JQuery Select all fields and check for duplicates, respond with message -


i trying create button selects fields queried inside select. has check duplicates , prompt message if there duplicates allowing user select own fields. appreciated.

$.get_id_num = function(num){     var num_str = num.tostring();     var elements = num_str.split('|');     return elements[0]; }   $.select_all_nbrs = function() {     $("select[multiple] option").attr('selected', 'selected'); }    $( '#id_selectall_btn').click( function() {         var nbr = $.get_id_nbr("#id_nbrs");             if($("#id_nbrs option[value='nbr']").length == 0){                 show_messages("duplicate!");             }else{                 ($.select_all_nbrs("#id_nbrs"));         }                        }); 

$.select_all_nbrs = function(id) {     $("#"+id+" > option").attr('selected', 'selected'); }    $( '#id_selectall_btn').click( function() {         var nbr = $("#id_nbrs");         var duplicate=false;         nbr.find("option").each(function(){             if(nbr.find("option[value='"+$(this).val()+"']").length >1){                 duplicate=true;                 show_messages("duplicate! value "+$(this).val());             }           });         if(!duplicate){             ($.select_all_nbrs("#id_nbrs"));         }  });

as per comment if want select duplicates message try below code 

$.select_all_nbrs = function(id) {     var nbr = $("#id_nbrs");      var duplicate=false;     nbr.find("option").each(function(){         if(nbr.find("option[value='"+$(this).val()+"']").length >1){             duplicate=true;             show_messages("duplicate! value "+$(this).val());         }else{             $(this).attr('selected', 'selected');         }       });  }    $( '#id_selectall_btn').click( function() {          ($.select_all_nbrs("#id_nbrs"));  });

as per comment op want compare first option duplicates notice changed line if(nbr.find("option[value^='"+$.get_id_num($(this).val())+"|']").length >1){

value^= means value starts with.. condition mean find options have value starting $.get_id_num($(this).val())+"|" if length greater 1 means duplicate. need add | <option value="1|2|3"> not duplicate of <option value="11|2|3"> duplicate of <option value="1|5|8">

$.select_all_nbrs = function(id) {     var nbr = $("#id_nbrs");      var duplicate=false;     nbr.find("option").each(function(){         if(nbr.find("option[value^='"+$.get_id_num($(this).val())+"|']").length >1){             duplicate=true;             show_messages("duplicate! value "+$(this).val());         }else{             $(this).attr('selected', 'selected');         }       });  }  $.get_id_num = function(num){     var num_str = num.tostring();     var elements = num_str.split('|');     return elements[0];  }  $( '#id_selectall_btn').click( function() {          ($.select_all_nbrs("#id_nbrs"));  });

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