Thoughts on React

React is the next big thing…

No I am just kidding…

It is a great idea and is way smaller than Angular. However, after sometime, I feel like it was designed to present data, not editing data. It is extremely painful to change a deeply nested component, and ask the root component to respond to it.

Here are some interesting ideas on how to solve the problem.

One is with event bus. Coming from Backbone, I almost don’t know what to do when I don’t have any event bus…

This is exactly the problem we’ve been running into building a medium sized interactive app in React. The management of data flow and state changes through the component hierarchy with callbacks can get quite complex, and you end up writing lots of callback boilerplate. So we’ve ended up rolling an event system that sits alongside the React components, and a lot of our app’s interactivity is managed through the event system.” quoted from this url: https://news.ycombinator.com/item?id=7671848

The other is with callbacks from the child component to its parent. This might be the recommended way from the React team, but I don’t like it because you quickly accumulate so many boilerplate code …

I think this is the most underdocumented part of React right now. The suggested way to communicate between components is to simply set props when communicating from parent to child and to pass callbacks through props when communicating from child to parent.” quoted from this url: http://stackoverflow.com/questions/20795323/editing-a-rich-data-structure-in-react-js

The third one is this thing called the flux system architecture , which I don’t quite understand. It seems to be the same as the event bus system, but I am not 100% sure.

It works well with React because the objects are passed directly into React views for consumption, where they cannot be modified by the views themselves. When a view wants to change a piece of data, (perhaps based on user input), the view informs the store that something has changed, which will validate the input and then propagate the change out to the rest of the application. In this way, you never worry about incremental state mutation, or incremental updates, and every change that happens to the system (whether it comes from user input, an ajax response from the server, or anything else) goes through the exact same flow (which handles validation, batching, persisting, etc).

We think of Flux as complementary to React. When you build your views in React, something needs to track the data and interact with the server (fetching more data or performing writes). Flux prescribes how to structure those pieces in a way that makes it easy to reason about the data flow, even when the application needs are inherently complicated.
As one example, we’ve found that using models tends to push application logic into the view layer, rather than keeping it close to the data layer. With centralized stores, all changes are expressed by the view as the intent to take an action. A payload sent to the stores could indicate that the user wants to mark a message as read. The stores then internally make all the changes that the action implies – marking the message as read and decrementing the unread count on the thread – rather than making the view know about that bookkeeping.
Moving this application logic into the central store layer makes it more testable, and it becomes easier to refactor the internal representation without breaking existing views. We also get a nice separation of concerns between the views and the data layer, something that React already encourages.”

An example with flux can be found here: https://github.com/facebook/react/tree/master/examples/todomvc-flux

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Express with Handlebars

There are a lot ways to set up a project. However, I can’t find a plug and play solution for my particular set up, express.js + stylus + handlebars.

Express cli without yeoman:

http://expressjs.com/

express --sessions --css stylus --ejs myapp

Express yeoman generators:

https://github.com/petecoop/generator-express

https://github.com/ngenerio/generator-express-simple

Express handlebar modules:

https://github.com/ericf/express3-handlebars

https://github.com/barc/express-hbs

https://github.com/donpark/hbs

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Execcommand formatblock headings in IE

Spend hours of trying to figure out why

document.execCommand('formatBlock',false,'h1');

is not working.

It is because you need to do this for ie

document.execCommand('formatBlock',false,'<h1>');

Two refs:

1. http://stackoverflow.com/questions/10741831/execcommand-formatblock-headings-in-ie

2.  http://help.dottoro.com/larpvnhw.php

String that specifies the name of the element. In Internet Explorer, the name of the element must be placed between tag delimiters (such as “<H1>”). Firefox, Opera, Google Chrome and Safari support all block elements, Internet Explorer supports only the h1 – h6address and preelements.

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Yammer hackathon

Did my very first Hackathon with Guy. Didn’t win anything but it was a really cool experience. The winning app is a visualization app, similar to http://www.wolframalpha.com/facebook/.

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Coffee surfing

Coffee is good, wifi is slowwwww. It is surprising busy that I can only find a small desk by the window.

At the new Philz coffee in South San Francisco.

2248 Westborough Blvd
Ste 306
South San Francisco, CA 94080

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