@angular/core
Version:
Angular - the core framework
364 lines • 42.7 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 { Injector } from '../../di/injector';
import { assertLView } from '../assert';
import { discoverLocalRefs, getComponentAtNodeIndex, getDirectivesAtNodeIndex, getLContext } from '../context_discovery';
import { NodeInjector } from '../di';
import { buildDebugNode } from '../instructions/lview_debug';
import { isLView } from '../interfaces/type_checks';
import { CLEANUP, CONTEXT, FLAGS, HEADER_OFFSET, HOST, T_HOST, TVIEW } from '../interfaces/view';
import { stringifyForError } from './misc_utils';
import { getLViewParent, getRootContext } from './view_traversal_utils';
import { getTNode, unwrapRNode } from './view_utils';
/**
* Retrieves the component instance associated with a given DOM element.
*
* @usageNotes
* Given the following DOM structure:
* ```html
* <my-app>
* <div>
* <child-comp></child-comp>
* </div>
* </my-app>
* ```
* Calling `getComponent` on `<child-comp>` will return the instance of `ChildComponent`
* associated with this DOM element.
*
* Calling the function on `<my-app>` will return the `MyApp` instance.
*
*
* @param element DOM element from which the component should be retrieved.
* @returns Component instance associated with the element or `null` if there
* is no component associated with it.
*
* @publicApi
* @globalApi ng
*/
export function getComponent(element) {
assertDomElement(element);
const context = loadLContext(element, false);
if (context === null)
return null;
if (context.component === undefined) {
context.component = getComponentAtNodeIndex(context.nodeIndex, context.lView);
}
return context.component;
}
/**
* If inside an embedded view (e.g. `*ngIf` or `*ngFor`), retrieves the context of the embedded
* view that the element is part of. Otherwise retrieves the instance of the component whose view
* owns the element (in this case, the result is the same as calling `getOwningComponent`).
*
* @param element Element for which to get the surrounding component instance.
* @returns Instance of the component that is around the element or null if the element isn't
* inside any component.
*
* @publicApi
* @globalApi ng
*/
export function getContext(element) {
assertDomElement(element);
const context = loadLContext(element, false);
return context === null ? null : context.lView[CONTEXT];
}
/**
* Retrieves the component instance whose view contains the DOM element.
*
* For example, if `<child-comp>` is used in the template of `<app-comp>`
* (i.e. a `ViewChild` of `<app-comp>`), calling `getOwningComponent` on `<child-comp>`
* would return `<app-comp>`.
*
* @param elementOrDir DOM element, component or directive instance
* for which to retrieve the root components.
* @returns Component instance whose view owns the DOM element or null if the element is not
* part of a component view.
*
* @publicApi
* @globalApi ng
*/
export function getOwningComponent(elementOrDir) {
const context = loadLContext(elementOrDir, false);
if (context === null)
return null;
let lView = context.lView;
let parent;
ngDevMode && assertLView(lView);
while (lView[HOST] === null && (parent = getLViewParent(lView))) {
// As long as lView[HOST] is null we know we are part of sub-template such as `*ngIf`
lView = parent;
}
return lView[FLAGS] & 512 /* IsRoot */ ? null : lView[CONTEXT];
}
/**
* Retrieves all root components associated with a DOM element, directive or component instance.
* Root components are those which have been bootstrapped by Angular.
*
* @param elementOrDir DOM element, component or directive instance
* for which to retrieve the root components.
* @returns Root components associated with the target object.
*
* @publicApi
* @globalApi ng
*/
export function getRootComponents(elementOrDir) {
return [...getRootContext(elementOrDir).components];
}
/**
* Retrieves an `Injector` associated with an element, component or directive instance.
*
* @param elementOrDir DOM element, component or directive instance for which to
* retrieve the injector.
* @returns Injector associated with the element, component or directive instance.
*
* @publicApi
* @globalApi ng
*/
export function getInjector(elementOrDir) {
const context = loadLContext(elementOrDir, false);
if (context === null)
return Injector.NULL;
const tNode = context.lView[TVIEW].data[context.nodeIndex];
return new NodeInjector(tNode, context.lView);
}
/**
* Retrieve a set of injection tokens at a given DOM node.
*
* @param element Element for which the injection tokens should be retrieved.
*/
export function getInjectionTokens(element) {
const context = loadLContext(element, false);
if (context === null)
return [];
const lView = context.lView;
const tView = lView[TVIEW];
const tNode = tView.data[context.nodeIndex];
const providerTokens = [];
const startIndex = tNode.providerIndexes & 65535 /* ProvidersStartIndexMask */;
const endIndex = tNode.directiveEnd;
for (let i = startIndex; i < endIndex; i++) {
let value = tView.data[i];
if (isDirectiveDefHack(value)) {
// The fact that we sometimes store Type and sometimes DirectiveDef in this location is a
// design flaw. We should always store same type so that we can be monomorphic. The issue
// is that for Components/Directives we store the def instead the type. The correct behavior
// is that we should always be storing injectable type in this location.
value = value.type;
}
providerTokens.push(value);
}
return providerTokens;
}
/**
* Retrieves directive instances associated with a given DOM element. Does not include
* component instances.
*
* @usageNotes
* Given the following DOM structure:
* ```
* <my-app>
* <button my-button></button>
* <my-comp></my-comp>
* </my-app>
* ```
* Calling `getDirectives` on `<button>` will return an array with an instance of the `MyButton`
* directive that is associated with the DOM element.
*
* Calling `getDirectives` on `<my-comp>` will return an empty array.
*
* @param element DOM element for which to get the directives.
* @returns Array of directives associated with the element.
*
* @publicApi
* @globalApi ng
*/
export function getDirectives(element) {
const context = loadLContext(element);
if (context.directives === undefined) {
context.directives = getDirectivesAtNodeIndex(context.nodeIndex, context.lView, false);
}
// The `directives` in this case are a named array called `LComponentView`. Clone the
// result so we don't expose an internal data structure in the user's console.
return context.directives === null ? [] : [...context.directives];
}
export function loadLContext(target, throwOnNotFound = true) {
const context = getLContext(target);
if (!context && throwOnNotFound) {
throw new Error(ngDevMode ? `Unable to find context associated with ${stringifyForError(target)}` :
'Invalid ng target');
}
return context;
}
/**
* Retrieve map of local references.
*
* The references are retrieved as a map of local reference name to element or directive instance.
*
* @param target DOM element, component or directive instance for which to retrieve
* the local references.
*/
export function getLocalRefs(target) {
const context = loadLContext(target, false);
if (context === null)
return {};
if (context.localRefs === undefined) {
context.localRefs = discoverLocalRefs(context.lView, context.nodeIndex);
}
return context.localRefs || {};
}
/**
* Retrieves the host element of a component or directive instance.
* The host element is the DOM element that matched the selector of the directive.
*
* @param componentOrDirective Component or directive instance for which the host
* element should be retrieved.
* @returns Host element of the target.
*
* @publicApi
* @globalApi ng
*/
export function getHostElement(componentOrDirective) {
return getLContext(componentOrDirective).native;
}
/**
* Retrieves the rendered text for a given component.
*
* This function retrieves the host element of a component and
* and then returns the `textContent` for that element. This implies
* that the text returned will include re-projected content of
* the component as well.
*
* @param component The component to return the content text for.
*/
export function getRenderedText(component) {
const hostElement = getHostElement(component);
return hostElement.textContent || '';
}
export function loadLContextFromNode(node) {
if (!(node instanceof Node))
throw new Error('Expecting instance of DOM Element');
return loadLContext(node);
}
/**
* Retrieves a list of event listeners associated with a DOM element. The list does include host
* listeners, but it does not include event listeners defined outside of the Angular context
* (e.g. through `addEventListener`).
*
* @usageNotes
* Given the following DOM structure:
* ```
* <my-app>
* <div (click)="doSomething()"></div>
* </my-app>
*
* ```
* Calling `getListeners` on `<div>` will return an object that looks as follows:
* ```
* {
* name: 'click',
* element: <div>,
* callback: () => doSomething(),
* useCapture: false
* }
* ```
*
* @param element Element for which the DOM listeners should be retrieved.
* @returns Array of event listeners on the DOM element.
*
* @publicApi
* @globalApi ng
*/
export function getListeners(element) {
assertDomElement(element);
const lContext = loadLContext(element, false);
if (lContext === null)
return [];
const lView = lContext.lView;
const tView = lView[TVIEW];
const lCleanup = lView[CLEANUP];
const tCleanup = tView.cleanup;
const listeners = [];
if (tCleanup && lCleanup) {
for (let i = 0; i < tCleanup.length;) {
const firstParam = tCleanup[i++];
const secondParam = tCleanup[i++];
if (typeof firstParam === 'string') {
const name = firstParam;
const listenerElement = unwrapRNode(lView[secondParam]);
const callback = lCleanup[tCleanup[i++]];
const useCaptureOrIndx = tCleanup[i++];
// if useCaptureOrIndx is boolean then report it as is.
// if useCaptureOrIndx is positive number then it in unsubscribe method
// if useCaptureOrIndx is negative number then it is a Subscription
const type = (typeof useCaptureOrIndx === 'boolean' || useCaptureOrIndx >= 0) ? 'dom' : 'output';
const useCapture = typeof useCaptureOrIndx === 'boolean' ? useCaptureOrIndx : false;
if (element == listenerElement) {
listeners.push({ element, name, callback, useCapture, type });
}
}
}
}
listeners.sort(sortListeners);
return listeners;
}
function sortListeners(a, b) {
if (a.name == b.name)
return 0;
return a.name < b.name ? -1 : 1;
}
/**
* This function should not exist because it is megamorphic and only mostly correct.
*
* See call site for more info.
*/
function isDirectiveDefHack(obj) {
return obj.type !== undefined && obj.template !== undefined && obj.declaredInputs !== undefined;
}
/**
* Returns the attached `DebugNode` instance for an element in the DOM.
*
* @param element DOM element which is owned by an existing component's view.
*/
export function getDebugNode(element) {
let debugNode = null;
const lContext = loadLContextFromNode(element);
const lView = lContext.lView;
const nodeIndex = lContext.nodeIndex;
if (nodeIndex !== -1) {
const valueInLView = lView[nodeIndex];
// this means that value in the lView is a component with its own
// data. In this situation the TNode is not accessed at the same spot.
const tNode = isLView(valueInLView) ? valueInLView[T_HOST] :
getTNode(lView[TVIEW], nodeIndex - HEADER_OFFSET);
debugNode = buildDebugNode(tNode, lView, nodeIndex);
}
return debugNode;
}
/**
* Retrieve the component `LView` from component/element.
*
* NOTE: `LView` is a private and should not be leaked outside.
* Don't export this method to `ng.*` on window.
*
* @param target DOM element or component instance for which to retrieve the LView.
*/
export function getComponentLView(target) {
const lContext = loadLContext(target);
const nodeIndx = lContext.nodeIndex;
const lView = lContext.lView;
const componentLView = lView[nodeIndx];
ngDevMode && assertLView(componentLView);
return componentLView;
}
/** Asserts that a value is a DOM Element. */
function assertDomElement(value) {
if (typeof Element !== 'undefined' && !(value instanceof Element)) {
throw new Error('Expecting instance of DOM Element');
}
}
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'./view_traversal_utils';\nimport {getTNode, unwrapRNode} from './view_utils';\n\n\n\n/**\n * Retrieves the component instance associated with a given DOM element.\n *\n * @usageNotes\n * Given the following DOM structure:\n * ```html\n * <my-app>\n *   <div>\n *     <child-comp></child-comp>\n *   </div>\n * </my-app>\n * ```\n * Calling `getComponent` on `<child-comp>` will return the instance of `ChildComponent`\n * associated with this DOM element.\n *\n * Calling the function on `<my-app>` will return the `MyApp` instance.\n *\n *\n * @param element DOM element from which the component should be retrieved.\n * @returns Component instance associated with the element or `null` if there\n *    is no component associated with it.