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              <html>
<body>

<h1>Τι μπορούμε να κάνουμε με την JavaScript;</h1>
<h2 id="test">Αλλαγή HTML</h2>
<button type="button" onclick="document.getElementById('test').innerHTML = 'Γεια σου κόσμε, είμαι η Javascript!'"> Click Me!</button>
<hr>
 <h1>Με την JavaScript μπορούμε να αλλάξουμε εικόνες</h1>
 <h2>Κάντε Click στην λάμπα.</h2>
<img id="myImage" onclick="changeImage()" src="http://infolesson.com/wp-content/uploads/2016/10/lamp-white.png" width="300" height="480">
<hr>
<h2 id="changeme">Με την JavaScript μπορούμε να αλλάξουμε το style ενός HTML στοιχείου.</h2>
<button type="button" onclick="Function1()">Click Me!</button>
<hr>
<h1>Με την JavaScript μπορούμε να επικυρώσουμε δεδομένα.</h1>
<h2>Δώσε έναν αριθμό απο το 1 μέχρι το 10:</p>
<input id="giveme">
<button type="button" onclick="Function2()">Submit</button>
<p id="showme"></p>
<hr>

  




 

</body>
</html>

            
          
!
            
              function changeImage() {
    var image = document.getElementById('myImage');
    if (image.src.match("yellow")) {
        image.src = "http://infolesson.com/wp-content/uploads/2016/10/lamp-white.png";
    } else {
        image.src = "http://infolesson.com/wp-content/uploads/2016/10/lamp-yellow.png";
    }
}

function Function1() {
    var x = document.getElementById("changeme");
    x.style.fontSize = "40px";           
    x.style.color = "red"; 
}

function Function2() {
    var x, text;
    x = document.getElementById("giveme").value;
    if (isNaN(x) || x < 1 || x > 10) {
        text = "Λάθος δεδομένα";
    } else {
        text = "ΟΚ";
    }
    document.getElementById("showme").innerHTML = text;
}

            
          
!
999px
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