compare Method

Summary

Compares a list of LEADDocument objects.

Syntax
TypeScript
JavaScript
compare = function( 
   documentIds, 
   options, 
   userData 
) 
static compare( 
   documentIds: string[], 
   options: DocumentCompareOptions, 
   _userData?_: any 
): JQueryPromise<DocumentDifference>; 

Parameters

documentIds

The IDs of the LEADDocuments to compare.

options

The DocumentCompareOptions that will be used.

userData

User-defined data to pass to the service.

Return Value

A Promise object that can resolve successfully to a Compare.DocumentDifference object, or fail if an error occurs.

Remarks

The IDs of exactly two LEADDocument objects must be provided to this method. The documents must be saved into the cache.

Example
Compare.ts
DocumentHelper.ts
Compare.js
DocumentHelper.js
Compare.html
import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class LEADDocument_CompareExample { 
   public constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/v200/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   public run = (buttonID: string) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.compareDocument; 
   } 
 
   compareDocument = () => { 
 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const url2 = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((document1: lt.Document.LEADDocument) => { 
            lt.Document.DocumentFactory.loadFromUri(url2, loadDocumentOptions) 
               .done((document2: lt.Document.LEADDocument) => { 
                  const options = new lt.Document.Compare.DocumentCompareOptions(); 
                  lt.Document.LEADDocument.compare([document1.documentId, document2.documentId], options) 
                     .done((diff) => { 
                        DocumentHelper.log("Total number of differences: " + diff.differences.length); 
                        DocumentHelper.log("Total number of insertions: " + diff.getInsertions().length); 
                        DocumentHelper.log("Total number of deletions: " + diff.getDeletions().length); 
                        diff.differences.forEach((textDiff) => { 
                           DocumentHelper.log("   Operation: " + textDiff.operation); 
                           DocumentHelper.log("   Text: " + textDiff.text); 
                           textDiff.characters.forEach((char) => { 
                              DocumentHelper.log("       Character: " + char.character); 
                              DocumentHelper.log("       Character Index: " + char.characterIndex); 
                              DocumentHelper.log("       Page Number: " + char.pageNumber); 
                              DocumentHelper.log("       Wordmap Index: " + char.wordmapIndex); 
                           }); 
                        }); 
                     }) 
                     .fail(DocumentHelper.showServiceError); 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
} 
export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message: string, data?: any) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
} 
import { DocumentHelper } from "../../utilities/DocumentHelper"; 
 
export class LEADDocument_CompareExample { 
   constructor() { 
      lt.RasterSupport.setLicenseUri("https://demo.leadtools.com/licenses/v200/LEADTOOLSEVAL.txt", "EVAL", null); 
      DocumentHelper.initFactory(); 
   } 
 
   run = (buttonID) => { 
      const exampleButton = document.getElementById(buttonID); 
      exampleButton.onclick = this.compareDocument; 
   } 
 
   compareDocument = () => { 
 
      const url = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const url2 = "https://demo.leadtools.com/images/pdf/leadtools.pdf"; 
      const loadDocumentOptions = new lt.Document.LoadDocumentOptions(); 
 
      lt.Document.DocumentFactory.loadFromUri(url, loadDocumentOptions) 
         .done((document1) => { 
            lt.Document.DocumentFactory.loadFromUri(url2, loadDocumentOptions) 
               .done((document2) => { 
                  const options = new lt.Document.Compare.DocumentCompareOptions(); 
                  lt.Document.LEADDocument.compare([document1.documentId, document2.documentId], options) 
                     .done((diff) => { 
                        DocumentHelper.log("Total number of differences: " + diff.differences.length); 
                        DocumentHelper.log("Total number of insertions: " + diff.getInsertions().length); 
                        DocumentHelper.log("Total number of deletions: " + diff.getDeletions().length); 
                        diff.differences.forEach((textDiff) => { 
                           DocumentHelper.log("   Operation: " + textDiff.operation); 
                           DocumentHelper.log("   Text: " + textDiff.text); 
                           textDiff.characters.forEach((char) => { 
                              DocumentHelper.log("       Character: " + char.character); 
                              DocumentHelper.log("       Character Index: " + char.characterIndex); 
                              DocumentHelper.log("       Page Number: " + char.pageNumber); 
                              DocumentHelper.log("       Wordmap Index: " + char.wordmapIndex); 
                           }); 
                        }); 
                     }) 
                     .fail(DocumentHelper.showServiceError); 
               }) 
               .fail(DocumentHelper.showServiceError); 
         }) 
         .fail(DocumentHelper.showServiceError); 
   } 
} 
export class DocumentHelper { 
   static showServiceError = (jqXHR, statusText, errorThrown) => { 
      alert("Error returned from service. See the console for details."); 
      const serviceError = lt.Document.ServiceError.parseError(jqXHR, statusText, errorThrown); 
      console.error(serviceError); 
   } 
 
   static log = (message, data) => { 
      const outputElement = document.getElementById("output"); 
      if (outputElement) { 
         const time = (new Date()).toLocaleTimeString(); 
         const textElement = document.createElement("p"); 
         textElement.innerHTML = (outputElement.childElementCount + 1) + " [" + time + "]: " + message; 
         outputElement.insertBefore(textElement, outputElement.firstChild); 
      } 
 
      if (!data) 
         console.log(message); 
      else 
         console.log(message, data); 
   } 
 
   static initFactory = () => { 
      // To communicate with the DocumentsService, it must be running! 
      // Change these parameters to match the path to the service. 
      lt.Document.DocumentFactory.serviceHost = "http://localhost:40000"; 
      lt.Document.DocumentFactory.servicePath = ""; 
      lt.Document.DocumentFactory.serviceApiPath = "api"; 
   } 
} 
<!doctype html> 
<html lang="en"> 
<title>Document Example | Compare</title> 
 
<head> 
   <script src="https://code.jquery.com/jquery-2.2.4.min.js" 
      integrity="sha256-BbhdlvQf/xTY9gja0Dq3HiwQF8LaCRTXxZKRutelT44=" crossorigin="anonymous"></script> 
 
   <script src="../../LT/Leadtools.js"></script> 
   <script src="../../LT/Leadtools.Controls.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Engine.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Designers.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Rendering.Javascript.js"></script> 
   <script src="../../LT/Leadtools.Annotations.Automation.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Main.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Color.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Core.js"></script> 
   <script src="../../LT/Leadtools.ImageProcessing.Effects.js"></script> 
   <script src="../../LT/Leadtools.Document.js"></script> 
   <script src="../../LT/Leadtools.Document.Viewer.js"></script> 
   <link rel="stylesheet" type="text/css" href="../../css/examples.css"> 
 
   <!-- All demo files are bundled and appended to the window --> 
   <script src="../../bundle.js" type="text/javascript"></script> 
</head> 
 
<body> 
   <div> 
      <button type="button" id="exampleButton">Run Example</button> 
   </div> 
   <div id="output"></div> 
   <div> 
      <img id="img" /> 
   </div> 
</body> 
 
<script> 
   window.onload = () => { 
      const example = new window.examples.LEADDocument.Compare(); 
      example.run("exampleButton"); 
   }; 
</script> 
</html> 
Requirements

Target Platforms

Help Version 20.0.2019.12.10
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