@angular/cdk
Version:
Angular Material Component Development Kit
228 lines • 27.8 kB
JavaScript
/**
* @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
*/
import { Platform } from '@angular/cdk/platform';
import { Injectable } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
// The InteractivityChecker leans heavily on the ally.js accessibility utilities.
// Methods like `isTabbable` are only covering specific edge-cases for the browsers which are
// supported.
/**
* Utility for checking the interactivity of an element, such as whether is is focusable or
* tabbable.
*/
export class InteractivityChecker {
constructor(_platform) {
this._platform = _platform;
}
/**
* Gets whether an element is disabled.
*
* @param element Element to be checked.
* @returns Whether the element is disabled.
*/
isDisabled(element) {
// This does not capture some cases, such as a non-form control with a disabled attribute or
// a form control inside of a disabled form, but should capture the most common cases.
return element.hasAttribute('disabled');
}
/**
* Gets whether an element is visible for the purposes of interactivity.
*
* This will capture states like `display: none` and `visibility: hidden`, but not things like
* being clipped by an `overflow: hidden` parent or being outside the viewport.
*
* @returns Whether the element is visible.
*/
isVisible(element) {
return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';
}
/**
* Gets whether an element can be reached via Tab key.
* Assumes that the element has already been checked with isFocusable.
*
* @param element Element to be checked.
* @returns Whether the element is tabbable.
*/
isTabbable(element) {
// Nothing is tabbable on the server 😎
if (!this._platform.isBrowser) {
return false;
}
const frameElement = getFrameElement(getWindow(element));
if (frameElement) {
const frameType = frameElement && frameElement.nodeName.toLowerCase();
// Frame elements inherit their tabindex onto all child elements.
if (getTabIndexValue(frameElement) === -1) {
return false;
}
// Webkit and Blink consider anything inside of an <object> element as non-tabbable.
if ((this._platform.BLINK || this._platform.WEBKIT) && frameType === 'object') {
return false;
}
// Webkit and Blink disable tabbing to an element inside of an invisible frame.
if ((this._platform.BLINK || this._platform.WEBKIT) && !this.isVisible(frameElement)) {
return false;
}
}
let nodeName = element.nodeName.toLowerCase();
let tabIndexValue = getTabIndexValue(element);
if (element.hasAttribute('contenteditable')) {
return tabIndexValue !== -1;
}
if (nodeName === 'iframe') {
// The frames may be tabbable depending on content, but it's not possibly to reliably
// investigate the content of the frames.
return false;
}
if (nodeName === 'audio') {
if (!element.hasAttribute('controls')) {
// By default an <audio> element without the controls enabled is not tabbable.
return false;
}
else if (this._platform.BLINK) {
// In Blink <audio controls> elements are always tabbable.
return true;
}
}
if (nodeName === 'video') {
if (!element.hasAttribute('controls') && this._platform.TRIDENT) {
// In Trident a <video> element without the controls enabled is not tabbable.
return false;
}
else if (this._platform.BLINK || this._platform.FIREFOX) {
// In Chrome and Firefox <video controls> elements are always tabbable.
return true;
}
}
if (nodeName === 'object' && (this._platform.BLINK || this._platform.WEBKIT)) {
// In all Blink and WebKit based browsers <object> elements are never tabbable.
return false;
}
// In iOS the browser only considers some specific elements as tabbable.
if (this._platform.WEBKIT && this._platform.IOS && !isPotentiallyTabbableIOS(element)) {
return false;
}
return element.tabIndex >= 0;
}
/**
* Gets whether an element can be focused by the user.
*
* @param element Element to be checked.
* @returns Whether the element is focusable.
*/
isFocusable(element) {
// Perform checks in order of left to most expensive.
