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Using Typescript with Arcgis API for Javascript Noah Sager | René Rubalcava Slides

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Using Typescript with Arcgis API for Javascript Noah Sager | René Rubalcava Slides Using TypeScript with ArcGIS API for JavaScript Noah Sager | René Rubalcava slides: https://git.io/fj2Ej 1 Agenda What is TypeScript? Why use TypeScript? Setup and First steps Live Action Demo Where can I get more info? 2 What is TypeScript? 3 Where do I begin? 4 Developer Setup 5 Why use TypeScript? TypeScript adds type support to JavaScript 6 Why use TypeScript? Enhanced IDE support 7 Why use TypeScript? Makes use of the latest JavaScript features 8 Why use TypeScript? Makes use of the latest JavaScript features 9 Setup and First steps 1. The recommended way to install TypeScript is via node and npm. 2. Make sure to install TypeScript globally: npm install -g typescript 3. Install the ArcGIS API for JavaScript Typings: npm install --save @types/arcgis-js-api 10 Demo: Build a TypeScript app from scratch 11 Tip! ArcGIS API for JavaScript Snippets 12 Demo Steps: mkdir ts-demo && cd ts-demo mkdir app && mkdir css npm init --yes && tsc --init npm i -D @types/arcgis-js-api 13 index.html Snippet shortcuts ! getApi <body> <div id="viewDiv"></div> <script> require(["app/main"]); </script> </body> 14 tscong.json { "compilerOptions": { "lib": ["dom", "es2015.promise", "es5"], "module": "amd", // output files as AMD modules "sourceMap": true, "target": "es5", "noImplicitAny": true, "suppressImplicitAnyIndexErrors": true, "esModuleInterop": true } } 15 css/main.css html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; } and add it to html <link rel="stylesheet" href="css/main.css"> 16 app/main.ts imports import WebMap from "esri/WebMap"; import MapView from "esri/views/MapView"; import LayerList from "esri/widgets/LayerList"; import esri = __esri; 17 app/main.ts WebMap and MapView const map = new WebMap({ portalItem: { id: "d5dda743788a4b0688fe48f43ae7beb9" } }); // Add the map to a MapView const view = new MapView({ container: "viewDiv", map }); 18 app/main.ts LayerList // Add a legend instance to the panel of a // ListItem in a LayerList instance const layerList = new LayerList({ view, listItemCreatedFunction: event => { const item: esri.ListItem = event.item; if (item.layer.type != "group") { item.panel = { content: "legend", open: true } as esri.ListItemPanel; } } 19 start typescript compiler tsc -w 20 Tip: Hide .js and .jsmap les Reduce clutter VSCode: Add below to user preferences in les.exclude "**/*.js.map": true, "**/*.js": { "when": "$(basename).ts" 21 Tip: Debugging with source maps Enable source maps in browser dev tools Set breakpoints in .ts instead of .js 22 Tip: Use __esri instead of import Only contains type interfaces Can use when not instantiating type import esri = __esri; const layerList = new LayerList({ view, listItemCreatedFunction: event => { const item = event.item as esri.ListItem; } }); 23 Where can I get more info? SDK Documentation Esri-related training and webinars ArcGIS Blogs GeoNet, StackExchange, Spatial Community in Slack, etc. 24 25 26 27.
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