diff --git a/bookwyrm/static/js/shared.js b/bookwyrm/static/js/shared.js index 65f0dd65..391efcc2 100644 --- a/bookwyrm/static/js/shared.js +++ b/bookwyrm/static/js/shared.js @@ -209,249 +209,249 @@ function removeClass(el, className) { */ class TabGroup { constructor(container) { - this.container = container; - - this.tablist = this.container.querySelector('[role="tablist"]'); - this.buttons = this.tablist.querySelectorAll('[role="tab"]'); - this.panels = this.container.querySelectorAll(':scope > [role="tabpanel"]'); - this.delay = this.determineDelay(); - - if(!this.tablist || !this.buttons.length || !this.panels.length) { - return; - } - - this.keys = this.keys(); - this.direction = this.direction(); - this.initButtons(); - this.initPanels(); + this.container = container; + + this.tablist = this.container.querySelector('[role="tablist"]'); + this.buttons = this.tablist.querySelectorAll('[role="tab"]'); + this.panels = this.container.querySelectorAll(':scope > [role="tabpanel"]'); + this.delay = this.determineDelay(); + + if(!this.tablist || !this.buttons.length || !this.panels.length) { + return; + } + + this.keys = this.keys(); + this.direction = this.direction(); + this.initButtons(); + this.initPanels(); } - + keys() { - return { - end: 35, - home: 36, - left: 37, - up: 38, - right: 39, - down: 40 - }; + return { + end: 35, + home: 36, + left: 37, + up: 38, + right: 39, + down: 40 + }; } - + // Add or substract depending on key pressed direction() { - return { - 37: -1, - 38: -1, - 39: 1, - 40: 1 - }; + return { + 37: -1, + 38: -1, + 39: 1, + 40: 1 + }; } - - initButtons() { - let count = 0; - for(let button of this.buttons) { - let isSelected = button.getAttribute("aria-selected") === "true"; - button.setAttribute("tabindex", isSelected ? "0" : "-1"); - - button.addEventListener('click', this.clickEventListener.bind(this)); - button.addEventListener('keydown', this.keydownEventListener.bind(this)); - button.addEventListener('keyup', this.keyupEventListener.bind(this)); - - button.index = count++; - } - } - - initPanels() { - let selectedPanelId = this.tablist.querySelector('[role="tab"][aria-selected="true"]').getAttribute("aria-controls"); - for(let panel of this.panels) { - if(panel.getAttribute("id") !== selectedPanelId) { - panel.setAttribute("hidden", ""); - } - panel.setAttribute("tabindex", "0"); - } - } - - clickEventListener(event) { - let button = event.target.closest('a'); - event.preventDefault(); - - this.activateTab(button, false); + initButtons() { + let count = 0; + for(let button of this.buttons) { + let isSelected = button.getAttribute("aria-selected") === "true"; + button.setAttribute("tabindex", isSelected ? "0" : "-1"); + + button.addEventListener('click', this.clickEventListener.bind(this)); + button.addEventListener('keydown', this.keydownEventListener.bind(this)); + button.addEventListener('keyup', this.keyupEventListener.bind(this)); + + button.index = count++; + } } - + + initPanels() { + let selectedPanelId = this.tablist.querySelector('[role="tab"][aria-selected="true"]').getAttribute("aria-controls"); + for(let panel of this.panels) { + if(panel.getAttribute("id") !== selectedPanelId) { + panel.setAttribute("hidden", ""); + } + panel.setAttribute("tabindex", "0"); + } + } + + clickEventListener(event) { + let button = event.target.closest('a'); + + event.preventDefault(); + + this.activateTab(button, false); + } + // Handle keydown on tabs keydownEventListener(event) { - var key = event.keyCode; - - switch (key) { - case this.keys.end: - event.preventDefault(); - // Activate last tab - this.activateTab(this.buttons[this.buttons.length - 1]); - break; - case this.keys.home: - event.preventDefault(); - // Activate first tab - this.activateTab(this.buttons[0]); - break; - - // Up and down are in keydown - // because we need to prevent page scroll >:) - case this.keys.up: - case this.keys.down: - this.determineOrientation(event); - break; - }; + var key = event.keyCode; + + switch (key) { + case this.keys.end: + event.preventDefault(); + // Activate last tab + this.activateTab(this.buttons[this.buttons.length - 1]); + break; + case this.keys.home: + event.preventDefault(); + // Activate first tab + this.activateTab(this.buttons[0]); + break; + + // Up and down are in keydown + // because we need to prevent page scroll >:) + case this.keys.up: + case this.keys.down: + this.determineOrientation(event); + break; + } } - + // Handle keyup on tabs keyupEventListener(event) { - var key = event.keyCode; - - switch (key) { - case this.keys.left: - case this.keys.right: - this.determineOrientation(event); - break; - }; + var key = event.keyCode; + + switch (key) { + case this.keys.left: + case this.keys.right: + this.determineOrientation(event); + break; + } } - + // When a tablist’s aria-orientation is set to vertical, // only up and down arrow should function. // In all other cases only left and right arrow function. determineOrientation(event) { - var key = event.keyCode; - var vertical = this.tablist.getAttribute('aria-orientation') == 'vertical'; - var proceed = false; - - if (vertical) { - if (key === this.keys.up || key === this.keys.down) { - event.preventDefault(); - proceed = true; - }; - } - else { - if (key === this.keys.left || key === this.keys.right) { - proceed = true; - }; - }; - - if (proceed) { - this.switchTabOnArrowPress(event); - }; + var key = event.keyCode; + var vertical = this.tablist.getAttribute('aria-orientation') == 'vertical'; + var proceed = false; + + if (vertical) { + if (key === this.keys.up || key === this.keys.down) { + event.preventDefault(); + proceed = true; + } + } + else { + if (key === this.keys.left || key === this.keys.right) { + proceed = true; + } + } + + if (proceed) { + this.switchTabOnArrowPress(event); + } } - + // Either focus the next, previous, first, or last tab // depending on key pressed switchTabOnArrowPress(event) { - var pressed = event.keyCode; - - for (let button of this.buttons) { - button.addEventListener('focus', this.focusEventHandler.bind(this)); - }; - - if (this.direction[pressed]) { - var target = event.target; - if (target.index !