getNumBoxesChecked Javascript Function

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This function returns the number of selected checkboxes in a form. It is particularly useful for form validation, when the user is manditated to select at least x number of checkboxes.


Webpage Select

function getNumBoxesChecked(){
  var total = 0;
  var checkboxes_name = 'webpage[]';

  var checkboxes = document.Form.elements[checkboxes_name];

  var max = checkboxes.length;

  //when only one in the list
  if (typeof checkboxes.length=='undefined'||checkboxes=='undefined'){
    var checkboxes = document.getElementById(checkboxes_name);
      total = 1;
    for (var x = 0; x < max; x++) {
      if (eval("checkboxes[" + x + "].checked") == true) {
         total += 1;

  return total;


Then, for PHP/ASP processing, your checkboxes should be labeled with the brackets [] so the server interprets the items as an array. For the sake of demonstration, this one is named "webpage[]".

    <input type="checkbox" name="webpage[]">

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