Dynamically Add/Remove rows in HTML table using JavaScript

We will create a user interface where user can add/delete multiple rows in a form using JavaScript.
First check the user interface.
dynamic-add-delete-row-table-javascript
In this example, we have created a table which will display our html components. On pressing Add Row, a dynamic row will be created and added in the table. And on selecting the checkbox and pressing Delete Row, the row will be removed.
Following is the source.

Code


<HTML>
<HEAD>
<TITLE> Add/Remove dynamic rows in HTML table </TITLE>
<SCRIPT language="javascript">
function addRow(tableID) {

var table = document.getElementById(tableID);

var rowCount = table.rows.length;
var row = table.insertRow(rowCount);

var colCount = table.rows[0].cells.length;

for(var i=0; i<colCount; i++) {

var newcell = row.insertCell(i);

newcell.innerHTML = table.rows[0].cells[i].innerHTML;
//alert(newcell.childNodes);
switch(newcell.childNodes[0].type) {
case "text":
newcell.childNodes[0].value = "";
break;
case "checkbox":
newcell.childNodes[0].checked = false;
break;
case "select-one":
newcell.childNodes[0].selectedIndex = 0;
break;
}
}
}

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];
if(null != chkbox && true == chkbox.checked) {
if(rowCount <= 1) {
alert("Cannot delete all the rows.");
break;
}
table.deleteRow(i);
rowCount--;
i--;
}

}
}catch(e) {
alert(e);
}
}

</SCRIPT>
</HEAD>
<BODY>

<INPUT type="button" value="Add Row" onclick="addRow('dataTable')" />

<INPUT type="button" value="Delete Row" onclick="deleteRow('dataTable')" />

<TABLE id="dataTable" width="350px" border="1">
<TR>
<TD><INPUT type="checkbox" name="chk"/></TD>
<TD><INPUT type="text" name="txt"/></TD>
<TD>
<SELECT name="country">
<OPTION value="in">India</OPTION>
<OPTION value="de">Germany</OPTION>
<OPTION value="fr">France</OPTION>
<OPTION value="us">United States</OPTION>
<OPTION value="ch">Switzerland</OPTION>
</SELECT>
</TD>
</TR>
</TABLE>

</BODY>
</HTML>



For adding dynamic row in table, we have used insertRow() method. This method will insert a row at position specified by the index arguement. Also for removing row, we have used deleteRow() method.
Note that for inserting dynamic row, we have to created cells by using row.insertCell() method.

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