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check if checkbox is checked, check uncheck

/ Published in: jQuery
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source: http://www.electrictoolbox.com/check-uncheck-checkbox-jquery/

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Copy this code and paste it in your HTML 
  1. if($('#chkId:checked').val() != null)
  2. {
  3.  // checked
  4. }
  5.  
  6. //or
  7.  
  8. if($('#chkId:checked').length != 0)
  9. {
  10.  // checked
  11. }
  12.  
  13. //or
  14.  
  15. $('input[name=foo]').is(':checked')
  16. $('input[name=foo]').attr('checked')
  17.  
  18. // check uncheck
  19. $('input[name=foo]').attr('checked', true);

URL: http://drupal.org/node/116548

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