Question

I have for eg code like this

function check(parameters){
some code;
$.post('/url', function(data) {
  //and here I want if data==0 return false from function check
  //if no go and skip to instruction 1
});


   instruction 1;
}

I want in my program later to use if(check(params)==0) but it doesn’t seems to working.
How i can do this in java script? I need to do if($.post…==0)?
Best regards

Answer 1

Ajax is asynchronous, if you want to be synchronous you can use the setting in the ajax method. With an asynchronous request, you can provide a callback function. The callback function will then be run when the ajax message returns.

You could call your check function like this, with a callback function after params.

check(params, function(data) {
  if (data == 0) {
    // do something
  } else {
    // do something else
  }
});

And the run the callback in check when the ajax message returns.

function check(parameters, callback){
  some code;
  $.post('/url', function(data) {
    if (typeof callback === 'function') {
      callback(data);
    }
  }  
}