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validation Javascript problem

 
Greenhorn
Posts: 4
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hi masters of javascript! i have a little problem here. i want to apply a simple form validation on a textbox if the user failed to input any value upon clicking the submit button.

here's my code:

<html>

<head>
<script language= "javascript">
function sel(frm)
{
var pet = frm.chkSubj;
var a="<ul>";

for (i=0;i<pet.length;i++)
{
if(pet[i].checked)
{
a+="<li>"+pet[i].value+"</li>";

}
}
a+="</ul>";
a="Your Subject is/are : "+ a;

var courses = frm.cboCourse;
var idx = courses.selectedIndex;
var course = courses.options[idx].value;


var years=frm.optYear;
var ctrs;
var as;

for(ctrs=0;ctrs<years.length;ctrs++)
{
if(years[ctrs].checked)
{
as=years[ctrs].value;
break;
}
}
var nam = frm.txtname.value;

document.getElementById("name").innerHTML="Name : " + nam;
document.getElementById("subj").innerHTML= a;
document.getElementById("year").innerHTML="Year : " + as;
document.getElementById("course").innerHTML="Course : " + course;

}


</script>
</head>

<body>
<form>
Name:
<input type="text" name="txtname"/>
<br /><br />
Course:
<select name="cboCourse">
<option value="-1"></option>
<option value="BSCS">BSCS</option>
<option value="BSIT">BSIT</option>
<option value="ComEng">ComEng</option>
<option value="ComTech">ComTech</option>
<option value="ComSec">ComSec</option>
<option value="ACHT">ACHT</option>
</select>

<br /><br />
Year:
<input type="radio" value="First" name="optYear" checked="checked"/>I
<input type="radio" value="Second" name="optYear" />II
<input type="radio" value="Third" name="optYear" />III
<input type="radio" value="Fourth" name="optYear" />IV

<br /><br />
Subjects:
<br />
<input type="checkbox" value="CP1" name="chkSubj" />CP1
<input type="checkbox" value="DBMS" name="chkSubj" />DBMS
<br />
<input type="checkbox" value="CP2" name="chkSubj" />CP2
<input type="checkbox" value="WebProg" name="chkSubj" />WebProg
<br />
<input type="checkbox" value="CP3" name="chkSubj" />CP3
<input type="checkbox" value="IT Project I" name="chkSubj" />IT Project I
<br />
<input type="checkbox" value="CCF" name="chkSubj" />CCF
<input type="checkbox" value="IT Project II" name="chkSubj" />IT Project II


<br /><br />
<input type="button" value="Process" onclick="sel(this.form)" />
<input type="reset" value="Clear" onclick ="Delete"/>
</form>

<div id="name"></div>
<div id="course"></div>
<div id="year"></div>
<div id="subj"></div>

</body>

</html>


here's the sample output:




and here's the asterisk or input validation should be...




thank you for your help!
 
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.
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