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Delete a row from a table using JavaScript

I have a table of rows and a button to delete it in each row.
I can remove a row bot the problem is that I need to update the value deleteRow(nb_of_rows) in every time I remove a row
This is the table code in HTML
<input type="button" id="insert_row" value="Insert Row" onclick="insert_row()" >
<br><br>
<table id="mytable" width="100%" border="2" >
<tr>
<th>Sr.</th>
<th>Item Name</th>
<th>Price</th>
<th>Count</th>
<th>Total</th>
<th>Delete</th>
</tr>
</table>
and this is JavaScript code
var srn = 0;
function insert_row(){
var table = document.getElementById("mytable")
var nb_of_rows = document.getElementById("mytable").rows.length;
var row = table.insertRow(nb_of_rows);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
var cell5 = row.insertCell(4);
var cell6 = row.insertCell(5);
cell1.innerHTML = changeSR();
var delete_btn = document.createElement("input");
delete_btn.type = "button";
delete_btn.className = "btn";
delete_btn.value = "Delete";
cell6.appendChild(delete_btn);
delete_btn.onclick = function deleteRow(){
return document.getElementById("mytable").deleteRow(nb_of_rows);
}
}
function changeSR(){
return srn = srn + 1 ;
}
and this is an online share of my code
enter link description here

The issue occurs because the index in nb_of_rows is in danger of being out of date by the time the button is clicked (especially if other rows and have been added and deleted in the meantime). Therefore it will either delete the wrong row, or crash because the index doesn't exist in the table any more.
The solution is fairly simple: make the button get the parent row it belongs to, and then get that row's current index at the point of deletion, rather than relying on the index it had when it was added.
Usefully the row element has an index property telling you its current index in the table body, which makes this solution possible.
Here's the event code you need:
delete_btn.onclick = function deleteRow() {
var row = this.parentElement.parentElement; //get the parent of the parent (i.e. the first parent is the table cell, and the parent of that is the row)
document.getElementById("mytable").deleteRow(row.rowIndex);
}
(BTW it makes no sense really to have a return statement in an event handler, since the control returns to somewhere in the JS event-handling engine, not to your code, so I removed that at the same time.)
Demo:
var srn = 0;
function insert_row() {
var table = document.getElementById("mytable")
var nb_of_rows = document.getElementById("mytable").rows.length;
var row = table.insertRow(nb_of_rows);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var cell4 = row.insertCell(3);
var cell5 = row.insertCell(4);
var cell6 = row.insertCell(5);
cell1.innerHTML = changeSR();
var delete_btn = document.createElement("input");
delete_btn.type = "button";
delete_btn.className = "btn";
delete_btn.value = "Delete";
cell6.appendChild(delete_btn);
delete_btn.onclick = function deleteRow() {
var row = this.parentElement.parentElement;
document.getElementById("mytable").deleteRow(row.rowIndex);
}
}
function changeSR() {
return srn = srn + 1;
}
<input type="button" id="insert_row" value="Insert Row" onclick="insert_row()">
<br><br>
<table id="mytable" width="100%" border="2">
<tr>
<th>Sr.</th>
<th>Item Name</th>
<th>Price</th>
<th>Count</th>
<th>Total</th>
<th>Delete</th>
</tr>
</table>

Javascript CreateElement button

I have a problem I been suffering on for a couple hours now.
The context is, I need to make a button with action listener in JavaScript and add it into a table.
Here is the code I have
var _button = document.createElement("button");
_button.data = _a;
_button.innerHTML = 'click me';
_button.onclick = function()
{
alert("hello, world");
}
var table = document.getElementById("tableOnline");
var row = table.insertRow(1);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var _weakbutton = _button.outerHTML;
_weakbutton.onclick = function()
{
alert("hello, world");
}
cell1.innerHTML = "h";
cell2.innerHTML = "o";
cell3.innerHTML = _weakbutton;
The code works if I add the create the button and add it onto the body (without weakButton), but how can I make it work into a table?
Kind regards,
Zhendos.
EDIT:
Because requested, here is the table we talk about.
<div class = "container">
<div class = "table">
<thead id = "thead">
<tr>
<th> firstname <th>
<th> lastname </th>
<th> organisation </th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>

Instead of var _weakbutton = _button.outerHTML; create a copy of the button with var _weakbutton = _button.cloneNode(true);. This will create a new button, based on your original one.
Because this is now a button node, you can't add it with cell3.innerHTML = _weakbutton; but have to use cell3.appendChild( _weakbutton );
So, with your code it would be
var _button = document.createElement("button");
_button.data = "hi";
_button.innerHTML = 'click me';
_button.onclick = function()
{
alert("hello, world");
}
var table = document.getElementById("tableOnline");
var row = table.insertRow(0);
var cell1 = row.insertCell(0);
var cell2 = row.insertCell(1);
var cell3 = row.insertCell(2);
var _weakbutton = _button.cloneNode(true)
_weakbutton.onclick = function()
{
alert("hello, world");
}
cell1.innerHTML = "h";
cell2.innerHTML = "o";
cell3.appendChild( _weakbutton );
<table id="tableOnline"></table>

