ng-scroll-spy/fesm2015/ng-scroll-spy.mjs.map

Angular directive that tracking the scrolling of the document and highlight the navigation link

{"version":3,"file":"ng-scroll-spy.mjs","sources":["../../src/directives/ng-scroll-spy.directive.ts","../../src/ng-scroll-spy.module.ts","../../src/ng-scroll-spy.ts"],"sourcesContent":["import {AfterContentInit, Directive, ElementRef, HostListener, Inject, Renderer2} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\n\nimport {extractElementPosition} from 'ng-html-util';\n\n@Directive({\n  selector: '[scroll-spy]'\n})\nexport class ScrollSpyDirective implements AfterContentInit {\n\n  private elements = [];\n  private currentActiveLink;\n  private directNavigation = false;\n\n  constructor(@Inject(DOCUMENT) private document: Document,\n              private el: ElementRef,\n              private renderer: Renderer2) {\n  }\n\n  public ngAfterContentInit(): void {\n    this.collectIds();\n  }\n\n  private collectIds(): void {\n    this.elements = [];\n    let elements = this.el.nativeElement.querySelectorAll('a');\n\n    for (let i = 0; i < elements.length; i++) {\n      let elem = elements.item(i);\n\n      let id = ScrollSpyDirective.getId(elem);\n      if (!id)\n        continue;\n\n      let destination = this._getPeerElement(id);\n\n      if (!destination)\n        continue;\n\n      elem.addEventListener('click', this._onLinkClicked.bind(this));\n\n      this.elements.push({\n        id,\n        link: elem,\n        destination\n      })\n    }\n  }\n\n  private _onLinkClicked(event: Event):  void {\n    event.preventDefault();\n\n    let target = event.currentTarget;\n    let id = ScrollSpyDirective.getId(target);\n    let destination = this._getPeerElement(id);\n    this.directNavigation = true;\n\n    let position = extractElementPosition(this.document, destination);\n\n    window.scrollTo({top: position.top - 25, left: 0, behavior: 'smooth'});\n\n    this._cleanCurrentLink();\n    this._setCurrentLink(target);\n    this.directNavigation = false;\n  }\n\n  private _getPeerElement(id): HTMLElement | null {\n\n    let destination = this.document.getElementById(id);\n\n    if (!destination)\n      return null;\n\n    return destination;\n  }\n\n  private static getId(elem): string {\n    let href = elem.getAttribute('href');\n\n    if (!href)\n      return null;\n\n    return href.replace('#', '');\n  }\n\n  @HostListener(\"window:scroll\", ['$event'])\n  onWindowScroll(event: Event): void {\n    if (this.directNavigation)\n      return;\n\n    for (let elem of this.elements) {\n      let top = elem.destination.getBoundingClientRect().top;\n      if (top > 0 && top < 25) {\n        this._cleanCurrentLink();\n        this._setCurrentLink(elem.link);\n        break;\n      }\n    }\n  }\n\n  private _cleanCurrentLink(): void {\n    if (!this.currentActiveLink)\n      return;\n\n    this.renderer.removeClass(this.currentActiveLink, 'active');\n  }\n\n  private _setCurrentLink(elem): void {\n    this.currentActiveLink = elem;\n    this.renderer.addClass(this.currentActiveLink, 'active');\n  }\n}\n","import {NgModule} from '@angular/core';\nimport {polyfill as smoothscroll} from 'smoothscroll-polyfill';\n\nimport {ScrollSpyDirective} from './directives/ng-scroll-spy.directive';\n\nexport * from './directives/ng-scroll-spy.directive';\n\n@NgModule({\n  declarations: [ScrollSpyDirective],\n  exports: [ScrollSpyDirective]\n})\nexport class ScrollSpyModule {\n  constructor(){\n    smoothscroll();\n  }\n}\n","/**\n * Generated bundle index. 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