Develop Reference

Accessing table calls for writing and reading

I want to insert the options in the last cell of the table. Please let me know how to access the properties of a Combobox for reading and writing.
var DeviceNames = new Array ("Dev1", "Dev2");
function addoption(select_id, text, rowcnt) {
select=document.getElementById(select_id);
var row = select.rows[rowcnt-1];
var rowObj = row.cells[4];
var option = document.createElement("option");
option.innerHTML = text;
option.value = 1;
rowObj.options.add(option);
}
function loadcombo(select_id, option_array, cnt)
{
for (var i = 0; i < option_array.length; i++)
{
addoption (select_id, option_array[i], cnt);
}
}
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
//Column 1
var cell1 = row.insertCell(0);
cell1.innerHTML = rowCount+1;
//Column 2
var cell2 = row.insertCell(1);
var element2 = document.createElement("input");
element2.type = "text";
cell2.appendChild(element2);
var cell3 = row.insertCell(2);
var element3 = document.createElement("input");
element3.type = "text";
cell3.appendChild(element3);
var cell4 = row.insertCell(3);
var element4 = document.createElement("input");
element4.type = "text";
cell4.appendChild(element4);
var cell5 = row.insertCell(4);
var element5 = document.createElement("select");
cell5.appendChild(element5);
loadcombo(tableID, DeviceNames, rowCount);
}
<INPUT type="button" value="Add Entry" onclick="addRow('dataTable')" />
<INPUT type="button" value="Insert Entry" onclick="addRow('dataTable')" />
<INPUT type="button" name="button1" value="Delete Entery" onclick="removeRow('button1')" />
<TABLE id="dataTable" width="350px" border="1">
<TR>
<TD></TD>
</TR>
</TABLE>
I want to insert the options in the last cell of the table. Please let me know how to access the properties of a Combobox for reading and writing.

Program Design
Without a specification code can get confused, so let's assume a spec of
Click the Add button to add a table row with a row number in the first column, several input elements in following columns, and a select element in the last column
All select elements should have options for entries in the DeviceNames array.
Each option should have a value attribute taken from the index of option text in DeviceNames. The example below calculates value using a ones based index but can always be changed to suite requirements.
Changes
Select elements didn't have id's. It would be possible to give them id or name attribute based on the table row they occur in, but the code snippet below does not attempt to do so.
HTMLSelectElement elements have an add method to add options.
Element objects themselves are passed as parameters to functions which need to operate on the DOM object.
A minor change: use textContent rather than innerHTML if the content is text. While innerHTML may work, it parses text inserted as HTML markup.
Snippet
var DeviceNames = new Array ("Dev1", "Dev2");
function addoption(select, text, optionValue) {
var option = document.createElement("option");
option.textContent = text;
option.value = optionValue;
select.add(option);
}
function loadcombo(select, option_array) {
for (var i = 0; i < option_array.length; i++) {
var value = i+1;
addoption (select, option_array[i], value);
}
}
function addRow(tableID) {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
//Column 1
var cell1 = row.insertCell(0);
cell1.textContent = rowCount+1;
//Column 2
var cell2 = row.insertCell(1);
var element2 = document.createElement("input");
element2.type = "text";
cell2.appendChild(element2);
var cell3 = row.insertCell(2);
var element3 = document.createElement("input");
element3.type = "text";
cell3.appendChild(element3);
var cell4 = row.insertCell(3);
var element4 = document.createElement("input");
element4.type = "text";
cell4.appendChild(element4);
var cell5 = row.insertCell(4);
var select = document.createElement("select");
cell5.appendChild(select);
loadcombo(select, DeviceNames);
}
<INPUT type="button" value="Add Entry" onclick="addRow('dataTable')" />
<INPUT type="button" value="Insert Entry" onclick="addRow('dataTable')" />
<INPUT type="button" name="button1" value="Delete Entry" onclick="removeRow('button1')" />
<TABLE id="dataTable" width="350px" border="1">
<TR>
<TD></TD>
</TR>
</TABLE>

