react 0.6.0 
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workiva.comBindings of the ReactJS library for building interactive interfaces.
#Dart wrapper library for facebook/react
##Getting started
If you are not familiar with React library read react tutorial first.
To integrate in Dart project add dependency react to pubspec.yaml.
Include native react library (provided with this library for compatibility reasons) to index.html and create element where you'll mount the react component you'll create.
<html>
<head>
<script async src="packages/react/react.js"></script>
<script async type="application/dart" src="your_app_name.dart"></script>
<script async src="packages/browser/dart.js"></script>
</head>
<body>
<div id="content">Here will be react content</div>
</body>
</html>
Initialize React in our Dart application. Mount simple component into '#content' div.
import 'dart:html';
import 'package:react/react_client.dart' as reactClient;
import 'package:react/react.dart';
main() {
//this should be called once at the begging of application
reactClient.setClientConfiguration();
var component = div({}, "Hello world!");
render(component, querySelector('#content'));
}
Inverse method to rendering component is unmountComponentAtNode
unmountComponentAtNode(querySelector('#content'));
##Using browser native elements
If you are familiar with React (without JSX extension) React-dart shouldn't surprise you much. All elements are defined as
functions that take props as first argument and children as optional second argument. props should implement Map and children is either one React element or List with multiple elements.
div({"className": "somehing"}, [
h1({"style": {"height": "20px"}}, "Headline"),
a({"href":"something.com"}, "Something"),
"Some text"
])
For event handlers you must provide function that take SyntheticEvent (defined in this library).
div({"onClick": (SyntheticMouseEvent e) => print(e)})
##Defining custom elements
Define custom class that extends Component and implements at least render.
import 'package:react/react.dart';
class MyComponent extends Component {
render() => div({}, "MyComponent");
}
Register this class so React can recognize it.
var myComponent = registerComponent(() => new MyComponent());
Use this registered component similarly as native elements.
render(myComponent({}), querySelector('#content'));
// or
div({}, [
myComponent({})
])
Warning: registerComponent should be called only once per component and lifetime of application.
Custom element with props #
var myComponent = registerComponent(() => new MyComponent());
class MyComponent extends Component {
render() => div({}, props['text']);
}
myComponent({"text":"Somehting"})
####Creating components with richer interface than just props and children and with type control
typedef MyComponentType({String headline, String text});
var _myComponent = registerComponent(() => new MyComponent())
MyComponentType myComponent = ({headline, text}) =>
_myComponent({'headline':headline, 'text':text});
class MyComponent extends Component {
get headline => props['headline'];
get text => props['text'];
render() =>
div({},[
h1({}, headline),
span({}, text),
]);
}
void main() {
reactClient.setClientConfiguration();
render(
myComponent(headline: "My custom headline",
text: "My custom text"),
querySelector('#content')
);
}
Geocodes Example #
For more robust example take a look at example/geocodes/geocodes.dart.
Life-cycle methods of a component #
These are quite similar to React life-cycle methods, so refer to React tutorial for further explanation/spec. Their signatures in Dart are as:
class MyComponent extends Component {
void componentWillMount() {}
void componentDidMount(/*DOMElement*/rootNode) {}
void componentWillReceiveProps(newProps) {}
bool shouldComponentUpdate(nextProps, nextState) => true;
void componentWillUpdate(nextProps, nextState) {}
void componentDidUpdate(prevProps, prevState, /*DOMElement */ rootNode) {}
void componentWillUnmount() {}
Map getInitialState() => {};
Map getDefaultProps() => {};
render() => div({}, props['text']);
}
Testing using React Test Utilities #
lib/react_test_utils.dart is a Dart wrapper for the React TestUtils library allowing for tests to be made for React components in Dart.
Here is an example of how to use React TestUtils within a Dart test.
import 'package:unittest/unittest.dart';
import 'package:react/react.dart' as react;
import 'package:react/react_client.dart' as reactClient;
import 'package:react/react_test_utils.dart' as reactTestUtils;
class MyTestComponent extends react.Component {
getInitialState() => {'text': 'testing...'};
render() {
return react.div({}, [
react.button({'onClick': (e) => setState({'text': 'success'})}),
react.span({'className': 'spanText'}, state['text'])
]);
}
}
var myTestComponent = react.registerComponent(() => new MyTestComponent());
void main() {
reactClient.setClientConfiguration();
test('should click button and set span text to "success"', () {
var component = reactTestUtils.renderIntoDocument(myTestComponent({}));
// Find button using tag name
var buttonElement = reactTestUtils.findRenderedDOMComponentWithTag(
component, 'button');
// Find span using class name
var spanElement = reactTestUtils.findRenderedDOMComponentWithClass(
component, 'spanText');
var buttonNode = reactTestUtils.getDomNode(buttonElement);
var spanNode = reactTestUtils.getDomNode(spanElement);
// Span text should equal the initial state
expect(spanNode.text, equals('testing...'));
// Click the button and trigger the onClick event
reactTestUtils.Simulate.click(buttonNode);
// Span text should change to 'success'
expect(spanNode.text, equals('success'));
});
}
To test the Dart wrapper, take a look at test/react_test_utils_test.dart.
Metadata
Publisher
Metadata
Bindings of the ReactJS library for building interactive interfaces.
License
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