javascript - how to append array in formData ,array in which includes 2 values with keys - Stack Overflow

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Code :

let options = new RequestOptions({ headers: headers });
let array1;

array1 = [{ "subfolder_name": subfolder, "file_upload": file }];
let formData: FormData = new FormData();
formData.append("folder_name",folder );
formData.append("counselor",array1 );

it return counselor:[Object Object]

Code :

let options = new RequestOptions({ headers: headers });
let array1;

array1 = [{ "subfolder_name": subfolder, "file_upload": file }];
let formData: FormData = new FormData();
formData.append("folder_name",folder );
formData.append("counselor",array1 );

it return counselor:[Object Object]

• javascript
• angularjs
• multipartform-data

Share Improve this question Follow edited Nov 13, 2017 at 8:47 Darshan Patel 2,89722 gold badges2626 silver badges3939 bronze badges asked Nov 13, 2017 at 8:14 sam_programmersam_programmer 5133 silver badges1010 bronze badges 4

• File which is an image ,Am trying to append array1 into counselor,but in return am getting [Object Object] – sam_programmer Commented Nov 13, 2017 at 8:19
• Could you provide some more context? It would be useful to see the code that is returning the unwanted counselor:[Object Object] and also it would be useful to see the bigger picture. What are you trying to do in general? – Rocky Sims Commented Nov 13, 2017 at 8:30
• Am trying to post a parameter 'folder_name' and 'counselor folder',In counselor value am adding an array ,in that array which includes sub_folder as a text value and file_upload as one iimage upload ,these all am trying in angular 4 – sam_programmer Commented Nov 13, 2017 at 8:41
• The only valid types for FormData's field-value are USVString and Blob/File. To send an object structure, you will have to stringify it (generally with JSON.stringify). File objects can't be stringified, you will have to give them their own field. – Kaiido Commented Nov 13, 2017 at 8:58

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1 Answer 1

Sorted by: Reset to default 5

FormData is an interface to construct set of key-value pairs, therefore, it does not support any kind of nested structure, but you could, however, denote nesting in the key like so:

let array1 = [{ "subfolder_name": "foo", "file_upload": "bar" }];
let formData = new FormData();
formData.append('counselor[0].subfolder_name', array1[0].subfolder_name );
formData.append('counselor[0].file_upload', array1[0].file_upload );

for (let pair of formData.entries()) {
    console.log(pair[0] + ': ' + pair[1]); 
}

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