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Simulate form file uploads when you have the file content as a string

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MultiParty

MultiParty is a small Javascript library which helps you to create a multipart/form-data XML-HTTP-Request when you have the content of a file available, simulating a form upload containing a file.

Walkthrough

Create a new MultiParty instance

var mp = new MultiParty();

Add text field entries, using their name and the value to send

mp.addParam("email", "[email protected]");
mp.addParam("name", "foo");

Add a file using the field name, a filename, a content type and the file content as a string

mp.addFile("profile_banner", "dscn_1234.jpg", "image/jpeg", "HfKaDSsfj6dHGTRj&stzIuT456/Iufz4Ek&/RDvb76QW&fsdj/fgDGTh0j/g&df32ED7mbnF");

You can now get the XHR payload and its content type header (you need to use this header since it depends on the data you send)

var body = mp.getBody(); // can be sent as XHR payload
var cT = mp.getContentTypeHeader(); // set this as the XHRs content type

Sending the XML-HTTP-Request is straight-forward

var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function() {
  if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
    alert(xmlhttp.responseText);
  }
}
xmlhttp.open("POST", "myEndPoint.php", true);
xmlhttp.setRequestHeader("Content-type", cT);
xmlhttp.send(body);

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Simulate form file uploads when you have the file content as a string

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