Question

I asked this question in an interview. In asp.net how can we check the no. of checked boxes using javascript.

Answer 1

By using jquery you can get the number of checkboxes on a html page by this

alert($('input:checkbox').length);

Or by using the following jquery code to determine the complete picture

var totalNoOfChkBoxes = 0;
var NoOfCheckedchkBoxes = 0;
var NoOfUnCheckedChkBoxes = 0;
$('input:checkbox').each(function () {
  if ($(this).is(':checkbox')) {
    totalNoOfChkBoxes += 1;
    if($(this).attr('value') == "on")
      NoOfCheckedchkBoxes += 1;
    else
      NoOfUnCheckedChkBoxes += 1;
   }
});
alert(totalNoOfChkBoxes);
alert(NoOfCheckedchkBoxes);
alert(NoOfUnCheckedChkBoxes);