I am adding rows to an HTML table which already has 2 rows, using below javascript code:
<table id="dataTable" class="CSSTableGenerator">
<tbody>
<tr>
<td><label>No.of internal corners</label></td>
<td><input type="text" id="intCorner" class="corner"></td>
<td><label>No.of external corners</label></td>
<td><input type="text" id="extCorner" class="corner"></td>
</tr>
</tbody>
<tr>
<td><label>Wall 1</label></td>
<td><label>Wall 2</label></td>
<td><label>Wall 3</label></td>
<td><label>Wall 4</label></td>
</tr>
<tr>
<td><input type="text" id="wall00" class="wall"></td>
<td><input type="text" id="wall01" class="wall"></td>
<td><input type="text" id="wall02" class="wall"></td>
<td><input type="text" id="wall03" class="wall"></td>
</tr>
</tbody>
</table>
<input type="button" value="Add more walls" onclick="addRow('dataTable')">
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var cell0 = row.insertCell(0);
var element0 = document.createElement("input");
element0.type = "text";
element0.name = "txtbox[]";
element0.className ="wall";
element0.id="wall"+rowCount-2+"0";
cell0.appendChild(element0);
var cell1 = row.insertCell(1);
var element1 = document.createElement("input");
element1.type = "text";
element1.name = "txtbox[]";
element1.className ="wall";
element1.id="wall"+rowCount-2+"1";
cell1.appendChild(element1);
var cell2 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "txtbox[]";
element2.className ="wall";
element2.id="wall"+rowCount-2+"2";
cell2.appendChild(element2);
var cell3 = row.insertCell(3);
var element3 = document.createElement("input");
element3.type = "text";
element3.name = "txtbox[]";
element3.className ="wall";
element3.id="wall"+rowCount-2+"3";
cell3.appendChild(element3);
}
But when I use below code to get value of dynamically added cells it says that document.getElementById()
is null inside for
loop. It works for cells added by HTML code.
function sumOppositeWalls(){
var table = document.getElementById('dataTable');
var rowCount = table.rows.length;
alert(rowCount);
var minusCount=0;
for(var i=0;i<rowCount-2;i++){
var wall1=parseFloat(document.getElementById('wall'+i+'0').value);
var wall2=parseFloat(document.getElementById('wall'+i+'1').value);
}
Please suggest any solution or let me know if I am doing some mistake.
The problem is how is are creating the id
for the dynamic elements.
You are using numeric subtraction along with string concatenation like element2.id="wall"+rowCount-2+"2";
which is wrong.
You need to separate the numerical computation out as a separate unit, else "wall"+rowCount
will get processed with will give wall2
then 'wall2' - 1
will be NaN
since one operand is not a number so the end result will be something like NaN2
element2.id="wall"+(rowCount-2)+"2";
Since you are using the rowCount-2
value in multiple places, use a variable
var idCounter = rowCount - 2;
then
element0.id = "wall" + idCounter + "0";
Demo: Fiddle
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