@stelmukhov/ngx-text-diff

ngx-text-diff

• A simple text diff component to be used with Angular and based on google diff match patch library.

Dependencies

• diff-match-patch : ^1.0.5

Required Packages

These packages will not be auto-installed and must be installed in addition to this library.

• @angular/common >= 12
• @angular/core >= 12
• @angular/forms >= 12
• @angular/cdk >= 12 (used for scrolling synchronization)

Demo

Ngx Text Diff Demo

Installation

npm i ngx-text-diff

API

module: NgxTextDiffModule component: NgxTextDiffComponent selector: td-ngx-text-diff

Inputs

Input	Type	Required	Description
left	string	Yes	First text to be compared
right	string	Yes	Second text to be compared
diffContent	Observable	Optional	DiffContent observable
format	DiffTableFormat	Optional, default: SideBySide	Possible values: -SideBySide -LineByLine
loading	boolean	Optional, default: false	Possible values: -true: shows an loading spinner. - false: hides the loading spinner
hideMatchingLines	boolean	Optional, default: false	Possible values: -true: Only shows lines with differences. - false: shows all lines
showToolbar	boolean	Optional, default: true	Possible values: -true: shows the toolbar. - false: hides the format toolbar
showBtnToolbar	boolean	Optional, default: true	Possible values: -true: shows the format toolbar. - false: hides the format toolbar
outerContainerClass	any	Optional	ngClass object for the outer div
outerContainerStyle	any	Optional	ngStyle object for the outer style
toolbarClass	any	Optional	ngClass object for the toolbar div
toolbarStyle	any	Optional	ngStyle object for the toolbar style
compareRowsClass	any	Optional	ngClass object for the div surrounding the table rows
compareRowsStyle	any	Optional	ngStyle object for the div surrounding the table rows
synchronizeScrolling	boolean	Optional, default: true	Possible values: -true: Scrolls both tables together. - false: Scrolls individually

Output

Input	Type	Required	Description
compareResults	DiffResults	Optional	Event fired when comparison is executed

Custom Objects

export interface DiffContent {
  leftContent: string;
  rightContent: string;
}

export type DiffTableFormat = 'SideBySide' | 'LineByLine';

export interface DiffResults {
  hasDiff: boolean;
  diffsCount: number;
  rowsWithDiff: {
    leftLineNumber?: number;
    rightLineNumber?: number;
    numDiffs: number;
  }[];
}

Usage

1. Register the NgxTextDiffModule in a module, for example app module.

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { ScrollDispatchModule } from '@angular/cdk/scrolling';

import { AppComponent } from './app.component';
import { NgxTextDiffModule } from 'ngx-text-diff';

@NgModule({
  declarations: [AppComponent],
  imports: [BrowserModule, ScrollDispatchModule, NgxTextDiffModule],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule {}

import { Component, OnInit } from '@angular/core';
import { DiffContent, DiffResults } from 'ngx-text-diff/lib/ngx-text-diff.model';

@Component({
  selector: 'app-home',
  templateUrl: './home.component.html',
  styleUrls: []
})
export class HomeComponent implements OnInit {
  left = `some text to\nbe compared!`
  right = `A changed\n version \n of the text to\nbe compared!`

  constructor() {}

  ngOnInit() {
  }

  onCompareResults(diffResults: DiffResults) {
    console.log('diffResults', diffResults);
  }
}

<td-ngx-text-diff
  [left]="left"
  [right]="right"
  (compareResults)="onCompareResults($event)"
>

Build the NgxTextDiff module

Run ng build ngx-text-diff to build the library. The build artifacts will be stored in the dist/ngx-text-diff directory.

Credits

This project is based on google diff match patch.