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Radiogroup Examples: Improve High Contrast Support and Conformance wi…
…th APG Coding Practices (pull #1485) Co-authored-by: Matt King <[email protected]> Co-authored-by: Valerie Young <[email protected]>
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| /* | ||
| * This content is licensed according to the W3C Software License at | ||
| * https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document | ||
| * | ||
| * File: radio-activedescendant.js | ||
| * | ||
| * Desc: Radio group widget using aria-activedescendant that implements ARIA Authoring Practices | ||
| */ | ||
|
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| 'use strict'; | ||
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| var RadioGroupActiveDescendant = function (groupNode) { | ||
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| this.groupNode = groupNode; | ||
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| this.radioButtons = []; | ||
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| this.firstRadioButton = null; | ||
| this.lastRadioButton = null; | ||
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| this.groupNode.addEventListener('keydown', this.handleKeydown.bind(this)); | ||
| this.groupNode.addEventListener('focus', this.handleFocus.bind(this)); | ||
| this.groupNode.addEventListener('blur', this.handleBlur.bind(this)); | ||
|
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| // initialize | ||
| if (!this.groupNode.getAttribute('role')) { | ||
| this.groupNode.setAttribute('role', 'radiogroup'); | ||
| } | ||
|
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| var rbs = this.groupNode.querySelectorAll('[role=radio]'); | ||
|
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| for (var i = 0; i < rbs.length; i++) { | ||
| var rb = rbs[i]; | ||
| rb.addEventListener('click', this.handleClick.bind(this)); | ||
| this.radioButtons.push(rb); | ||
| if (!this.firstRadioButton) { | ||
| this.firstRadioButton = rb; | ||
| } | ||
| this.lastRadioButton = rb; | ||
| } | ||
| this.groupNode.tabIndex = 0; | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.setChecked = function (currentItem) { | ||
| for (var i = 0; i < this.radioButtons.length; i++) { | ||
| var rb = this.radioButtons[i]; | ||
| rb.setAttribute('aria-checked', 'false'); | ||
| rb.classList.remove('focus'); | ||
| } | ||
| currentItem.setAttribute('aria-checked', 'true'); | ||
| currentItem.classList.add('focus'); | ||
| this.groupNode.setAttribute('aria-activedescendant', currentItem.id); | ||
| this.groupNode.focus(); | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.setCheckedToPreviousItem = function (currentItem) { | ||
| var index; | ||
|
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| if (currentItem === this.firstRadioButton) { | ||
| this.setChecked(this.lastRadioButton); | ||
| } | ||
| else { | ||
| index = this.radioButtons.indexOf(currentItem); | ||
| this.setChecked(this.radioButtons[index - 1]); | ||
| } | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.setCheckedToNextItem = function (currentItem) { | ||
| var index; | ||
|
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| if (currentItem === this.lastRadioButton) { | ||
| this.setChecked(this.firstRadioButton); | ||
| } | ||
| else { | ||
| index = this.radioButtons.indexOf(currentItem); | ||
| this.setChecked(this.radioButtons[index + 1]); | ||
| } | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.getCurrentRadioButton = function () { | ||
| var id = this.groupNode.getAttribute('aria-activedescendant'); | ||
| if (!id) { | ||
| this.groupNode.setAttribute('aria-activedescendant', this.firstRadioButton.id); | ||
| return this.firstRadioButton; | ||
| } | ||
| for (var i = 0; i < this.radioButtons.length; i++) { | ||
| var rb = this.radioButtons[i]; | ||
| if (rb.id === id) { | ||
| return rb; | ||
| } | ||
| } | ||
| this.groupNode.setAttribute('aria-activedescendant', this.firstRadioButton.id); | ||
| return this.firstRadioButton; | ||
| }; | ||
|
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| // Event Handlers | ||
|
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| RadioGroupActiveDescendant.prototype.handleKeydown = function (event) { | ||
| var flag = false; | ||
|
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| var currentItem = this.getCurrentRadioButton(); | ||
| switch (event.key) { | ||
| case ' ': | ||
| case 'Enter': | ||
| this.setChecked(currentItem); | ||
| flag = true; | ||
| break; | ||
|
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| case 'Up': | ||
| case 'ArrowUp': | ||
| case 'Left': | ||
| case 'ArrowLeft': | ||
| this.setCheckedToPreviousItem(currentItem); | ||
| flag = true; | ||
| break; | ||
|
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| case 'Down': | ||
| case 'ArrowDown': | ||
| case 'Right': | ||
| case 'ArrowRight': | ||
| this.setCheckedToNextItem(currentItem); | ||
| flag = true; | ||
| break; | ||
|
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| default: | ||
| break; | ||
| } | ||
|
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| if (flag) { | ||
| event.stopPropagation(); | ||
| event.preventDefault(); | ||
| } | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.handleClick = function (event) { | ||
| this.setChecked(event.currentTarget); | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.handleFocus = function () { | ||
| var currentItem = this.getCurrentRadioButton(); | ||
| currentItem.classList.add('focus'); | ||
| }; | ||
|
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| RadioGroupActiveDescendant.prototype.handleBlur = function () { | ||
| var currentItem = this.getCurrentRadioButton(); | ||
| currentItem.classList.remove('focus'); | ||
| }; | ||
|
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| // Initialize radio button group using aria-activedescendant | ||
|
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| window.addEventListener('load', function () { | ||
| var rgs = document.querySelectorAll('.radiogroup-activedescendant'); | ||
| for(var i=0; i < rgs.length; i++) { | ||
| new RadioGroupActiveDescendant(rgs[i]); | ||
| } | ||
| }); |
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