// Again, naive approach that does not capture many edge cases and browser quirks.
return isPotentiallyFocusable(element) && !this.isDisabled(element) && this.isVisible(element);
}
}
InteractivityChecker.ɵprov = i0.ɵɵdefineInjectable({ factory: function InteractivityChecker_Factory() { return new InteractivityChecker(i0.ɵɵinject(i1.Platform)); }, token: InteractivityChecker, providedIn: "root" });
InteractivityChecker.decorators = [
{ type: Injectable, args: [{ providedIn: 'root' },] }
];
InteractivityChecker.ctorParameters = () => [
{ type: Platform }
];
/**
* Returns the frame element from a window object. Since browsers like MS Edge throw errors if
* the frameElement property is being accessed from a different host address, this property
* should be accessed carefully.
*/
function getFrameElement(window) {
try {
return window.frameElement;
}
catch (_a) {
return null;
}
}
/** Checks whether the specified element has any geometry / rectangles. */
function hasGeometry(element) {
// Use logic from jQuery to check for an invisible element.
// See https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js#L12
return !!(element.offsetWidth || element.offsetHeight ||
(typeof element.getClientRects === 'function' && element.getClientRects().length));
}
/** Gets whether an element's */
function isNativeFormElement(element) {
let nodeName = element.nodeName.toLowerCase();
return nodeName === 'input' ||
nodeName === 'select' ||
nodeName === 'button' ||
nodeName === 'textarea';
}
/** Gets whether an element is an `<input type="hidden">`. */
function isHiddenInput(element) {
return isInputElement(element) && element.type == 'hidden';
}
/** Gets whether an element is an anchor that has an href attribute. */
function isAnchorWithHref(element) {
return isAnchorElement(element) && element.hasAttribute('href');
}
/** Gets whether an element is an input element. */
function isInputElement(element) {
return element.nodeName.toLowerCase() == 'input';
}
/** Gets whether an element is an anchor element. */
function isAnchorElement(element) {
return element.nodeName.toLowerCase() == 'a';
}
/** Gets whether an element has a valid tabindex. */
function hasValidTabIndex(element) {
if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {
return false;
}
let tabIndex = element.getAttribute('tabindex');
// IE11 parses tabindex="" as the value "-32768"
if (tabIndex == '-32768') {
return false;
}
return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));
}
/**
* Returns the parsed tabindex from the element attributes instead of returning the
* evaluated tabindex from the browsers defaults.
*/
function getTabIndexValue(element) {
if (!hasValidTabIndex(element)) {
return null;
}
// See browser issue in Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
const tabIndex = parseInt(element.getAttribute('tabindex') || '', 10);
return isNaN(tabIndex) ? -1 : tabIndex;
}
/** Checks whether the specified element is potentially tabbable on iOS */
function isPotentiallyTabbableIOS(element) {
let nodeName = element.nodeName.toLowerCase();
let inputType = nodeName === 'input' && element.type;
return inputType === 'text'
|| inputType === 'password'
|| nodeName === 'select'
|| nodeName === 'textarea';
}
/**
* Gets whether an element is potentially focusable without taking current visible/disabled state
* into account.
*/
function isPotentiallyFocusable(element) {
// Inputs are potentially focusable *unless* they're type="hidden".
if (isHiddenInput(element)) {
return false;
}
return isNativeFormElement(element) ||
isAnchorWithHref(element) ||
element.hasAttribute('contenteditable') ||
hasValidTabIndex(element);
}
/** Gets the parent window of a DOM node with regards of being inside of an iframe. */
function getWindow(node) {
// ownerDocument is null if `node` itself *is* a document.
