Develop Reference

JS and DOM, trying to create table

I tried to create table but I can't create td in every tr, td is creating only in first td what is in table, how I can solve the problem?
// Creating div
var main = document.createElement("div")
main.innerHTML = ""
document.body.appendChild(main)
main.setAttribute("id", "main")
//Creating Icons
var puzzleico = document.createElement("div")
puzzleico.innerHTML = ""
document.getElementById("main").appendChild(puzzleico)
puzzleico.setAttribute("id", "puzzleico")
var puzzleico = document.getElementById("puzzleico").onclick = function() {createtable()};
//Creating tr and td
function createtable() {
//Creating Table
var table = document.createElement("table")
table.innerHTML = ""
document.body.appendChild(table)
table.setAttribute("id", "table")
for (var i = 0; i < 50; i++) {
var tr = document.createElement("tr")
tr.innerHTML = ""
document.getElementById("table").appendChild(tr)
tr.setAttribute("id", "tr")
var td = document.createElement("td")
td.innerHTML = ""
document.getElementById("tr").appendChild(td)
}
}

Element id's within a document need to be unique. The issue here is that your document.getElementById("tr") will always return the first element it finds with that id and so, all of your <td> elements will be appended to the first <tr>.
In order to fix it you can remove the tr.setAttribute("id", "tr") line and use the already existing tr variable to append the td child to.
function createtable() {
//Creating Table
var table = document.createElement("table")
table.innerHTML = ""
document.body.appendChild(table)
table.setAttribute("id", "table")
for (var i = 0; i < 50; i++) {
var tr = document.createElement("tr")
tr.innerHTML = ""
document.getElementById("table").appendChild(tr);
var td = document.createElement("td");
td.innerHTML = "test"
tr.appendChild(td)
}
}
createtable();
The above code will work, but using the already declared variables instead of finding them again can also be applied to the table case. Also, table.innerHTML = "" doesn't add any value because the innerHTML is already empty when you create a new element.
function createtable() {
//Creating Table
var table = document.createElement("table");
document.body.appendChild(table);
for (var i = 0; i < 50; i++) {
var tr = document.createElement("tr");
table.appendChild(tr);
var td = document.createElement("td");
td.innerHTML = "test";
tr.appendChild(td);
}
}

You can use this to create the table:
function createTable(){
//Creating And Appending Child
let table = document.createElement('table');
document.body.appendChild(table);
for(let i = 0; i < 50; i++){
let tr = document.createElement('tr');
let td = document.createElement('td');
td.innerHTML = i;
tr.appendChild(td);
table.appendChild(tr);
}
}
Here is the link to my codepen:
https://codepen.io/prabodhpanda/pen/gOPLqYe?editors=1010

id attribute of each element in DOM should be unique. You set same id for each tr element you create. document.getElementById element always returns the first element match by the id. This is the reason of the issue. Your last code snippet should be:
function createtable() {
//Creating Table
var table = document.createElement("table")
table.innerHTML = ""
document.body.appendChild(table)
table.setAttribute("id", "table")
for (var i = 0; i < 50; i++) {
var tr = document.createElement("tr")
tr.innerHTML = ""
document.getElementById("table").appendChild(tr)
tr.setAttribute("id", "tr" + i) // Check this
var td = document.createElement("td")
td.innerHTML = ""
document.getElementById("tr" + i).appendChild(td) // Check this
}
}
tr.appendChild(td) should also work if you don't need ID attribute.

