HTMLTableRowElement: cells Eigenschaft

<table>
 <thead>
 <tr>
 <th>C1</th>
 <th>C2</th>
 <th>C3</th>
 <th>C4</th>
 <th>C5</th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td>Cell 1</td>
 <td>Cell 2</td>
 </tr>
 </tbody>
</table>
<button id="add">Add a cell</button>
<button id="remove">Remove last cell</button>
<div>This first row has <output>2</output> cell(s).</div>

table {
 border-collapse: collapse;
}
th,
td,
table {
 border: 1px solid black;
}
button {
 margin: 1em 1em 1em 0;
}

// Obtain relevant interface elements
const bodySection = document.querySelectorAll("tbody")[0];
const row = bodySection.rows[0]; // Select the first row of the body section
const cells = row.cells; // The collection is live, therefore always up-to-date
const cellNumberDisplay = document.querySelectorAll("output")[0];
const addButton = document.getElementById("add");
const removeButton = document.getElementById("remove");
function updateCellNumber() {
 cellNumberDisplay.textContent = cells.length;
}
addButton.addEventListener("click", () => {
 // Add a new cell at the end of the first row
 const newCell = row.insertCell();
 newCell.textContent = `Cell ${cells.length}`;
 // Update the row counter
 updateCellNumber();
});
removeButton.addEventListener("click", () => {
 // Delete the row from the body
 row.deleteCell(-1);
 // Update the row counter
 updateCellNumber();
});

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