Node.js：通过前端执行服务器脚本

Question

I'd like to execute some specific node JS files with an on-click event at my Website.

I'm using express to run my server and website. I think the right way to do this is using jQuery with some GET requests. The JS files are working, if i call them simply in the console with "node examplefile.js"

The file looks like this:

var MapboxClient = require('mapbox');
var client = new MapboxClient('');
client.listStyles(function (err, styles) {
    console.log(styles);
});

I want to execute this file everytime an on-click event occurs.

Do I have to export this as a module to my app.js ? This is what I wanted to do, but I failed in the implementation.

Any suggestions or simple examples on how to realize this?

Answer 1

It's much better to create a new module and then call it from express app

create new module (getStyles.js):

var MapboxClient = require('mapbox');
var client = new MapboxClient('');

module.exports = function (done) {

    client.listStyles(function (err, styles) {

        if (err) {
            return done(err);
        }

        done(null, styles);
    });

}

Use it inside express app:

...

var getStyles = new MapboxClient('path/to/getStyles');

app.get( '/your/route/here', function (req, res, next) {

    getStyles( function (err, styles) {

        if (err) return next(err);

        res.render('view', styles)

    });

});

...

However if you want to execute a command line from express, then use exec function, here is an example:

...

const exec = require('child_process').exec;

app.get( '/on/click/buton/route', function (req, res, next) {

    exec('/usr/bin/node file/path/.js', function (err, stdout, stderr) {
        if (err) {
            return next(err);
        }
        // send result to the view
        res.render('veiw', { res:  stdout});
    });

});

...

Answer 2

1.Write your examplefile.js within a function

function a(){
var MapboxClient = require('mapbox');
var client = new MapboxClient('');
client.listStyles(function (err, styles) {
console.log(styles);
});

2.Include examplefile.js in your app.js

<script src="examplefile.js" type="text/javascript"></script>

3.Then call a() by onclick() event from your app.js file

<input type="button" onclick="javascript: a();" value="button"/>

That is what i understood, you are trying to do.