Karlos Garcia Karlos Garcia - 7 months ago 10
Javascript Question

I need wait for HTTP response

i need to do several readings HTTP, and i need wait for response. But HTTP is async. Then i don't know how.

my code is:

var clientelee = Ti.Network.createHTTPClient({
// function called when the response data is available
onload : function(e) {
Ti.API.info("******* Recibido: " + this.responseText);
},
// function called when an error occurs, including a timeout
onerror : function(e) {
Ti.API.debug("****** ERROR *********"+e.error);
},
onreadystatechange: function(e){
Ti.API.info("******* STATUS *********"+e.readyState);
},
timeout : 3000 // in milliseconds
});

function LeeDatos(){
url = "http://www.hola.com/read/"+leoSerie;
// Prepare the connection.
clientelee.open("GET", url);
// Send the request.
clientelee.send();
}


for (i=0;i<NRegistros;i++){
TablaSerieTermostatos[i]=rows.field(0);
leoSerie=rows.field(0);
LeeDatos();
......
}


Any suggestion?? Thanks

Answer

On the callback could you not just pass function and when it's loaded continue with your code.

 onload : function(e) {
    Ti.API.info("*******      Recibido: " + this.responseText);
    LoadedData();
 },

function LoadedData() {
    // Data loaded from ASYNC Carry on...
}

or you could do it this way:

function waitForResponse( type, url, callback ) {

    var client = Ti.Network.createHTTPClient({
        // function called when the response data is available
        onload : function(e) {
            Ti.API.info("*******      Recibido: " + this.responseText);
            callback();
        },
        // function called when an error occurs, including a timeout
        onerror : function(e) {
            Ti.API.debug("****** ERROR *********"+e.error);
        },
        onreadystatechange: function(e){
            Ti.API.info("******* STATUS *********"+e.readyState);
        },
        timeout : 3000  // in milliseconds
    });

    client.open(type, url);

    client.send(); 
}

function LeeDatos(){
    url = "http://www.hola.com/read/"+leoSerie;

     waitForResponse( "GET", url, function() {
        // Data Ready... 
     });  
}

for (i=0;i<NRegistros;i++){
    TablaSerieTermostatos[i]=rows.field(0);
    leoSerie=rows.field(0);
    LeeDatos();
    ......
}