javascript - I can not populate JQuery Autocomplete input with a json request to cakephp -

i using jquery autocomplete send json request cakephp application, javascript code http://jqueryui.com/autocomplete/

  $(function() {     function split( val ) {       return val.split( /,\s*/ );     }     function extractlast( term ) {       return split( term ).pop();     }      $( "#tag-string" )   // don't navigate away field on tab when selecting item       .bind( "keydown", function( event ) {         if ( event.keycode === $.ui.keycode.tab &&             $( ).autocomplete( "instance" ).menu.active ) {           event.preventdefault();         }       })       .autocomplete({         source:function(request, response){            $.getjson("/articles/gettags/" + request.term + ".json", {             term : extractlast(request.term)           }, response);        },         search: function() {           // custom minlength           var term = extractlast( this.value );           if ( term.length < 1 ) {             return false;           }         },         focus: function() {           // prevent value inserted on focus           return false;         },         select: function( event, ui ) {           var terms = split( this.value );           // remove current input           terms.pop();           // add selected item           terms.push( ui.item.value );           // add placeholder comma-and-space @ end           terms.push( "" );           this.value = terms.join( ", " );           return false;         }       });   });(jquery); 

if run xmlhttprequests on chrome js console (where "c" term search for)

$.getjson("/articles/gettags/c.json") 

i response text:

responsetext: "{↵ "tags": [↵ {↵ "tag": "calles"↵ },↵ {↵ "tag": "circulacion"↵ },↵ {↵ "tag": "cognicion"↵ },↵ {↵ "tag": "creatividad"↵ }↵ ]↵}"

but input field not populate values. (i've uploaded image because easiest way explaint it) on "tag string" input field

finally solved. json response send jquery autocomplete must formated "value" , "label".

var ac = [ {     label: "one thing",     value: "one-thing" }, {     label: "two thing",     value: "two-thing" },       

]