ngx-intersection-observer/fesm2015/ngx-intersection-observer.mjs.map

Intersection observer for Angular

{"version":3,"file":"ngx-intersection-observer.mjs","sources":["../../../projects/intersection-observer/src/lib/intersection-observer-config.model.ts","../../../projects/intersection-observer/src/lib/intersection-observer.service.ts","../../../projects/intersection-observer/src/lib/intersection-observer.directive.ts","../../../projects/intersection-observer/src/lib/intersection-observer.module.ts","../../../projects/intersection-observer/src/public-api.ts","../../../projects/intersection-observer/src/ngx-intersection-observer.ts"],"sourcesContent":["export class IntersectionObserverConfig {\r\n  /** Debounces the intersection check. */\r\n  debounce: number = 50;\r\n  /** Specifies how many precentage of the element need to be visible to treat it as intersection. */\r\n  threshold: number = 30;\r\n  /** Automatically remove classes from the element. */\r\n  autoRemove: boolean = true;\r\n  /**  Scroll Listener, false = IntersectionObserver */\r\n  useScroll: boolean = false;\r\n}\r\n","import { Injectable, OnDestroy, Optional } from '@angular/core';\r\nimport { debounceTime, distinctUntilChanged, EMPTY, fromEvent, merge, Observable, ReplaySubject, Subscription } from 'rxjs';\r\nimport { IntersectionObserverConfig } from './intersection-observer-config.model';\r\n\r\n@Injectable({\r\n  providedIn: 'root'\r\n})\r\nexport class IntersectionObserverService implements OnDestroy {\r\n  private _windowScrollY$: ReplaySubject<number> = new ReplaySubject<number>();\r\n  private _windowResize$: ReplaySubject<number> = new ReplaySubject<number>();\r\n  private _windowViewportChange$: ReplaySubject<number> = new ReplaySubject<number>();\r\n  private _pageYOffset: number = 0;\r\n  private _config: IntersectionObserverConfig;\r\n\r\n  private onScroll$: Observable<any>;\r\n  private onResize$: Observable<any>;\r\n\r\n  private scrollSub: Subscription;\r\n  private resizeSub: Subscription;\r\n  private viewportChangeSub: Subscription;\r\n\r\n  constructor(@Optional() private intersectionObserverConfig?: IntersectionObserverConfig) {\r\n\r\n    // Get the config or default\r\n    this._config = intersectionObserverConfig ? intersectionObserverConfig : {\r\n      debounce: 10,\r\n      threshold: 20\r\n    } as IntersectionObserverConfig;\r\n\r\n    // Manage scroll position initially\r\n    this.manageScrollPos();\r\n\r\n    // Subscribe to window scroll event and debounce it\r\n    this.onScroll$ =\r\n      typeof window !== \"undefined\" ? fromEvent(window, \"scroll\") : EMPTY;\r\n    this.scrollSub = this.onScroll$\r\n      .pipe(\r\n        debounceTime(this._config.debounce),\r\n        distinctUntilChanged())\r\n      .subscribe(t => {\r\n        this.manageScrollPos();\r\n        this._windowScrollY$.next(this._pageYOffset);\r\n      });\r\n\r\n    // Subscribe to window resize event and debounce it\r\n    this.onResize$ =\r\n      typeof window !== \"undefined\" ? fromEvent(window, \"resize\") : EMPTY;\r\n    this.resizeSub = this.onResize$\r\n      .pipe(\r\n        debounceTime(this._config.debounce),\r\n        distinctUntilChanged())\r\n      .subscribe(t => {\r\n        this.manageScrollPos();\r\n        this._windowResize$.next(this._pageYOffset);\r\n      });\r\n\r\n    // Observable that fires on scroll or resize\r\n    this.viewportChangeSub = merge(this._windowScrollY$, this._windowResize$)\r\n      .subscribe(t => {\r\n        this._windowViewportChange$.next(this._pageYOffset);\r\n      });\r\n  }\r\n\r\n  /** Gets