AJAX javascript, PHP post does not work [closed]

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AJAX javascript, PHP post does not work [closed]

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#1 by (2 votes)
#2 by (1 votes)

0

Hello, I have a javaScript code to send data using AJAX to a PHP page, my problem is that the POST is going empty for the page I am calling. This only happens when I call the JavaScript (AJAX) function that does the request, when I call the PHP page direct by the action POST works normally. What can it be?

 function AjaxExecute(arquivo){
        var ajax;

        if(window.XMLHttpRequest){ 

            ajax = new XMLHttpRequest();

        } else {

            try{
                ajax = new ActiveXObject("Msxml2.XMLHTTP");
            }catch(e){
                ajax = new ActiveXObject("Microsoft.XMLHTTP");
            }   
        }

        ajax.onreadystatechange = function(){

            if(ajax.readyState == 4 && ajax.status == 200){

                return this.responseText;
            }
        }

        ajax.open("post",arquivo);
        ajax.send(null);

}

javascript ajax post

asked by anonymous 15.04.2017 / 15:57

2 answers

UnboundLocalError: local variable 'adversary_1' referenced before assignment How to disable a function already enabled, or vice versa?

score 2 · Answer 1

You are missing url , and set header :

...
var url = "receberFicheiro.php";
ajax.open("post", url, "true");
ajax.setRequestHeader("Content-type", "multipart/form-data");
ajax.onreadystatechange = function(){
   if(ajax.readyState == 4 && ajax.status == 200){
      # ???
      return this.responseText;
   }
}
ajax.send(ficheiro);

And attention to return .

score 1 · Answer 2

Change the return to a callback (read this What is the real advantage of using a CallBack and what is thread / multithread? )

And finally set the if to detect HTTP or connection errors:

Then adjust the header to use POST (read this AJAX Javascript Pure Asynchronous )

function AjaxExecute(arquivo, variaveis, success, fail){
    var ajax;

    variaveis = !variaveis ? null : variaveis;

    if(window.XMLHttpRequest){ 

        ajax = new XMLHttpRequest();

    } else if (window.ActiveXObject) {

        try{
            ajax = new ActiveXObject("Msxml2.XMLHTTP");
        }catch(e){
            ajax = new ActiveXObject("Microsoft.XMLHTTP");
        }
    } else {
        //Simula um erro acaso Ajax não esteja disponivel (quase improvavel)
        setTimeout(error, 1, 0);
        return;
    }

    ajax.onreadystatechange = function(){

        if(ajax.readyState == 4){
            if (ajax.status == 200) {
                //Callback se retornar status HTTP 200
                success(this.responseText);
            } else {
                //Calllback se retornar qualquer outro status até 0 (sem conexão)
                fail(ajax.status);
            }
        }
    }

    ajax.open("post", arquivo);

    //Ajusta a requisição para trabalhar o POST
    ajax.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

    //Envia os dados via POST
    ajax.send(variaveis);
}

function sucesso(resposta) {
    alert(resposta);
}

function erro(codigo) {
    alert("Erro na requisição:" + codigo);
}

AjaxExecute("pagina.php", "foo=1&bar=2", sucesso, erro);