Custom programmable widgets in Draft.js (plugin) - javascript

As an example of what I'd like to do, in Draft.js I'd like to allow the users to include a slideshow of images in the page that could change externally later on. So if there is a slideshow defined in my app, the user could select that slideshow to put in their page, and if the images were changed later then they would automatically update on the page. A visual representation in the editor would a nice-to-have as well. Am I asking too much or is this possible in Draft.js?

It never fails. I post a question and almost immediately I find something that might answer my question. Draft.js has what is called "decorators", which are currently documented here: https://draftjs.org/docs/advanced-topics-decorators.html
Basically you'd create a series of decorators using functions / components. Strategy takes a function, component is obvious.
const compositeDecorator = new CompositeDecorator([
{
strategy: handleStrategy,
component: HandleSpan,
},
{
strategy: hashtagStrategy,
component: HashtagSpan,
},
]);
Strategies can be defined using regexes. This enables you to write your own syntax or use that of a template engine's for embedding widgets. The strategies in the documentation are a fairly good example:
// Note: these aren't very good regexes, don't use them!
const HANDLE_REGEX = /\#[\w]+/g;
const HASHTAG_REGEX = /\#[\w\u0590-\u05ff]+/g;
function handleStrategy(contentBlock, callback, contentState) {
findWithRegex(HANDLE_REGEX, contentBlock, callback);
}
function hashtagStrategy(contentBlock, callback, contentState) {
findWithRegex(HASHTAG_REGEX, contentBlock, callback);
}
function findWithRegex(regex, contentBlock, callback) {
const text = contentBlock.getText();
let matchArr, start;
while ((matchArr = regex.exec(text)) !== null) {
start = matchArr.index;
callback(start, start + matchArr[0].length);
}
}
And then here are the components:
const HandleSpan = (props) => {
return <span {...props} style={styles.handle}>{props.children}</span>;
};
const HashtagSpan = (props) => {
return <span {...props} style={styles.hashtag}>{props.children}</span>;
};

Related

use of conventional Javascript classes for models in React

Is it possible to use conventional Javascript classes in models (in a MVC paradigm) using React instead of using Redux or contexts & reducers that seem to undermine reusability? If so, how can we effectively 'subscribe' to actions that change data in these objects so that views (i.e. React components) are rendered effectively?
The subscription logic is on you to figure out yourself. React doesn't offer any mechanism that can be "borrowed" in other classes. But event-oriented programming in Javascript is, of course, nothing new. So an event-emitter like pattern would work. So here is one example (not tested, but it should give you the idea):
class MyClass {
data = {};
constructor(onTick) {
setInterval(() => {
const now = new Date();
this.data.time = now;
this.data.tillChristmas = (new Date('2021-12-25')) - now;
onTick && onTick(this);
}, 10 * 1e3);
}
}
const MyComp = () => {
const [data, setData] = useState({});
useEffect(() => {
new MyClass(myclass => {
setData(myclass.data);
});
}, []);
return <pre>
{JSON.stringify(data, true, 2)}
</pre>;
// of course, you could present the data in more interesting ways, too.
};

Is it safe to customize / override parts of a 3rd Party React component using extend? (Ignore "composition over inheritance" VS changing source code?)

I'm working with this 3rd party dropdown - primereact - and it's component primereact/multiselect ... I need everything to work exactly as the original developer wrote, except a few functions. These functions are not accessible via props. I'm wondering if there is a "best practices" way.
The problem with the original code -- there is a bug in the "Select All" checkbox, and I want to change the function of the close icon; it is redundant in my application.
These are the only two options I could think of:
Copy entire source code of 3rd party item, modify it directly, and then remove the dependency. This kind of feels like stealing to me, though.
Extend the component and override the functions
Here is the 3rd party source code:
https://bit.dev/primefaces/primereact/multiselect/~code#multiselect/MultiSelect.js
and here is my code:
import React from 'react';
import { MultiSelect } from 'primereact/multiselect';
import {customMultiSelectSearchHeader} from './searchSafeMultiSelect.css';
class SearchSafeMultiSelect extends MultiSelect {
constructor(props) {
super(props);
this.state = {
filter: ''
};
// Binds certain functions to NEW class, instead of __proto__
this.hasFilter = this.hasFilter.bind(this);
this.onClick = this.onClick.bind(this);
this.onOptionClick = this.onOptionClick.bind(this);
this.onOptionKeyDown = this.onOptionKeyDown.bind(this);
this.onFocus = this.onFocus.bind(this);
this.onBlur = this.onBlur.bind(this);
this.onFilter = this.onFilter.bind(this);
this.onCloseClick = this.onCloseClick.bind(this);
this.onToggleAll = this.onToggleAll.bind(this);
}
// Changes icon next to search bar from X to trash can.
