@binary-com/smartcharts

SmartCharts

SmartCharts is both the name of the app (charts.binary.com) and the charting library. You can install the library to your project via:

yarn add @binary-com/smartcharts

Important Note: the license for the library is tied to the binary.com domain name; it will not work in github pages.

Commands:

• use yarn install to install dependencies
• use yarn start to launch webpack dev server
• use yarn build to build the library
• use yarn build:app to build the charts.binary.com app
• use yarn analyze to run webpack-bundle-analyzer

Note: eventhough both yarn build and yarn build:app outputs smartcharts.js and smartcharts.css, they are not the same files. One outputs a library and the the other outputs an app.

Usage

Quick Start

In the app folder, we provide a working webpack project that uses the smartcharts library. Simply cd to that directory and run:

yarn install
yarn start

The sample app should be running in http://localhost:8080.

Refer to library usage inside app/index.jsx:

import { SmartChart } from '@binary-com/smartcharts';

class App extends React.Component {
    render() {
        return (
            <SmartChart
                onSymbolChange={(symbol) => console.log('Symbol has changed to:', symbol)}
                requestSubscribe={({ symbol, granularity, ... }, cb) => {}}   // Passes the whole req object
                requestForget={({ symbol, granularity }, cb) => {}}         // cb is exactly the same reference passed to subscribe
                // for active_symbols, trading_times, ... (NOT streaming)
                requestAPI={({...}) => Promise} // whole request object, shouldn't contain req_id
            />
        );
    }
};

SmartCharts expects library user to provide requestSubscribe, requestForget and requestAPI. Refer to API for more details.

The job of loading the active symbols or trading times or stream data from cache or retrieving from websocket is therefore NOT the responsibility of SmartCharts but the host application. SmartCharts simply makes the requests and expect a response in return.

Some important notes on your webpack.config.js (refer to app/webpack.config.js):

• The ChartIQ library and the smartcharts CSS file will need to be copied from the npm library (remember to include in your index.html). In the example we use the copy-webpack-plugin webpack plugin to do this:

new CopyWebpackPlugin([
   { from: './node_modules/@binary-com/smartcharts/dist/chartiq.min.js' },
   { from: './node_modules/@binary-com/smartcharts/dist/smartcharts.css' },
])

• You need to expose CIQ (the ChartIQ library) as a global object:

externals: {
    CIQ: 'CIQ'
}

API

Note: Props will take precedence over values set by the library.

Props marked with * are mandatory:

Props	Description
requestAPI*	SmartCharts will make single API calls by passing the request input directly to this method, and expects a Promise to be returned.
requestSubscribe*	SmartCharts will make streaming calls via this method. requestSubscribe expects 2 parameters (request, callback) => {}: the request input and a callback in which response will be passed to for each time a response is available. Keep track of this callback as SmartCharts will pass this to you to forget the subscription (via requestForget).
requestForget*	When SmartCharts no longer needs a subscription (made via requestSubscribe), it will call this method (passing in the callback passed from requestSubscribe) to halt the subscription.
lang	Sets the language.
chartControlsWidgets	Render function for chart control widgets. Refer to Customising Components.
topWidgets	Render function for top widgets. Refer to Customising Components.

Customising Components

We offer library users full control on deciding which of the top widgets and chart control buttons to be displayed by overriding the render methods themselves. To do this you pass in a function to chartControlsWidgets or topWidgets.

For example, we want to remove all the chart control buttons, and for top widgets to just show the comparison list (refer app/index.jsx):

import { ComparisonList } from '@binary-com/smartcharts';

const renderTopWidgets = () => (
    <React.Fragment>
        <div>Hi I just replaced the top widgets!</div>
        <ComparisonList />
    </React.Fragment>
);

const App = () => (
    <SmartChart
        topWidgets={renderTopWidgets}
        chartControlsWidgets={()=>{}}
    >
    </SmartChart>
);

Here are the following components you can import:

• Top widgets:
  • <ChartTitle />
  • <AssetInformation />
  • <ComparisonList />
• Chart controls:
  • <CrosshairToggle />
  • <ChartTypes />
  • <StudyLegend />
  • <Comparison />
  • <DrawTools />
  • <Views />
  • <Share />
  • <Timeperiod />
  • <ChartSize />
  • <ChartSetting />

Contribute

To contribute to SmartCharts, fork this project and checkout the dev branch. When adding features or performing bug fixes, it is recommended you make a separate branch off dev. Prior to sending pull requests, make sure all unit tests passed:

yarn test

Once your changes have been merged to dev, it will immediately deployed to charts.binary.com/beta.

Developer Notes

Separation of App and Library

There should be a clear distinction between developing for app and developing for library. Library source code is all inside src folder, whereas app source code is inside app.

Webpack determines whether to build an app or library depending on whether an environment variable BUILD_MODE is set to app. Setting this variable switches the entry point of the project, but on the same webpack.config.js (the one on the root folder). The webpack.config.js and index.html in the app folder is never actually used in this process; they serve as a guide to how to use the smartcharts library as an npm package. We do it this way to develop the app to have hot reload available when we modify library files.

Translations

All strings that need to be translated must be inside t.translate():

t.translate('[currency] [amount] payout if the last tick.', { 
    currency: 'USD',
    amount: 43.12
});
t.setLanguage('fr'); // components need to be rerendered for changes to take affect

Each time a new translation string is added to the code, you need to update the messages.pot via:

yarn translations

Once the new messages.pot is merged into the dev branch, it will automatically be updated in CrowdIn. You should expect to see a PR with the title New Crowdin translations in a few minutes; this PR will update the *.po files.

Manual Deployment

Deploy to NPM

yarn build && yarn publish

Deploy to charts.binary.com

Note: This is usually not required, since Travis will automatically deploy to charts.binary.com and charts.binary.com/beta when master and dev is updated.

The following commands will build and deploy to charts.binary.com (Make sure you are in the right branch!); you will need push access to this repository for the commands to work:

yarn deploy:beta        # charts.binary.com/beta
yarn deploy:production  # charts.binary.com

Deploy to Github Pages

As ChartIQ license is tied to the binary.com domain name, we provide developers with a binary.sx to test out the library on their Github Pages.

Assuming you have a binary.sx subdomain pointed to your github.io page, you can deploy the SmartCharts app by doing the following:

1. add a file with named CNAME in your project directory with your site name, Ex: developer.binary.sx
2. run yarn build-travis && yarn gh-pages

Now you should be able to see your SmartCharts app on (developer.binary.sx )

Note: yarn build-travis will add hashing inside index.html; do not push those changes to git!