return node.ownerDocument && node.ownerDocument.defaultView || window;
}
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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Platform} from '@angular/cdk/platform';\nimport {Injectable} from '@angular/core';\n\n\n// The InteractivityChecker leans heavily on the ally.js accessibility utilities.\n// Methods like `isTabbable` are only covering specific edge-cases for the browsers which are\n// supported.\n\n/**\n * Utility for checking the interactivity of an element, such as whether is is focusable or\n * tabbable.\n */\n@Injectable({providedIn: 'root'})\nexport class InteractivityChecker {\n\n  constructor(private _platform: Platform) {}\n\n  /**\n   * Gets whether an element is disabled.\n   *\n   * @param element Element to be checked.\n   * @returns Whether the element is disabled.\n   */\n  isDisabled(element: HTMLElement): boolean {\n    // This does not capture some cases, such as a non-form control with a disabled attribute or\n    // a form control inside of a disabled form, but should capture the most common cases.\n    return element.hasAttribute('disabled');\n  }\n\n  /**\n   * Gets whether an element is visible for the purposes of interactivity.\n   *\n   * This will capture states like `display: none` and `visibility: hidden`, but not things like\n   * being clipped by an `overflow: hidden` parent or being outside the viewport.\n   *\n   * @returns Whether the element is visible.\n   */\n  isVisible(element: HTMLElement): boolean {\n    return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';\n  }\n\n  /**\n   * Gets whether an element can be reached via Tab key.\n   * Assumes that the element has already been checked with isFocusable.\n   *\n   * @param element Element to be checked.\n   * @returns Whether the element is tabbable.\n   */\n  isTabbable(element: HTMLElement): boolean {\n    // Nothing is tabbable on the server 😎\n    if (!this._platform.isBrowser) {\n      return false;\n    }\n\n    const frameElement = getFrameElement(getWindow(element));\n\n    if (frameElement) {\n      const frameType = frameElement && frameElement.nodeName.toLowerCase();\n\n      // Frame elements inherit their tabindex onto all child elements.\n      if (getTabIndexValue(frameElement) === -1) {\n        return false;\n      }\n\n      // Webkit and Blink consider anything inside of an <object> element as non-tabbable.\n      if ((this._platform.BLINK || this._platform.WEBKIT) && frameType === 'object') {\n        return false;\n      }\n\n      // Webkit and Blink disable tabbing to an element inside of an invisible frame.\n      if ((this._platform.BLINK || this._platform.WEBKIT) && !this.isVisible(frameElement)) {\n        return false;\n      }\n\n    }\n\n    let nodeName = element.nodeName.toLowerCase();\n    let tabIndexValue = getTabIndexValue(element);\n\n    if (element.hasAttribute('contenteditable')) {\n      return tabIndexValue !== -1;\n    }\n\n    if (nodeName === 'iframe') {\n      // The frames may be tabbable depending on content, but it's not possibly to reliably\n      // investigate the content of the frames.\n      return false;\n    }\n\n    if (nodeName === 'audio') {\n      if (!element.hasAttribute('controls')) {\n        // By default an <audio> element without the controls enabled is not tabbable.\n        return false;\n      } else if (this._platform.BLINK) {\n        // In Blink <audio controls> elements are always tabbable.\n        return true;\n      }\n    }\n\n    if (nodeName === 'video') {\n      if (!element.hasAttribute('controls') && this._platform.TRIDENT) {\n        // In Trident a <video> element without the controls enabled is not tabbable.\n        return false;\n      } else if (this._platform.BLINK || this._platform.FIREFOX) {\n        // In Chrome and Firefox <video controls> elements are always tabbable.\n        return true;\n      }\n    }\n\n    if (nodeName === 'object' && (this._platform.BLINK || this._platform.WEBKIT)) {\n      // In all Blink and WebKit based browsers <object> elements are never tabbable.\n      return false;\n    }\n\n    // In iOS the browser only considers some specific elements as tabbable.\n    if (this._platform.WEBKIT && this._platform.IOS && !isPotentiallyTabbableIOS(element)) {\n      return false;\n    }\n\n    return element.tabIndex >= 0;\n  }\n\n  /**\n   * Gets whether an element can be focused by the user.