javascript - Jquery Dropdown on change not working -

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this code below should capture selected value , add div. can't life of me code respond. i've tried different selectors , event listeners still doesn't work. appreciated!

$("#mapdatatable select").on("change", function(){ var option = $(this).val(); $("#exbuilder").innerhtml += ' '+option; });  $("#mapdatacolumn select").on("change", function(){ var option = $(this).val(); $("#exbuilder").innerhtml += ' '+option; });  $("#analyzefunction").on("change", function(){ var option = $(this).val(); $("#exbuilder").innerhtml += ' '+option; });  $("#parametervalue select").on("change", function(){ var option = $(this).val(); $("#exbuilder").innerhtml += ' '+option; });

map datatable t_ 

                    <div id="mapdatacolumn" name="mapdatacolumn" style="width: calc(25% - 4px)"  class='inlineblock hundredheight'>                         <select id="">                             <option value="" disabled selected>map data column</option>                             <option value="c_">c_</option>                         </select>                                        </div><!--mapdatacolumn-->                     <div id="analyzefunction" name="analyzefunction" style="width: calc(25% - 4px)"  class="inlineblock hundredheight">                         <select id="">                             <option value="" disabled selected>analyze function</option>                             <option value="add">add +</option>                             <option value="subtract">subtract -</option>                             <option value="multiple">multiply *</option>                             <option value="divide">divide /</option>                             <option value="greater">greater ></option>                             <option value="less">less <</option>                             <option value="greatequal">greater | equal</option>                             <option value="lessequal">less | equal</option>                             <option value="equal">equal =</option>                             <option value="notequal">not equal <></option>                             <option value="and">and &</option>                             <option value="or">or |</option>                         </select>                     </div><!--analyzefunction-->                     <div id="parametervalue" name="parametervalue" style="width: calc(25% - 4px)"  class="inlineblock hundredheight">                         <select id="">                             <option value="" disabled selected>display parameter value</option>                             <option value="amount">amount</option>                             <option value="sum">sum</option>                             <option value="average">average</option>                             <option value="count">count</option>                             <option value="percentage">percentage</option>                             <option value="min">minimum</option>                             <option value="max">maximum</option>                             <option value="median">median</option>                         </select>                     </div><!--parametervalue-->


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