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JavaScript exercises with solution for Basic JavaScript training course

List of java script exercises with solution for Java Basic training course.

The numbering of the exercise is indicative of the level of difficulty, from the simplest to the most complicated. If you have any comments, questions or suggestions: write to us at info @bloginnovazione.it

Exercise 1: Write an html page containing a paragraph with the sentence:

Anything that can go wrong will go wrong

with javascript trigger some events:

– onclick : set bold for the text and yellow for the background
– onmouseover : set underlined for the text and orange for the background
– onmouseout : set 16px font for the text and light blue for the background

<!DOCTYPE html>
<html lang="en">


<head>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script>
  function onMouseClick() {
     document.getElementById("parag").style.fontWeight = "bold";
     document.getElementById("parag").style.backgroundColor = "yellow";
   }
   function onMouseOverEvent() {
     document.getElementById("parag").style.textDecoration = "underline";
     document.getElementById("parag").style.backgroundColor = "orange";
   }
   function onMouseOutEvent() {
     document.getElementById("parag").style.fontSize = "16px";
     document.getElementById("parag").style.backgroundColor = "lightblue";
   }
    </script>
</head>

<body>
    <p id="parag" >

Exercise 2: Writing an html page with four elements arranged on three lines in the center of the page (horizontally)

– in the first row two input text side by side and spaced apart
– in the second row a button with the '+' operator, when you click on the button (onclick event) you must read the two input fields of the first row, add them and write the result in the paragraph of the third row
– in the third line a paragraph

write the js code in an external file to import into the html via src to insert in the section

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<style>
input {
    margin: 20px;
    margin-bottom: 30px;
}
.box-1 {
    display: flex; 
    justify-content: center; 
    align-items: center;
}
.box {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-bottom: 50px;
}
button {
    padding: 5px;
    width: 75px;
}
.container{
    margin: 250px;
}
</style>
<script>
function onClick() {
    let num1 = document.getElementById("num1").value;
    let num2 = document.getElementById("num2").value;
    let result;
    if (!isNaN(num1) && !isNaN(num2)) {
        result = parseFloat(num1) + parseFloat(num2);
    } else {
        result = num1 + num2;
    }
    document.getElementById("result").innerHTML = result;
}
</script>
</head>
<body>
<div class="container">
    <div class="box-1">
        <input id="num1" type="text" placeholder="Insert num or text . . .">  
        <input id="num2" type="text" placeholder="Insert num or text . . .">
    </div>
    <div class="box">
        <button  >

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