JavaScript html web form

Question 1

Here is how to add radio validation to your code. (Note this is setup for name="group1" radios only, you will need a for loop to check group2, group3, etc.)

if (document.ExamEntry.group1.value=="") {
    msg+="You must choose a qualification\n";
    document.ExamEntry.subject.focus();
    document.getElementById('radioqual').style.color="red";
    result = false;
}

You notify the user of what qualification they clicked by onclick events on each radio.

The function

function qualinform(qualname) {
  alert(qualname + " was selected as your qualification.");
}

Example of a radio button (The name should be put into the onclick parameters)

<input onclick="qualinform('GCSE');" type="radio" name="group1" value="GCSE">GCSE

Here is the complete code.

<html>
<head>

<title>Exam Entry</title>

<script language="javascript" type="text/javascript">
function qualinform(qualname) {
  alert(qualname + " was selected as your qualification.");
}

function validateForm(e) {

var result = true;
var msg="";

if (document.ExamEntry.name.value=="") {
    msg+="You must enter your name \n";
    document.ExamEntry.name.focus();
    document.getElementById('name').style.color="red";
    result = false;
}

if (document.ExamEntry.subject.value=="") {
    msg+="You must enter the subject \n";
    document.ExamEntry.subject.focus();
    document.getElementById('subject').style.color="red";
    result = false;
}

if (document.ExamEntry.group1.value=="") {
    msg+="You must choose a qualification\n";
    document.ExamEntry.subject.focus();
    document.getElementById('radioqual').style.color="red";
    result = false;
}

var regex = /^\d{4}$/;
if (document.ExamEntry.Examination_number.value == "") {
msg+="You must enter your examination number";
result = false;
} else if (isNaN(document.ExamEntry.Examination_number.value)) {
msg+="Examination number should only contain digits";
result = false;
} else if (!regex.test(document.ExamEntry.Examination_number.value)) {
msg+="Examination number should contain exactly 4 digits";
result = false;
}

if (msg != "") {
    alert(msg);
}

return result;
}
</script>



</head>

<body>
<h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html" onsubmit="return     validateForm();">
<table width="60%" border="0">
    <tr>
        <td id="name">Name</td>
        <td><input type="text" name="name" /></td>
    </tr>
    <tr>
        <td id="subject">Subject</td>
        <td><input type="text" name="subject" /></td>
    </tr>
        <td id="Examination_number">Examination number</td>
        <td><input type="text" maxlength="4" name="Examination_number" /></td>
    </tr>
    <tr>
<td id="qualification">Choose your qualification</td>
<tr>
<td id="radioqual">
<input onclick="qualinform('GCSE');" type="radio" name="group1" value="GCSE">GCSE<br>
<input onclick="qualinform('AS');" type="radio" name="group1" value="AS">AS<br>
<input onclick="qualinform('A2');" type="radio" name="group1" value="A2">A2<br>
</td>
</tr>
    <tr>
        <td><input type="submit" name="Submit" value="Submit" /></td>
        <td><input type="reset" name="Reset" value="Reset" /></td>
    </tr>
</table>
</form>
</body>

</html>

Question 2

Loop over each of the form elements named 'qualification', and when you find the checked one, grab its value and push it into your validation message like this:

var qualifications = document.getElementsByName('group1') 

for (var i = 0, length = qualifications.length; i < length; i++) {
    if (radios[i].checked) {
        msg+='you have selected ' + radios[i].value + ' as your qualification.';
        break;
    }
}

Question 3

Okay I have a solution for you :) Try this

Then allocate ids to your inputs as a1, a2 & a3

<script language="javascript" type="text/javascript">

function validateForm(e) {

var result = true;
var msg="";

if (document.ExamEntry.name.value=="") {
msg+="You must enter your name \n";
document.ExamEntry.name.focus();
document.getElementById('name').style.color="red";
result = false;
}

if (document.ExamEntry.subject.value=="") {
msg+="You must enter the subject \n";
document.ExamEntry.subject.focus();
document.getElementById('subject').style.color="red";
result = false;
}

var regex = /^\d{4}$/;
if (document.ExamEntry.Examination_number.value == "") {
msg+="You must enter your examination number";
result = false;
} else if (isNaN(document.ExamEntry.Examination_number.value)) {
msg+="Examination number should only contain digits";
result = false;
} else if (!regex.test(document.ExamEntry.Examination_number.value)) {
msg+="Examination number should contain exactly 4 digits";
result = false;
}

if(document.getElementById('a1').checked){
    if (msg != "") {
    alert(msg);
    }

    return result;  
}
else{
    if(document.getElementById('a2').checked){
        if (msg != "") {
        alert(msg);
        }

        return result;   
    }
    else{
        if(document.getElementById('a3').checked){
             if (msg != "") {
             alert(msg);
             }

             return result;   
        }
        else{
            msg+="Please select an option";
            result = false;
            if (msg != "") {
            alert(msg);
            }

            return result;
        }   
    }      
}


}
</script>