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

Last update on May 30 2022 10:02:09 (UTC/GMT +8 hours)

JavaScript DOM: Exercise-7 with Solution

Write a JavaScript function that creates a table, accept row, column numbers from the user, and input row-column number as content (e.g. Row-0 Column-0) of a cell.

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:

<!DOCTYPE html> 
<html> 
<head> 
<meta charset=utf-8 /> 
<title>Create a table</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>

JavaScript Code:

function createTable()
{
rn = window.prompt("Input number of rows", 1);
cn = window.prompt("Input number of columns",1);
  
 for(var r=0;r<parseInt(rn,10);r++)
  {
   var x=document.getElementById('myTable').insertRow(r);
   for(var c=0;c<parseInt(cn,10);c++)  
    {
     var y=  x.insertCell(c);
     y.innerHTML="Row-"+r+" Column-"+c; 
    }
   }
}

Sample Output:

Flowchart:

Live Demo:

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

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04