<form onsubmit="return spieces()"> <!---- <label for="fname">Nazwa przyprawy:</label><br>--> <input type="text" id="spiceName"> <input type="submit" value="Submit"> </form> var spiceslist = []; function spieces() { let boxvalue = document.getElementById("spiceName").value; spiceslist.push(boxvalue); console.log(spiceslist); return false; }