Reputation:

Explain a few part of the code

I need somebody to explain how the code below resets the radio buttons to blank when you click "reset" at the bottom of the webpage

Any help would be appriciated, i am fairly new to javascript and HTML

here is a fiddle with it in - http://jsfiddle.net/jamiepollard28/sDLV4/8/

<html>
<head>
<title>Exam entry</title>
<script language="javascript" type="text/javascript">
window.onload=function(){
window.validateForm=function() {
    var result = true;
    var msg = "";
    var focusname="";
    if (document.ExamEntry.name.value == "") {
        msg += "You must enter your name \n";
        focusname="name";
        //document.ExamEntry.name.focus();
        document.getElementById('name1').style.color = "red";
        //result = false;
    }
    if (document.ExamEntry.subject.value == "") {
        msg += "You must enter the subject \n";
       // document.ExamEntry.subject.focus();
        if (focusname=="")
        {
        focusname="subject";
        }
        document.getElementById('subject1').style.color = "red";
        //result = false;
    }
    var Number = document.ExamEntry.Exam_Number.value
    if (Number == "") {
        msg += "You must enter the exam Number \n";
        //document.ExamEntry.Exam_Number.focus();
        if (focusname=="")
        {
        focusname="Exam_Number";
        }
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }else if (Number.length != 4) {
        msg += "You must enter at least Four Numbers in the Exam Number \n";
         if (focusname=="")
        {
        focusname="Exam_Number";
        }
        //document.ExamEntry.Exam_Number.focus();
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }
else if (isNaN(Number)) {
        msg += "You must enter at least four numeric characters in the Exam Number feild \n";
     if (focusname=="")
        {
        focusname="Exam_Number";
        }   
    // document.ExamEntry.Exam_Number.focus();
        document.getElementById('Exam_Number1').style.color = "red";
        //result = false;
    }
    var valchecked = '';
    var len = document.getElementsByName('examtype').length;

    for (i = 0; i < len; i++) {

if ( document.ExamEntry.examtype[i].checked ) {

valchecked = document.ExamEntry.examtype[i].value;
 break;

}

}
    if (valchecked == '') {
        msg += "Select Exam Type";
        document.getElementById('Exam_Type').style.color = "red";
         if (focusname=="")
        {
        focusname="examtype_GCSE";
        }

    } 

    if (msg != ""){
        alert(msg)
        document.getElementById(focusname).focus();
        return false;
    }else{
        return confirm('You have chosen ' + valchecked + ' is this correct?');
    }

}
}//]]>  

</script>


</head>
<body>
  <h1>Exam Entry Form</h1>
<form name="ExamEntry" method="post" action="success.html">
<table width="50%" border="0">
<tr>
<td id="name1">Name</td>
<td><input type="text" name="name"  id="name" /></td>
</tr>
<tr>
<td id="subject1">Subject</td>
<td><input type="text" name="subject" id="subject"/></td>
</tr>
<tr>
<td id="Exam_Number1">Exam Number</td>
<td><input type="text" name="Exam_Number" id="Exam_Number" ><font size="3">(Maximum characters: 4)</font> </td>
</tr>
<tr>

<table><form action="">
<td id="Exam_Type">Exam Type</td>
<tr><td><input type="radio" id="examtype_GCSE" name="examtype" value="GCSE" /> : GCSE<br /></tr>
<tr><td><input type="radio" id="examtype_AS" name="examtype" value="AS"/> : AS<br /></tr>
<tr><td><input type="radio" id="examtype_A2" name="examtype" value="A2" /> : A2<br /></tr>
<tr><td><input type="submit" name="Submit" value="Submit" onclick="return validateForm();" /></td>
<td><input type="reset" name="Reset" value="Reset" /></td>
</tr>
</table>
</form>

</body>


</html>

Upvotes: 0

Answers (5)

NDK

Reputation: 1

The Reset object represents a reset button in an HTML form.

Clicking on a reset button resets all controls within the form to their default values.

For each tag in an HTML form, a Reset object is created.

Clicking on a reset button fires the onreset event!

Upvotes: -1

Divya

Reputation: 1487

the property of reset button is to set all the value to blank as you made at time of the creation of page .it does not contain the values filled at the time of filling of form by the user,and in the case of a radio button, if you put any parameter like checked /unchecked then it will reset it to that condition.