65 lines
2.5 KiB
JavaScript
65 lines
2.5 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.getLabelContent = getLabelContent;
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exports.getLabels = getLabels;
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exports.getRealLabels = getRealLabels;
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var _helpers = require("./helpers");
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const labelledNodeNames = ['button', 'meter', 'output', 'progress', 'select', 'textarea', 'input'];
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function getTextContent(node) {
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if (labelledNodeNames.includes(node.nodeName.toLowerCase())) {
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return '';
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}
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if (node.nodeType === _helpers.TEXT_NODE) return node.textContent;
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return Array.from(node.childNodes).map(childNode => getTextContent(childNode)).join('');
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}
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function getLabelContent(element) {
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let textContent;
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if (element.tagName.toLowerCase() === 'label') {
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textContent = getTextContent(element);
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} else {
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textContent = element.value || element.textContent;
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}
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return textContent;
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}
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// Based on https://github.com/eps1lon/dom-accessibility-api/pull/352
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function getRealLabels(element) {
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// eslint-disable-next-line @typescript-eslint/no-unnecessary-condition -- types are not aware of older browsers that don't implement `labels`
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if (element.labels !== undefined) {
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var _labels;
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return (_labels = element.labels) != null ? _labels : [];
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}
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if (!isLabelable(element)) return [];
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const labels = element.ownerDocument.querySelectorAll('label');
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return Array.from(labels).filter(label => label.control === element);
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}
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function isLabelable(element) {
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return /BUTTON|METER|OUTPUT|PROGRESS|SELECT|TEXTAREA/.test(element.tagName) || element.tagName === 'INPUT' && element.getAttribute('type') !== 'hidden';
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}
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function getLabels(container, element, {
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selector = '*'
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} = {}) {
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const ariaLabelledBy = element.getAttribute('aria-labelledby');
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const labelsId = ariaLabelledBy ? ariaLabelledBy.split(' ') : [];
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return labelsId.length ? labelsId.map(labelId => {
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const labellingElement = container.querySelector(`[id="${labelId}"]`);
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return labellingElement ? {
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content: getLabelContent(labellingElement),
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formControl: null
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} : {
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content: '',
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formControl: null
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};
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}) : Array.from(getRealLabels(element)).map(label => {
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const textToMatch = getLabelContent(label);
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const formControlSelector = 'button, input, meter, output, progress, select, textarea';
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const labelledFormControl = Array.from(label.querySelectorAll(formControlSelector)).filter(formControlElement => formControlElement.matches(selector))[0];
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return {
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content: textToMatch,
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formControl: labelledFormControl
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};
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});
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}
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