JavaScript: Create a user defined table, accepting rows and columns

Last update on July 18 2025 12:59:17 (UTC/GMT +8 hours)

JavaScript DOM: Exercise-7 with Solution

Create Table Dynamically

Write a JavaScript function to create a table, accept row and column numbers, and input row-column numbers as cell content (e.g. Row-0 Column-0).

Sample HTML file:


<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Change the content of a cell</title>
<style type="text/css">
body {margin: 30px;}
</style>  
</head><body>
<table id="myTable" border="1">
</table><form>
<input type="button" onclick="createTable()" value="Create the table">
</form></body></html>

Sample Solution:

HTML Code:

<!-- Declaration of HTML document type -->
<!DOCTYPE html> 
<!-- Start of HTML document -->
<html> 
<!-- Start of head section -->
<head> 
<!-- Declaring character encoding -->
<meta charset=utf-8 /> 
<!-- Setting title of the document -->
<title>Create a table</title> 
<!-- Internal CSS styling -->
<style type="text/css"> 
    /* Styling body to have margin of 30px */
    body {margin: 30px;} 
</style>  
<!-- End of head section -->
</head>
<!-- Start of body section -->
<body> 
<!-- Table element with id 'myTable' and border attribute -->
<table id="myTable" border="1"> 
<!-- End of table element, currently empty -->
</table>
<!-- Form element containing a button triggering the createTable function on click -->
<form> 
<input type="button" onclick="createTable()" value="Create the table"> 
</form>
<!-- End of body section -->
</body>
<!-- End of HTML document -->
</html>

JavaScript Code:

// Function declaration for createTable
function createTable()
{
    // Prompting the user to input the number of rows
    rn = window.prompt("Input number of rows", 1);
    // Prompting the user to input the number of columns
    cn = window.prompt("Input number of columns",1);
  
    // Looping through rows
    for(var r=0;r<parseInt(rn,10);r++)
    {
        // Inserting a new row at index r in the table
        var x=document.getElementById('myTable').insertRow(r);
        // Looping through columns
        for(var c=0;c<parseInt(cn,10);c++)  
        {
            // Inserting a new cell at index c in the current row
            var y=  x.insertCell(c);
            // Setting the inner HTML content of the cell
            y.innerHTML="Row-"+r+" Column-"+c; 
        }
    }
}

Output:

Flowchart:

Live Demo:

See the Pen javascript-dom-exercise-7 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

Write a JavaScript function that creates a table with a user-specified number of rows and columns, filling each cell with its coordinates (e.g., "Row-0 Column-0").
Write a JavaScript function that generates a table where each cell displays a random number, and appends it to the document body.
Write a JavaScript function that builds a table dynamically and applies inline styles to each cell for visual formatting.
Write a JavaScript function that creates a table from a two-dimensional array and renders it on the webpage.

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