javascript - 我需要等待 HTTP 响应

Question

我需要多次读取 HTTP，并且需要等待响应。但 HTTP 是异步的。那我就不知道怎么办了。

我的代码是:

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();
    ......
}

有什么建议吗？谢谢

Answer 1

在回调中，您不能只传递函数，并在加载函数时继续执行您的代码。

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

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

或者你可以这样做:

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();
    ......
}