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Kajetan Mazur
2,467 PointsCannot pass array of colors
Hi
I cannot pass array of colors. It says Cannot read property 'length' of undefined. So instead of each color in colors i made each color in ['red','orange','yellow','green','blue','purple'] and it worked,but i would like to pass it as variable. I've got in app.js const express = require('express');
const app = express();
const colors = ['red','orange','yellow','green','blue','purple'];
app.set('view engine', 'pug');
app.get('/', (req,res) => { res.render('index'); });
app.get('/cards', (req,res) => { res.render('card', {prompt: "Who is buried in Grant's tomb?", colors}); });
app.listen(3000, () => { console.log('Aplikacja działa na localhost:3000'); });
it does not work even if i change to : app.get('/cards', (req,res) => { res.render('card', {prompt: "Who is buried in Grant's tomb?", colors: colors}); });
Reid Young
Courses Plus Student 14,209 PointsThe syntax here seems incorrect:
colors}); });
You have an extraneous "});"
Tom Geraghty
24,174 PointsFormatted it looks ok:
app.get('/cards', (req,res) => {
res.render(
'card',
{
prompt: "Who is buried in Grant's tomb?",
colors
}
);
});
See this for more: https://www.codecademy.com/blog/78 Although you don't really need semicolons in JS, that line does look weird, Reid Young
2 Answers
Ben Ridley
2,936 PointsRender doesn't preserve objects, so you'll have to perform some logic on the backend to figure out which colors you want to send, or send them all manually.
Charles Sharpe
2,013 PointsI am having the same problem.
TypeError: ...\Learn Javascript\Flashcards\views\card.pug:11 9| section#content 10| ul
11| each color in colors 12| li= color 13| h2= prompt 14| if hint
Cannot read property 'length' of undefined at eval (eval at wrap (...\Learn Javascript\Flashcards\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:29:31) at eval (eval at wrap (...\Learn Javascript\Flashcards\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:48:4) at template (eval at wrap (...\Learn Javascript\Flashcards\node_modules\pug\node_modules\pug-runtime\wrap.js:6:10), <anonymous>:74:139) at Object.exports.renderFile ...\Learn Javascript\Flashcards\node_modules\pug\lib\index.js:428:38) at Object.exports.renderFile (...\Learn Javascript\Flashcards\node_modules\pug\lib\index.js:418:21) at View.exports.__express [as engine] (...\Learn Javascript\Flashcards\node_modules\pug\lib\index.js:465:11) at View.render ...\Learn Javascript\Flashcards\node_modules\express\lib\view.js:128:8) at tryRender (...\Learn Javascript\Flashcards\node_modules\express\lib\application.js:640:10) at Function.render (...\Learn Javascript\Flashcards\node_modules\express\lib\application.js:592:3)
at ServerResponse.render (...\Learn Javascript\Flashcards\node_modules\express\lib\response.js:966:7)
[card.pug]
const express = require('express');
const app = express();
const colors = [ 'red', 'orange', 'yellow', 'green', 'blue', 'purple' ];
app.set('view engine', 'pug');
app.get('/', (req, res) => {
res.render('index');
});
app.get('/about', (req, res) => {
res.render('about');
});
app.get('/cards', (req, res) => { res.render('card', { prompt: "Who is buried in Grant's tomb?", hint: "Think about whose tomb it is." }); });
app.listen(3000, () => { console.log('App is running on port 3000!') });
Charles Sharpe
2,013 PointsI forgot to pass the var to the /cards route.
Reid Young
Courses Plus Student 14,209 Pointscolors}); });
has extraneous "});" in it
miikis
44,957 Pointsmiikis
44,957 PointsCan you post the contents of your
card.pugfile, or yourcards.pugfile? Your issue might be due to how you're handling colors in your templating code, or it could just be that cards/card routing typo.