emojionearea: Can not submit form with event keypress

I cant submit a form when pressing enter in textarea. It only works when I click to somewhere, then click to the textarea and press enter. My form

<form id="add-msg-form">
        <div class="panel-footer">
            <div class="input-group" style="display: -webkit-box" id="txtbox">
                <textarea id="txtMessage" placeholder="Vui lòng nhập nội dung tin nhắn" ></textarea>
                <span class="input-group-btn">
                    <button class="btn btn-info" id="btnSend" type="submit">Send</button>
                </span>
           </div>
    </div>
</form>

$(document).ready(function() {
    $("#txtMessage").emojioneArea({
        events: {
            keypress: function (editor, event) {
                if(event.which == 13){
                    console.log('event:keypress'); //work
                        $('#add-msg-form').submit(); //not work
                                        $('#txtMessage').val(''); //not work
                                }
            },
        }
    });
});