JavaScript: Create a function to update the content of a specific cell of a table

Last update on April 13 2024 13:25:41 (UTC/GMT +8 hours)

JavaScript DOM: Exercise-6 with Solution

Write a JavaScript function that accepts a row, column (to identify a particular cell) and a string to update the cell's contents.

Sample HTML file:


<!DOCTYPE html>
<html><head>
<meta charset=utf-8 />
<title>Change the content of a cell</title>
</head><body>
<table id="myTable" border="1">
<tr><td>Row1 cell1</td>
<td>Row1 cell2</td></tr>
<tr><td>Row2 cell1</td>
<td>Row2 cell2</td></tr>
<tr><td>Row3 cell1</td>
<td>Row3 cell2</td></tr>
</table><form>
<input type="button" onclick="changeContent()" value="Change content">
</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>Change the content of a cell</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"> 
<!-- First row of the table -->
<tr><td>Row1 cell1</td> 
<td>Row1 cell2</td></tr> 
<!-- Second row of the table -->
<tr><td>Row2 cell1</td> 
<td>Row2 cell2</td></tr> 
<!-- Third row of the table -->
<tr><td>Row3 cell1</td> 
<td>Row3 cell2</td></tr> 
</table>
<!-- Form element containing a button triggering the changeContent function on click -->
<form> 
<input type="button" onclick="changeContent()" value="Change content"> 
</form>
<!-- End of body section -->
</body>
<!-- End of HTML document -->
</html>

JavaScript Code:

// Function declaration for changeContent
function changeContent()
{
    // Prompting the user to input the row number
    rn = window.prompt("Input the Row number(0,1,2)", "0");
    // Prompting the user to input the column number
    cn = window.prompt("Input the Column number(0,1)","0");
    // Prompting the user to input the cell content
    content = window.prompt("Input the Cell content");  
    // Getting reference to the cells in the specified row of the table
    var x=document.getElementById('myTable').rows[parseInt(rn,10)].cells;
    // Setting the inner HTML content of the specified cell
    x[parseInt(cn,10)].innerHTML=content;
}

Output:

Flowchart:

Live Demo:

See the Pen javascript-dom-exercise-6 by w3resource (@w3resource) on CodePen.

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