我有一个angularjs材料ui开关。我想在外部事件发生时更改其状态。此外部事件是在已发布主题之一上收到的mqtt消息。我正在使用在浏览器上运行的node.js mqtt客户端。
<div ng-controller="SWCtrl">
<md-switch ng-model="switch_status.sw1" aria-label="Switch"
ng-change="onChange(switch_status.sw1)">
Switch: {{ switch_status.sw1 }}
</md-switch>
</div>
相应的控制器代码;
angular.module('myApp.controllers', [])
.controller('SWCtrl', ['$scope',
function ($scope, ) {
$scope.switch_status = {
sw1: true,
};
var mqtt_client = mqtt.connect('ws://127.0.0.1:3000');
mqtt_client.subscribe('hello/world');
mqtt_client.on('connect', function () {
console.log("MQTT connected");
});
mqtt_client.on("message", function(topic, payload) {
console.log([topic, payload].join(": "));
if (topic === "hello/world" && payload.toString() === "switch on")
{
console.log("message on");
$scope.switch_status.sw1 = true;
}
else if (topic === "hello/world" && payload.toString() === "switch off")
{
console.log("message off");
$scope.switch_status.sw1 = false;
}
});
$scope.onChange = function (sw_state) {
if (sw_state === true) {
mqtt_client.publish('hello/world', 'switch on');
}
else if (sw_state === false) {
mqtt_client.publish('hello/world', 'switch off');
}
}
}])
;
控制器中给我带来问题的代码段就在这里;
mqtt_client.on("message", function(topic, payload) {
console.log([topic, payload].join(": "));
if (topic === "hello/world" && payload.toString() === "switch on")
{
console.log("message on");
$scope.switch_status.sw1 = true;
}
else if (topic === "hello/world" && payload.toString() === "switch off")
{
console.log("message off");
$scope.switch_status.sw1 = false;
}
});
当发生外部事件时,我想更改开关状态。我是如何做到的是运行下面的代码行;
$scope.switch_status.sw1 = true;
不幸的是,这不起作用。外部事件发生时如何使开关改变状态?
答案 0 :(得分:3)
在
之后尝试$ scope。$ apply()$scope.switch_status.sw1 = true;
基本上它不是角度事件,所以角度不知道变量是否均匀变化。 scope.apply将强制执行另一个摘要周期