I edited your answer and got what I want.
//Creating tr and td
function createtable() {
//Creating Table
var table = document.createElement("table")
table.innerHTML = ""
document.body.appendChild(table)
table.setAttribute("id", "table")
for (var i = 0; i < 50; i++) {
var tr = document.createElement("tr")
tr.innerHTML = ""
document.getElementById("table").appendChild(tr)
tr.setAttribute("id", "tr")
for (var v = 0; v < 50; v++) {
var td = document.createElement("td")
td.innerHTML = ""
tr.appendChild(td)
}
}
}

How can i insert a label text in a table cell

I have a table which i am dynamically generating based on user input. I am trying to insert a label text into table cell on button click. onclick of button a label text of a demo method should be inserted into table cells. Can someone suggest me how can i do this?
Thanks.
Creating Table:
function CreateTable(){
var rowCtr;
var cellCtr;
var rowCnt;
var cellCnt;
var myTableDiv = document.getElementById('myDynamicTable');
var table = document.createElement('table');
table.setAttribute("contenteditable", "true");
table.border = "1";
table.id = "myTable";
var tableBody = document.createElement('tbody');
table.appendChild(tableBody);
rowCnt = document.getElementById('txtrows').value;
cellCnt = document.getElementById('txtcols').value;
for (rowCtr = 0; rowCtr < rowCnt; rowCtr++) {
var tr = document.createElement('tr');
tableBody.appendChild(tr);
for (cellCtr = 0; cellCtr < cellCnt; cellCtr++) {
var td = document.createElement('td');
td.width = '120';
td.appendChild(document.createTextNode("Row:" + rowCtr + " Column:" + cellCtr));
tr.appendChild(td);
}
}
myTableDiv.appendChild(table);
}
Button:
<asp:Button ID="button1" Text="button" runat="server" OnClick="demo" />
C# code:
public void demo()
{
TableCell tcell = new TableCell();
RadLabel rlbl = new RadLabel();
rlbl.Text = "test";
tcell.Controls.Add(rlbl);
}
protected void demo(object sender, EventArgs e)
{
demo();
}

To give you a start using Javascript, you can use below code as a starting point.
window.onload=function(){
CreateTable();
}
function CreateTable(){
var rowCtr;
var cellCtr;
var rowCnt;
var cellCnt;
var myTableDiv = document.getElementById('myDynamicTable');
var table = document.createElement('table');
table.setAttribute("contenteditable", "true");
table.border = "1";
table.id = "myTable";
var tableBody = document.createElement('tbody');
table.appendChild(tableBody);
rowCnt = 3; //document.getElementById('txtrows').value;
cellCnt =2; //document.getElementById('txtcols').value;
for (rowCtr = 0; rowCtr < rowCnt; rowCtr++) {
var tr = document.createElement('tr');
tableBody.appendChild(tr);
for (cellCtr = 0; cellCtr < cellCnt; cellCtr++) {
var td = document.createElement('td');
td.width = '120';
td.appendChild(document.createTextNode("Row:" + rowCtr + " Column:" + cellCtr));
tr.appendChild(td);
}
}
myTableDiv.appendChild(table);
}
function demo(){
var myTable=document.getElementById('myTable');
var cell=myTable.rows[0].cells[1];
var label = document.createElement('label');
label.id="lbl-"+cell.cellIndex;
label.innerText="This is label text";
cell.appendChild(label);
}
<input type="button" onclick="demo()" value="Create Label" />
<div id="myDynamicTable"></div>