\n   *\n   * @param element Element to be checked.\n   * @returns Whether the element is focusable.\n   */\n  isFocusable(element: HTMLElement): boolean {\n    // Perform checks in order of left to most expensive.\n    // Again, naive approach that does not capture many edge cases and browser quirks.\n    return isPotentiallyFocusable(element) && !this.isDisabled(element) && this.isVisible(element);\n  }\n\n}\n\n/**\n * Returns the frame element from a window object. Since browsers like MS Edge throw errors if\n * the frameElement property is being accessed from a different host address, this property\n * should be accessed carefully.\n */\nfunction getFrameElement(window: Window) {\n  try {\n    return window.frameElement as HTMLElement;\n  } catch {\n    return null;\n  }\n}\n\n/** Checks whether the specified element has any geometry / rectangles. */\nfunction hasGeometry(element: HTMLElement): boolean {\n  // Use logic from jQuery to check for an invisible element.\n  // See https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js#L12\n  return !!(element.offsetWidth || element.offsetHeight ||\n      (typeof element.getClientRects === 'function' && element.getClientRects().length));\n}\n\n/** Gets whether an element's  */\nfunction isNativeFormElement(element: Node) {\n  let nodeName = element.nodeName.toLowerCase();\n  return nodeName === 'input' ||\n      nodeName === 'select' ||\n      nodeName === 'button' ||\n      nodeName === 'textarea';\n}\n\n/** Gets whether an element is an `<input type=\"hidden\">`. */\nfunction isHiddenInput(element: HTMLElement): boolean {\n  return isInputElement(element) && element.type == 'hidden';\n}\n\n/** Gets whether an element is an anchor that has an href attribute. */\nfunction isAnchorWithHref(element: HTMLElement): boolean {\n  return isAnchorElement(element) && element.hasAttribute('href');\n}\n\n/** Gets whether an element is an input element. */\nfunction isInputElement(element: HTMLElement): element is HTMLInputElement {\n  return element.nodeName.toLowerCase() == 'input';\n}\n\n/** Gets whether an element is an anchor element. */\nfunction isAnchorElement(element: HTMLElement): element is HTMLAnchorElement {\n  return element.nodeName.toLowerCase() == 'a';\n}\n\n/** Gets whether an element has a valid tabindex. */\nfunction hasValidTabIndex(element: HTMLElement): boolean {\n  if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {\n    return false;\n  }\n\n  let tabIndex = element.getAttribute('tabindex');\n\n  // IE11 parses tabindex=\"\" as the value \"-32768\"\n  if (tabIndex == '-32768') {\n    return false;\n  }\n\n  return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));\n}\n\n/**\n * Returns the parsed tabindex from the element attributes instead of returning the\n * evaluated tabindex from the browsers defaults.\n */\nfunction getTabIndexValue(element: HTMLElement): number | null {\n  if (!hasValidTabIndex(element)) {\n    return null;\n  }\n\n  // See browser issue in Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054\n  const tabIndex = parseInt(element.getAttribute('tabindex') || '', 10);\n\n  return isNaN(tabIndex) ? -1 : tabIndex;\n}\n\n/** Checks whether the specified element is potentially tabbable on iOS */\nfunction isPotentiallyTabbableIOS(element: HTMLElement): boolean {\n  let nodeName = element.nodeName.toLowerCase();\n  let inputType = nodeName === 'input' && (element as HTMLInputElement).type;\n\n  return inputType === 'text'\n      || inputType === 'password'\n      || nodeName === 'select'\n      || nodeName === 'textarea';\n}\n\n/**\n * Gets whether an element is potentially focusable without taking current visible/disabled state\n * into account.\n */\nfunction isPotentiallyFocusable(element: HTMLElement): boolean {\n  // Inputs are potentially focusable *unless* they're type=\"hidden\".\n  if (isHiddenInput(element)) {\n    return false;\n  }\n\n  return isNativeFormElement(element) ||\n      isAnchorWithHref(element) ||\n      element.hasAttribute('contenteditable') ||\n      hasValidTabIndex(element);\n}\n\n/** Gets the parent window of a DOM node with regards of being inside of an iframe. */\nfunction getWindow(node: HTMLElement): Window {\n  // ownerDocument is null if `node` itself *is* a document.\n  return node.ownerDocument && node.ownerDocument.defaultView || window;\n}\n"]}