How to read row wise column value using javascript

I have to validate a table column using javascript.But I am not able to get row wise column value.I am generating this table using java script function like add row and add column. I have to submit data to insert into database .Before submission I have to check quantity and perunit price should be numeric value.
But I am not able to apply appropriate javascript API to get particular row wise column value.
please check this image
I am posting the code for what i did
<script language="javascript">
// Add row to the HTML table
function addRow() {
var table = document.getElementById('my_table'); //html table
var rowCount = table.rows.length; //no. of rows in table
var columnCount = table.rows[0].cells.length; //no. of columns in table
var row = table.insertRow(rowCount); //insert a row
var cell1 = row.insertCell(0); //create a new cell
var element1 = document.createElement("input"); //create a new element
element1.type = "checkbox"; //set the element type
element1.setAttribute('id', 'newCheckbox'); //set the id attribute
element1.setAttribute('checked',true); //set the id attribute
cell1.appendChild(element1); //append element to cell
var cell2 = row.insertCell(1);
var element2 = document.createElement("input");
element2.type = "text";
element2.setAttribute('id', 'newInput'); //set the id attribute
element2.setAttribute('name', 'sl'+rowCount);
element2.setAttribute('style', 'width: 50px');
cell2.appendChild(element2);
var cell3 = row.insertCell(2);
var element3 = document.createElement("input");
element3.type = "textarea";
element3.setAttribute('rows', '4');
element3.setAttribute('cols','40');
element3.setAttribute('id', 'newInput'); //set the id attribute
element3.setAttribute('name', 'discription'+rowCount);
cell3.appendChild(element3);
var cell4 = row.insertCell(3);
var element4 = document.createElement("input");
element4.type = "text";
element4.setAttribute('id', 'newInput'); //set the id attribute
element4.setAttribute('name', 'quantity'+rowCount);
cell4.appendChild(element4);
var cell5 = row.insertCell(4);
var element5 = document.createElement("input");
element5.type = "text";
element5.setAttribute('id', 'newInput'); //set the id attribute
element5.setAttribute('name', 'price'+rowCount);
cell5.appendChild(element5);
var cell6 = row.insertCell(5);
var element6 = document.createElement("input");
element6.type = "text";
element6.setAttribute('id', 'newInput'); //set the id attribute
element6.setAttribute('name', 'CST'+rowCount);
element6.setAttribute('style', 'width: 50px');
cell6.appendChild(element6);
var cell7 = row.insertCell(6); //create a new cell
var element7 = document.createElement("input"); //create a new element
element7.type = "checkbox"; //set the element type
element7.setAttribute('id', 'vat5'); //set the id attribute
element7.setAttribute('name','tax'+rowCount);
element7.setAttribute('value','vat5');
cell7.appendChild(element7);
var cell8 = row.insertCell(7); //create a new cell
var element8 = document.createElement("input"); //create a new element
element8.type = "checkbox"; //set the element type
element8.setAttribute('id', 'vat14'); //set the id attribute
element8.setAttribute('name','tax'+rowCount);
element8.setAttribute('value','vat14') ;
cell8.appendChild(element8);
var cell9 = row.insertCell(8); //create a new cell
var element9 = document.createElement("input"); //create a new element
element9.type = "checkbox"; //set the element type
element9.setAttribute('id', 'serviceTax'); //set the id attribute
