Edit Global array in Express

Question

I want to change one item from array from app locals variable and i am not sure how to do this

Here is what i have set as global

app.locals.products=[{name: 'a',url: '/a' },
    {name: 'b',url: '/b' },
    {name: 'c',url: '/c' },...

I want to edit them and set active product from routes and do something like this

    products:[{name: 'a',url: '/a' active:true}],

But when i do this it will remove all the other items and set only the product the one i wrote. Is there a way to edit just the one i need and leave all the rest unchanged?

you need to find index of product ... products[index].active = true — David
– David, Commented Mar 15, 2017 at 8:38

paqash · Accepted Answer · 2017-03-15 08:40:16Z

2

You can use the array find function to find a specific item in the products array and edit it.

function setActive(name) {

  var element = products.find(function(product) {
    return product.name === name;
  });

  if (element) {
    element.active = true;
  }
}

This function takes the name variable, checks if it exists in the product array and sets it to active. You might want to throw an exception if it doesn't.

Usage:

setActive('a');

answered Mar 15, 2017 at 8:40

paqash

2,3141 gold badge20 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

10 Comments

Bill Over a year ago

i get error 500... i used it in routes inside router get.. Could this be because i have spaces?

Bill Over a year ago

here is the global array

app.locals.products=[{name: 'Window & residential door systems',url: '/en/products/window-residential-door-systems' },         {name: 'Sliding systems',url: '/en/product/sliding_system' },         {name: 'Shutter systems',url: '/en/product/shutter_system' },         {name: 'Sheets',url: '/en/product/sheets' },         {name: 'Building profiles & systems',url: '/en/product/profiles&systems' }];

Bill Over a year ago

and this is the routes

var express = require('express'); var router = express.Router(); router.get('/', function(req, res, next) {   var url = req.originalUrl;   function setActive(name) {   var element = products.find(function(product) {     return product.name === name;   });   if (element) {     element.active = true;   }}   setActive('Window & residential door system');   res.render('index', {       title: 'The premium brand',       pageurl: url,       welcome: true      }); }); module.exports = router;

paqash Over a year ago

Did you put the function definition inside the router.get function? it should be outside of it, of course, and only the setActive call should be inside .. the spaces should be no problem

Bill Over a year ago

Ok i have found what was the problem, i had to request the locals variable first and also place all the code including the setActive outside from the render...

function setActive(name) {var element = req.app.locals.products.find(function(product) {return product.name === name;});       if (element) {element.active = true;}}       setActive('a');

thanks for the help!

|

Collectives™ on Stack Overflow

Edit Global array in Express

1 Answer 1

10 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

10 Comments

Your Answer

Sign up or log in

Post as a guest

Related