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Migrating safely to React (part 2) @jamischarles React Amsterdam 2016

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UI Engineer Send Money San Jose, CA

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Back

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2014

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C++ XML Markup

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Server {Dust.js} Client Kraken.js BB

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• too many abstraction layers • low confidence • difficult state bugs (currency codes mismatched etc) Pain

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• V1: Just ship it • Maintainability is low priority • Complexity rises What happened?

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by Rich Hickey Clojure Simple Made Easy

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Speed Time Easy

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Speed Time Simple

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Speed Time Easy Simple

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“Simple → predictable → Reliable”

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1 feature →

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• React simplifies the view (fewer files) • Quick win • Push it to prod • Learn & evaluate Lessons learned

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Beyond the view

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1. View layer 2. Routing layer 3. Data layer The pieces

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• Backbone Router + custom routing logic • complex • difficult to track url -> code • good opportunity Routing Layer

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/request Routing /send

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/request Routing /send

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/request Routing /send

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/request Routing /send

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/request Routing /send

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require('backboneSubroute'); module.exports = Backbone.SubRoute.extend({ routes: { '': 'showTransfer', ':type(/:action)': 'showTransfer' }, […]

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require('backboneSubroute'); module.exports = Backbone.SubRoute.extend({ showView: function (options) { if (options.name) { this.loadScripts(options); } historyModel.addPath(options.name); }, getPath: function (scriptName) { // getPath code }, loadScripts: function (options) { // loadScripts code }, cleanView: function () { // cleanView code } });

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// React Components... import MainContainer from '../containers/main'; import RequestContainer from '../containers/request'; import SendContainer from '../containers/send'; import BuyContainer from '../containers/buy'; ReactDOM.render( {/* Flow entry points */} , document.getElementById('react-transfer-container'));

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/request Routing /send

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import React from 'react'; import indexView from '../index'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, componentDidMount() { this.showBBView(); }, componentDidUpdate() { this.showBBView(); }, // will load and show a Backbone view. showBBView() { let type = 'send'; let action = this.props.params.action || 'recipient'; // gets content and renders it into the DOM. indexView.navigate(type, action); }, render() { return null; } }); export default SendContainer;

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import React from 'react'; import indexView from '../index'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, componentDidMount() { this.showBBView(); }, componentDidUpdate() { this.showBBView(); }, // will load and show a Backbone view. showBBView() { let type = 'send'; let action = this.props.params.action || 'recipient'; // gets content and renders it into the DOM. indexView.navigate(type, action); }, render() { return null; } }); export default SendContainer;

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import React from 'react'; import indexView from '../index'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, componentDidMount() { this.showBBView(); }, componentDidUpdate() { this.showBBView(); }, // will load and show a Backbone view. showBBView() { let type = 'send'; let action = this.props.params.action || 'recipient'; // gets content and renders it into the DOM. indexView.navigate(type, action); }, render() { return null; } }); export default SendContainer;

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import React from 'react'; import indexView from '../index'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, componentDidMount() { this.showBBView(); }, componentDidUpdate() { this.showBBView(); }, // will load and show a Backbone view. showBBView() { let type = 'send'; let action = this.props.params.action || 'recipient'; // gets content and renders it into the DOM. indexView.navigate(type, action); }, render() { return null; } }); export default SendContainer;

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/request Routing /send

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/request Routing /send

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/request Routing /send

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import React from 'react'; import * as routeUtil from '../utils/routeHelper'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, componentDidMount () { this.showBBView(); }, componentDidUpdate() { this.showBBView(); }, // will load and show a Backbone view. showBBView() { let type = 'send'; let action = this.props.params.action || 'recipient'; // gets content and renders it into the DOM. routeUtil.getIndexView().navigate(type, action); }, render() { return null; } }); export default SendContainer;

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import React from 'react'; import * as routeUtil from '../utils/routeHelper'; let SendContainer = React.createClass({ propTypes: { params: React.PropTypes.object.isRequired }, render() { return } }); export default SendContainer;

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• Url → code is easy now • Reduced complexity • Good migration path for a give url Routing Layer

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• Backbone Models & Collections • complex • Most of our state pain comes from here Data Layer

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Migrate 1 feature?

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new feature

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• Larger time investment • Greater risk • More testing / QA needed What about old data?

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Optimize for future change

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– Michael Feathers “You have to build a barrier between yourself and the framework.”

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– Jamis Charles “Use as much vanilla JS as possible.”

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import $ from ‘jquery'; import Backbone from ‘backbone'; export default Backbone.View.extend({ el: 'form', events: { 'keyup #note': 'resizeTextAreaField', 'blur #note': 'hideTextAreaCounters' }, // Resize text area as user types resizeTextAreaField: function (event) { var count = this.countTextContent(); var newHeight = this.getIdealTextAreaHeight(count); var newRows = this.getRowsFromHeight(newHeight); $('#note').height(newHeight).attr('rows', newRows); }, // Update textarea counter with remaining character left hideTextAreaCounters: function (event) { // pseudo code },

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import $ from ‘jquery'; import Backbone from ‘backbone'; export default Backbone.View.extend({ el: 'form', events: { 'keyup #note': 'resizeTextAreaField', 'blur #note': 'hideTextAreaCounters' }, // Resize text area as user types resizeTextAreaField: function (event) { var count = this.countTextContent(); var newHeight = this.getIdealTextAreaHeight(count); var newRows = this.getRowsFromHeight(newHeight); $('#note').height(newHeight).attr('rows', newRows); }, // Update textarea counter with remaining character left hideTextAreaCounters: function (event) { // pseudo code },

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import $ from ‘jquery'; import Backbone from ‘backbone'; import * as ResizeUtil from 'utils/resizeTextareaUtil'; export default Backbone.View.extend({ el: 'form', events: { 'keyup #note': 'resizeTextAreaField', 'blur #note': 'hideTextAreaCounters' }, // Resize text area as user types resizeTextAreaField: ResizeUtil.resizeField, // Update textarea counter with remaining character left hideTextAreaCounters: ResizeUtil.hideTextArea });

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In Conclusion

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Solve real problems

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Thank you

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Sources • React Rally talk: https://www.youtube.com/ watch?v=mrtwImsEq5s • Moving from Require to Webpack 
 https://www.paypal-engineering.com/ 2015/08/07/1450/ • http://www.infoq.com/presentations/Simple- Made-Easy

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@jamischarles #reactamsterdam

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