I want to have a table with no rows initially and after that to create each row dynamically and also to be able to delete every row. I got Cannot read property 'childNodes' of undefined Please let me know how it should be done, Thank you.
function addRow() {
var table = document.getElementById("myTable");
var row = table.insertRow(0);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
cell1.innerHTML = "NEW CELL1";
cell2.innerHTML = "NEW CELL2";
}
function deleteRow(tableID) {
try {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
for (var i = 0; i < rowCount; i++) {
var row = table.rows[i];
var chkbox = row.cells[0].childNodes[0];
table.deleteRow(i);
rowCount--;
i--;
}
} catch (e) {
alert(e);
}
}<!DOCTYPE html>
<html>
<head>
<style>
table,
td {
border: 1px solid black;
}
</style>
</head>
<body>
<p>Click the button to add a new row at the first position of the table and then add cells and content.</p>
<table id="myTable">
<TR>
</TR>
</table>
<br>
<button type="button" onclick="addRow()">Add</button>
<button type="button" onclick="deleteRow('myTable')">Delete</button>
</body>
</html>I want to have a table with no rows initially and after that to create each row dynamically and also to be able to delete every row. I got Cannot read property 'childNodes' of undefined Please let me know how it should be done, Thank you.
function addRow() {
var table = document.getElementById("myTable");
var row = table.insertRow(0);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
cell1.innerHTML = "NEW CELL1";
cell2.innerHTML = "NEW CELL2";
}
function deleteRow(tableID) {
try {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
for (var i = 0; i < rowCount; i++) {
var row = table.rows[i];
var chkbox = row.cells[0].childNodes[0];
table.deleteRow(i);
rowCount--;
i--;
}
} catch (e) {
alert(e);
}
}<!DOCTYPE html>
<html>
<head>
<style>
table,
td {
border: 1px solid black;
}
</style>
</head>
<body>
<p>Click the button to add a new row at the first position of the table and then add cells and content.</p>
<table id="myTable">
<TR>
</TR>
</table>
<br>
<button type="button" onclick="addRow()">Add</button>
<button type="button" onclick="deleteRow('myTable')">Delete</button>
</body>
</html>-
Do you want to delete the first row every time when you click
Deletebutton? – DecPK Commented Jun 12, 2021 at 7:18 - I want to delete each existing row when I click Delete.. so after to can update the table with new rows... – Cameron121341 Commented Jun 12, 2021 at 7:19
-
Why do you even have
var chkbox = row.cells[0].childNodes[0];? it doesn't do anything except throw an error – Kinglish Commented Jun 12, 2021 at 7:20 - @Cameron121341 Still not clear what exactly do you want? – DecPK Commented Jun 12, 2021 at 7:21
6 Answers
Reset to default 2To delete all rows just remove the html from the table
function deleteRow(tableID) {
let table = document.getElementById(tableID)
table.innerHTML = "";
}
The function deleteRow() looks misleading. As you pass the entire table to delete. So why not adding a button "Delete" to each row you create. If you want to delete all rows see the modification, I've changed your function deleteRow(tableID) to deleteAllTableRows(tableID)
function deleteThisRow() {
this.closest('tr').remove()
}
function addRow() {
/* create a span element ("Delete") with an event listener "deleteThisRow" */
let deleteButton = document.createElement('span');
deleteButton.innerHTML = 'Delete';
deleteButton.addEventListener('click', deleteThisRow);
var table = document.getElementById("myTable");
var row = table.insertRow(0);
var cell0 = row.insertCell(0);
var cell1 = row.insertCell(1);
var cell2 = row.insertCell(2);
cell0.innerHTML = "NEW CELL1";
cell1.innerHTML = "NEW CELL2";
cell2.append(deleteButton); // add the "Delete" button to each row
}
function deleteAllTableRows(tableID) {
var rows = document.querySelectorAll('#' + tableID + ' tr ')
rows.forEach( row => {
row.remove()
});
}table,
td {
border: 1px solid black;
}<p>Click the button to add a new row at the first position of the table and then add cells and content.</p>
<table id="myTable"></table>
<br>
<button type="button" onclick="addRow()">Add</button>
<button type="button" onclick="deleteAllTableRows('myTable')">Delete all rows</button>The deleteRow() method removes the row at the specified index from a table. Maybe you should change
for (var i = 0; i < rowCount; i++) {
table.deleteRow(0);;
}
You can achieve it by simply changing your deleteRow() function like below. Whereas row.cells[0].childNodes[0] gives you error. row.cells[0] gives you HTML code, similar to like this - <td>NEW CELL1</td>. The childNode of that HTML does not have any information. So, always throws an error.
function addRow() {
var table = document.getElementById("myTable");
var row = table.insertRow(0);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
cell1.innerHTML = "NEW CELL1";
cell2.innerHTML = "NEW CELL2";
}
function deleteRow(tableID) {
document.getElementById(tableID).innerHTML = "";
}<!DOCTYPE html>
<html>
<head>
<style>
table,
td {
border: 1px solid black;
}
</style>
</head>
<body>
<p>Click the button to add a new row at the first position of the table and then add cells and content.</p>
<table id="myTable">
<tr>
</tr>
</table>
<br>
<button type="button" onclick="addRow()">Add</button>
<button type="button" onclick="deleteRow('myTable')">Delete</button>
</body>
</html>Maybe you should change
var chkbox = row.cells[0].childNodes[0];
into:
var chkbox = row.childNodes[0].childNodes[0];
- tableID.innerHTML=""; , is an easy way to clear all elements inside that table.
- If the table is empty, there is no childNodes. Then it is undefined.