qt qml ajax 获取 json 天气数据示例

依赖ajax.js类库，以下代码很简单的实现了获取天气json数据并展示的任务

【TestAjax.qml】

import QtQuick 2.0
import "ajax.js" as Ajax


/**
测试用ajax 获取 json 数据
更复杂的ajax调用请查看 qml/network/ 相关示例
*/
Grid{
     600
    height: 400
    spacing: 10
    columns: 2

    Text {text: 'city:'}
    Text {id:city; text:' '}

    Text {text: 'date:'}
    Text {id:date; text:' '}

    Text {text: 'temp:'}
    Text {id:temp1; text:' '}

    Component.onCompleted: {
        // 中国天气网实况天气接口（可用）
        Ajax.get("http://www.weather.com.cn/data/sk/101010100.html",
            function(result, json){
                city.text = json.weatherinfo.city;
                date.text = json.weatherinfo.time;
                temp1.text = json.weatherinfo.temp;
            }
        );

        /*
        // 中华万年历的当天及预告天气接口（可用）
        Ajax.get("http://wthrcdn.etouch.cn/weather_mini?city=%E5%8C%97%E4%BA%AC",
            function(result, json){
                city.text = json.data.city;
                date.text = json.data.forecast[0].date;
                temp1.text = json.data.wendu;
            }
        );
        */

        /*
        // 中国天气网当天及预告天气接口（接口挂了）
        Ajax.get("http://m.weather.com.cn/data/101010100.html",
            function(result, json){
                city.text = json.weatherinfo.city;
                date.text = json.weatherinfo.date_y;
                temp1.text = json.weatherinfo.temp1;
            }
        );
        */
    }
}

【ajax.js】

// GET
function get(url, success, failure)
{
    var xhr = new XMLHttpRequest;
    xhr.open("GET", url);
    xhr.onreadystatechange = function() {
        handleResponse(xhr, success, failure);
    }
    xhr.send();
}

// POST
function post(url, arg, success, failure)
{
    var xhr = new XMLHttpRequest;
    xhr.open("POST", url);
    xhr.setRequestHeader("Content-Length", arg.length);
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded;");  //用POST的时候一定要有这句
    xhr.onreadystatechange = function() {
        handleResponse(xhr, success, failure);
    }
    xhr.send(arg);
}



// 处理返回值
function handleResponse(xhr, success, failure){
    if (xhr.readyState == XMLHttpRequest.DONE) {
        if (xhr.status ==  200){
            if (success != null && success != undefined)
            {
                var result = xhr.responseText;
                try{
                    success(result, JSON.parse(result));
                }catch(e){
                    success(result, {});
                }
            }
        }
        else{
            if (failure != null && failure != undefined)
                failure(xhr.responseText, xhr.status);
        }
    }
}

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