Iterate through each checkboxes within SPFieldMultiChoice field in SP 2010 List newform.aspx and Validate

Question

I need to iterate through the all the check boxes within my SPFieldMultiChoice and check whether at least any one of the checkboxes are checked and if not checked, I need to return false.
I have this field created in my newform.aspx in my presaveaction call. I tried with the below code , but it didn't work:

  if ($('input:checkbox:checked').length == 0) 
  { 
    alert('Enter at least one checkbox.');
  } 
 else
  {
  } 

Also below code also doesn't work.

   var count = $('#checkboxes input:checked').length;

I was trying to get the ID of the SPFieldMultiChoice field but,in the F12 Dev Console, am unable to see an ID for this control specifically.It's splitted into all the checkbox IDs, instead

Answer 1

I would do it like this:

if ($("input[type='checkbox']:checked").length == 0) 
  { 
    alert('Enter at least one checkbox.');
  } 
 else
  {
  }