Send FormData object AND an additional parameter via ajax

Question

I have managed to send a FormData object like so:

var formData = new FormData();
formData.append('file', this.files[0]);
$.ajax({
   url: urlUploadProductsFile,
   type: 'POST',
   data: formData,
   cache: false,
   contentType: false,
   processData: false
}, 'json');

Now what I want to do is add an additional CustomerId to send to the server. The following won't work:

var formData = new FormData();
formData.append('file', this.files[0]);
$.ajax({
   url: urlUploadProductsFile,
   type: 'POST',
   data: { "file": formData, "CustomerId": 2 },
   cache: false,
   contentType: false,
   processData: false
}, 'json');

And I also tried the following variations:

data: { "file": formData, "CustomerId": 2 }, processData: true

data: JSON.stringify({ "file": formData, "CustomerId": 2 })

data: { "file": JSON.stringify(formData), "CustomerId": 2 }

data: { file: formData, CustomerId: 2 }

Any help appreciated.

Aditya Tomar · Accepted Answer · 2019-08-13 09:48:36Z

40

Try:

var formData = new FormData();
formData.append('file', this.files[0]);
formData.append('CustomerId', 2);

/*
 note:: appending in form Data will give "csrf token mismatch error". 
 so better you make a input feild of type hidden with name = CustomerId 
 and value =  2 
*/ 

$.ajax({
   url: urlUploadProductsFile,
   type: 'POST',
   data: formData,
   cache: false,
   contentType: false,
   processData: false
}, 'json');

edited Aug 13, 2019 at 9:48

Aditya Tomar

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answered Apr 6, 2016 at 10:48

Borik Bobrujskov

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3 Comments

Joe Over a year ago

what if the secondary data was not a simple type like 2? What if I also needed to send a json object? How would I encode it in the front end, and how would I unencode it in the controller?

Borik Bobrujskov Over a year ago

JSON is a simple string. You can escape it as pointed there: freeformatter.com/json-escape.html > The following characters are reserved in JSON and must be properly escaped to be used in strings: Backspace is replaced with \b Form feed is replaced with \f Newline is replaced with \n Carriage return is replaced with \r Tab is replaced with \t Double quote is replaced with \" Backslash is replaced with \\

NetOperator Wibby Over a year ago

For anyone coming here in the future, the extra parameters I added were put in the params object of req (request).

Jiri Tousek · Accepted Answer · 2016-04-06 10:46:24Z

2

You need to either add it directly to formData (just as you did with 'file'), or alternatively use query (GET) parameters.

answered Apr 6, 2016 at 10:46

Jiri Tousek

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