// the old way of updating UI based on AJAX $.ajax({ url: "foo.com/users", }).done(function(data) { data.forEach(function(item) { $(item.id).html(item.title); }); });
Then and now Page refreshes Server side rendering Manual UI updates Client side MVC
AJAX/SPA Client side templating Reactive UIs Web Components Flux
{currentPage}
Model
Controller
View
Widget User Comments
// imagine: the inside of 'custom tags' // widget.js var Widget = createComponent({ render: function() { return (
{this.data.name}
); } }); // index.html
What is React.js? A Reactive, Component Based JavaScript UI Library
var Hello = React.createClass({ render: function() { return
Unlike Angular and Ember, React only provides the V in MVC
View
View
View
Controller
Controller
Controller
Model
Model
Model
"Store" A slight but very important abstraction on top of a "model"
Post Store Action View (Component)
createPost editPost addComment favorite
Event + Read Data
This cleanly splits view logic and storage logic, but doesn't help MVC spaghettification
View
Store
Actions
View
Store Dispatcher
Events
View
Store
View
Store Read state
// from the create view Dispatcher.dispatch({ actionType: CREATE_WIDGET, name: 'My Widget', size: 10 }); // in the widget store function onAction(action) { switch(action.actionType) { case CREATE_WIDGET: // write to storage, send to server etc. this.emit('change'); break; } }
Points to remember: A component knows nothing about its environment except what it receives via props
this.state = your data (private) this.props = others' data (read-only)
A component should know nothing about storage logic (only view logic)
A store should know nothing about display logic (only storage logic)
The only way to mutate the store is by sending it actions
Components should listen to change events of relevant stores and re-read data on change
the old way of updating UI based on AJAX. $.ajax({ url: "foo.com/users",. }).done(function(data) { data.forEach(function(item) {. $(item.id).html(item.title);. }); }); ...
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