Making Sure Checkboxes Are Checked

tomyknoker · 09-03-2007, 08:50 AM

I have 3 checkboxes in a form... The 1st checkbox can only be checked if the 3rd checkbox has also been checked... So basically checkbox1 or 2 HAS to be checked, but 1 can ONLY be checked if 3 is checked... Whoa confuse much!

I have the following JavaScript it's from a much larger part of a form I am doing so need to edit it to fit... At the moment obvioulsy it only is checking if one is checked... Any ideas would be greatly appreciated!

Code:

if(!(from.checkbox1.checked || form.checkbox2.checked || form.checkbox3.checked))
    {
      theMessage = theMessage + "\n --> Please select a checkbox";
    }

Fang · 09-03-2007, 09:11 AM

Code:

if(!(form.checkbox1.checked  && form.checkbox3.checked) && !form.checkbox2.checked)
    {
      theMessage = theMessage + "\n --> Please select a checkbox";
    }

Note your typo from.checkbox1.checked

tomyknoker · 09-03-2007, 09:52 AM

Hey that worked perfectly! Is it possible to change it slightly so that checkbox 3 can be selected, and the form posted? checkbox 1 is the only checkbox that needs to have 3 checked also but 3 can be checked by itself if that makes sense?

Fang · 09-03-2007, 10:29 AM

Code:

if(!(form.checkbox1.checked  && form.checkbox3.checked) && !form.checkbox3.checked && !form.checkbox2.checked)
    {
      theMessage = theMessage + "\n --> Please select a checkbox";
    }

tomyknoker · 09-04-2007, 05:39 AM

Hi Fang... Thanks again... When I ran it again I realised I had to change a few things, but not even sure if it's possible... Ok for the checkboxes I changed it to this...

Code:

if(!(form.checkbox2.checked && form.checkbox3.checked) && !form.checkbox1.checked)
    {
      theMessage = theMessage + "\n --> Please choose the appropriate checkbox!";
    }

So now it says that checkbox 2 & 3 need to be selected together or checkbox 1 can be selected by itself... Further down the form I have a gender select radio button, but I realised this only needs to be selected if checkbox 2 & 3 are selected, is there anyway to combine this?

Code:

myGender = -1;
for (i=form.radio2.length-1; i > -1; i--) {
if (form.radio2[i].checked) {
myGender = i; i = -1;
}
}
if (myGender == -1) {
theMessage = theMessage + "\n --> You selected checkbox 2 & 3, so you must select your gender";
}

Fang · 09-04-2007, 08:43 AM

Code:

if((form.checkbox2.checked && form.checkbox3.checked) && !form.radio2[0].checked && !form.radio2[1].checked) {
theMessage = theMessage + "\n --> You selected checkbox 2 & 3, so you must select your gender";
}

Consider hiding gender radios until checkbox 2 & 3 have been selected.
It's a little more work, but clearer for the user what needs to be selected.