the page offset Y axis */\r\n  get pageYOffset() {\r\n    return this._pageYOffset;\r\n  }\r\n\r\n  /** Gets the intersection observer config */\r\n  get config() {\r\n    return this._config;\r\n  }\r\n\r\n  /** Gets an observable to the window scroll event */\r\n  get windowScrollY$() {\r\n    return this._windowScrollY$;\r\n  }\r\n\r\n  /** Gets an observable to the window resize event */\r\n  get windowResize$() {\r\n    return this._windowResize$;\r\n  }\r\n\r\n  /** Gets an observable to the window viewport event (combination of resize and scroll) */\r\n  get windowViewportChange$() {\r\n    return this._windowViewportChange$;\r\n  }\r\n\r\n  private manageScrollPos(): void {\r\n    this._pageYOffset = typeof window !== \"undefined\" ? window.pageYOffset : 0;\r\n  }\r\n\r\n  ngOnDestroy(): void {\r\n    this.scrollSub.unsubscribe();\r\n    this.resizeSub.unsubscribe();\r\n    this.viewportChangeSub.unsubscribe();\r\n  }\r\n}\r\n","import { Directive, ElementRef, EventEmitter, Input, OnDestroy, OnInit, Optional, Output, Renderer2 } from \"@angular/core\";\r\nimport { config, Subscription } from \"rxjs\";\r\nimport { IntersectionObserverConfig } from \"./intersection-observer-config.model\";\r\nimport { IntersectionObserverEvent } from \"./intersection-observer-event.model\";\r\nimport { IntersectionObserverService } from \"./intersection-observer.service\";\r\n\r\n@Directive({\r\n  selector: \"[intersectionObserver]\",\r\n\r\n})\r\nexport class IntersectionObserverDirective implements OnInit, OnDestroy {\r\n\r\n  // Private fields\r\n  private _viewportChangeSub: Subscription = new Subscription();\r\n  private _visitClass: string[] = [];\r\n  private _leaveClass: string[] = [];\r\n  private _removeVisitClass: string[] = [];\r\n  private _removeLeaveClass: string[] = [];\r\n  private _elementVisible: boolean = false;\r\n  private _hasClasses: boolean = false;\r\n\r\n  // Directive inputs\r\n  @Input() visitClass: string | undefined;         // Classes to apply when the element visits the viewport.\r\n  @Input() leaveClass: string | undefined;         // Classes to apply when the element visits the viewport.\r\n  @Input() removeVisitClass: string | undefined    // Classes to remove whe the element visits the viewport\r\n  @Input() removeLeaveClass: string | undefined    // Classes to remove when the element leaves the viewport.\r\n\r\n  @Input() useScroll: boolean | undefined          // true = Scroll Listener, false = IntersectionObserver\r\n  @Input() threshold: number | undefined;          // Threshold, how many precentage of the element must be out of the viewport to treat it as invisible.\r\n  @Input() autoRemove: boolean | undefined;        // true = Automatically remove classes from the element, false -> use removeLeaveClass\r\n\r\n  // Directive outputs\r\n  @Output() intersection: EventEmitter<IntersectionObserverEvent> =\r\n    new EventEmitter<IntersectionObserverEvent>(); // Event that fires once an element intersects.\r\n\r\n  constructor(\r\n    private element: ElementRef<any>,\r\n    private renderer: Renderer2,\r\n    private intersectionObserverService: IntersectionObserverService,\r\n    @Optional() private intersectionObserverConfig?: IntersectionObserverConfig) {\r\n  }\r\n\r\n  ngOnInit(): void {\r\n\r\n    // Generate arrays of class stings\r\n    this._visitClass = this.getClassArray(this.visitClass ?? \"\");\r\n    this._leaveClass = this.getClassArray(this.leaveClass ?? \"\");\r\n    this._removeVisitClass = this.getClassArray(this.removeVisitClass ?? \"\");\r\n    this._removeLeaveClass = this.getClassArray(this.removeLeaveClass ?? \"\");\r\n    this._hasClasses = (this.visitClass || this.leaveClass || this.removeVisitClass || this.removeLeaveClass) ? true : false;\r\n\r\n    // Identify which intersection mechanism should be used\r\n    // (IntersectionObserver or Scroll Listener) default IntersectionObserver\r\n    let useScroll = this.intersectionObserverConfig?.useScroll;\r\n    useScroll = useScroll == undefined ? false : useScroll;\r\n    useScroll = this.useScroll == undefined ? useScroll : this.useScroll;   \r\n\r\n    // Get threshold or default to 30\r\n    let threshold = this.intersectionObserverConfig?.threshold;\r\n    threshold = threshold == undefined ? 30 : threshold;\r\n    threshold = this.threshold == undefined ? threshold : this.threshold;   \r\n\r\n    // Auto remove\r\n    let autoRemove = this.intersectionObserverConfig?.autoRemove;\r\n    autoRemove = autoRemove == undefined ? true : autoRemove;\r\n    autoRemove = this.autoRemove == undefined ? autoRemove : this.autoRemove;\r\n\r\n    // using intersecting observer by default, else fallback to scroll Listener\r\n    if (\"IntersectionObserver\" in window && !useScroll) {\r\n      const options: IntersectionObserverInit = {\r\n        root: null, // Use window as root\r\n        threshold: threshold / 100,\r\n        rootMargin: \"0px\"\r\n      };\r\n      const observer: IntersectionObserver = new IntersectionObserver(\r\n        (entries, _) => {\r\n          entries.forEach((entry) => {\r\n            this.handleIntersection(entry.isIntersecting);\r\n          });\r\n        },\r\n        options\r\n      );\r\n      observer.observe(this.element.nativeElement);\r\n      return;\r\n    }\r\n\r\n    // Fallback to scroll listener\r\n    this._viewportChangeSub = this.intersectionObserverService.windowViewportChange$.subscribe(() =>\r\n      this.checkForIntersection()\r\n    );\r\n  }\r\n\r\n  /**\r\n   * Gets an array of classes.\r\n   * @param classString String with classes separated by whitespace.\r\n   * @returns An array with classes.\r\n   */\r\n  private getClassArray(classString: string): string[] {\r\n    let classes = new Array<string>();\r\n    classString.split(\" \").forEach(cls => {\r\n      if (cls.trim()) {\r\n        classes.push(cls.trim());\r\n      }\r\n    });\r\n\r\n    return classes;\r\n  }\r\n\r\n  /**\r\n   * Checks if the element is visible within the viewport.\r\n   * @returns void\r\n   * */\r\n  private checkForIntersection(): void {\r\n    const thresholdPx = (this.elementHeight / 100) * this.threshold!;\r\n    const scrollTriggerMax = this.offsetTop + thresholdPx - this.winHeight;\r\n    const scrollTriggerMin = (this.offsetTop + (this.elementHeight - thresholdPx));\r\n    this.handleIntersection(\r\n      this.intersectionObserverService.pageYOffset >= scrollTriggerMax &&\r\n      this.intersectionObserverService.pageYOffset <= scrollTriggerMin);\r\n  }\r\n\r\n  /**\r\n   * \r\n   * @param intersect Determines if the elements intersects with its viewport or not.\r\n   * @returns void\r\n   */\r\n  private handleIntersection(intersect: boolean): void {\r\n    this._elementVisible = intersect;\r\n    this.handleClasses();\r\n    this.intersection.emit({ element: this.element, intersect: intersect } as IntersectionObserverEvent);\r\n  }\r\n\r\n  /**\r\n   * Adds or removes classes on the element when it enters or leaves the viewport.\r\n   * @returns void\r\n   * */\r\n  private handleClasses(): void {\r\n    // No classes, skip\r\n    if (!this._hasClasses)\r\n      return;\r\n\r\n    if (this._elementVisible) {\r\n      this.addClasses(this._visitClass);\r\n      if (this.autoRemove) {\r\n        this.removeClasses(this._leaveClass);\r\n      }\r\n      this.removeClasses(this._removeVisitClass);\r\n    }\r\n    else {\r\n      this.addClasses(this._leaveClass);\r\n      if (this.autoRemove) {\r\n        this.removeClasses(this._visitClass);\r\n      }\r\n      this.removeClasses(this._removeLeaveClass)\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Helper to add a list of classes to the element.\r\n   * @param classes The list of classes to add.\r\n   * @returns void\r\n   */\r\n  private addClasses(classes: string[]): void {\r\n    classes.forEach(cls => {\r\n      if (!this.element.nativeElement.classList.contains(cls)) {\r\n        this.renderer.addClass(this.element.nativeElement, cls);\r\n      }\r\n    });\r\n  }\r\n\r\n  /**\r\n  * Helper to remove a list of classes from the element.\r\n  * @param classes The list of classes to remove.\r\n  * @returns void\r\n  */\r\n  private removeClasses(classes: string[]) {\r\n    classes.forEach(cls => {\r\n      if (this.element.nativeElement.classList.contains(cls)) {\r\n        this.renderer.removeClass(this.element.nativeElement, cls);\r\n      }\r\n    });\r\n  }\r\n\r\n  /**\r\n  * Gets the height of the browser window. \r\n  * @returns the height of the browser window.\r\n  */\r\n  private get winHeight() {\r\n    return typeof window !== \"undefined\" ? window.innerHeight : 0;\r\n  }\r\n\r\n  /**\r\n  * Gets the offset of the element. \r\n  * @returns The elements offset.\r\n  */\r\n  private get offsetTop() {\r\n    if (typeof this.element.nativeElement.getBoundingClientRect === \"function\") {\r\n      const viewportTop = this.element.nativeElement.getBoundingClientRect().top;\r\n      return viewportTop + this.intersectionObserverService.pageYOffset - this.element.nativeElement.clientTop;\r\n    }\r\n    else {\r\n      return 0;\r\n    }\r\n  }\r\n\r\n  /**\r\n  * Gets the height of the element (Including border)\r\n  * @returns the height of the element.\r\n  */\r\n  private get elementHeight() {\r\n    return this.element.nativeElement.offsetHeight as number;\r\n  }\r\n\r\n  ngOnDestroy(): void {\r\n    this._viewportChangeSub.unsubscribe();\r\n  }\r\n}\r\n","import { ModuleWithProviders, NgModule } from '@angular/core';\r\nimport { IntersectionObserverConfig } from './intersection-observer-config.model';\r\nimport { IntersectionObserverDirective } from './intersection-observer.directive';\r\nimport { IntersectionObserverService } from './intersection-observer.service';\r\n\r\n@NgModule({\r\n  declarations: [\r\n    IntersectionObserverDirective\r\n  ],\r\n  imports: [\r\n  ],\r\n  exports: [\r\n    IntersectionObserverDirective\r\n  ]\r\n})\r\nexport class IntersectionObserverModule {\r\n  static forRoot(config?: IntersectionObserverConfig): ModuleWithProviders<IntersectionObserverModule> {\r\n    return {\r\n      ngModule: IntersectionObserverModule,\r\n      providers: [\r\n        { provide: IntersectionObserverConfig, useValue: config ? config : { debounce: 10, threshold: 30 } as IntersectionObserverConfig, multi: false },\r\n        IntersectionObserverService\r\n      ]\r\n    };\r\n  }\r\n}\r\n","/*\n * Public API Surface of intersection-observer\n */\n\nexport * from './lib/intersection-observer.directive';\nexport * from './lib/intersection-observer.service';\nexport * from './lib/intersection-observer.module';\n","/**\n * Generated bundle index. Do not edit.\n */\n\nexport * from 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