javascript - Limit various checkbox inside different classes independently -

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i'm novice js , jquery , i'm facing problem cannot solve knowledge... have site lets users select different types of salads different options, need limit choices of items , don't know how it. checkboxes resides inside class, have many of them , wanted limit ones in particular class.

$(document).ready(function(){             $('#dressing-1 input[type=checkbox]').click(function(){                 if($('#dressing-1 input[type=checkbox]:checked').length>=2){                     alert($('#dressing-1 input[type=checkbox]:checked').length);                     $('#dressing-1 input[type=checkbox]:not(:checked)').prop("disabled", true);                 } else {                     $('#dressing-1 input[type=checkbox]').prop("disabled", false);                 }             });     });

this code have right , it's working, first item. make code available of items class .contenido-dressign , i'm using id #dressing-1 corroborates works well. idea make more elegant code instead of using #dressing-1 #dressing-2.. etc... that's why i'm trying apply container .contenido-dressing.

this site: lunchtime.cl/menu

the this in function click refer checkbox itsefl, doesnt call of checkbox. : 

$(document).ready(function(){     $('.contenido-dressing').find(':checkbox').change(function(){         var parent = $(this).parent()         if(parent.find(':checked').length >= 2){             parent.find(':checkbox:not(:checked)').attr('disabled', true);         } else {             parent.find(':checkbox').attr('disabled', false );         }     }); });

don't need each function, bind checkbox who's div .contenigo-dressing , find parent.

here fiddle : http://jsfiddle.net/syz9z/


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