Problem in the ajax

Question

I am not getting the answer in the ajax request. The code does not confirm whether it is working or not.

<script type="text/javascript">
    function iniciarAjax(){
        var ajax = false;
        if(window.XMLHttpRequest){
            ajax = new XMLHttpRequest();
        }else if(window.ActiveXObject){
            try{
                ajax = new ActiveXObject("Msxml2.XMLHttpRequest");
            }
            catch(e){
                try{
                    ajax = new ActiveXObject("Microsoft.XMLHttpRequest");
                }catch(ex){
                    ajax = false;
                }
            }
        }
        return ajax;
    }
    var conectarServidor = iniciarAjax();
    if(conectarServidor){
        conectarServidor.onreadystatechange = function(){
            if(conectarServidor.readyState == 4){
                if(conectarServidor.status == 200{
                    alert("Tudo certo")
                }
                else{
                    alert("Problema ocorreu")
                }
            }
            conectarServidor.open("GET","http://localhost/locadora/cadastro.php");
            conectarServidor.send();
        }
    }
</script>

Answer 1

The lines

conectarServidor.open("GET","http://localhost/locadora/cadastro.php");
conectarServidor.send();

have to test out of .onreadystatechange = function(){ for that is the function that will run when ajax starts to change its state. Having it in there it will never run because the .send() was never executed.

function iniciarAjax() {
  var ajax = false;
  if (window.XMLHttpRequest) {
    ajax = new XMLHttpRequest();
  } else if (window.ActiveXObject) {
    try {
      ajax = new ActiveXObject("Msxml2.XMLHttpRequest");
    } catch (e) {
      try {
        ajax = new ActiveXObject("Microsoft.XMLHttpRequest");
      } catch (ex) {
        ajax = false;
      }
    }
  }
  return ajax;
}
var conectarServidor = iniciarAjax();
if (conectarServidor) {
  conectarServidor.onreadystatechange = function() {
    if (conectarServidor.readyState == 4) {
      if (conectarServidor.status == 200) {
          alert("Tudo certo")
        } else {
          alert("Problema ocorreu")
        }
      }
    }
  }
  conectarServidor.open("GET", "http://localhost/locadora/cadastro.php");
  conectarServidor.send();
}