connection.js

/*
 * connectionJs
 * Analysis browser's navigator.connection type
 *
 * Author: Jone Casper
 * Email: xu.chenhui@live.com
 */
(function(root, name, factory) {
	"use strict";
	if (typeof define === 'function' && define.amd) {
		define(function(){
			return factory();
		});
	}else if (typeof module !== 'undefined' && module.exports){
		module.exports = factory();
	}else{
		var namespaces = name.split("."),
			scope = root || this;
		for (var i=0; i<namespaces.length; i++) {
			var p = namespaces[i],
				ex = scope[p];
			scope = scope[p] = (i === namespaces.length - 1) ? 
				factory():
				(ex || {});
		}
	}
}(this, "connectionJs.getConnectType",function(){
	/*
	 * navigator.connection now work on Android, Firefox Mobile (Gecko) and Firefox OS
	 */
	var connection = navigator.connection||navigator.mozConnection||navigator.webkitConnection;
	var type_text = ['unknown','ethernet','wifi','2g','3g','4g','none'];

	function getConnectType(){
		if (!connection){
			return "unknown";
		}
		var conn_type = 'unknown';
		if (typeof connection.type === "number" && connection.type < type_text.length){
			conn_type = type_text[connection.type];
		}else{
			conn_type = connection.type;
		}
		if (conn_type === "unknown" || typeof conn_type === "undefined" || typeof connection.bandwidth === "number"){
			if(connection.bandwidth > 10){
				conn_type = 'wifi';
			}else if(connection.bandwidth > 2){
				conn_type = '3g';
			}else if(connection.bandwidth > 0){
				conn_type = '2g';
			}else if(connection.bandwidth == 0){
				conn_type = 'none';
			}else{
				conn_type = 'unknown';
			}
		}
		return conn_type;
	}
	return getConnectType;
}));