JSFiddle - React, Tailwind, and code Playground

HTML

<div data-role="page" data-theme="a">
    <div data-role="content">
        <form id='inputform' method="post" action="/Detail/SaveFullDocument?_entity=DokG&amp;_id=0">
            <fieldset>
                <div class='form-field'>
                    <label class='form-label' for='Tasudok'>Order number</label>
                    <input class='ui-widget-content ui-corner-all form-fullwidth' data-index="1" id='Tasudok' name='Tasudok' value='' maxlength='25' />
                </div>
                <input type="hidden" name="_rows" />
                <table id="tableId">
                    <tr>
                        <th>Product code</th>
                        <th>Quantity</th>
                        <td>
                            <input type="button" value="+" onclick="addRow('tableId')" />
                        </td>
                    </tr>
                    <tr>
                        <td>
                            <input type="text" name="Toode" data-index="2" />
                        </td>
                        <td>
                            <input type="number" name="Kogus" data-index="3" />
                        </td>
                        <td>
                            <input type="button" value="-" onclick="deleteRow(this)" />
                        </td>
                    </tr>
                </table>
                <input type="button" value="+" onclick="addRow('tableId')" />
                <input type="submit" value='Save order' />
            </fieldset>
        </form>
    </div>
</div>

JavaScript

$('#inputform').on('keydown', 'input', function (event) {
    if (event.which == 13) {
        event.preventDefault();
        var $this = $(event.target);
        var index = parseFloat($this.attr('data-index'));
        $('[data-index="' + (index + 1).toString() + '"]').focus();
    }
});