\n *\n * @publicApi\n * @globalApi ng\n */\nexport function getComponent<T>(element: Element): T|null {\n  assertDomElement(element);\n  const context = loadLContext(element, false);\n  if (context === null) return null;\n\n  if (context.component === undefined) {\n    context.component = getComponentAtNodeIndex(context.nodeIndex, context.lView);\n  }\n\n  return context.component as T;\n}\n\n\n/**\n * If inside an embedded view (e.g. `*ngIf` or `*ngFor`), retrieves the context of the embedded\n * view that the element is part of. 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We should always store same type so that we can be monomorphic. The issue\n      // is that for Components/Directives we store the def instead the type. The correct behavior\n      // is that we should always be storing injectable type in this location.\n      value = value.type;\n    }\n    providerTokens.push(value);\n  }\n  return providerTokens;\n}\n\n/**\n * Retrieves directive instances associated with a given DOM element. 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[] : [...context.directives];\n}\n\n/**\n * Returns LContext associated with a target passed as an argument.\n * Throws if a given target doesn't have associated LContext.\n */\nexport function loadLContext(target: {}): LContext;\nexport function loadLContext(target: {}, throwOnNotFound: false): LContext|null;\nexport function loadLContext(target: {}, throwOnNotFound: boolean = true): LContext|null {\n  const context = getLContext(target);\n  if (!context && throwOnNotFound) {\n    throw new Error(\n        ngDevMode ? `Unable to find context associated with ${stringifyForError(target)}` :\n                    'Invalid ng target');\n  }\n  return context;\n}\n\n/**\n * Retrieve map of local references.\n *\n * The references are retrieved as a map of local reference name to element or directive instance.\n *\n * @param target DOM element, component or directive instance for which to retrieve\n *    the local references.\n */\nexport function getLocalRefs(target: {}): {[key: string]: any} {\n  const context = loadLContext(target, false);\n  if (context === null) return {};\n\n  if (context.localRefs === undefined) {\n    context.localRefs = discoverLocalRefs(context.lView, context.nodeIndex);\n  }\n\n  return context.localRefs || {};\n}\n\n/**\n * Retrieves the host element of a component or directive instance.\n * The host element is the DOM element that matched the selector of the directive.\n *\n * @param componentOrDirective Component or directive instance for which the host\n *     element should be retrieved.\n * @returns Host element of the target.\n *\n * @publicApi\n * @globalApi ng\n */\nexport function getHostElement(componentOrDirective: {}): Element {\n  return getLContext(componentOrDirective)!.native as never as Element;\n}\n\n/**\n * Retrieves the rendered text for a given component.\n *\n * This function retrieves the host element of a component and\n * and then returns the `textContent` for that element. This implies\n * that the text returned will include re-projected content of\n * the component as well.\n *\n * @param component The component to return the content text for.\n */\nexport function getRenderedText(component: any): string {\n  const hostElement = getHostElement(component);\n  return hostElement.textContent || '';\n}\n\nexport function loadLContextFromNode(node: Node): LContext {\n  if (!(node instanceof Node)) throw new Error('Expecting instance of DOM Element');\n  return loadLContext(node)!;\n}\n\n/**\n * Event listener configuration returned from `getListeners`.\n * @publicApi\n */\nexport interface Listener {\n  /** Name of the event listener. */\n  name: string;\n  /** Element that the listener is bound to. */\n  element: Element;\n  /** Callback that is invoked when the event is triggered. */\n  callback: (value: any) => any;\n  /** Whether the listener is using event capturing. */\n  useCapture: boolean;\n  /**\n   * Type of the listener (e.g. a native DOM event or a custom @Output).\n   */\n  type: 'dom'|'output';\n}\n\n\n/**\n * Retrieves a list of event listeners associated with a DOM element. The list does include host\n * listeners, but it does not include event listeners defined outside of the Angular context\n * (e.g. through `addEventListener`).