ngx-line-truncation
Version:
Ngx Line Truncation is line truncation implementation for Angular that truncate text by user defined line number.
171 lines • 20.6 kB
JavaScript
import { Directive, ElementRef, EventEmitter, Input, Output, Renderer2, HostListener } from "@angular/core";
import { getContentHeight, getLineHeight, truncate } from "line-truncation";
import { Subject, BehaviorSubject } from "rxjs";
import { debounceTime, skip } from "rxjs/operators";
import * as i0 from "@angular/core";
export class LineTruncationDirective {
constructor(elementRef, renderer) {
this.elementRef = elementRef;
this.renderer = renderer;
this.lines = 1;
this.options = { ellipsis: "\u2026" };
this.watchChanges = false;
this.hasTruncated = new EventEmitter();
this.MAX_TRIES = 10;
this.observerFlag = true;
this._disabled$ = new BehaviorSubject(false);
this.element = this.elementRef.nativeElement;
this.windowResize$ = new Subject();
}
set disabled(val) {
this._disabled$.next(val);
}
handleClick(event) {
this.windowResize$.next(event);
}
/**
* Hide the original text content until we've finished the truncation
*/
ngOnInit() {
this._disabled$.pipe(skip(1)).subscribe(disable => {
// If there is elementClone, then recover
if (!!this.elementClone) {
this.putbackElement();
}
if (disable) {
// shut down listener, observer
this.disconnectMutationObserver();
this.disconnectWindowLisener();
}
else {
// re-register
this.truncationInit();
// re-execute truncation
this.truncateWhenNecessary(this.element);
}
});
// first emit handling
if (!this._disabled$.getValue()) {
this.truncationInit();
}
}
ngAfterViewInit() {
this.truncateWhenNecessary(this.element);
}
truncateWhenNecessary(element, tries = 1, maxTries = this.MAX_TRIES) {
if (this._disabled$.getValue()) {
return;
}
// backup original element before truncation
this.elementClone = element.cloneNode(true);
if (tries > maxTries) {
return;
}
// Allows buffer period for DOM to be ready
setTimeout(() => {
// Recursively call the truncate itself if Client Height is not ready
if (element.clientHeight > 0) {
const contentHeight = getContentHeight(element);
const lineHeight = getLineHeight(element);
const targetHeight = this.lines * lineHeight;
if (contentHeight > targetHeight) {
try {
truncate(element, this.lines, this.options.ellipsis, this.handler.bind(this));
}
catch (e) {
this.handler(true);
}
}
else {
// when there is no need, simply show the element, emit false and unsubscribe from MutationObserver if `watchChanges` prop was falsy
this.handler(false);
}
}
}, 100);
}
handler(e) {
this.isTruncated = e;
this.hasTruncated.emit(this.isTruncated);
if (!this.watchChanges) {
this.observerFlag = false;
this.disconnectMutationObserver();
}
this.renderer.removeStyle(this.element, "visibility");
}
truncationInit() {
this.renderer.setStyle(this.element, "visibility", "hidden");
this.initWindowResizeListener(this.element);
this.initMutationObserver(this.element);
}
putbackElement() {
// grab old child nodes
const childNodes = Array.from(this.elementClone.childNodes);
// clean element
while (this.element.firstChild) {
this.element.removeChild(this.element.firstChild);
}
// push child node to element shell
childNodes.forEach(node => {
this.element.appendChild(node);
});
this.elementClone = null;
}
initWindowResizeListener(element) {
this.windowListener = this.windowResize$
.pipe(debounceTime(500))
.subscribe(() => {
this.renderer.setStyle(element, "visibility", "hidden");
this.putbackElement();
this.truncateWhenNecessary(element);
});
}
initMutationObserver(element) {
this.mutationObserver = new MutationObserver(() => {
if (this.observerFlag) {
this.truncateWhenNecessary(element);
}
});
this.mutationObserver.observe(element, {
childList: true
});
}
disconnectMutationObserver() {
if (this.mutationObserver) {
this.mutationObserver.disconnect();
}
}
disconnectWindowLisener() {
if (this.windowListener) {
this.windowListener.unsubscribe();
}
}
ngOnDestroy() {
this._disabled$.complete();
this.disconnectMutationObserver();
this.disconnectWindowLisener();
}
}
LineTruncationDirective.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.0", ngImport: i0, type: LineTruncationDirective, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }], target: i0.ɵɵFactoryTarget.Directive });
LineTruncationDirective.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "14.0.0", type: LineTruncationDirective, selector: "[line-truncation]", inputs: { lines: ["line-truncation", "lines"], options: "options", disabled: "disabled", watchChanges: "watchChanges" }, outputs: { hasTruncated: "hasTruncated" }, host: { listeners: { "window:resize": "handleClick($event)" } }, exportAs: ["lineTruncation"], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.0", ngImport: i0, type: LineTruncationDirective, decorators: [{
type: Directive,
args: [{
selector: "[line-truncation]",
exportAs: "lineTruncation"
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.Renderer2 }]; }, propDecorators: { lines: [{
type: Input,
args: ["line-truncation"]
}], options: [{
type: Input
}], disabled: [{
type: Input
}], watchChanges: [{
type: Input
}], hasTruncated: [{
type: Output
}], handleClick: [{
type: HostListener,
args: ["window:resize", ["$event"]]
}] } });
