| /** |
| * @license |
| * Copyright Google LLC All Rights Reserved. |
| * |
| * Use of this source code is governed by an MIT-style license that can be |
| * found in the LICENSE file at https://angular.io/license |
| */ |
| /** IDs are delimited by an empty space, as per the spec. */ |
| const ID_DELIMITER = ' '; |
| /** |
| * Adds the given ID to the specified ARIA attribute on an element. |
| * Used for attributes such as aria-labelledby, aria-owns, etc. |
| */ |
| export function addAriaReferencedId(el, attr, id) { |
| const ids = getAriaReferenceIds(el, attr); |
| if (ids.some(existingId => existingId.trim() == id.trim())) { |
| return; |
| } |
| ids.push(id.trim()); |
| el.setAttribute(attr, ids.join(ID_DELIMITER)); |
| } |
| /** |
| * Removes the given ID from the specified ARIA attribute on an element. |
| * Used for attributes such as aria-labelledby, aria-owns, etc. |
| */ |
| export function removeAriaReferencedId(el, attr, id) { |
| const ids = getAriaReferenceIds(el, attr); |
| const filteredIds = ids.filter(val => val != id.trim()); |
| if (filteredIds.length) { |
| el.setAttribute(attr, filteredIds.join(ID_DELIMITER)); |
| } |
| else { |
| el.removeAttribute(attr); |
| } |
| } |
| /** |
| * Gets the list of IDs referenced by the given ARIA attribute on an element. |
| * Used for attributes such as aria-labelledby, aria-owns, etc. |
| */ |
| export function getAriaReferenceIds(el, attr) { |
| // Get string array of all individual ids (whitespace delimited) in the attribute value |
| return (el.getAttribute(attr) || '').match(/\S+/g) || []; |
| } |
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