使用HTTPClient和JSON处理远程数据(译)

原文地址：http://docs.appcelerator.com/titanium/2.1/index.html#!/guide/Handling_Remote_Data_with_HTTPClient_and_JSON-section-29004823_HandlingRemoteDatawithHTTPClientandJSON-json.txt%28fromourtargetURLhttps%3A%2F%2Fraw.github.com%2Fappcelerator%2FDocumentationExamples%2Fmaster%2FHTTPClient%2Fdata%2Fjson.txt%29

Titanium.Network.HTTPClient框架

var url = "https://www.appcelerator.com";
var xhr = Ti.Network.createHTTPClient({
onload: function(e) {
// this.responseText holds the raw text return of the message (used for JSON)
// this.responseXML holds any returned XML (used for SOAP web services)
// this.responseData holds any returned binary data
Ti.API.debug(this.responseText);
alert('success');
},
onerror: function(e) {
Ti.API.debug(e.error);
alert('error');
},
timeout:5000
});

xhr.open("GET", url);
xhr.send();

创建一个对象保存要访问的URL

创建HTTPClient对象，该对象有2个方法onload和onerror

onload：这个方法将要求从目标URL成功响应，响应数据可以处理使用HTTPClient3种不同的属性类别。

this.responseText--处理JSON

this.responseXML--处理SOAP或其他XML格式的网络服务。

this.responseData--处理二进制数据

onerror：这个方法响应错误信息，

this.responseText

this.status

e.error

实例代码：

Ti.UI.backgroundColor = '#dddddd';

var url = "https://raw.github.com/appcelerator/Documentation-Examples/master/HTTPClient/data/json.txt";
var win = Ti.UI.createWindow();
var table = Ti.UI.createTableView();
var tableData = [];
var json, fighters, fighter, i, row, nameLabel, nickLabel;

var xhr = Ti.Network.createHTTPClient({
onload: function() {
// Ti.API.debug(this.responseText);

json = JSON.parse(this.responseText);
for (i = 0; i < json.fighters.length; i++) {
fighter = json.fighters[i];
row = Ti.UI.createTableViewRow({
height:'60dp'
});
nameLabel = Ti.UI.createLabel({
text:fighter.name,
font:{
fontSize:'24dp',
fontWeight:'bold'
},
height:'auto',
left:'10dp',
top:'5dp',
color:'#000',
touchEnabled:false
});
nickLabel = Ti.UI.createLabel({
text:'"' + fighter.nickname + '"',
font:{
fontSize:'16dp'
},
height:'auto',
left:'15dp',
bottom:'5dp',
color:'#000',
touchEnabled:false
});

row.add(nameLabel);
row.add(nickLabel);
tableData.push(row);
}

table.setData(tableData);
},
onerror: function(e) {
Ti.API.debug("STATUS: " + this.status);
Ti.API.debug("TEXT:   " + this.responseText);
Ti.API.debug("ERROR:  " + e.error);
alert('There was an error retrieving the remote data. Try again.');
},
timeout:5000
});

xhr.open("GET", url);
xhr.send();

win.add(table);
win.open();