如何在Node JS中将数据发布回网页

Question

Just started working with Node.js and now i successfuly configured Postgres database. I can fetched the records from db and I can also see records cound in console.log. But now i am little bit stuck how to post data back on same page.

I have page called index with two text fields and one submit button. When i submit my data with username and id, i receive this request in request.post method.

router.post('/', function (req, res) {
    var username = req.body.username;
    var userid = req.body.userid;

    // method which take parameters and return records from db
    getRecords(userid, username, function (result, found) {
        if (found) {
            console.log(result.rows.length);
        }
    });
}); 

After successful transcation from db, I can see the record count in console. But now how can i post this data into the same page (index.ejs) from where i received this request.

I tried to do

res.send('/', { title: result.rows.length });

and in ejs file

<p>Count is <%= title %></p>

but i received error that "title" is not defined. So how can i display count and how can i display the list of records which i fetched from database.

Answer 1

只需编写red.send（result）即可，或者如果您想发送多个响应，则可以red.write（result）并记住在网页中捕获了从nodejs发送的结果

Answer 2

You need to use res.render() if you want to render a template with some variables. For example:

// or res.render('index', ...)
res.render('index.ejs', { title: result.rows.length });

This assumes you have your app's views settings set up properly.