element9.setAttribute('name','tax'+rowCount);
element9.setAttribute('value','serviceTax');
cell9.appendChild(element9);
}
//Alert
// delete the selected rows from table
function deleteSelectedRows() {
var table = document.getElementById('my_table'); //html table
var rowCount = table.rows.length; //no. of rows in table
for(var i=0; i< rowCount; i++) { //loops for all row in table
var row = table.rows[i]; //return a particular row
var chkbox = row.cells[0].childNodes[0]; //get check box object
if(null != chkbox && true == chkbox.checked) { //wheather check box is selected
table.deleteRow(i); //delete the selected row
rowCount--; //decrease rowcount by 1
i--;
}
}
}
// append column to the HTML table
function addColumn() {
var tblHeadObj = document.getElementById('my_table').tHead; //table head
for (var h=0; h< tblHeadObj.rows.length; h++) {
var newTH = document.createElement('th');
tblHeadObj.rows[h].appendChild(newTH); //append ne th to table
newTH.innerHTML = 'Column '+ (tblHeadObj.rows[h].cells.length); //append th content to th
}
var tblBodyObj = document.getElementById('my_table').tBodies[0]; //table body
for (var i=0; i< tblBodyObj.rows.length; i++) {
var newCell = tblBodyObj.rows[i].insertCell(-1); //create new cell
newCell.innerHTML = 'cell '+ (tblBodyObj.rows[i].cells.length); //append data to cell
}
}
// delete table rows with index greater then 0
function deleteAllRows() {
var tbl = document.getElementById('my_table'); // table reference
lastRow = tbl.rows.length - 1; // set the last row index
// delete rows with index greater then 0
for (i = lastRow; i > 0; i--) {
tbl.deleteRow(i); //delete the row
}
}
// delete last table column
function deleteColumn() {
var allRows = document.getElementById('my_table').rows;
for (var i=0; i< allRows.length; i++) {
if (allRows[i].cells.length > 3) {
allRows[i].deleteCell(-1); //delete the cell
} else {
alert("You can't delete more columns.");
return;
}
}
}
function generate(){
var table = document.getElementById('my_table');
var rowCount = table.rows.length;
var f = document.form;
f.target = "_blank";
f.method="post";
f.action='ViewPO.jsp?rowCount='+rowCount;
f.submit();
}
function generate1(){
var table = document.getElementById('my_table');
var rowCount = table.rows.length;
document.write(rowCount)
var a;
var b=document.myform.punitprice.value;
var c=document.myform.ptax.value;
var regexLetter = /[a-zA-z]/;
for(var j=1;i<=rowcount;i++){
var oCells = table.rows.item(j).cells;
a=oCells[3].firstChild.data;
}
if(regexLetter.test(a)){
alert('Enter Only Numeric Values For ');
return false;
}
var f = document.form;
f.target = "";
f.method="post";
f.action='purchaseAction.jsp?rowCount='+rowCount;
// f.submit();
}
</script>
<table id="my_table" align="center" border="2" cellpadding="0" cellspacing="0">
<thead><tr>
<th>Select</th>
<th>Sl.no</th>
<th>Description of Services/Goods</th>
<th>Quantity</th>
<th>Price/Unit</th>
<th>CST %</th>
<th>VAT5.5%</th>
<th>VAT14.5%</th>
<th>ServiceTax%</th>
</tr>
</thead>
<tbody>
</tbody>
</table>
</div>
<br>
</center>
<center>
<hr/>
<bgcolor ="red"/>
<input type="button" value="Add row" name="add" onClick="addRow()"/>
<input type="button" value="Delete selected rows" name="delete_all" onClick="deleteSelectedRows()" />
<input type="button" value="Delete all rows" name="delete" onClick="deleteAllRows()" /><br/>
<hr/>
<p>
<input type="submit" value="Save" onclick="generate1()" />
<input type="submit" value="View PO" onclick="generate()"/>
</center>
<hr/>
</form>
</div>
Help me as soon as possible.

