Table of Contents

Multiplication Table Generator

For client side (web browser)

This is a simple script to print a multiplication table generator using simple java script and html.
Output example:

All code js + html in the same file

index.html
<!DOCTYPE html>
<html>
    <head>
        <script>
 
            function createMultiplicationTable(rows, columns) {
                let html = '<table>';
 
                for(let rowNumber = 1; rowNumber <= rows; rowNumber++) {
                    html = html + '<tr>';
 
                    for(let columnNumber = 1; columnNumber <= columns; columnNumber++) {
                        html = html + `<td>${rowNumber * columnNumber}</td>`;
                    }
 
                    html = html + '</tr>';
                }
 
 
                html = html + '</table>';
                return html;
            } 
 
            function onGeneratePressed() {
                let rowsInput = document.getElementById("rows-input").value;
                let columnsInput = document.getElementById("columns-input").value;
 
                let rows = Number(rowsInput);
                let columns = Number(columnsInput);
 
                if (isNaN(rows) || isNaN(columns)) {
                    alert("Invalid input! Please enter numbers only.");
                    return;
                }
 
                let tableHTML = createMultiplicationTable(rows, columns);
 
                document.getElementById("table-container").innerHTML = tableHTML;
            }
        </script>
    </head>
    <body>
        <h1>Multiplication Table Generator</h1>
        <label>
            Number of rows: <input id = "rows-input" type="text">
        </label>
        <label>
            Number of columns: <input id = "columns-input" type="text">
        </label>
        <button onclick="onGeneratePressed()">Generate</button>
        <div id="table-container"></div>
    </body>
</html>

Js code separated from html code

index.html
<!DOCTYPE html>
<html>
    <head>
        <script src="generateTable.js"></script>
    </head>
    <body>
        <h1>Multiplication Table Generator</h1>
        <label>
            Number of rows: <input id = "rows-input" type="text">
        </label>
        <label>
            Number of columns: <input id = "columns-input" type="text">
        </label>
        <button onclick="onGeneratePressed()">Generate</button>
        <div id="table-container"></div>
    </body>
</html>
generateTable.js
function createMultiplicationTable(rows, columns) {
    let html = '<table>';
 
    for(let rowNumber = 1; rowNumber <= rows; rowNumber++) {
        html = html + '<tr>';
 
        for(let columnNumber = 1; columnNumber <= columns; columnNumber++) {
            html = html + `<td>${rowNumber * columnNumber}</td>`;
        }
 
        html = html + '</tr>';
    }
 
 
    html = html + '</table>';
    return html;
} 
 
function onGeneratePressed() {
    let rowsInput = document.getElementById("rows-input").value;
    let columnsInput = document.getElementById("columns-input").value;
 
    let rows = Number(rowsInput);
    let columns = Number(columnsInput);
 
    if (isNaN(rows) || isNaN(columns)) {
        alert("Invalid input! Please enter numbers only.");
        return;
    }
 
    let tableHTML = createMultiplicationTable(rows, columns);
 
    document.getElementById("table-container").innerHTML = tableHTML;
}

For server side (node.js)

First you need to setup your node.js project

Then create a src folder and inside it place index.js and generateTable.js:

generateTable.js
export function createMultiplicationTable(rows, columns) {
    let tableString = '';
 
    for(let rowNumber = 1; rowNumber <= rows; rowNumber++) {
        for(let columnNumber = 1; columnNumber <= columns; columnNumber++) {
            tableString = tableString + ` ${rowNumber * columnNumber} `;
        }
        tableString = tableString + '\n';     
    }
 
    return tableString;
}
index.js
import { createMultiplicationTable } from "./generateTable.js";
 
let args = process.argv.slice(2);
 
let rowsInput = args[0];
let columnsInput = args[1];
 
let rows = Number(rowsInput);
let columns = Number(columnsInput);
 
if (isNaN(rows) || isNaN(columns)) {
    console.log("Invalid input! Please enter numbers only.");
}
else {
    let tableString = createMultiplicationTable(rows, columns);
    console.log(tableString);
}

To run the code, from the project root folder: 

node src/index.js 5 5

Will output in the console: 

1  2  3  4  5     
2  4  6  8  10    
3  6  9  12  15   
4  8  12  16  20  
5  10  15  20  25