Question

用于检查当前网络连接的标准PhoneGap API（见下文）似乎没有在Ripple Emulator中更新它的结果。当我更改连接类型并执行checkConnection（）时，它会从第一次调用此函数返回连接类型（在deviceready处）

function checkConnection() {    // Checks current network status
    networkState = navigator.connection.type;
    console.log(networkState);

    var states = {};
    states[Connection.UNKNOWN]  = 'Unknown connection';
    states[Connection.ETHERNET] = 'Ethernet connection';
    states[Connection.WIFI]     = 'WiFi connection';
    states[Connection.CELL_2G]  = 'Cell 2G connection';
    states[Connection.CELL_3G]  = 'Cell 3G connection';
    states[Connection.CELL_4G]  = 'Cell 4G connection';
    states[Connection.NONE]     = 'No network connection';

    // DEBUG: notify on network state
    console.log("Connection type: " + states[networkState]);
}

还有什么我需要做的（添加一个事件监听器？）来实现这个目的吗？通常情况下，设备只会在状态从在线更改为离线时触发事件，但我需要区分“免费”互联网和xG连接。

Answer 1

显然，navigator.connection.type并未在Windows平台上的cordova中进行更新。看一下代码，navigator.connection.type只在＆＃39; deviceready＆＃39;之后设置一次。事件

Trick是在相关事件

上使用Connection＃getInfo（）手动更新它

var connection = navigator.connection;
function errorCallback(e) {
  console.warn(e);
};
function updateConnection(info) {
  connection.type = info;
}
document.addEventListener("resume", function() {
  connection.getInfo(updateConnection, errorCallback);
});
document.addEventListener("online", function() {
  connection.getInfo(updateConnection, errorCallback);
});
document.addEventListener("offline", function() {
  connection.getInfo(updateConnection, errorCallback);
});

免责声明：我自己的代码中的重构/复制粘贴片段应该是开箱即用的。

Answer 2

我想说尝试添加一个超时功能来延迟通话。当这解决了问题时，我已经看到了类似的问题。先做：

networkState = navigator.connection.type;

然后：

setTimeout(function(){

    networkState = navigator.connection.type; // have to do this second time to pick up the refreshed value
    console.log(networkState);

    var states = {};
    states[Connection.UNKNOWN]  = 'Unknown connection';
    states[Connection.ETHERNET] = 'Ethernet connection';
    states[Connection.WIFI]     = 'WiFi connection';
    states[Connection.CELL_2G]  = 'Cell 2G connection';
    states[Connection.CELL_3G]  = 'Cell 3G connection';
    states[Connection.CELL_4G]  = 'Cell 4G connection';
    states[Connection.NONE]     = 'No network connection';

    // DEBUG: notify on network state
    console.log("Connection type: " + states[networkState]);
}, 500);

这给navigator.connection.type提供时间（在本例中为500毫秒）以刷新它的值。

来自PhoneGap的网络连接状态不会在Ripple中更新

2 个答案: