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Making a checkbox a required field.

Posted on 2002-06-11
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Medium Priority
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Last Modified: 2010-04-09
I would like to know if there is a way to make a checkbox on a form a required field. I know that normally a checkbox is used to pick an option/selection but I would like to use it as a way to control accountability.

i.e. By selecting this box you agree to XXX....

Thank you,
seamil
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Question by:seamil
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6 Comments
 
LVL 33

Expert Comment

by:knightEknight
ID: 7071248
<FORM name='myform' action='whatever' method='post'
   onSubmit='return this.mycheckbox.checked;'>

  <INPUT type='checkbox' name='mycheckbox'>

</form>
0
 
LVL 33

Expert Comment

by:knightEknight
ID: 7071250
the above code will prevent the form from submitting if the checkbox is not checked.
0
 
LVL 33

Expert Comment

by:knightEknight
ID: 7071257
also, you may want to present a message:

<SCRIPT language='javascript'>
 function validate(theForm)
 {
    var c = theForm.mycheckbox.checked;
    if ( c == false ) alert("you must check the box!");
    return c;
 }
</script>


<FORM name='myform' action='whatever.asp' method='post'
      onSubmit='return validate(this);'>

  <INPUT type='checkbox' name='mycheckbox'>

</form>
0
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Author Comment

by:seamil
ID: 7071316
knightEknight,

The onSubmit works fine but I can not get the message to appear with the script you provided.

I modified the (theForm) to match the name I gave my form and mycheckbox to match the name of my checkbox but no message appears.

seamil
0
 
LVL 33

Accepted Solution

by:
knightEknight earned 400 total points
ID: 7071326
you can call it whatever you want inside the function as long as you pass a reference to the form when you call the function.  So you can do this:

    function validate(theForm)

and use "theForm" in the function, as long as you do this in the form tag:

    onSubmit='return validate(this);'>

which is another way of doing this:

    onSubmit='return validate(document.formname);'>

If you still have problems, post your code and I will look it over.

0
 

Author Comment

by:seamil
ID: 7071355
It works!

Thank you very much!

Seamil
0

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