Return value of $.post() call

Question

I have a jquery $.post function lik so:

$.post(\'/test\',json_data, function(data) {
                                result=data
});

this fun

Answer 1

Check for validity inside the callback

 $.post('/test',json_data, function(data) {
    var result=data;
    if(result === true) {
        // do some ok processing...
        } else {
        // do not ok processing...
        }
});

Answer 2

This is considered a bad practice but there is an async parameter in $.ajax() that you can set to false and wait synchronously for a result:

var result;
$.ajax({
  type: 'POST',
  url: '/test',
  data: json_data,
  async: false,
  success: function(data) {
    result=data;
  },
  dataType: 'application/json'
});
//result available here

A more idiomatic, although slightly less convenient in this case, would be to take advantage of callbacks:

function validate(okCallback, errorCallback) {
    $.post('/test',json_data, function(data) {
        if(data) {
            okCallback();
        } else {
          errorCallback();
        }
    });
}

validate(
    function() {
        //proceed
    },
    function() {
        //display validation error
    }
}