JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<form class="form card-content-ingredients" action="" id="form-id-0" enctype="multipart/form-data">
    <ul>
        <li class="form__item">
            <label class="form__label">Text</label>
            <input class="form__input form__input--textfield" type="text" name="description" value="" placeholder="description">
        </li>
        <li class="form__item">
            <label class="btn btn--invalid" for="file_0" >picture</label>
            <input class="form__input form__input--file" id="file_0" type="file" name="img" value="picture">
        </li>
        <ul class="form__item--multi-align-right">
            <li>
                <input class="btn btn--invalid" type="button" value="cancel">
            </li>
            <li>
                <input class="btn btn--invalid btn__save" type="button" value="Save" data-item-id="0" data-rqstpath="/echo/html/">
            </li>
        </ul>
    </ul>
</form>


<form class="form card-content-ingredients" action="" id="form-id-1" enctype="multipart/form-data">
    <ul>
        <li class="form__item">
            <label class="form__label">Text</label>
            <input class="form__input form__input--textfield" type="text" name="description" value="" placeholder="description">
        </li>
        <li class="form__item">
            <label class="btn btn--invalid" for="file_1" >picture</label>
            <input class="form__input form__input--file" id="file_1" type="file" name="img" value="picture">
        </li>
        <ul class="form__item--multi-align-right">
            <li>
                <input class="btn btn--invalid" type="button" value="cancel">
            </li>
            <li>
                <input class="btn btn--invalid btn__save" type="button" value="Save" data-item-id="1" data-rqstPath="/echo/html/">
            </li>
        </ul>
    </ul>
</form>

JavaScript

function updateSettingsAJAX( itemID, rqstPath) {
        if (!(typeof itemID !== typeof undefined && itemID !== false) || !(typeof rqstPath !== typeof undefined && rqstPath !== false)) {
            return false;
        }

        var formData = new FormData($('#form-id-' + itemID)[0]);


        formData.append("itemID", itemID);

        return $.ajax({
            type: "POST",
            url: rqstPath,
            data: formData,
            processData: false,
            contentType: false,
        });
    }

    $(function () {
        $('.btn__save').on('click', function () {
            return updateSettingsAJAX($(this).data('item-id'),$(this).data('rqstpath') );
        });
    });