How to send a variable to a NodeJS controller from an AngularJS service?

Question

I have an AngularJS service called sensorReadingsAPI, which has the following function with get:

var _countSensorReadingsFilter = function () {
  return $http.get(config.baseUrl + "/sensorReading/countFilter").then(function (data,status) {
    sensorReadingCountFilter = data.data;
    return Number(sensorReadingCountFilter);
  }).catch(function() {});
};

The /countFilter is defined in a NodeJS controller:

module.exports = {
  countFilter: function (req, res) {
    return res.sensorReadingCountFilter();
  }
};

And sensorReadingCountFilter is as follows:

module.exports = function sensorReadingCountFilter(statusCode){

  var req = this.req;
  var res = this.res;

  SensorReading.count({deviceNum:'MBA002'}).exec(function countCB(error, found) {
    return res.view({val: found});
  });
};

Right now, the count is static (where is written {deviceNum:'MBA002'}). I need a way to make this value be dinamic, using a variable, preferably being send from the AngularJS controller. I have several devices, with the portential to add even more, and don't want to create a /countFilter module for each of them.

In other words, a way to send variables from an AngularJS service to a NodeJS controller. When searching for ways to do this, I have found next to nothing.

For clearance: all of this returns the number of readings from the selected device, and config.baseUrlis the local machine and port.

Samich · Accepted Answer · 2017-04-04 22:14:16Z

1

You can use url parameters in your $http.get('url-here?param1=1,param2=2') and then you can access these params in your req object on the server side req.query.param1.

You also can specify params in config object of $http:

$http.get('my-url-here', { params: {deviceNum:'MBA002'} })
    .success()
    ...

edited Apr 4, 2017 at 22:14

answered Apr 4, 2017 at 22:09

Samich

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4 Comments

jcaron Over a year ago

I wouldn't say "also". Using params is the right way to do it. Composing an URL manually usually ends up with missing encodeURIComponent calls.

Ernani Over a year ago

I was unaware that it was possible to use url parameters using ?param. This is exactly what I need.

Ernani Over a year ago

As a side note, do you know if it's best practice to let the server side (in this case, NodeJS) handle DB requests, or can I do them directly from AngularJS?

Samich Over a year ago

Server side. Between your angular app and api you are using RESTful API (I assume) and probably some security layer where DB connections usually using different protocols. I don't even know if you can do DB connection management form Angular with exception probably on couple No-Sql DB's.

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