javascript - Cascade dropdown not working using JS -


i have 1 file php , js. in file have 3 dropdowns, tried apply cascading it's not working. when choose option in first dropdown, 2nd dropdown down have no value.

how fix this?

php dropdown:

<form action='' method='post' name='resumedatabank' id='resumedatabank'> <div class="div-select"> <label for="list_position" id="#ddress_search label">position</label> <br/> <select name="list_position" id="filterbyposition">     <option name="default" class="filter_by" selected="selected" value="select position">select position</option>     <?php     foreach($query_position $option){         if(isset($_post['list_position']) && $_post['list_position'] == $option->position)             echo '<option name="list_position" class="filter_by" selected value="'. $option->position .'">'. $option->position .'</option>';         else          echo '<option name="list_position" class="filter_by" value="'. $option->position .'">'. $option->position .'</option>';     };     ?> </select> </div> <div class="div-select"> <label for="list_location" id="#ddress_search label">location</label> <br/> <select name="list_location" id="filterbylocation">     <option name="default" class="filter_by" selected="selected" value="select location">select location</option>     <?php     foreach($query_locations $option){         if(isset($_post['list_location']) && $_post['list_location'] == $option->hiring_location)             echo '<option name="list_location" class="filter_by" selected value="'. $option->hiring_location .'">'. $option->hiring_location .'</option>';         else          echo '<option name="list_location" class="filter_by" value="'. $option->hiring_location.'">'. $option->hiring_location .'</option>';      };     ?> </select> </div> <div class="div-select"> <label for="list_processed" id="#ddress_search label">processed</label> <br/> <select name="list_processed" id="filterbyprocessed">     <option name="default" class="filter_by" selected="selected" value="select processed">select processed</option>     <?php     foreach($query_processed $option){         if(isset($_post['list_processed']) && $_post['list_processed'] == $option->processed_option)             echo '<option name="list_processed" class="filter_by" selected value="'. $option->processed_option .'">'. $option->processed_option .'</option>';         else          echo '<option name="list_processed" class="filter_by" value="'. $option->processed_option.'">'. $option->processed_option .'</option>';      };     ?> </select> </div> <div class="div-input"> <input type="submit" value="search" class="div-input-submit"/> </div> </form>

js:

    jquery("#filterbyposition").live('change',function() {     var selectval = jquery('#filterbyposition :selected').val();     alert(selectval);     var $output = jquery('#filterbylocation').html('');      jquery.ajax({         url: 'page-resume-databank.php',         data: "n="+selectval,         datatype: 'json',         success: function(data){             jquery.each(data, function(key,value){                 $output.append("<option value='"+value.id+"'>"+value.filterbylocation+"</option>");             });         }      }); });

your code wrong

jquery("#filterbyposition").live('change',function() {     var selectval = jquery('#filterbyposition :selected').val();     alert(selectval);     *var $output = jquery('#filterbylocation').html('');*

you add event filterbyposition, code jquery('#filterbylocation').html('') set 2nd dropdown down have no value.

change jquery('#filterbyposition').html('')


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