jQuery see if any or no checkboxes are selected

I know how to see if an individual checkbox is selected or not.

But Im having trouble with the following - given a form id I need to see if any of the checkboxes are selected (i.e 1 or more), and I need to see if none are selected. Basically I need two separate functions that answer these two questions. Help would be appreciated. Thanks!

Actually, I would just need a function to tell me if none are selected. Knowing this would answer the other question.

Solution 1:

You can use something like this

if ($("#formID input:checkbox:checked").length > 0)
{
    // any one is checked
}
else
{
   // none is checked
}

Solution 2:

JQuery .is will test all specified elements and return true if at least one of them matches selector:

if ($(":checkbox[name='choices']", form).is(":checked"))
{
    // one or more checked
}
else
{
    // nothing checked
}

Solution 3:

You can do this:

  if ($('#form_id :checkbox:checked').length > 0){
    // one or more checkboxes are checked
  }
  else{
   // no checkboxes are checked
  }

Where:

• :checkbox filter selector selects all checkbox.
• :checked will select checked checkboxes
• length will give the number of checked ones there