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{\n  AfterViewInit,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  Input,\n  OnInit,\n  Output,\n  Renderer2,\n  OnDestroy,\n  HostListener\n} from \"@angular/core\";\nimport { getContentHeight, getLineHeight, truncate } from \"line-truncation\";\nimport { Subject, Subscription, BehaviorSubject } from \"rxjs\";\nimport { debounceTime, skip } from \"rxjs/operators\";\n\n/**\n * This Directive allows you to specify the number of lines that you want to truncate a text by.\n *\n * @example\n * <!-- with <p> -->\n *   <p [innerHTML]=\"description\"\n *      [line-truncation]=\"5\"\n *      (hasTruncated)=\"onTruncationFinish(e)\">\n *   </p>\n * <!-- with div -->\n *  <div [line-truncation]=\"5\">your text</div>\n *\n */\n\ninterface Options {\n  ellipsis: string;\n}\n\n@Directive({\n  selector: \"[line-truncation]\",\n  exportAs: \"lineTruncation\"\n})\nexport class LineTruncationDirective\n  implements AfterViewInit, OnInit, OnDestroy {\n  @Input(\"line-truncation\")\n  lines = 1;\n\n  @Input()\n  options: Options = { ellipsis: \"\\u2026\" };\n\n  @Input() set disabled(val: boolean) {\n    this._disabled$.next(val);\n  }\n\n  @Input()\n  watchChanges = false;\n\n  @Output()\n  hasTruncated = new EventEmitter<boolean>();\n\n  elementClone: Node;\n  MAX_TRIES = 10;\n  observerFlag = true;\n\n  _disabled$ = new BehaviorSubject<boolean>(false);\n  element = this.elementRef.nativeElement;\n  windowResize$ = new Subject<Event>();\n  windowListener: Subscription;\n  mutationObserver: MutationObserver;\n  isTruncated: boolean;\n\n  @HostListener(\"window:resize\", [\"$event\"])\n  handleClick(event: Event) {\n    this.windowResize$.next(event);\n  }\n\n  constructor(private elementRef: ElementRef<HTMLElement>, private renderer: Renderer2) {}\n  /**\n   * Hide the original text content until we've finished the truncation\n   */\n  ngOnInit() {\n    this._disabled$.pipe(skip(1)).subscribe(disable => {\n      // If there is elementClone, then recover\n      if (!!this.elementClone) {\n        this.putbackElement();\n      }\n\n      if (disable) {\n        // shut down listener, observer\n        this.disconnectMutationObserver();\n        this.disconnectWindowLisener();\n      } else {\n        // re-register\n        this.truncationInit();\n        // re-execute truncation\n        this.truncateWhenNecessary(this.element);\n      }\n    });\n    // first emit handling\n    if (!this._disabled$.getValue()) {\n      this.truncationInit();\n    }\n  }\n\n  ngAfterViewInit() {\n    this.truncateWhenNecessary(this.element);\n  }\n\n  truncateWhenNecessary(\n    element: HTMLElement,\n    tries: number = 1,\n    maxTries = this.MAX_TRIES\n  ) {\n    if (this._disabled$.getValue()) {\n      return;\n    }\n    // backup original element before truncation\n    this.elementClone = element.cloneNode(true);\n\n    if (tries > maxTries) {\n      return;\n    }\n\n    // Allows buffer period for DOM to be ready\n    setTimeout(() => {\n      // Recursively call the truncate itself if Client Height is not ready\n      if (element.clientHeight > 0) {\n        const contentHeight = getContentHeight(element);\n        const lineHeight = getLineHeight(element);\n        const targetHeight = this.lines * lineHeight;\n\n        if (contentHeight > targetHeight) {\n          try {\n            truncate(\n              element,\n              this.lines,\n              this.options.ellipsis,\n              this.handler.bind(this)\n            );\n          } catch (e) {\n            this.handler(true);\n          }\n        } else {\n          // when there is no need, simply show the element, emit false and unsubscribe from MutationObserver if `watchChanges` prop was falsy\n          this.handler(false);\n        }\n      }\n    }, 100);\n  }\n\n  handler(e: boolean) {\n    this.isTruncated = e;\n    this.hasTruncated.emit(this.isTruncated);\n\n    if (!this.watchChanges) {\n      this.observerFlag = false;\n      this.disconnectMutationObserver();\n    }\n    this.renderer.removeStyle(this.element, \"visibility\");\n  }\n\n  truncationInit() {\n    this.renderer.setStyle(this.element, \"visibility\", \"hidden\");\n    this.initWindowResizeListener(this.element);\n    this.initMutationObserver(this.element);\n  }\n\n  putbackElement() {\n    // grab old child nodes\n    const childNodes: Node[] = Array.from(this.elementClone.childNodes);\n    // clean element\n    while (this.element.firstChild) {\n      this.element.removeChild(this.element.firstChild);\n    }\n\n    // push child node to element shell\n    childNodes.forEach(node => {\n      this.element.appendChild(node);\n    });\n\n    this.elementClone = null;\n  }\n\n  initWindowResizeListener(element: HTMLElement) {\n    this.windowListener = this.windowResize$\n      .pipe(debounceTime(500))\n      .subscribe(() => {\n        this.renderer.setStyle(element, \"visibility\", \"hidden\");\n        this.putbackElement();\n        this.truncateWhenNecessary(element);\n      });\n  }\n\n  initMutationObserver(element: HTMLElement) {\n    this.mutationObserver = new MutationObserver(() => {\n      if (this.observerFlag) {\n        this.truncateWhenNecessary(element);\n      }\n    });\n\n    this.mutationObserver.observe(element, {\n      childList: true\n    });\n  }\n\n  disconnectMutationObserver() {\n    if (this.mutationObserver) {\n      this.mutationObserver.disconnect();\n    }\n  }\n\n  disconnectWindowLisener() {\n    if (this.windowListener) {\n      this.windowListener.unsubscribe();\n    }\n  }\n\n  ngOnDestroy() {\n    this._disabled$.complete();\n    this.disconnectMutationObserver();\n    this.disconnectWindowLisener();\n  }\n}\n"]}