originalRenderHeader = this.renderHeader;
renderHeader = (items) => {
const header = this.originalRenderHeader(items);
return (
<div className={customMultiSelectSearchHeader}>
{header}
</div>
);
}
// Makes clicking the Trash (previously X) icon close the dropdown AND clear selection.
onCloseClick = (event) => {
this.hide();
this.updateModel(event.originalEvent, []);
event.preventDefault();
event.stopPropagation();
}
// Fixes bug in dependency - ALL box is checked if all visible options are selected.
isAllChecked = (visibleOptions) => {
if(this.hasFilter()) {
return this.props.value && visibleOptions && visibleOptions.length
&& this.filterOptions(this.props.options).find(visible => this.props.value.indexOf(this.getOptionValue(visible) == -1) == undefined;
}
else {
return this.props.value && this.props.options && (this.props.value.length === this.props.options.length);
}
}
}
export default SearchSafeMultiSelect;
CSS file ./searchSafeMultiSelect.css:
.customMultiSelectSearchHeader button span::before{
content: "\e93d" !important;
}
package.json (sets primereact version to exactly 5.0.1 incase they update, my code should stay the same)
"primereact": "5.0.1",
It works as expected. I am just wondering if I'm doing something taboo over here. I looked up many guides, but didn't see anyone online modifying dependencies this way. That is making me doubt if my approach is safe.
Edit:
Yes, I've read many things about "Composition over Inheritance" here, but in the case of 3rd party components, the only way I can change the base's composition is by altering the dependency's source code directly. So, I feel like I'm stuck between 2 bad options -- changing the source code or using inheritance.

Set Custom Defined Type in DraftJS

I'm curious if we can define our own block type instead of using one from DRAFTBLOCKTYPE.
Currently I'm playing with draft-wysiwyg which uses plugin named draft-image-plugin. The problem is that I've to pass the block-image as the type of the block instead of atomic to make the plugin working.
Actually, I had tried to use the solution from this where I override the plugin's type to atomic. But it affects other blocks with atomic type on the application where I can't create my own blockRendererFn since the blockRenderer is 'swallowed' by that plugin's blockRenderer.
To set the block type to atomic, I can easily achieved it by:
AtomicBlockUtils.insertAtomicBlock(
editorState,
entityKey,
' '
)
How to set the block type to any custom defined type such as block-image or block-table? Is that even possible?
Yes, that's possible, and you have a few different options. Here are some I know of:
If you have control over the component that renders blocks of type atomic, it would probably be easiest to add your new type as an entity to those blocks.
If that's not an option, it get's a bit more cumbersome. AtomicBlockUtils is actually just a module made to help people create media (atomic) blocks easier (even though more utility functions will probably be added in the future). If you want the exact same behavior, but with a different type, you could copy that module and just exchange 'atomic' with something else (e.g. 'block-image' or a variable to make it more generic/resuable).
The technique they use is basically to create a selection of an empty block, and then use the Modifier.setBlockType() function to give it a new block type:
const asAtomicBlock = DraftModifier.setBlockType(
afterSplit, // ContentState
insertionTarget, // SelectionState
'atomic' // your custom type
);
In this example, the author has created his own version, called addNewBlock() (it doesn't work exactly like the one in AtomicBlockUtils though):
/*
Adds a new block (currently replaces an empty block) at the current cursor position
of the given `newType`.
*/
const addNewBlock = (editorState, newType = Block.UNSTYLED, initialData = {}) => {
const selectionState = editorState.getSelection();
if (!selectionState.isCollapsed()) {
return editorState;
}
const contentState = editorState.getCurrentContent();
const key = selectionState.getStartKey();
const blockMap = contentState.getBlockMap();
const currentBlock = getCurrentBlock(editorState);
if (!currentBlock) {
return editorState;
}
if (currentBlock.getLength() === 0) {
if (currentBlock.getType() === newType) {
return editorState;
}
const newBlock = currentBlock.merge({
type: newType,
data: getDefaultBlockData(newType, initialData),
});
const newContentState = contentState.merge({
blockMap: blockMap.set(key, newBlock),
selectionAfter: selectionState,
});
return EditorState.push(editorState, newContentState, 'change-block-type');
}
return editorState;
};
So if you want to e.g. create a block of type 'block-image', with a src attribute, you can use this function like so:
const newEditorState = addNewBlock(this.state.editorState, 'block-image', { src: 'https://...' })
this.setState({ editorState: newEditorState })
Update:
If you add a new type, you also need to add it to your editor's blockRenderMap:
import { Map } from 'immutable'
<Editor
// editor props
blockRenderMap={Map({
['unstyled']: {
element: 'div'
},
['block-image']: {
element: 'div' // or whatever element you want as a wrapper
},
// all your other block types
})}
/>

How can I communicate between related react components?

I just got started with ReactJS and am a little stuck on a problem that I have.
My application is essentially a list with filters and a button to change the layout.
At the moment I'm using three components: <list />, < Filters /> and <TopBar />, now obviously when I change settings in < Filters /> I want to trigger some method in <list /> to update my view.
How can I make those 3 components interact with each other, or do I need some sort of global data model where I can just make changes to?
The best approach would depend on how you plan to arrange those components. A few example scenarios that come to mind right now:
<Filters /> is a child component of <List />
Both <Filters /> and <List /> are children of a parent component
<Filters /> and <List /> live in separate root components entirely.
There may be other scenarios that I'm not thinking of. If yours doesn't fit within these, then let me know. Here are some very rough examples of how I've been handling the first two scenarios:
Scenario #1
You could pass a handler from <List /> to <Filters />, which could then be called on the onChange event to filter the list with the current value.
JSFiddle for #1 →
/** #jsx React.DOM */
var Filters = React.createClass({
handleFilterChange: function() {
var value = this.refs.filterInput.getDOMNode().value;
this.props.updateFilter(value);
},
render: function() {
return <input type="text" ref="filterInput" onChange={this.handleFilterChange} placeholder="Filter" />;
}
});
var List = React.createClass({
getInitialState: function() {
return {
listItems: ['Chicago', 'New York', 'Tokyo', 'London', 'San Francisco', 'Amsterdam', 'Hong Kong'],
nameFilter: ''
};
},
handleFilterUpdate: function(filterValue) {
this.setState({
nameFilter: filterValue
});
},
render: function() {
var displayedItems = this.state.listItems.filter(function(item) {
var match = item.toLowerCase().indexOf(this.state.nameFilter.toLowerCase());
return (match !== -1);
}.bind(this));
var content;
if (displayedItems.length > 0) {
var items = displayedItems.map(function(item) {
return <li>{item}</li>;
});
content = <ul>{items}</ul>
} else {
content = <p>No items matching this filter</p>;
}
return (
<div>
<Filters updateFilter={this.handleFilterUpdate} />
<h4>Results</h4>
{content}
</div>
);
}
});
React.renderComponent(<List />, document.body);
Scenario #2
Similar to scenario #1, but the parent component will be the one passing down the handler function to <Filters />, and will pass the filtered list to <List />. I like this method better since it decouples the <List /> from the <Filters />.
JSFiddle for #2 →
/** #jsx React.DOM */
var Filters = React.createClass({
handleFilterChange: function() {
var value = this.refs.filterInput.getDOMNode().value;
this.props.updateFilter(value);
},
render: function() {
return <input type="text" ref="filterInput" onChange={this.handleFilterChange} placeholder="Filter" />;
}
});
var List = React.createClass({
render: function() {
var content;
if (this.props.items.length > 0) {
var items = this.props.items.map(function(item) {
return <li>{item}</li>;
});
content = <ul>{items}</ul>
} else {
content = <p>No items matching this filter</p>;
}
return (
<div className="results">
<h4>Results</h4>
{content}
</div>
);
}
});
var ListContainer = React.createClass({
getInitialState: function() {
return {
listItems: ['Chicago', 'New York', 'Tokyo', 'London', 'San Francisco', 'Amsterdam', 'Hong Kong'],
nameFilter: ''
};
},
handleFilterUpdate: function(filterValue) {
this.setState({
nameFilter: filterValue
});
},
render: function() {
var displayedItems = this.state.listItems.filter(function(item) {
var match = item.toLowerCase().indexOf(this.state.nameFilter.toLowerCase());
return (match !== -1);
}.bind(this));
return (
<div>
<Filters updateFilter={this.handleFilterUpdate} />
<List items={displayedItems} />
</div>
);
}
});
React.renderComponent(<ListContainer />, document.body);
Scenario #3
When the components can't communicate between any sort of parent-child relationship, the documentation recommends setting up a global event system.
There are multiple ways to make components communicate. Some can be suited to your usecase. Here is a list of some I've found useful to know.
React
Parent / Child direct communication
const Child = ({fromChildToParentCallback}) => (
<div onClick={() => fromChildToParentCallback(42)}>
Click me
</div>
);
class Parent extends React.Component {
receiveChildValue = (value) => {
console.log("Parent received value from child: " + value); // value is 42
};
render() {
return (
<Child fromChildToParentCallback={this.receiveChildValue}/>
)
}
}
Here the child component will call a callback provided by the parent with a value, and the parent will be able to get the value provided by the children in the parent.
If you build a feature/page of your app, it's better to have a single parent managing the callbacks/state (also called container or smart component), and all childs to be stateless, only reporting things to the parent. This way you can easily "share" the state of the parent to any child that need it.
Context
React Context permits to hold state at the root of your component hierarchy, and be able to inject this state easily into very deeply nested components, without the hassle to have to pass down props to every intermediate components.
Until now, context was an experimental feature, but a new API is available in React 16.3.
const AppContext = React.createContext(null)
class App extends React.Component {
render() {
return (
<AppContext.Provider value={{language: "en",userId: 42}}>
<div>
...
<SomeDeeplyNestedComponent/>
...
</div>
</AppContext.Provider>
)
}
};
const SomeDeeplyNestedComponent = () => (
<AppContext.Consumer>
{({language}) => <div>App language is currently {language}</div>}
</AppContext.Consumer>
);
The consumer is using the render prop / children function pattern
Check this blog post for more details.
Before React 16.3, I'd recommend using react-broadcast which offer quite similar API, and use former context API.
Portals
Use a portal when you'd like to keep 2 components close together to make them communicate with simple functions, like in normal parent / child, but you don't want these 2 components to have a parent/child relationship in the DOM, because of visual / CSS constraints it implies (like z-index, opacity...).
In this case you can use a "portal". There are different react libraries using portals, usually used for modals, popups, tooltips...
Consider the following:
<div className="a">
a content
<Portal target="body">
<div className="b">
b content
</div>
</Portal>
</div>
Could produce the following DOM when rendered inside reactAppContainer:
<body>
<div id="reactAppContainer">
<div className="a">
a content
</div>
</div>
<div className="b">
b content
</div>
</body>
More details here
Slots
You define a slot somewhere, and then you fill the slot from another place of your render tree.
import { Slot, Fill } from 'react-slot-fill';
const Toolbar = (props) =>
<div>
<Slot name="ToolbarContent" />
</div>
export default Toolbar;
export const FillToolbar = ({children}) =>
<Fill name="ToolbarContent">
{children}
</Fill>
This is a bit similar to portals except the filled content will be rendered in a slot you define, while portals generally render a new dom node (often a children of document.body)
Check react-slot-fill library
Event bus
As stated in the React documentation:
For communication between two components that don't have a parent-child relationship, you can set up your own global event system. Subscribe to events in componentDidMount(), unsubscribe in componentWillUnmount(), and call setState() when you receive an event.
There are many things you can use to setup an event bus. You can just create an array of listeners, and on event publish, all listeners would receive the event. Or you can use something like EventEmitter or PostalJs
Flux
Flux is basically an event bus, except the event receivers are stores. This is similar to the basic event bus system except the state is managed outside of React
Original Flux implementation looks like an attempt to do Event-sourcing in a hacky way.
Redux is for me the Flux implementation that is the closest from event-sourcing, an benefits many of event-sourcing advantages like the ability to time-travel. It is not strictly linked to React and can also be used with other functional view libraries.
Egghead's Redux video tutorial is really nice and explains how it works internally (it really is simple).
Cursors
Cursors are coming from ClojureScript/Om and widely used in React projects. They permit to manage the state outside of React, and let multiple components have read/write access to the same part of the state, without needing to know anything about the component tree.
Many implementations exists, including ImmutableJS, React-cursors and Omniscient
Edit 2016: it seems that people agree cursors work fine for smaller apps but it does not scale well on complex apps. Om Next does not have cursors anymore (while it's Om that introduced the concept initially)
Elm architecture
The Elm architecture is an architecture proposed to be used by the Elm language. Even if Elm is not ReactJS, the Elm architecture can be done in React as well.
Dan Abramov, the author of Redux, did an implementation of the Elm architecture using React.
Both Redux and Elm are really great and tend to empower event-sourcing concepts on the frontend, both allowing time-travel debugging, undo/redo, replay...
The main difference between Redux and Elm is that Elm tend to be a lot more strict about state management. In Elm you can't have local component state or mount/unmount hooks and all DOM changes must be triggered by global state changes. Elm architecture propose a scalable approach that permits to handle ALL the state inside a single immutable object, while Redux propose an approach that invites you to handle MOST of the state in a single immutable object.
While the conceptual model of Elm is very elegant and the architecture permits to scale well on large apps, it can in practice be difficult or involve more boilerplate to achieve simple tasks like giving focus to an input after mounting it, or integrating with an existing library with an imperative interface (ie JQuery plugin). Related issue.
Also, Elm architecture involves more code boilerplate. It's not that verbose or complicated to write but I think the Elm architecture is more suited to statically typed languages.
FRP
Libraries like RxJS, BaconJS or Kefir can be used to produce FRP streams to handle communication between components.
You can try for example Rx-React
I think using these libs is quite similar to using what the ELM language offers with signals.
CycleJS framework does not use ReactJS but uses vdom. It share a lot of similarities with the Elm architecture (but is more easy to use in real life because it allows vdom hooks) and it uses RxJs extensively instead of functions, and can be a good source of inspiration if you want to use FRP with React. CycleJs Egghead videos are nice to understand how it works.
CSP
CSP (Communicating Sequential Processes) are currently popular (mostly because of Go/goroutines and core.async/ClojureScript) but you can use them also in javascript with JS-CSP.
James Long has done a video explaining how it can be used with React.
Sagas
A saga is a backend concept that comes from the DDD / EventSourcing / CQRS world, also called "process manager".
It is being popularized by the redux-saga project, mostly as a replacement to redux-thunk for handling side-effects (ie API calls etc). Most people currently think it only services for side-effects but it is actually more about decoupling components.
It is more of a compliment to a Flux architecture (or Redux) than a totally new communication system, because the saga emit Flux actions at the end. The idea is that if you have widget1 and widget2, and you want them to be decoupled, you can't fire action targeting widget2 from widget1. So you make widget1 only fire actions that target itself, and the saga is a "background process" that listens for widget1 actions, and may dispatch actions that target widget2. The saga is the coupling point between the 2 widgets but the widgets remain decoupled.
If you are interested take a look at my answer here
Conclusion
If you want to see an example of the same little app using these different styles, check the branches of this repository.
I don't know what is the best option in the long term but I really like how Flux looks like event-sourcing.
If you don't know event-sourcing concepts, take a look at this very pedagogic blog: Turning the database inside out with apache Samza, it is a must-read to understand why Flux is nice (but this could apply to FRP as well)
I think the community agrees that the most promising Flux implementation is Redux, which will progressively allow very productive developer experience thanks to hot reloading. Impressive livecoding ala Bret Victor's Inventing on Principle video is possible!
OK, there are few ways to do it, but I exclusively want focus on using store using Redux which makes your life much easier for these situations rather than give you a quick solution only for this case, using pure React will end up mess up in real big application and communicating between Components becomes harder and harder as the application grows...
So what Redux does for you?
Redux is like local storage in your application which can be used whenever you need data to be used in different places in your application...
Basically, Redux idea comes from flux originally, but with some fundamental changes including the concept of having one source of truth by creating only one store...
Look at the graph below to see some differences between Flux and Redux...
Consider applying Redux in your application from the start if your application needs communication between Components...
Also reading these words from Redux Documentation could be helpful to start with:
As the requirements for JavaScript single-page applications have
become increasingly complicated, our code must manage more state than
ever before. This state can include server responses and cached data,
as well as locally created data that has not yet been persisted to the
server. UI state is also increasing in complexity, as we need to
manage active routes, selected tabs, spinners, pagination controls,
and so on.
Managing this ever-changing state is hard. If a model can update
another model, then a view can update a model, which updates another
model, and this, in turn, might cause another view to update. At some
point, you no longer understand what happens in your app as you have
lost control over the when, why, and how of its state. When a system
is opaque and non-deterministic, it's hard to reproduce bugs or add
new features.
As if this wasn't bad enough, consider the new requirements becoming
common in front-end product development. As developers, we are
expected to handle optimistic updates, server-side rendering, fetching
data before performing route transitions, and so on. We find ourselves
trying to manage a complexity that we have never had to deal with
before, and we inevitably ask the question: is it time to give up? The
answer is no.
This complexity is difficult to handle as we're mixing two concepts
that are very hard for the human mind to reason about: mutation and
asynchronicity. I call them Mentos and Coke. Both can be great in
separation, but together they create a mess. Libraries like React
attempt to solve this problem in the view layer by removing both
asynchrony and direct DOM manipulation. However, managing the state of
your data is left up to you. This is where Redux enters.
Following in the steps of Flux, CQRS, and Event Sourcing, Redux
attempts to make state mutations predictable by imposing certain
restrictions on how and when updates can happen. These restrictions
are reflected in the three principles of Redux.
This is the way I handled this.
Let's say you have a <select> for Month and a <select> for Day.
The number of days depends on the selected month.
Both lists are owned by a third object, the left panel. Both <select> are also children of the leftPanel <div>
It's a game with the callbacks and the handlers in the LeftPanel component.
To test it, just copy the code into two separated files and run the index.html. Then select a month and see how the number of days changes.
dates.js
/** #jsx React.DOM */
var monthsLength = [0,31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
var MONTHS_ARR = ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];
var DayNumber = React.createClass({
render: function() {
return (
<option value={this.props.dayNum}>{this.props.dayNum}</option>
);
}
});
var DaysList = React.createClass({
getInitialState: function() {
return {numOfDays: 30};
},
handleMonthUpdate: function(newMonthix) {
this.state.numOfDays = monthsLength[newMonthix];
console.log("Setting days to " + monthsLength[newMonthix] + " month = " + newMonthix);
this.forceUpdate();
},
handleDaySelection: function(evt) {
this.props.dateHandler(evt.target.value);
},
componentDidMount: function() {
this.props.readyCallback(this.handleMonthUpdate)
},
render: function() {
var dayNodes = [];
for (i = 1; i <= this.state.numOfDays; i++) {
dayNodes = dayNodes.concat([<DayNumber dayNum={i} />]);
}
return (
<select id={this.props.id} onChange = {this.handleDaySelection}>
<option value="" disabled defaultValue>Day</option>
{dayNodes}
</select>
);
}
});
var Month = React.createClass({
render: function() {
return (
<option value={this.props.monthIx}>{this.props.month}</option>
);
}
});
var MonthsList = React.createClass({
handleUpdate: function(evt) {
console.log("Local handler:" + this.props.id + " VAL= " + evt.target.value);
this.props.dateHandler(evt.target.value);
return false;
},
render: function() {
var monthIx = 0;
var monthNodes = this.props.data.map(function (month) {
monthIx++;
return (
<Month month={month} monthIx={monthIx} />
);
});
return (
<select id = {this.props.id} onChange = {this.handleUpdate}>
<option value="" disabled defaultValue>Month</option>
{monthNodes}
</select>
);
}
});
var LeftPanel = React.createClass({
dayRefresh: function(newMonth) {
// Nothing - will be replaced
},
daysReady: function(refreshCallback) {
console.log("Regisering days list");
this.dayRefresh = refreshCallback;
},
handleMonthChange: function(monthIx) {
console.log("New month");
this.dayRefresh(monthIx);
},
handleDayChange: function(dayIx) {
console.log("New DAY: " + dayIx);
},
render: function() {
return(
<div id="orderDetails">
<DaysList id="dayPicker" dateHandler={this.handleDayChange} readyCallback = {this.daysReady} />
<MonthsList data={MONTHS_ARR} id="monthPicker" dateHandler={this.handleMonthChange} />
</div>
);
}
});
React.renderComponent(
<LeftPanel />,
document.getElementById('leftPanel')
);
And the HTML for running the left panel component
index.html
<!DOCTYPE html>
<html>
<head>
<title>Dates</title>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.6.0/underscore-min.js"></script>
<script src="//fb.me/react-0.11.1.js"></script>
<script src="//fb.me/JSXTransformer-0.11.1.js"></script>
</head>
<style>
#dayPicker {
position: relative;
top: 97px;
left: 20px;
width: 60px;
height: 17px;
}
#monthPicker {
position: relative;
top: 97px;
left: 22px;
width: 95px;
height: 17px;
}
select {
font-size: 11px;
}
</style>
<body>
<div id="leftPanel">
</div>
<script type="text/jsx" src="dates.js"></script>
</body>
</html>
I saw that the question is already answered, but if you'd like to learn more details, there are a total of 3 cases of communication between components:
Case 1: Parent to Child communication
Case 2: Child to Parent communication
Case 3: Not-related components (any component to any component) communication
I once was where you are right now, as a beginner you sometimes feel out of place on how the react way to do this. I'm gonna try to tackle the same way I think of it right now.
States are the cornerstone for communication
Usually what it comes down to is the way that you alter the states in this component in your case you point out three components.
<List /> : Which probably will display a list of items depending on a filter
<Filters />: Filter options that will alter your data.
<TopBar />: List of options.
To orchestrate all of this interaction you are going to need a higher component let's call it App, that will pass down actions and data to each one of this components so for instance can look like this
<div>
<List items={this.state.filteredItems}/>
<Filter filter={this.state.filter} setFilter={setFilter}/>
</div>
So when setFilter is called it will affect the filteredItem and re-render both component;. In case this is not entirely clear I made you an example with checkbox that you can check in a single file:
import React, {Component} from 'react';
import {render} from 'react-dom';
const Person = ({person, setForDelete}) => (
<div>
<input type="checkbox" name="person" checked={person.checked} onChange={setForDelete.bind(this, person)} />
{person.name}
</div>
);
class PeopleList extends Component {
render() {
return(
<div>
{this.props.people.map((person, i) => {
return <Person key={i} person={person} setForDelete={this.props.setForDelete} />;
})}
<div onClick={this.props.deleteRecords}>Delete Selected Records</div>
</div>
);
}
} // end class
class App extends React.Component {
constructor(props) {
super(props)
this.state = {people:[{id:1, name:'Cesar', checked:false},{id:2, name:'Jose', checked:false},{id:3, name:'Marbel', checked:false}]}
}
deleteRecords() {
const people = this.state.people.filter(p => !p.checked);
this.setState({people});
}
setForDelete(person) {
const checked = !person.checked;
const people = this.state.people.map((p)=>{
if(p.id === person.id)
return {name:person.name, checked};
return p;
});
this.setState({people});
}
render () {
return <PeopleList people={this.state.people} deleteRecords={this.deleteRecords.bind(this)} setForDelete={this.setForDelete.bind(this)}/>;
}
}
render(<App/>, document.getElementById('app'));
Extending answer of #MichaelLaCroix when a scenario is that the components can't communicate between any sort of parent-child relationship, the documentation recommends setting up a global event system.
In the case of <Filters /> and <TopBar /> don't have any of the above relationship, a simple global emitter could be used like this:
componentDidMount - Subscribe to event
componentWillUnmount - Unsubscribe from event
React.js and EventSystem code
EventSystem.js
class EventSystem{
constructor() {
this.queue = {};
this.maxNamespaceSize = 50;
}
publish(/** namespace **/ /** arguments **/) {
if(arguments.length < 1) {
throw "Invalid namespace to publish";
}
var namespace = arguments[0];
var queue = this.queue[namespace];
if (typeof queue === 'undefined' || queue.length < 1) {
console.log('did not find queue for %s', namespace);
return false;
}
var valueArgs = Array.prototype.slice.call(arguments);
valueArgs.shift(); // remove namespace value from value args
queue.forEach(function(callback) {
callback.apply(null, valueArgs);
});
return true;
}
subscribe(/** namespace **/ /** callback **/) {
const namespace = arguments[0];
if(!namespace) throw "Invalid namespace";
const callback = arguments[arguments.length - 1];
if(typeof callback !== 'function') throw "Invalid callback method";
if (typeof this.queue[namespace] === 'undefined') {
this.queue[namespace] = [];
}
const queue = this.queue[namespace];
if(queue.length === this.maxNamespaceSize) {
console.warn('Shifting first element in queue: `%s` since it reached max namespace queue count : %d', namespace, this.maxNamespaceSize);
queue.shift();
}
// Check if this callback already exists for this namespace
for(var i = 0; i < queue.length; i++) {
if(queue[i] === callback) {
throw ("The exact same callback exists on this namespace: " + namespace);
}
}
this.queue[namespace].push(callback);
return [namespace, callback];
}
unsubscribe(/** array or topic, method **/) {
let namespace;
let callback;
if(arguments.length === 1) {
let arg = arguments[0];
if(!arg || !Array.isArray(arg)) throw "Unsubscribe argument must be an array";
namespace = arg[0];
callback = arg[1];
}
else if(arguments.length === 2) {
namespace = arguments[0];
callback = arguments[1];
}
if(!namespace || typeof callback !== 'function') throw "Namespace must exist or callback must be a function";
const queue = this.queue[namespace];
if(queue) {
for(var i = 0; i < queue.length; i++) {
if(queue[i] === callback) {
queue.splice(i, 1); // only unique callbacks can be pushed to same namespace queue
return;
}
}
}
}
setNamespaceSize(size) {
if(!this.isNumber(size)) throw "Queue size must be a number";
this.maxNamespaceSize = size;
return true;
}
isNumber(n) {
return !isNaN(parseFloat(n)) && isFinite(n);
}
}
NotificationComponent.js
class NotificationComponent extends React.Component {
getInitialState() {
return {
// optional. see alternative below
subscriber: null
};
}
errorHandler() {
const topic = arguments[0];
const label = arguments[1];
console.log('Topic %s label %s', topic, label);
}
componentDidMount() {
var subscriber = EventSystem.subscribe('error.http', this.errorHandler);
this.state.subscriber = subscriber;
}
componentWillUnmount() {
EventSystem.unsubscribe('error.http', this.errorHandler);
// alternatively
// EventSystem.unsubscribe(this.state.subscriber);
}
render() {
}
}
There is such possibility even if they are not Parent - Child relationship - and that's Flux. There is pretty good (for me personally) implementation for that called Alt.JS (with Alt-Container).
For example you can have Sidebar that is dependent on what is set in component Details. Component Sidebar is connected with SidebarActions and SidebarStore, while Details is DetailsActions and DetailsStore.
You could use then AltContainer like that
<AltContainer stores={{
SidebarStore: SidebarStore
}}>
<Sidebar/>
</AltContainer>
{this.props.content}
Which would keep stores (well I could use "store" instead of "stores" prop). Now, {this.props.content} CAN BE Details depending on the route. Lets say that /Details redirect us to that view.
Details would have for example a checkbox that would change Sidebar element from X to Y if it would be checked.
Technically there is no relationship between them and it would be hard to do without flux. BUT WITH THAT it is rather easy.
Now let's get to DetailsActions. We will create there
class SiteActions {
constructor() {
this.generateActions(
'setSiteComponentStore'
);
}
setSiteComponent(value) {
this.dispatch({value: value});
}
}
and DetailsStore
class SiteStore {
constructor() {
this.siteComponents = {
Prop: true
};
this.bindListeners({
setSiteComponent: SidebarActions.COMPONENT_STATUS_CHANGED
})
}
setSiteComponent(data) {
this.siteComponents.Prop = data.value;
}
}
And now, this is the place where magic begin.
As You can see there is bindListener to SidebarActions.ComponentStatusChanged which will be used IF setSiteComponent will be used.
now in SidebarActions
componentStatusChanged(value){
this.dispatch({value: value});
}
We have such thing. It will dispatch that object on call. And it will be called if setSiteComponent in store will be used (that you can use in component for example during onChange on Button ot whatever)
Now in SidebarStore we will have
constructor() {
this.structures = [];
this.bindListeners({
componentStatusChanged: SidebarActions.COMPONENT_STATUS_CHANGED
})
}
componentStatusChanged(data) {
this.waitFor(DetailsStore);
_.findWhere(this.structures[0].elem, {title: 'Example'}).enabled = data.value;
}
Now here you can see, that it will wait for DetailsStore. What does it mean? more or less it means that this method need to wait for DetailsStoreto update before it can update itself.
tl;dr
One Store is listening on methods in a store, and will trigger an action from component action, which will update its own store.
I hope it can help you somehow.
If you want to explore options of communicating between components and feel like it is getting harder and harder, then you might consider adopting a good design pattern: Flux.
It is simply a collection of rules that defines how you store and mutate application wide state, and use that state to render components.
There are many Flux implementations, and Facebook's official implementation is one of them. Although it is considered the one that contains most boilerplate code, but it is easier to understand since most of the things are explicit.
Some of Other alternatives are flummox fluxxor fluxible and redux.
The following code helps me to setup communication between two siblings. The setup is done in their parent during render() and componentDidMount() calls.
It is based on https://reactjs.org/docs/refs-and-the-dom.html
Hope it helps.
class App extends React.Component<IAppProps, IAppState> {
private _navigationPanel: NavigationPanel;
private _mapPanel: MapPanel;
constructor() {
super();
this.state = {};
}
// `componentDidMount()` is called by ReactJS after `render()`
componentDidMount() {
// Pass _mapPanel to _navigationPanel
// It will allow _navigationPanel to call _mapPanel directly
this._navigationPanel.setMapPanel(this._mapPanel);
}
render() {
return (
<div id="appDiv" style={divStyle}>
// `ref=` helps to get reference to a child during rendering
<NavigationPanel ref={(child) => { this._navigationPanel = child; }} />
<MapPanel ref={(child) => { this._mapPanel = child; }} />
</div>
);
}
}
Oddly nobody mentioned mobx. The idea is similar to redux. If I have a piece of data that multiple components are subscribed to it, then I can use this data to drive multiple components.

Which pattern to use

I have a class - call it ThankYou that delivers these. Based on the different implementations, generic or Facebook, I need to deliver customized layout. Right now, I am building the HTML in JS and delivering the layout.
1) Sign up for email newsletters (for generic and Facebook implementation)
2) Teaser content (for generic implementation)
3) Facebook like(for Facebook ThankYou implementation)
Which design pattern do you think this is better implemented using - Factory or Mediator? I am just starting to utilize some design patterns in my code and would like to start off on the right foot.
Some notes:
a) Although the functionality might be the same, the layout might be different for generic and Facebook
If I don't use a design pattern, I could easily do this using an 'if' statement, but I am just looking for a more elegant solution.
I think that Factory more suitable in this case. You have base class (interface) called IThankYou that implements common methods and two classes extending base functionality. Factory stores mapping between type and class.
Small example code:
function IThankYou () {}
IThankYou.prototype = {
templates: { // this is common field for all instances extending this class
like: '<div class="b-like">Like</div>',
},
like: function () { throw "Unimplemented" }, // this method is not implemented in base class
commonMethod: function () { } // this is common method
};
function GenericThankYou (someParam) { this.someParam = someParam; };
GenericThankYou.prototype = new IThankYou;
GenericThankYou.prototype.like = function () {
// there you could use base class fields and methods
this.commonMethod();
};
function FacebookThankYou (someParam) { this.someParam = someParam; };
FacebookThankYou.prototype = new IThankYou;
FacebookThankYou.prototype.like = function () {
// there you could use base class templates map
};
var ThankYouFactory = {
typeMap: {
'facebook' : FacebookThankYou,
'generic' : GenericThankYou
},
getConstructor: function (type) {
return this.typeMap[type];
}
};
ThankYouFactory.getConstructor('facebook')(ctorParam);
ThankYouFactory.getConstructor('generic')(ctorParam);

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