Javascript formdata is empty when trying to append values in it

Question

following is my code when i do console.log(formData); its empty. Cannot see a reason for it to fail down.

$("#add_meal_item").on('click', '#save_meal_item', function () {
                var meal_name = $("#add_meal_item_form").find('#meal_name').val();
                var meal_type = $("#add_meal_item_form").find('#meal_type').val();
                var logoImg = $("#add_meal_item_form").find('#meal_image').get(0).files[0];
                var formData = new FormData();
                formData.append('logo', logoImg);
                formData.append('meal_type', meal_type);
                formData.append('meal_name', meal_name);
                console.log(formData);
                var ajax_url = baseurl + '/save_meal_item';
                $.ajax({
                    url: ajax_url,
                    type: 'POST',
                    data: formData,
                    success: function (response) {

                    }
                });

            });

A `FormData` instance is not like a normal object (if it were you could just use one), logging it to the console does not display it's contents. Are you not seeing the data server-side? — Jared Smith, Nov 15 '17 at 13:10
Possible duplicate of [How to inspect FormData?](https://stackoverflow.com/questions/17066875/how-to-inspect-formdata) — Jared Smith, Nov 15 '17 at 13:12

YouneL · Accepted Answer · 2017-11-15T13:32:08.843

4

You need to get elements values first and then append them to formData, Like this:

var meal_name = $("#add_meal_item_form").find('#meal_name').val();
formData.append('meal_name ', meal_name );

And to show all formData keys and values you have to use FormData.entries method :

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

edited Nov 15 '17 at 13:32

answered Nov 15 '17 at 13:05

YouneL

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regardless its still the same, i will edit my question to ease out with `val()` – noobie-php Nov 15 '17 at 13:06

score 2 · Answer 2 · answered Nov 15 '17 at 13:21

FormData.append() doesn't create enumerable properties for formData, you need to use the iterator from FormData.entries to iterate the values.

Demo

var formData = new FormData();
formData.append('logo', "11");
formData.append('meal_type', "22");
formData.append('meal_name', "33");

console.log(Object.keys(formData)); //[]
console.log(JSON.stringify(formData)); //{}

//use iterator
var formEntries = formData.entries();
//console.log(formEntries.next().value); 
//console.log(formEntries.next().value); 
//console.log(formEntries.next().value); 

//or simply use Array.from
var formEntries = Array.from(formData.entries());
console.log("formEntries " , formEntries);

Javascript formdata is empty when trying to append values in it

2 Answers2