document.querySelector("#myTextField").onchange = displaySqrts; function displaySqrts() { let maximum = Number(document.querySelector("#myTextField").value); let answer = "<table border='1'>"; for (let i = 1; i <= maximum; i++) { answer += "<tr>"; answer += "<td>" + i + "</td>"; answer += "<td>" + Math.sqrt(i) + "</td>"; answer += "</tr>"; } answer += "</table>"; document.querySelector("#displayArea").innerHTML = answer; }