ajax - Jquery checkbox not getting checked -

i have function called 'getdata' contains ajax call returns data ( dynamically created list of fruits) via json. have function called 'addfruit' should check checkbox when user clicks button enters text value textbox , value not match 1 of values contained in json data.

for example if data returned ajax call {'orange', 'apple', 'pear'} , user clicks button adds 'banana' textbox, checkbox should checked.

below i've tried far:

  function addfruit(data) {                      var fruit = $("#fruit").val(); //the value of input text box gets populated when user clicks '#buttonadd' button.                       $("#buttonadd").click(function() {                      $.each(data, function (item) {                    if ($('fruit:contains(" + data[item] + ")'))                         {                           $("#oldform").prop ("checked", false);                         } else                             {                                 $("#oldform").prop ("checked", true);                             }                          });                    });               }    getdata().done(addfruit); // when ajax call completed, run addfruit function. 

you forgot ; after calling prop().