validate checkbox

[necta]

How do I validate dynamic checkbox whether it is selected? How I get the name of the dynamic checkbox name?
Thank you.

<script language=javascript>
//----------
// require that at least one checkbox be checked
var selected = false;
for (i = 0; i < theForm.frmNo.length; i++)
{
if (theForm.form.checked)
selected = true;
}
if (!selected)
{
alert("Please choose a field.");
return (false);
}
}
//-->
</script>

While Not RS.EOF

<form name--------- >
<Input type=”checkbox” name=form<%=frmNo%> value="<%=RS("ID")%>"”>

RS.Movenext

Wend

 

[simonchristieis]

try this

function checkone(f){
var value = false
    for (i=0;i<f.elements.length;i++)
        if (f.elements[i].name.indexOf('form') !=-1)
            if(f.elements[i].checked == true)
               value = f.elements[i].checked;

return value;
}

and

<form name--------- onsubmit="return checkone(this)" >
While Not RS.EOF

<Input type=”checkbox” name=form<%=frmNo%>  value="<%=RS("ID")%>"”>

RS.Movenext

hth

simon

 

[necta]

Thank for the tips, simon, u giving me the hints to validate the checkbox fields but when i tried it on dynamic checkbox, it did not work. The error "textfields.length not an object" I tried on marks.length, it also gave the same error.What have I done wrong? I used on blur to validate each field. The 'elements' work in checkbox but not here.

Necta

<!--
function numValidate(mrk)
{
var mrk;

for (i = 0; i < mrk.textfields.length; i++)
{
// check to see if the number field is blank
if (mrk.textfields.value == "")
{
alert("Please enter a number.");
mrk.textfields.focus();
return (false);
}
}
}
//-->
</script>


Do While NOT sRS.EOF
subjNo=subjNo+1
%>

<
<input type="text" name="marks<%=subjNo%>" id="marks<%=subjNo%>" type="text" size="4" value="<%=subjNo%>" maxlength="3" onblur="return numValidate(this)">


<%
sRS.moveNext
Loop

 

[simonchristieis]

What are you trying to do - in the first post you mention checkboxes, which is the what my function will validate, then you repost changing my function and changing checkboxes to text fields?

whats this?

for (i = 0; i < mrk.textfields.length; i++)

this is where your errors lie.

are you trying to validate text or checkbox or both, please be clear.

Simon

 

[necta]

Sorry for the mistake. I intend to validate text field which carry the numeric input. However I have successfully validate using If (mrk.value ==""). But now the problem is how to validate the input which is a numeric input (include of -1)

 

[simonchristieis]

simple - try and make your posts clearer in future

function checkone(f){
var value = true
    for (i=0;i<f.elements.length;i++)
        if (f.elements[i].name.indexOf('form') !=-1)
            if((isNaN(f.elements[i].value)) || (f.elements[i].value == null) || (f.elements[i].value.length == 0))
               value = false;

return value;
}

hth

simon