Aspose.PDF for JavaScript via C++: AsposePdfRecover

Author: OleksandrAndriienko

english/javascript-cpp/_index.md

@@ -101,6 +101,7 @@ Such operations are very time consuming, so we recommend using Web Worker.
 | [AsposePdfDeleteTextHeaders](./organize/asposepdfdeletetextheaders/) | Delete text headers from a PDF-file. |
 | [AsposePdfDeleteTextFooters](./organize/asposepdfdeletetextfooters/) | Delete text footers from a PDF-file. |
 | [AsposePdfReplaceTextEx](./organize/asposepdfreplacetextex/) | Replace multiple text fragments in a PDF-file with alignment control. |
+| [AsposePdfRecover](./organize/asposepdfrecover/) | Recover a PDF-file structure and trims invalid data. |
 
 
 ## Metadata PDF functions

english/javascript-cpp/organize/_index.md

@@ -53,6 +53,7 @@ url: /javascript-cpp/organize/
 | [AsposePdfDeleteTextHeaders](./asposepdfdeletetextheaders/) | Delete text headers from a PDF-file. |
 | [AsposePdfDeleteTextFooters](./asposepdfdeletetextfooters/) | Delete text footers from a PDF-file. |
 | [AsposePdfReplaceTextEx](./asposepdfreplacetextex/) | Replace multiple text fragments in a PDF-file with alignment control. |
+| [AsposePdfRecover](./asposepdfrecover/) | Recover a PDF-file structure and trims invalid data. |
 
 
 ## Detailed Description

english/javascript-cpp/organize/asposepdfrecover/_index.md

@@ -0,0 +1,77 @@
+---
+title: "AsposePdfRecover"
+second_title: Aspose.PDF for JavaScript via C++
+description:  "Recover a PDF-file structure and trims invalid data."
+type: docs
+url: /javascript-cpp/organize/asposepdfrecover/
+---
+
+_Recover a PDF-file structure and trims invalid data._
+
+```js
+function AsposePdfRecover(
+    fileBlob,
+    fileName,
+    fileNameResult
+)
+```
+
+**Parameters**: 
+
+* **fileBlob** Blob object 
+* **fileName** file name 
+* **fileNameResult** result file name 
+
+**Return**: 
+JSON object 
+  * **errorCode** - code error (0 no error)
+  * **errorText** - text error ("" no error)
+  * **fileNameResult** - result file name
+
+
+**Web Worker example**:
+```js
+  /*Create Web Worker*/
+  const AsposePDFWebWorker = new Worker("AsposePDFforJS.js");
+  AsposePDFWebWorker.onerror = evt => console.log(`Error from Web Worker: ${evt.message}`);
+  AsposePDFWebWorker.onmessage = evt => document.getElementById('output').textContent = 
+    (evt.data == 'ready') ? 'loaded!' :
+      (evt.data.json.errorCode == 0) ? `Result:\n${DownloadFile(evt.data.json.fileNameResult, "application/pdf", evt.data.params[0])}` : `Error: ${evt.data.json.errorText}`;
+
+  /*Event handler*/
+  const ffileRecover = e => {
+    const file_reader = new FileReader();
+    file_reader.onload = event => {
+      /*Recover a PDF-file structure and trims invalid data and save the "ResultRecover.pdf" - Ask Web Worker*/
+      AsposePDFWebWorker.postMessage({ "operation": 'AsposePdfRecover', "params": [event.target.result, e.target.files[0].name, "ResultRecover.pdf"] }, [event.target.result]);
+    };
+    file_reader.readAsArrayBuffer(e.target.files[0]);
+  };
+
+  /*Make a link to download the result file*/
+  const DownloadFile = (filename, mime, content) => {
+      mime = mime || "application/octet-stream";
+      var link = document.createElement("a"); 
+      link.href = URL.createObjectURL(new Blob([content], {type: mime}));
+      link.download = filename;
+      link.innerHTML = "Click here to download the file " + filename;
+      document.body.appendChild(link); 
+      document.body.appendChild(document.createElement("br"));
+      return filename;
+    }
+```
+**Simple example**:
+```js
+  var ffileRecover = function (e) {
+    const file_reader = new FileReader();
+    file_reader.onload = (event) => {
+      /*Recover a PDF-file structure and trims invalid data and save the "ResultRecover.pdf"*/
+      const json = AsposePdfRecover(event.target.result, e.target.files[0].name, "ResultRecover.pdf");
+      if (json.errorCode == 0) document.getElementById('output').textContent = json.fileNameResult
+      else document.getElementById('output').textContent = json.errorText;
+      /*Make a link to download the result file*/
+      DownloadFile(json.fileNameResult, "application/pdf");
+    };
+    file_reader.readAsArrayBuffer(e.target.files[0]);
+  };
+```