javascript dyanmic table add / delete row

I am trying to build a form for creating a list for image deployment.
I am able to create a dynamic table on form load and also collect the data for each value, but can seem to get the Add and Delete working.
My Question:
What must I do(or change) in my code to get the ADD and Delete options working and to export the table data in CSV format.
Please could someone help and/or guide me as I am getting so lost and really would like a working example .. there is so much on the net it's over-whelming
Newest place I visited is Mozilla DOM help pages what's confusing is how to load your own variables into the table
For reference I used stackoverflow and plenty google and finally this site
Here is my code:
<div id="metric_results">
Enter Target Name:
<input type="text" name="textbox1" id="textbox1" VALUE="win2k8"/>
<br>
<input type="button" id="create" value="Click here" onclick="Javascript:addTable()">
<input type="button" id="create" value="Add Row" onclick="Javascript:addRow()">
<input type="button" id="create" value="Delete Row" onclick="Javascript:deleteRow()">
</div>
<SCRIPT LANGUAGE="JavaScript">
window.onload =addTable;//loads table on window loading
function addTable() {
var myTableDiv = document.getElementById("metric_results")
var table = document.createElement('TABLE')
var tableBody = document.createElement('TBODY')
var imageName = textbox1.value
table.border = '1'
table.appendChild(tableBody);
var heading = new Array();
heading[0] = "imageName"
heading[1] = "acceptAllEula"
heading[2] = "noSSLverify"
heading[3] = "noVerification"
heading[4] = "TargetImagelocation"
heading[5] = "Username"
heading[6] = "Password"
heading[7] = "Target IP"
var imageInfo = new Array()
imageInfo[0] = new Array(imageName, "acceptAllEula", "noSSLverify", "noVerification", "testLocation", "user", "pass", "192.168.1.151")
imageInfo[1] = new Array("win2008", "acceptAllEula", "noSSLverify", "noVerification", "testLocation", "user", "pass", "192.168.1.151")
//TABLE COLUMNS
var tr = document.createElement('TR');
tableBody.appendChild(tr);
for (i = 0; i < heading.length; i++) {
var th = document.createElement('TH')
th.width = '75';
th.appendChild(document.createTextNode(heading[i]));
tr.appendChild(th);
}
//TABLE ROWS
for (i = 0; i < imageInfo.length; i++) {
var tr = document.createElement('TR');
for (j = 0; j < imageInfo[i].length; j++) {
var td = document.createElement('TD')
td.appendChild(document.createTextNode(imageInfo[i][j]));
tr.appendChild(td)
}
tableBody.appendChild(tr);
}
myTableDiv.appendChild(table)
}
function addRow() {
var table = document.getElementById(tableID);
var rowCount = table.rows.length;
var row = table.insertRow(rowCount);
var colCount = table.rows[0].cells.length;
var cell1 = row.insertCell(0);
var element1 = document.createElement("input");
element1.type = "checkbox";
element1.name="chkbox[]";
cell1.appendChild(element1);
var cell2 = row.insertCell(1);
cell2.innerHTML = rowCount + 1;
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "txtbox[]";
cell3.appendChild(element2);
}
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) {
table.deleteRow(i);
rowCount--;
i--;
}
}
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) {
table.deleteRow(i);
rowCount--;
i--;
}
}
}catch(e) {
alert(e);
}
</SCRIPT>

You're not setting any id to the table you're creating onload - so when you later come to call getElementById() inside addRow it cannot be found (and you're using a variable which does not exist - tableID!)
My suggestion is to take an id as a parameter to addTable, and set that as the id of the dynamically generated table:
function addTable(id) {
var myTableDiv = document.getElementById("metric_results")
var table = document.createElement('TABLE')
table.id = id;
....
onload, pass somethig sensible - default perhaps:
window.onload = function(){
addTable("default");
}
And either pass this in when adding a row, or use the default provided above:
function addRow() {
var table = document.getElementById("default");
....
or
function addRow(id) {
var table = document.getElementById(id);
Updated fiddle: https://jsfiddle.net/egtu5kay/5/
Left as an exercise for you: Correctly formatting the new row as you wish.

Unable to get value of dynamically generated cell using document.getElementById

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

How to add rows and columns dynamically in a listbox in javascript

I am trying to create 1500 rows each having 4 column/cells in list box.
All i wanted to do dynamically.
I have added a listbox using html as
HTML
<body onload="load()">
<div id="myform">
<select id ="listid" name="mytable" size="5" style="width: 100px;" >
</select>
<input type="button" id="create" value="Click here" onclick="Javascript:addTable()">
<!-- to create a Table and add srows and column JavaScript -->
</div>
</body>
javascript
note: i am able create row but dont know how to create column.
function addTable() {
var nofrow = 1500;
for (var i = 0; i < nofrow; i++) {
var opt = document.createElement("option");
document.getElementById("listid").options.add(opt);
// for (var j = 0; j < noofcell; j++) {
// not able to figure out what to add
//}
}

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 = "checkbox";
element1.name="chkbox[]";
cell1.appendChild(element1);
var cell2 = row.insertCell(1);
cell2.innerHTML = rowCount + 1;
var cell3 = row.insertCell(2);
var element2 = document.createElement("input");
element2.type = "text";
element2.name = "txtbox[]";
cell3.appendChild(element2);
}
Source Dynamically Add/Remove Rows In HTML Table Using JavaScript