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Building User
Interfaces With
React
Building
consistent user
interfaces is hard
React
React aims to be
simple
React is
declarative
Components
Not templates
Components can
be composed to
build complex UIs
Break down the user
interface into components
A little about JSX
JSX Gotchas
Component State
Component Lifecycle
1. Mounting
2. Updating
3. Unmounting
Ownership,
not parent
Data on the screen
JS is not reactive
DOM is inherently
stateful
Data Binding is a
polyfill for reactive
JS and DOM
Virtual DOM
React to events
Autobinding
Event delegation
React Add-ons
http://bit.ly/react-docs
http://bit.ly/react-contrib
Documentation
Contribute
http://bit.ly/react-tools
Tooling
http://bit.ly/rethink-practices
Watch
Questions?

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Editor's Notes

  1. React is a library for building user interfaces with JavaScript.
  2. Simple: express how the app should look at any given point in time, React will manage all UI changes when the data changes A lot of people use React as the V in MVC. Makes no assumptions about the rest of the technology stack. Declarative: React hits a conceptual “refresh” button and updates the changed parts
  3. Components – React uses a full-features programming language to render views. Advantages over templates for a few reasons: - JavaScript is powerful and flexible. It’s a lot easier to add abstractions. Demo: Simple component var Item = React.createClass({ render: function() { return React.DOM.li(null, this.props.itemName); } }); var ItemList = React.createClass({ render: function() { var items = this.props.items.map(function(item) { return Item({ itemName: item }); }); return React.DOM.ul({className: "items"}, items); } }); var items = ["Item 1", "Item 2", "Item 3"]; React.renderComponent(ItemList({ items: items}), document.body);
  4. Product Image Product Title Upsell Options Product Review Product specification Trade In Product Description Product Category Link
  5. JSX is a JavaScript XML syntax that makes writing React components a little bit easier - Helps visualize the DOM - Simple syntactic transform - Designers are comfortable making changes Transformed to native JavaScript JSX SAMPLE
  6. HTML Entities - it escapes HTML entities to help prevent XSS attacks - Insert the UTF-8 character in the code - String.fromCharCode - insert raw HTML (dangerouslySetInnerHTML) HTML Attributes - React only supports attributes native to HTML spec - prefix them with data- in order to get support - aria attributes are supported
  7. Most components should be stateless and just render itself using props Demo: Component with state What belongs in component state? - data that can be manipulated via a component’s event handlers, user interactions, etc. - when building a component think about the minimal possible representation of it’s state and store only those properties in state What does not belong in component state? - computed data (this.state.listItems.length + ‘ list items’ - put them in your render() - React components - Duplicated data from props - unless you need to know it’s previous value
  8. Three phases: Mounting getInitialState – set the state of a component componentWillMount – invoked immediately before mounting componentDidMount – invoked immediately after mounting Updating componentWillReceiveProps – invoked when a mounted component receives new props shouldComponentUpdate – invoked when a component decides whether any changes warrant update to the DOM (useful to optimize components) componentWillUpdate – invoked immediately before updating occurs componentDidUpdate – invoked immediately after updating occurs Unmounting componentWillUnmount – invoked immediately before a component is unmounted and destroyed. Used for clean up
  9. If component X is created in component Y’s render() method it is said that X is owned by Y. props are always consistent to what it’s parent sets them to Look more into children Demo
  10. Traditionally JS frameworks show data by binding a model to the UI. Knockout, Ember, Backbone follow a Key, Value Observation paradigm for displaying data use observables and computed properties to bind data directly to the UI * When data changes, it is bound to an underlying model that updates AngularJS uses dirty checking via $scope, $watch, and $directives
  11. In traditional data-binding, you have to see what data has changed and imperatively make changes to the DOM to keep it up to date. Even AngularJS which provides a declarative interface via directives and data-binding requires a linking function to manually update the DOM.
  12. How many DOM manipulations would occur with an Key Value Observation when the underlying model changes? - 3 - One to remove New York, Two to add Chicago and Seattle
  13. A less leaky polyfill for reactive JavaScript and DOM
  14. How many DOM manipulations would result using the Virtual DOM? - 1 to add a new element for Seattle How React’s virtual dom works: Whenever anything may have changed, re-render everything to a virtual DOM representation Diff the previous representation with the next one Only update the real DOM with the difffs
  15. Synthetic events – React has its own event system that ensures that events behave the same in all browsers including IE8 and above. Consistent with the W3C spec AutoBinding: All methods are automatically bound to the context of the component. No need to call .bind() to get the ‘this’ keyword to play nice. Event Delegation: no events are attached directly to DOM nodes. When React starts, it listens for all events at the top level using a single event listener. On component mount/unmount events are added to an internal mapping and are dispatched via the mapping. This is really fast: http://davidwalsh.name/event-delegate
  16. ReactTestUtils Simulate – simulate an event dispatch on a DOM node ad pass eventData. Probably the most useful utility in the React addons