With Javascript, create a new file and send it to a CouchDB database as an attachment to a document

create-a-file-and-upload-as-attachment-to-couchdb.js

// With Javascript, create a new file and send it to a CouchDB database as an attachment of a Document

// Code inspired by "NEW TRICKS IN XMLHTTPREQUEST2" by Eric Bidelman
// http://www.html5rocks.com/en/tutorials/file/xhr2/

/*
 *  There are two ways of accomplishing this. The first way will always result in a filename of "blob", which is
 *  bummer.  The second way you will be able to name the file what you want.  Note that these examples
 *  assume you have the ID of the database, the ID of the Document, and the most recent revision hash of that Document.
 */

/* 
 * 1. This version will create the file with file name of "blob"
 */

var formData = new FormData()
formData.append("_attachments", new Blob(['hello world'], {type: 'text/plain'}))
formData.append("_rev", "4-946c660922a86d4bcc19c12272553e42")
 
var xhr = new XMLHttpRequest()
xhr.open('POST', "/fupload/112", true)
xhr.onload = function(response) { 
  if(response.status == 200) {
  	alert("Your file has been uploaded.")
  }
}
xhr.send(formData)


/*
 * 2. This version will create the file with file name of "hello-world.txt"
 */

var xhr = new XMLHttpRequest()
// Notice we're using PUT, not POST.  Also, what we want to name the file is in the URI.
xhr.open('PUT', "/fupload/112/hello-world.txt?rev=15-05bbd9cf2a3c17fff5000d4c1e716099", true)
xhr.onload = function(response) { 
  if(response.status == 200) {
  	alert("Your file has been uploaded.")
  }
}
xhr.send(new Blob(['hello world'], {type: 'text/plain'}))