javascript - can't get .on() to work -


i know topic has been asked lot before read lot of stackoverflow posts , can't figure out. either i'm doing silly mistake or using code wrong. in case i'd appreciate other sets of eyes.

my code simple. elements being dragged boxes , want user able close dragged boxes can redo dragging. 

  <div id="questioncontainer">    <div class='row-fluid'>       <div class='span3 box-content'>         <div class="box span12">             <input type="text" placeholder="column 1" />         </div>         <div class="box span12  groupboxes">         </div>       </div>        <div class='span3 box-content'>         <div class="box span12">             <input type="text" placeholder="column 2" />         </div>         <div class="box span12  groupboxes">         </div>       </div>        <div class='span3 box-content'>         <div class="box span12">             <input type="text" placeholder="column 3" />         </div>         <div class="box span12  groupboxes">         </div>       </div>        <div class='span3 box-content'>         <div class="box span12">             <input type="text" placeholder="column 4" />         </div>         <div class="box span12 groupboxes">         </div>       </div>   </div>

then there javascript appends dragged element. , have .on() function there doesn't work @ all. 

    $( ".groupboxes" ).droppable({       accept: ".sdrag",       drop: function( event, ui ) {         var studentid = $(ui.draggable).attr('uid');          var studentname = $(ui.draggable).find(".sname").text();         console.log(studentid + ' ' + studentname);            var dropbox = "<div class='box questionbox' uid='"+studentid+"' ><div class='box-content box-statistic'><h3 class='title text-error'>"+studentname+"</h3><div class='icon-remove align-right card-remove' style='font-size:12px'></div></div> </div>";            $(this).append(dropbox);         }     });  $("#questioncontainer").on('click', '.card-remove',  function () {     console.log('hi');     var student = $(this).parent('.questionbox').attr('uid'); // user number     var box = $(".studentbox[value='"+student+"']")// find original object through user     box.removeclass('muted-background').addclass('sdrag');// in original object, add class sdrag , remove class muted-background     // remove object clicked  });

any ideas what's going wrong here?

try define dropbox outside function

var dropbox;     $( ".groupboxes" ).droppable({   accept: ".sdrag",   drop: function( event, ui ) {     var studentid = $(ui.draggable).attr('uid');      var studentname = $(ui.draggable).find(".sname").text();     console.log(studentid + ' ' + studentname);         dropbox = "<div class='box questionbox' uid='"+studentid+"' ><div class='box-content box-statistic'><h3 class='title text-error'>"+studentname+"</h3><div class='icon-remove align-right card-remove' style='font-size:12px'></div></div> </div>";        $(this).append(dropbox);     } });  $("#questioncontainer").on('click', '.card-remove',  function () {     console.log('hi');     var student = $(this).parent('.questionbox').attr('uid'); // user number     var box = $(".studentbox[value='"+student+"']")// find original object through user     box.removeclass('muted-background').addclass('sdrag');// in original object, add class sdrag , remove class muted-background     // remove object clicked  });

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