableElements.get(0).focus();
            e.preventDefault();
        }
    }

function resize() {
        $.each(_instances, function(i, instance) {
            instance.resize();
        });
    }

function registerInstance(instanceToRegister) {
        if (1 === _instances.unshift(instanceToRegister)) {
            _html.addClass('lity-active');

_win
                .on({
                    resize: resize,
                    keydown: keydown
                })
            ;
        }

$('body > *').not(instanceToRegister.element())
            .addClass('lity-hidden')
            .each(function() {
                var el = $(this);

if (undefined !== el.data(_dataAriaHidden)) {
                    return;
                }

el.data(_dataAriaHidden, el.attr(_attrAriaHidden) || null);
            })
            .attr(_attrAriaHidden, 'true')
        ;
    }

function removeInstance(instanceToRemove) {
        var show;

instanceToRemove
            .element()
            .attr(_attrAriaHidden, 'true')
        ;

if (1 === _instances.length) {
            _html.removeClass('lity-active');

_win
                .off({
                    resize: resize,
                    keydown: keydown
                })
            ;
        }

_instances = $.grep(_instances, function(instance) {
            return instanceToRemove !== instance;
        });

if (!!_instances.length) {
            show = _instances[0].element();
        } else {
            show = $('.lity-hidden');
        }

show
            .removeClass('lity-hidden')
            .each(function() {
                var el = $(this), oldAttr = el.data(_dataAriaHidden);

if (!oldAttr) {
                    el.removeAttr(_attrAriaHidden);
                } else {
                    el.attr(_attrAriaHidden, oldAttr);
                }

el.removeData(_dataAriaHidden);
            })
        ;
    }

function currentInstance() {
        if (0 === _instances.length) {
            return null;
        }

return _instances[0];
    }

function factory(target, instance, handlers, preferredHandler) {
        var handler = 'inline', content;

var currentHandlers = $.extend({}, handlers);

if (preferredHandler && currentHandlers[preferredHandler]) {
            content = currentHandlers[preferredHandler](target, instance);
            handler = preferredHandler;
        } else {
            // Run inline and iframe handlers after all other handlers
            $.each(['inline', 'iframe'], function(i, name) {
                delete currentHandlers[name];

currentHandlers[name] = handlers[name];
            });

$.each(currentHandlers, function(name, currentHandler) {
                // Handler might be "removed" by setting callback to null
                if (!currentHandler) {
                    return true;
                }

if (
                    currentHandler.test &&
                    !currentHandler.test(target, instance)
                ) {
                    return true;
                }

content = currentHandler(target, instance);

if (false !== content) {
                    handler = name;
                    return false;
                }
            });
        }

return {handler: handler, content: content || ''};
    }

function Lity(target, options, opener, activeElement) {
        var self = this;
        var result;
        var isReady = false;
        var isClosed = false;
        var element;
        var content;

options = $.extend(
            {},
            _defaultOptions,
            options
        );

element = $(options.template);

// -- API --

self.element = function() {
            return element;
        };

self.opener = function() {
            return opener;
        };

self.content = function() {
            return content;
        };

self.options  = $.proxy(settings, self, options);
        self.handlers = $.proxy(settings, self, options.handlers);

self.resize = function() {
            if (!isReady || isClosed) {
                return;
            }

content
                .css('max-height', winHeight() + 'px')
                .trigger('lity:resize', [self])
            ;
        };

self.close = function() {
            if (isClosed) {
                return;
            }

isClosed = true;

removeInstance(self);

var deferred = _deferred();

// We return focus only if the current focus is inside this instance
            if (
                activeElement &&
                (
                    document.activeElement === element[0] ||
                    $.contains(element[0], document.activeElement)
                )
            ) {
                try {
                    activeElement.focus();
                } catch (e) {
                    // Ignore exceptions, eg. for SVG elements which can't be
                    // focused in IE11
                }
            }

var trigerable = (content ? content : element);
            trigerable.trigger('lity:close', [self]);

element
                .removeClass('lity-opened')
                .addClass('lity-closed')
            ;

transitionEnd(trigerable.add(element))
                .always(function() {
                    trigerable.trigger('lity:remove', [self]);
                    element.remove();
                    element = undefined;
                    deferred.resolve();
                })
            ;

return deferred.promise();
        };

// -- Initialization --

result = factory(target, self, options.handlers, options.handler);

element
            .attr(_attrAriaHidden, 'false')
            .addClass('lity-loading lity-opened lity-' + result.handler)
            .appendTo('body')
            .focus()
            .on('click', '[data-lity-close]', function(e) {
                if ($(e.target).is('[data-lity-close]')) {
                    self.close();
                }
            })
            .trigger('lity:open', [self])
        ;

registerInstance(self);

$.when(result.content)
            .always(ready)
        ;

function ready(result) {
            if (isClosed) {
                return;
            }
            content = $(result)
                .css('max-height', winHeight() + 'px')
            ;

element
                .find('.lity-loader')
                .each(function() {
                    var loader = $(this);

transitionEnd(loader)
                        .always(function() {
                            loader.remove();
                        })
                    ;
                })
            ;

element
                .removeClass('lity-loading')
                .find('.lity-content')
                .empty()
                .append(content)
            ;

isReady = true;

content
                .trigger('lity:ready', [self])
            ;
        }
    }

function lity(target, options, opener) {
        if (!target.preventDefault) {
            opener = $(opener);
        } else {
            target.preventDefault();
            opener = $(this);
            target = opener.data('lity-target') || opener.attr('href') || opener.attr('src');
        }

var instance = new Lity(
            target,
            $.extend(
                {},
                opener.data('lity-options') || opener.data('lity'),
                options
            ),
            opener,
            document.activeElement
        );

if (!target.preventDefault) {
            return instance;
        }
    }

lity.version  = '3.0.0-dev';
    lity.options  = $.proxy(settings, lity, _defaultOptions);
    lity.handlers = $.proxy(settings, lity, _defaultOptions.handlers);
    lity.current  = currentInstance;
    lity.iframe   = iframe;

$(document).on('click.lity', '[data-lity]', lity);

return lity;
}));