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A Kanban style collaboration app built with Node.js/Express.js, React/Redux, and MongoDB.

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Reaction App

DataBase Setup

  1. Create mongoDB account - https://account.mongodb.com/account/register
  2. Create AWS cluster
  3. Under Security tab, click Database Access, and on the right add new database user. After you enter username and password, click add user at the bottom right corner.
  4. Under Security tab, click Network Access, and whitelist your IP address.
  5. Once your cluster is created, under Clusters tab, click connect and copy the connection string which will look something like this mongodb+srv://<username>:<password>@cluster0.ioku4.mongodb.net/myFirstDatabase?retryWrites=true&w=majority. Instead of <username> there will be your username, and you will need to replace <password> with your password.
  6. Finally, inside your project folder, cd into server, create new file .env and enter DB=<paste the string from above here>. It will look similar to this DB=mongodb+srv://srdjan:[email protected]/reaction?retryWrites=true&w=majority.

Running the app

While in the server directory, run npm run dev to start the live server. The live server will watch for changes to files in the src directory and reload the page when they're changed.

Viewing Static Version of the App

While developing the app, you can take a look at the static pages that you'll eventually convert into a dynamic application. To do so, visit http://localhost:3000/ui in the browser.

Developing the app

The starting point of the application is the /client/src/index.js file. That's where the root component of the application - Application - is rendered to the DOM. You can add new components to the /client/src/components folder.

Calculation of item positions

  • If the item is the first to be created in the group, it gets a position of 65535.
  • If the item is inserted at the beginning of the group, the position becomes half of the previously-first item’s position.
  • If the item is inserted at the end of the list, the position becomes the previously-last item’s position plus 65536
  • If the item is inserted between two other items, the position becomes (itemBefore.position + itemAfter.position) / 2.
  • Positions are floats with a high precision (10 digits or so)

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A Kanban style collaboration app built with Node.js/Express.js, React/Redux, and MongoDB.

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