Dynamically created table only displays last appended table data

I am working with Javascript where I've got a drop down list derived from an array (List of stream names) and whenever this array selection changes (onchange()) the details of the array( attributes and types) should be derived from two arrays (two 1d arrays- attributes, type) and displayed in a table form below the dropdown. I've written the function that displays the table within a division but it retrieves only the last data pair and appends it to the table. But I need all the data from the arrays to be displayed in each column so that they look as if they correspond each other.
JS Function to create the main array:
//Generate array to hold predefined Stream Definitions
function PredefinedStreams() {
var StreamArray = new Array(3);
for (var q = 0; q < 3; q++)
{
StreamArray[q] = new Array(4);
for (var w=1; w<3; w++)
{
StreamArray[q][w] = new Array(5);
}
}
StreamArray[0][0]="Stream1";
StreamArray[0][1][0]="1_attr1";
StreamArray[0][1][1]="1_attr2";
StreamArray[0][1][2]="1_attr3";
StreamArray[0][1][3]="1_attr4";
StreamArray[0][1][4]="1_attr5";
StreamArray[0][2][0]="1_type1";
StreamArray[0][2][1]="1_type2";
StreamArray[0][2][2]="1_type3";
StreamArray[0][2][3]="1_type4";
StreamArray[0][2][4]="1_type5";
StreamArray[0][3] = "define stream Stream1 (1_attr1 1_type1, 1_attr2 1_type2, 1_attr3 1_type3, 1_attr4 1_type4, 1_attr5 1_type5 );";
StreamArray[1][0]="Stream2";
StreamArray[1][1][0]="2_attr1";
StreamArray[1][1][1]="2_attr2";
StreamArray[1][1][2]="2_attr3";
StreamArray[1][1][3]="2_attr4";
StreamArray[1][1][4]="2_attr5";
StreamArray[1][2][0]="2_type1";
StreamArray[1][2][1]="2_type2";
StreamArray[1][2][2]="2_type3";
StreamArray[1][2][3]="2_type4";
StreamArray[1][2][4]="2_type5";
StreamArray[1][3] = "define stream Stream2 (2_attr1 2_type1, 2_attr2 2_type2, 2_attr3 2_type3, 2_attr4 2_type4, 2_attr5 2_type5 );";
StreamArray[2][0]="Stream3";
StreamArray[2][1][0]="3_attr1";
StreamArray[2][1][1]="3_attr2";
StreamArray[2][1][2]="3_attr3";
StreamArray[2][1][3]="3_attr4";
StreamArray[2][1][4]="3_attr5";
StreamArray[2][2][0]="3_type1";
StreamArray[2][2][1]="3_type2";
StreamArray[2][2][2]="3_type3";
StreamArray[2][2][3]="3_type4";
StreamArray[2][2][4]="3_type5";
StreamArray[2][3] = "define stream Stream3 (3_attr1 3_type1, 3_attr2 3_type2, 3_attr3 3_type3, 3_attr4 3_type4, 3_attr5 3_type5 );";
return StreamArray;
}
JS Function to retrieve individual stream data onto arrays:
var streams = '<select id="streamSelect" onchange="showStreamDef()">', streamtypes = PredefinedStreams();
var streamDef = streamtypes = PredefinedStreams();
var stream1_attr = streamtypes = PredefinedStreams();
var stream1_type = streamtypes = PredefinedStreams();
var stream2_attr = streamtypes = PredefinedStreams();
var stream2_type = streamtypes = PredefinedStreams();
var stream3_attr = streamtypes = PredefinedStreams();
var stream3_type = streamtypes = PredefinedStreams();
var PredefinedStreamComboDiv=document.createElement('div');
function createattr()
{
for (var q = 0; q < 3; q++)
{
streams += "<option value='"+streamtypes[q][0]+"'>"+streamtypes[q][0]+"</option>";
streamDef += streamtypes[q][3];
for (var w=0; w<3; w++)
{
for(var r=0; r<5;r++)
{
if(q==0 && w==1)
{
stream1_attr[r] = streamtypes[q][w][r];
}
if(q==0 && w==2)
{
stream1_type[r] = streamtypes[q][w][r];
}
if(q==1 && w==1)
{
stream2_attr[r]= streamtypes[q][w][r];
}
if(q==1 && w==2)
{
stream2_type [r]= streamtypes[q][w][r];
}
if(q==2 && w==1)
{
stream3_attr [r]= streamtypes[q][w][r];
}
if(q==2 && w==2)
{
stream3_type [r]= streamtypes[q][w][r];
}
}
}
}
streams += '</select>';
//streamDef += '</select>';
PredefinedStreamComboDiv.className="attr-combobox-style";
PredefinedStreamComboDiv.innerHTML= streams;
PredefinedStream.appendChild(PredefinedStreamComboDiv);
}
JS Function to create the table:
function showStreamDef()
{
alert("Displaying Stream Details");
var choice=document.getElementById("streamSelect");
var selectedStr = choice.options[choice.selectedIndex].text;
var myTableDiv = document.getElementById("streamDefDiv");
var table = document.createElement('TABLE');
var tableBody = document.createElement('TBODY');
table.border = '1';
table.appendChild(tableBody);
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode("Attribute"));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode("Type"));
tr.appendChild(td);
if(selectedStr=="Stream1")
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream1_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream1_type[d]));
tr.appendChild(td);
}
}
else if(selectedStr=="Stream2")
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream2_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream2_type[d]));
tr.appendChild(td);
}
}
else
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream3_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream3_type[d]));
tr.appendChild(td);
}
}
tableBody.appendChild(tr);
myTableDiv.appendChild(table);
document.getElementById('streamDefDiv').style.display = "block";
}

