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Posted on 1998-06-29
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Last Modified: 2011-09-20
Is it possible to set a maximum number of checkboxes checked in a form ?

I have 10 answers but i don't want the user to check more than 4 ! there should be some kind of alert " you cannot check more than 4 boxes" or something like that !
is that possible ? if so .. HOW ??
thanks ...
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Question by:BlackSun
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2 Comments
 

Author Comment

by:BlackSun
ID: 1844435
Edited text of question
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Accepted Solution

by:
sybe earned 240 total points
ID: 1844436
<script>
var BoxesChecked = 0;
function CheckTotalNumber(name) {
      if (BoxesChecked < 4 && name.checked) {
            BoxesChecked = BoxesChecked + 1;
      } else if (name.checked) {
            alert("You can only check 4 items");
            name.checked = false;
      } else if (!name.checked) {
            BoxesChecked = BoxesChecked - 1;
      }
}
</script>



<form>
<INPUT type=checkbox name="checkbox1" onClick="CheckTotalNumber(this)"> checkbox1
<br>
<INPUT type=checkbox name="checkbox2" onClick="CheckTotalNumber(this)"> checkbox2
<br>
<INPUT type=checkbox name="checkbox3" onClick="CheckTotalNumber(this)"> checkbox3
<br>
<INPUT type=checkbox name="checkbox4" onClick="CheckTotalNumber(this)"> checkbox4
<br>
<INPUT type=checkbox name="checkbox5" onClick="CheckTotalNumber(this)"> checkbox5
<br>
<INPUT type=checkbox name="checkbox6" onClick="CheckTotalNumber(this)"> checkbox6
<br>
<INPUT type=checkbox name="checkbox7" onClick="CheckTotalNumber(this)"> checkbox7
<br>
<INPUT type=checkbox name="checkbox8" onClick="CheckTotalNumber(this)"> checkbox8
<br>
<INPUT type=checkbox name="checkbox9" onClick="CheckTotalNumber(this)"> checkbox9
<br>
<INPUT type=checkbox name="checkbox10" onClick="CheckTotalNumber(this)"> checkbox10
<br>
</form>



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