== undefined) { - if (this.buttons[target.index + this.direction[pressed]]) { - this.buttons[target.index + this.direction[pressed]].focus(); - } - else if (pressed === this.keys.left || pressed === this.keys.up) { - this.focusLastTab(); - } - else if (pressed === this.keys.right || pressed == this.keys.down) { - this.focusFirstTab(); - } + var pressed = event.keyCode; + + for (let button of this.buttons) { + button.addEventListener('focus', this.focusEventHandler.bind(this)); + } + + if (this.direction[pressed]) { + var target = event.target; + if (target.index !== undefined) { + if (this.buttons[target.index + this.direction[pressed]]) { + this.buttons[target.index + this.direction[pressed]].focus(); + } + else if (pressed === this.keys.left || pressed === this.keys.up) { + this.focusLastTab(); + } + else if (pressed === this.keys.right || pressed == this.keys.down) { + this.focusFirstTab(); + } + } } - } } - + // Activates any given tab panel activateTab (tab, setFocus) { - if(tab.getAttribute("role") !== "tab") { - tab = tab.closest('[role="tab"]'); - } - - setFocus = setFocus || true; - - // Deactivate all other tabs - this.deactivateTabs(); - - // Remove tabindex attribute - tab.removeAttribute('tabindex'); - - // Set the tab as selected - tab.setAttribute('aria-selected', 'true'); - - // Give the tab parent an is-active class - tab.parentNode.classList.add('is-active'); - - // Get the value of aria-controls (which is an ID) - var controls = tab.getAttribute('aria-controls'); - - // Remove hidden attribute from tab panel to make it visible - document.getElementById(controls).removeAttribute('hidden'); - - // Set focus when required - if (setFocus) { - tab.focus(); - } + if(tab.getAttribute("role") !== "tab") { + tab = tab.closest('[role="tab"]'); + } + + setFocus = setFocus || true; + + // Deactivate all other tabs + this.deactivateTabs(); + + // Remove tabindex attribute + tab.removeAttribute('tabindex'); + + // Set the tab as selected + tab.setAttribute('aria-selected', 'true'); + + // Give the tab parent an is-active class + tab.parentNode.classList.add('is-active'); + + // Get the value of aria-controls (which is an ID) + var controls = tab.getAttribute('aria-controls'); + + // Remove hidden attribute from tab panel to make it visible + document.getElementById(controls).removeAttribute('hidden'); + + // Set focus when required + if (setFocus) { + tab.focus(); + } } - + // Deactivate all tabs and tab panels deactivateTabs() { - for (let button of this.buttons) { - button.parentNode.classList.remove('is-active'); - button.setAttribute('tabindex', '-1'); - button.setAttribute('aria-selected', 'false'); - button.removeEventListener('focus', this.focusEventHandler.bind(this)); - } - - for (let panel of this.panels) { - panel.setAttribute('hidden', 'hidden'); - } + for (let button of this.buttons) { + button.parentNode.classList.remove('is-active'); + button.setAttribute('tabindex', '-1'); + button.setAttribute('aria-selected', 'false'); + button.removeEventListener('focus', this.focusEventHandler.bind(this)); + } + + for (let panel of this.panels) { + panel.setAttribute('hidden', 'hidden'); + } } - + focusFirstTab() { - this.buttons[0].focus(); + this.buttons[0].focus(); } - + focusLastTab() { - this.buttons[this.buttons.length - 1].focus(); + this.buttons[this.buttons.length - 1].focus(); } - + // Determine whether there should be a delay // when user navigates with the arrow keys determineDelay() { - var hasDelay = this.tablist.hasAttribute('data-delay'); - var delay = 0; - - if (hasDelay) { - var delayValue = this.tablist.getAttribute('data-delay'); - if (delayValue) { - delay = delayValue; + var hasDelay = this.tablist.hasAttribute('data-delay'); + var delay = 0; + + if (hasDelay) { + var delayValue = this.tablist.getAttribute('data-delay'); + if (delayValue) { + delay = delayValue; + } + else { + // If no value is specified, default to 300ms + delay = 300; + } } - else { - // If no value is specified, default to 300ms - delay = 300; - }; - }; - - return delay; + + return delay; } - + focusEventHandler(event) { - var target = event.target; - - setTimeout(this.checkTabFocus.bind(this), this.delay, target); - }; - + var target = event.target; + + setTimeout(this.checkTabFocus.bind(this), this.delay, target); + } + // Only activate tab on focus if it still has focus after the delay checkTabFocus(target) { - let focused = document.activeElement; - - if (target === focused) { - this.activateTab(target, false); - } + let focused = document.activeElement; + + if (target === focused) { + this.activateTab(target, false); + } } - } +}