The issue was only with the function where I dynamically generate the table.
As shown in the question, I've appended the row(tr) to the tablebody only at the end. This causes only the last saved data pair row to be appended to the table. So in order to get each row to be appended: once each table data(td) is appended to a row( tr), that particular tr needs to be appended to the tablebody.
function showStreamDef()
{
var choice=document.getElementById("streamSelect");
var selectedStr = choice.options[choice.selectedIndex].text;
var myTableDiv = document.getElementById("streamDefDiv");
var table = document.createElement('TABLE');
var tableBody = document.createElement('TBODY');
table.border = '1';
table.appendChild(tableBody);
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode("Attribute"));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode("Type"));
tr.appendChild(td);
tableBody.appendChild(tr);
if(selectedStr=="Stream1")
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream1_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream1_type[d]));
tr.appendChild(td);
tableBody.appendChild(tr);
}
}
else if(selectedStr=="Stream2")
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream2_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream2_type[d]));
tr.appendChild(td);
tableBody.appendChild(tr);
}
}
else
{
for (var d = 0; d < stream1_attr.length; d++)
{
var tr = document.createElement('TR');
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream3_attr[d]));
tr.appendChild(td);
var td = document.createElement('TD');
td.appendChild(document.createTextNode(stream3_type[d]));
tr.appendChild(td);
tableBody.appendChild(tr);
}
}
myTableDiv.appendChild(table);
document.getElementById('streamDefDiv').style.display = "block";
}

Can't display the checkbox and button in every rows of td

I can't display the checkbox and button in every rows of td. Currently it appending in last rows td only. and how to append the checkbox and buttons in all rows in td.. Can anyone help me to do this?
for (var i = 0; i < obj.length; i++) {
var row = document.createElement("tr");
table.appendChild(row);
var cell = document.createElement("td");
row.appendChild(cell);
cell.appendChild(checkbox);
var cell = document.createElement("td");
row.appendChild(cell);
cell.innerHTML = i;
for (key in obj[i]) {
var cell = document.createElement("td");
row.appendChild(cell);
cell.innerHTML = obj[i][key];
}
var cell = document.createElement("td");
row.appendChild(cell);
cell.appendChild(btnEdit);
cell.appendChild(btnSave);
}
JsFiddle

Basically what is happening is you are moving the input/buttons every time you append them to the cell because it is the same element.
To fix this you must create the checkbox and buttons in your for loop.
for (var i = 0; i < obj.length; i++) {
var btnSave = document.createElement('button');
btnSave.setAttribute ("id","saveBtn");
btnSave.innerHTML = "Save";
var btnEdit = document.createElement('input');
btnEdit.type = "button";
btnEdit.value = "Edit";
var checkbox = document.createElement('input');
checkbox.type = "checkbox";
checkbox.id= "checkBox";
var row = document.createElement("tr");
table.appendChild(row);
var cell = document.createElement("td");
row.appendChild(cell);
cell.appendChild(checkbox);
var cell = document.createElement("td");
row.appendChild(cell);
cell.innerHTML = i;
for (key in obj[i]) {
var cell = document.createElement("td");
row.appendChild(cell);
cell.innerHTML = obj[i][key];
}
var cell = document.createElement("td");
row.appendChild(cell);
cell.appendChild(btnEdit);
cell.appendChild(btnSave);
}
Just as a side note, it is good practice that 'id' attributes be unique.
Hope this helps.

