Korištenje praktičnih primjera koda JavaScript

Primjer br. 1: JavaTablica množenja skripte

Napravite jednostavnu tablicu množenja pitajući korisnika koji broj redaka i stupaca želi.

Rješenje:

<html>
<head>
  <title>Multiplication Table</title>
  <script type="text/javascript">
    var rows = prompt("How many rows for your multiplication table?");
    var cols = prompt("How many columns for your multiplication table?");
    if(rows == "" || rows == null)
   		 rows = 10;
    if(cols== "" || cols== null)
   		 cols = 10;
    createTable(rows, cols);
    function createTable(rows, cols)
    {
      var j=1;
      var output = "<table border='1' width='500' cellspacing='0'cellpadding='5'>";
      for(i=1;i<=rows;i++)
      {
    	output = output + "<tr>";
        while(j<=cols)
        {
  		  output = output + "<td>" + i*j + "</td>";
   		  j = j+1;
   		}
   		 output = output + "</tr>";
   		 j = 1;
    }
    output = output + "</table>";
    document.write(output);
    }
  </script>
</head>
<body>
</body>
</html>

Primjer#2: Primjer JS obrazaca:

Napravite ogledni obrazac programa koji prikuplja ime, prezime, e-mail, korisnički ID, lozinku i potvrdu lozinke od korisnika. Svi unosi su obavezni, a unesena adresa e-pošte mora biti u ispravnom formatu. Također, vrijednosti unesene u tekstualne okvire za lozinku i potvrdu zaporke trebaju biti iste. Nakon provjere korištenja JavaScript, U izlazu prikazuju odgovarajuće poruke o pogrešci u crvenoj boji odmah pored tekstnog okvira u kojem postoji pogreška.

Rješenje s izvornim kodom:

<html>
<head>
  <title>Form Validation</title>
  <script type="text/javascript">
    var divs = new Array();
    divs[0] = "errFirst";
    divs[1] = "errLast";
    divs[2] = "errEmail";
    divs[3] = "errUid";
    divs[4] = "errPassword";
    divs[5] = "errConfirm";
    function validate()
	{
      var inputs = new Array();
      inputs[0] = document.getElementById('first').value;
      inputs[1] = document.getElementById('last').value;
      inputs[2] = document.getElementById('email').value;
      inputs[3] = document.getElementById('uid').value;
      inputs[4] = document.getElementById('password').value;
      inputs[5] = document.getElementById('confirm').value;
      var errors = new Array();
      errors[0] = "<span style='color:red'>Please enter your first name!</span>";
      errors[1] = "<span style='color:red'>Please enter your last name!</span>";
      errors[2] = "<span style='color:red'>Please enter your email!</span>";
      errors[3] = "<span style='color:red'>Please enter your user id!</span>";
      errors[4] = "<span style='color:red'>Please enter your password!</span>";
      errors[5] = "<span style='color:red'>Please confirm your password!</span>";
      for (i in inputs)
      {
        var errMessage = errors[i];
        var div = divs[i];
        if (inputs[i] == "")
        	document.getElementById(div).innerHTML = errMessage;
        else if (i==2)
        {
          var atpos=inputs[i].indexOf("@");
          var dotpos=inputs[i].lastIndexOf(".");
          if (atpos<1 || dotpos<atpos+2 || dotpos+2>=inputs[i].length)
        	document.getElementById('errEmail').innerHTML = "<span style='color: red'>Enter a valid email address!</span>";
          else
        	document.getElementById(div).innerHTML = "OK!";
        }
        else if (i==5)
        {
          var first = document.getElementById('password').value;
          var second = document.getElementById('confirm').value;
          if (second != first)
        	document.getElementById('errConfirm').innerHTML = "<span style='color: red'>Your passwords don't match!</span>";
          else
       		document.getElementById(div).innerHTML = "OK!";
        }
        else
        	document.getElementById(div).innerHTML = "OK!";
       }
     }
        function finalValidate()
        {
          var count = 0;
          for(i=0;i<6;i++)
          {
            var div = divs[i];
            if(document.getElementById(div).innerHTML == "OK!")
            count = count + 1;
          }
          if(count == 6)
          	document.getElementById("errFinal").innerHTML = "All the data you entered is correct!!!";
        }
   </script>
</head>
<body>
	<table id="table1">
      <tr>
        <td>First Name:</td>
        <td><input type="text" id="first" onkeyup="validate();" /></td>
        <td><div id="errFirst"></div></td>
      </tr>
      <tr>
        <td>Last Name:</td>
        <td><input type="text" id="last" onkeyup="validate();"/></td>
        <td><div id="errLast"></div></td>
      </tr>
      <tr>
        <td>Email:</td>
        <td><input type="text" id="email" onkeyup="validate();"/></td>
        <td><div id="errEmail"></div></td>
      </tr>
      <tr>
        <td>User Id:</td>
        <td><input type="text" id="uid" onkeyup="validate();"/></td>
        <td><div id="errUid"></div></td>
      </tr>
      <tr>
        <td>Password:</td>
        <td><input type="password" id="password" onkeyup="validate();"/></td>
        <td><div id="errPassword"></div></td>
      </tr>
      <tr>
        <td>Confirm Password:</td>
        <td><input type="password" id="confirm" onkeyup="validate();"/></td>
        <td><div id="errConfirm"></div></td>
      </tr>
      <tr>
        <td><input type="button" id="create" value="Create" onclick="validate();finalValidate();"/></td>
        <td><div id="errFinal"></div></td>
      </tr>
	</table>
</body>
</html>

Primjer#3: POPUP poruka koja koristi događaj:

Prikaži jednostavnu poruku "Dobro došli!!!" na vašoj demo web stranici i kada korisnik prijeđe pokazivačem iznad poruke, trebao bi se prikazati skočni prozor s porukom "Dobrodošli na moju web stranicu!!!".

Rješenje:

<html>
    <head>
        <title>Event!!!</title>
        <script type="text/javascript">
            function trigger() {
                document.getElementById("hover").addEventListener("mouseover", popup);
                function popup() {
                    alert("Welcome to my WebPage!!!");
                }
            }
        </script>
        <style>
            p{
                font-size: 50px;
                position: fixed;
                left: 550px;
                top: 300px;
            }
        </style>
    </head>
    <body onload="trigger();">
        <p id="hover">Welcome!!!</p>
    </body>
</html>