Facing Issue while download the file.

Summary:

I'm able to download the file but when i tried to open the file it shows failed to load PDF Document.

Content (required):

Code Snippet (add any code snippets that support your topic, if applicable):

JAVASCRIPT CODE

class PageModule {

constructor() {}

  preview(blobData, contentTypeParam) {

      let contentType = contentTypeParam;

      if (contentType === undefined || contentType.length === 0) {

        contentType = "multipart/form-data";

      }

      let newBlob = new Blob([blobData], {

        type: contentType,

      });

      return URL.createObjectURL(newBlob);

    }

 download(blobData, contentType, fileName) {

      let element = document.createElement("a");

      element.setAttribute("href", this.preview(blobData, contentType));

      element.setAttribute("download", fileName);

      element.style.display = "none";

      document.body.appendChild(element);

      element.click();

      document.body.removeChild(element);