\n *\n * @usageNotes\n * Given the following DOM structure:\n * ```\n * <my-app>\n *   <div (click)=\"doSomething()\"></div>\n * </my-app>\n *\n * ```\n * Calling `getListeners` on `<div>` will return an object that looks as follows:\n * ```\n * {\n *   name: 'click',\n *   element: <div>,\n *   callback: () => doSomething(),\n *   useCapture: false\n * }\n * ```\n *\n * @param element Element for which the DOM listeners should be retrieved.\n * @returns Array of event listeners on the DOM element.\n *\n * @publicApi\n * @globalApi ng\n */\nexport function getListeners(element: Element): Listener[] {\n  assertDomElement(element);\n  const lContext = loadLContext(element, false);\n  if (lContext === null) return [];\n\n  const lView = lContext.lView;\n  const tView = lView[TVIEW];\n  const lCleanup = lView[CLEANUP];\n  const tCleanup = tView.cleanup;\n  const listeners: Listener[] = [];\n  if (tCleanup && lCleanup) {\n    for (let i = 0; i < tCleanup.length;) {\n      const firstParam = tCleanup[i++];\n      const secondParam = tCleanup[i++];\n      if (typeof firstParam === 'string') {\n        const name: string = firstParam;\n        const listenerElement = unwrapRNode(lView[secondParam]) as any as Element;\n        const callback: (value: any) => any = lCleanup[tCleanup[i++]];\n        const useCaptureOrIndx = tCleanup[i++];\n        // if useCaptureOrIndx is boolean then report it as is.\n        // if useCaptureOrIndx is positive number then it in unsubscribe method\n        // if useCaptureOrIndx is negative number then it is a Subscription\n        const type =\n            (typeof useCaptureOrIndx === 'boolean' || useCaptureOrIndx >= 0) ? 'dom' : 'output';\n        const useCapture = typeof useCaptureOrIndx === 'boolean' ? useCaptureOrIndx : false;\n        if (element == listenerElement) {\n          listeners.push({element, name, callback, useCapture, type});\n        }\n      }\n    }\n  }\n  listeners.sort(sortListeners);\n  return listeners;\n}\n\nfunction sortListeners(a: Listener, b: Listener) {\n  if (a.name == b.name) return 0;\n  return a.name < b.name ? -1 : 1;\n}\n\n/**\n * This function should not exist because it is megamorphic and only mostly correct.\n *\n * See call site for more info.\n */\nfunction isDirectiveDefHack(obj: any): obj is DirectiveDef<any> {\n  return obj.type !== undefined && obj.template !== undefined && obj.declaredInputs !== undefined;\n}\n\n/**\n * Returns the attached `DebugNode` instance for an element in the DOM.\n *\n * @param element DOM element which is owned by an existing component's view.\n */\nexport function getDebugNode(element: Element): DebugNode|null {\n  let debugNode: DebugNode|null = null;\n\n  const lContext = loadLContextFromNode(element);\n  const lView = lContext.lView;\n  const nodeIndex = lContext.nodeIndex;\n  if (nodeIndex !== -1) {\n    const valueInLView = lView[nodeIndex];\n    // this means that value in the lView is a component with its own\n    // data. In this situation the TNode is not accessed at the same spot.\n    const tNode = isLView(valueInLView) ? (valueInLView[T_HOST] as TNode) :\n                                          getTNode(lView[TVIEW], nodeIndex - HEADER_OFFSET);\n    debugNode = buildDebugNode(tNode, lView, nodeIndex);\n  }\n\n  return debugNode;\n}\n\n/**\n * Retrieve the component `LView` from component/element.\n *\n * NOTE: `LView` is a private and should not be leaked outside.\n *       Don't export this method to `ng.*` on window.\n *\n * @param target DOM element or component instance for which to retrieve the LView.\n */\nexport function getComponentLView(target: any): LView {\n  const lContext = loadLContext(target);\n  const nodeIndx = lContext.nodeIndex;\n  const lView = lContext.lView;\n  const componentLView = lView[nodeIndx];\n  ngDevMode && assertLView(componentLView);\n  return componentLView;\n}\n\n/** Asserts that a value is a DOM Element. */\nfunction assertDomElement(value: any) {\n  if (typeof Element !== 'undefined' && !(value instanceof Element)) {\n    throw new Error('Expecting instance of DOM Element');\n  }\n}\n"]}