Adding new row to HTML table dynamically with JScript

I am writing a code in HTML + Jquery and need to add rows to a table dynamically.
I've written the code to add the rows dynamically, but it doesn't seem to work.
Here is my JScript code :
<script language="JavaScript">
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
var element1 = document.createElement("input");
element1.type = "date";
element1.name="datebox[];
element1.id = "dt";
cell1.appendChild(element1);
var cell2 = row.insertCell(1);
cell2.innerHTML = rowCount + 1;
var element2 = document.createElement("input");
element2.type = "select";
element2.name = "selectbox[]";
element2.id = "slct";
cell2.appendChild(element2);
var cell3 = row.insertCell(2);
cell3.innerHTML = rowCount + 1;
var element3 = document.createElement("input");
element3.type = "text";
element3.name = "txtbox[]";
element3.id = "txt";
cell3.appendChild(element3);
table.appendChild(cell1);
}
</script>
This is my Table:
<table id = "tab" style="width:500px">
<tr>
<th>Date</th>
<th>Treatment Goal</th>
<th>Comment</th>
</tr>
<tr>
<td><INPUT type="date" name="datebox[]" id = "dt"/></td>
<td>
<SELECT name="selectbox[]" id = "slct">
</SELECT>
</td>
<td><INPUT type="text" name="txtbox[]" id = "txt"/></td>
</tr>
</table>
I am calling the function in the onClick event of a button like this :
<input type="button" id="add" value="+" name="Add" onclick="addRow('tab')"/>
The html page doesn't respond to the click event and nothing happens.
Cannot understand what's going wrong.

Working Fiddle
The first problem is a syntax error on this line (you didn't close the double quote):
element1.name="datebox[];
^ missing "
The second problem is you are appending the cell to the table which is wrong, you should be appending the row:
table.appendChild(row);
^ changed to row from cell

You are missing a quotation mark on the line:
element1.name="datebox[];
after the name element.

Javascript / Ajax - onchange event for dynamically added row

I have a HTML table and i can add a new row to that table using javascript.
I want to call a javascript (Ajax) function using the onchange event for each of the cells on the table.
`
<script type="text/javascript" src="nextTest.js"></script>
<SCRIPT language="javascript">
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
cell1.innerHTML = rowCount + 1;
var cell2 = row.insertCell(1);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "txtbox[]";
element2.onchange = nexttest();
cell2.appendChild(element2);
}
</SCRIPT>
</HEAD>
<body>
<INPUT type="button" value="Add Row" onclick="addRow('dataTable')" />
<TABLE id="dataTable" width="350px" border="1">
<TR>
<TD> 1 </TD>
<TD> <INPUT type="text" /> </TD>
</TR>
</TABLE>
</body>
</html>`
When i press the button, a new row is added and the onchange event is fired.
What i want to do is when ever someone enters data into those new cells, i want the onchange event to fire. The event is called 'nextTest' and it is stored in an external file.
When i insert the new row, the event fires, but if i update one of the cells, nothing happens.
What am i doing wrong?
Thanks in advance

you must assign a function, not a function-call(except the called function returns another function).
Omit the parentheses:
element2.onchange = nexttest;

function nexttest(evt){
alert(evt.target.value);
}
function addRow (tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
cell1.innerHTML = rowCount + 1;
var cell2 = row.insertCell(1);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "txtbox[]";
element2.onchange = nexttest; // give a valid function identifier here .
cell2.appendChild(element2);
}
http://jsbin.com/iropam/2/edit

Form within table contains dynamically created input parameters that are not being passed in IE 9 and 10

var i = 0;
var a = 3;
function addNewAnswer(tableID) {
var table = document.getElementById(tableID);
if(i < 10)
{
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell1 = row.insertCell(0);
cell1.innerHTML = '<font size="2" face="Courier New"><b>Enter Answer ' + String.fromCharCode(67+i) + ':</b></font>';
var cell2 = row.insertCell(1);
var element1 = document.createElement("input");
element1.size = 40;
element1.type = "text";
element1.name = "answer"+a;
cell2.appendChild(element1);
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "radio";
element2.name = "radios";
element2.value = String.fromCharCode(67+i);
cell3.appendChild(element2);
i++;
a++;
}
}
My HTML Form:
<table>
<tr>
<form method=post name="submitform" action="verify-qedit.jsp">
<td>
<form method=post name="submitform" action="verify-qedit.jsp">
<table id="dataTable">
<tr>
<th colspan="3" align="left">Question</th>
</tr>
</table>
</form>
</td>
</form>
</tr>
</table>
When I submit the form, I only can retrieve the parameters not created by the above javascript. It only works in compatibility mode - IE 8 standards and below. Please help because I have spent days trying to find out before posting this question.

Does this work on all the browsers you are targetting?
http://jsfiddle.net/4nbB5/1
function addNewAnswer(tableID) {
var rowCount, row, cell1, cell2, cell3, element1, element2, char;
var i = 0;
var table = document.getElementById(tableID);
while (i < 10) {
rowCount = table.rows.length;
row = table.insertRow(rowCount);
cell1 = row.insertCell(0);
char = String.fromCharCode(65 + i);
cell1.innerHTML = '<font size="2" face="Courier New"><b>Enter Answer ' + char + ':</b></font>';
cell2 = row.insertCell(1);
element1 = document.createElement("input");
element1.size = 40;
element1.type = "text";
element1.name = "answer" + i;
cell2.appendChild(element1);
cell3 = row.insertCell(2);
element2 = document.createElement("input");
element2.type = "radio";
element2.name = "radios";
element2.value = char;
cell3.appendChild(element2);
i++;
}
}
addNewAnswer('foo');
All I did was remove 'a', and declare 'i', change 'if' to while, changed 67 in fromCharCode to 65.. Looked to be what you may have wanted at some point so I stopped.

The problem had nothing to do with the javascript. It was because I was putting the form tag in the wrong place within the table after the tr tag instead of after the td tag.
<table>
<tr>
<td>
<form method=post name="submitform" action="verify-qedit.jsp">
<table id="dataTable">
<tr>
<th colspan="3" align="left">Question</th>
</tr>
</table>
</form>
</td>
</tr>
</table>