我正在尝试为我的实体的每个属性获取类型字段。查询 Orion 和获取实体不是问题(我通过 NGSI Source 小部件执行此操作),而是获取这些参数的方式。
来自 NGSI Source(通常订阅 Orion 实例):
var doInitialSubscription = function doInitialSubscription() {
this.subscriptionId = null;
this.ngsi_server = MashupPlatform.prefs.get('ngsi_server');
this.ngsi_proxy = MashupPlatform.prefs.get('ngsi_proxy');
this.connection = new NGSI.Connection(this.ngsi_server, {
ngsi_proxy_url: this.ngsi_proxy
});
var types = MashupPlatform.prefs.get('ngsi_entities').split(new RegExp(',\\s*'));
var entityIdList = [];
var entityId;
for (var i = 0; i < types.length; i++) {
entityId = {
id: '.*',
type: types[i],
isPattern: true
};
entityIdList.push(entityId);
}
var attributeList = null;
var duration = 'PT3H';
var throttling = null;
var notifyConditions = [{
'type': 'ONCHANGE',
'condValues': MashupPlatform.prefs.get('ngsi_update_attributes').split(new RegExp(',\\s*'))
}];
var options = {
flat: true,
onNotify: handlerReceiveEntity.bind(this),
onSuccess: function (data) {
this.subscriptionId = data.subscriptionId;
this.refresh_interval = setInterval(refreshNGSISubscription.bind(this), 1000 * 60 * 60 * 2); // each 2 hours
window.addEventListener("beforeunload", function () {
this.connection.cancelSubscription(this.subscriptionId);
}.bind(this));
}.bind(this)
};
this.connection.createSubscription(entityIdList, attributeList, duration, throttling, notifyConditions, options);
};
var handlerReceiveEntity = function handlerReceiveEntity(data) {
for (var entityId in data.elements) {
MashupPlatform.wiring.pushEvent("entityOutput", JSON.stringify(data.elements[entityId]));
}
};
到 MyWidget:
MashupPlatform.wiring.registerCallback("entityInput", function (entityString) {
var entity;
entity = JSON.parse(entityString);
id = entity.id;
type = entity.type;
for(var attr in entity){
attribute = entity[attr];
}
我正在尝试编写类似的代码来获取类型字段的值。我怎样才能做到这一点?(我敢肯定这很容易......)