Question

我在node-red浏览器ide上有一个mqtt节点，它正在侦听有关主题的传入消息。

我想在node-red-dashboard中填入包含该信息的列表，因此我添加了一个具有该格式的模板节点：

<ul id="messagesList"></ul>

我不仅想要添加可以通过角度绑定完成的这些信息，我还想删除旧条目，以便最多3条消息在表中。因此，我需要在每个可以访问仪表板页面的传入消息上运行javascript。

我怎样才能实现这一目标？每次收到消息时，如何运行带有访问html页面的JavaScript？

Answer 1

添加函数节点，以将消息存储在流上下文中。

var message = msg.payload;
var messages = flow.get("messagesList") || [];

if(messages.length < 3) {

  //Push to message list
  messages.push(message);
} else {

  //Remove first message and add new one
  messages.splice(0,1);
  messages.push(message);
}

flow.set("messagesList", messages);

msg.payload = messages;
return msg;

在dahsboard模板节点中，使用ng-repeat显示列表，例如：

<ul id="messagesList">
  <li ng-repeat="x in msg.payload">{{x}}</li>
</ul>

工作示例：

[{"id":"5c713e84.dacb98","type":"function","z":"47849408.20a044","name":"","func":"var message = msg.payload;\nvar messages = flow.get(\"messagesList\") || [];\n\nif(messages.length < 3) {\n\n  //Push to message list\n  messages.push(message);\n} else {\n\n  //Remove first message and add new one\n  messages.splice(0,1);\n  messages.push(message);\n}\n\nflow.set(\"messagesList\", messages);\n\nmsg.payload = messages;\nreturn msg;","outputs":1,"noerr":0,"x":310,"y":500,"wires":[["e6bdd32f.ec218"]]},{"id":"e6bdd32f.ec218","type":"ui_template","z":"47849408.20a044","group":"77d3195c.d9af28","name":"","order":0,"width":0,"height":0,"format":"<ul id=\"messagesList\">\n  <li ng-repeat=\"x in msg.payload\">{{x}}</li>\n</ul>","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":460,"y":500,"wires":[[]]},{"id":"87e7fba4.ccfa6","type":"inject","z":"47849408.20a044","name":"","topic":"","payload":"","payloadType":"date","repeat":"2","crontab":"","once":false,"x":150,"y":500,"wires":[["5c713e84.dacb98"]]},{"id":"77d3195c.d9af28","type":"ui_group","z":"","name":"Sensors","tab":"cd626a92.d20a78","disp":true,"width":"9"},{"id":"cd626a92.d20a78","type":"ui_tab","z":"","name":"Dashboard","icon":"dashboard"}]

节点红色仪表板 - 在Mqtt请求中插入列表

1 个答案: