How to render an array in an html file? - Node.js, ejs

Question

I'm working on a project, which will use given coordinates from a txt file and graph them. My problem right now: I'm trying to use ejs to render the coordinates into my html file, but it just isn't working right. Ejs always just renders: undefined.

Here is the code:

var http = require('http'),  
    fs = require('fs'),
    express = require('express'), 
    app     = express(); 
    app.use(express.bodyParser());
    app.set('view engine', 'ejs');
    app.engine('html', require('ejs').renderFile); 
    app.use(express.static(__dirname + '/public'));

//Readerfunction 
function readLines(input, done) {
   //..... 

function done(arr) { 
    var obj = {};
    var key1 = arr[0][0];
    var key2 = arr[0][1];
    obj[key1] = [];
    obj[key2] = [];

    arr.shift();

    arr.forEach(function (item) {
        obj[key1].push(item[0]);
        obj[key2].push(item[1]);
    });

      console.log('X:', obj[key1]); // all the variables are logged correctly. 
      console.log('Y:', obj[key2]); 

    app.get('/', function(req, res) {   
          res.render('graph.html', {cordinates: obj});  
}); 
    app.listen(8080, function() {
  console.log('Server running at http://127.0.0.1:8080/');
});
}

In the html file:

<%= cordinates.obj %>

I hope you can help me, solve this problem! :-)

Greetings, JS

Anton Melnikov · Accepted Answer · 2014-01-24 08:25:05Z

1

Well, I think here is the problem: you are passing obj to render as coordinates, so you should use coordinates variable in your template directly, no it's obj property, which is non-existent. I'm not sure if it will be rendered as proper array though, maybe you'll need a loop to print it's elements.

answered Jan 24, 2014 at 8:25

Anton Melnikov

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6 Comments

JSt Over a year ago

why is the obj property non-existent?

Anton Melnikov Over a year ago

Because coordinates variable in your template will be that obj, so you are actually calling obj.obj there.

JSt Over a year ago

Got that. The main problem is just that obj is not defined while rendering. I can change the cordinates for example to test.obj but it is still undefined ..

Anton Melnikov Over a year ago

The problem is in how you accessing it in template. If server code is: res.render('graph.html', {cordinates: obj}); Than template code should be: <%= cordinates %> Second parameter of render maps template variable coordinates to obj value.

JSt Over a year ago

Is it possible to call res.render two times? - I want to send <%= xcoordinates %> and <%= ycoodinates %>, but just one works at a time ..

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