How can I return a value from getJSON?

Question

  $("#search-box").keyup(function(){
            var filter = $(this).val();

            var req = {
                    action: 'getItem',
                    filter: filter              
                };

            this.getJSON('videos.php', req, function(serverData)
            {

            });
   });

I have above function which returns values. How can I return the serverData?

and `this` will refer to the element that tiggered the event, are you meaning `jQuery.getJSON` ? — Patrick Evans, Feb 13 '15 at 20:59
You need to use a Promise (a Deferred) in jQuery land. http://api.jquery.com/category/deferred-object/ — Gary Storey, Feb 13 '15 at 21:00
@GaryStorey, you dont need a promise, you can pass getJSON a success callback — Patrick Evans, Feb 13 '15 at 21:01
@aptlmsnkrdsm What do you mean by `return`? Wondering if this is a terminology issue or if you actually wanted to return a value from it. This distinction will affect whether or not it is a duplicate. — Kevin B, Feb 13 '15 at 21:18
Right... but what's confusing is i don't see in your code why you would think you need to return data from the getJSON. you didn't show how you intended to use the data or where you wanted to use it. — Kevin B, Feb 13 '15 at 21:24

score -1 · Answer 1 · answered Feb 13 '15 at 21:13

-1

Try something like:

$("#search-box").keyup(function(){
   var filter = $(this).val();
   var that = this;
   var req = {
       action: 'getItem',
       filter: filter              
   };
   $.when( $.getJSON( "videos.php", req ) ).then(function( serverData, textStatus,jqXHR )
     {
        call_some_function_which_handles_response(serverData);
     });

});

answered Feb 13 '15 at 21:13

Chorn

49
3

This does not work because other function is not loaded when i call it. I get undefined 'function' error – aptlmsnkrdsm Feb 13 '15 at 21:17
$.when(...).then(...) is not needed. – Kevin B Feb 13 '15 at 21:18
but why it does not work? I get this error: Uncaught TypeError: undefined is not a function. – aptlmsnkrdsm Feb 13 '15 at 21:19
you should rename call_some_function_which_handles_response into the function, which you want to handle received data. – Chorn Feb 13 '15 at 21:19
i created another one like this.handleData but not working. – aptlmsnkrdsm Feb 13 '15 at 21:20
or substitute call_some_function_which_handles_response(serverData); with console.log (serverData); you will see data from the server on javascript console. – Chorn Feb 13 '15 at 21:20
change this. to that – Chorn Feb 13 '15 at 21:21

How can I return a value from getJSON?

1 Answers1