Some misunderstanding with creating dynamic table in JavaScript

I try to create dynamic table using JavaScript, the table contains two columns first name and family name.
Here is the JavaScropt code:
function CreatTable() {
var tablearea = document.getElementById('ShowDataID');
var table = document.createElement('table');
var thead = document.createElement("thead");
var tr = document.createElement('tr');
var th = document.createElement('th');
var firstNameTxt = document.createTextNode("First Name");
th.appendChild(firstNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
var familyNameTxt = document.createTextNode("Family Name");
th.appendChild(familyNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
for (var i = 1; i < 4; i++) {
var tr = document.createElement('tr');
tr.appendChild(document.createElement('td'));
tr.appendChild(document.createElement('td'));
tr.cells[0].appendChild(document.createTextNode('John'))
tr.cells[1].appendChild(document.createTextNode('McDowell'))
table.appendChild(tr);
}
tablearea.appendChild(table);
}
And here the the result I get:
My question is why do I get "McDowell" not under the family name column.Why it is shifted?What I am missing?

Try to create a new th for the second time, don't use the already used one
function CreatTable() {
var tablearea = document.getElementById('ShowDataID');
var table = document.createElement('table');
var thead = document.createElement("thead");
var tr = document.createElement('tr');
var th = document.createElement('th');
var firstNameTxt = document.createTextNode("First Name");
th.appendChild(firstNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
//********* Look here *****************
var familyNameTxt = document.createTextNode("Family Name");
th = document.createElement('th'); //*** Create a new th here. Dont use the old one
//********* Look here *****************
th.appendChild(familyNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
for (var i = 1; i < 4; i++) {
var tr = document.createElement('tr');
tr.appendChild(document.createElement('td'));
tr.appendChild(document.createElement('td'));
tr.cells[0].appendChild(document.createTextNode('John'))
tr.cells[1].appendChild(document.createTextNode('McDowell'))
table.appendChild(tr);
}
tablearea.appendChild(table);
}
DEMO

SOLUTION
function CreatTable() {
var tablearea = document.getElementById('ShowDataID');
var table = document.createElement('table');
var thead = document.createElement('thead');
var tr = document.createElement('tr');
var th = document.createElement('th');
var firstNameTxt = document.createTextNode("First Name");
th.appendChild(firstNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
var familyNameTxt = document.createTextNode("Family Name");
th = document.createElement('th');
th.appendChild(familyNameTxt);
tr.appendChild(th);
thead.appendChild(tr);
table.appendChild(thead);
for (var i = 1; i < 4; i++) {
tr = document.createElement('tr');
tr.appendChild(document.createElement('td'));
tr.appendChild(document.createElement('td'));
tr.cells[0].appendChild(document.createTextNode('John'));
tr.cells[1].appendChild(document.createTextNode('McDowell'));
table.appendChild(tr);
}
tablearea.appendChild(table);
}
CreatTable();

you miss creating new th
var familyNameTxt = document.createTextNode("Family Name");
th = document.createElement('th'); // this line missed
th.appendChild(familyNameTxt);

Create dynamic table row and remove on click delete button row. for this you can use jQuery two method
.append() this method used for append html table row, on button click of .add_row_record its get value from text box and append data on table row.
.remove () this method is used for remove dynamic content data, in this example we are used for delete append record. .delete_row_record button remove the record on the basis of selected checkbox.
<script type="text/javascript">
$(document).ready(function(){
//add row
$(".add_row_record").click(function(){
var name = $("#name").val();
var email = $("#email").val();
var mobile = $("#mobile_number").val();
var markup = "<tr><td><input type='checkbox' name='record'></td><td>" + name + "</td><td>" + email + "</td><td>" + mobile + "</td></tr>";
$("table tbody").append(markup);
});
// select record for delete
$(".delete_row_record").click(function(){
$("table tbody").find('input[name="record"]').each(function(){
if($(this).is(":checked")){
$(this).parents("tr").remove();
}
});
});
});
Demo