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Last edited by Taras Gaidukov
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A sample project

A sample project

A sample project for this tutorial will be a simple HTML page with two input fields and one button and a simple JS function that summarize number from input fields when button is clicked. The full code is available in the repository.

index.html

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>JS Frontend CI Tutorial</title>
    <script src="js/sum.js"></script>
    <script src="js/main.js"></script>
</head>
<body>
    <div>
        <label for="input_number_1">First number:</label>
        <input id="input_number_1"><br>

        <label for="input_number_2">Second number:</label>
        <input id="input_number_2"><br>

        <button id="sum_button">Sum</button>
    </div>
    
    <div>Result is: <span id="sum_result"></span></div>
</body>
</html>

js/sum.js

const sum = (a, b) => {
    return a + b;
};

js/main.js

document.addEventListener('DOMContentLoaded', () => {
    const btn =  document.querySelector('#sum_button');
    const input1 = document.querySelector('#input_number_1');
    const input2 = document.querySelector('#input_number_2');
    const result = document.querySelector('#sum_result');
    
    btn.addEventListener('click', () => {
        const num1 = parseInt(input1.value);
        const num2 = parseInt(input2.value);

        result.innerHTML = sum(num1, num2);
    });
});