使用JavaScript构建Web和移动GIS应用实战

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"《Building Web and Mobile ArcGIS Server Applications with JavaScript》(PACKT,2014) 是一本关于利用JavaScript构建Web和移动GIS应用的教程。本书主要聚焦于使用ArcGIS Server API进行开发，该API是开发自定义ArcGIS Server应用的首选，因为它适用于Web和移动应用，且无需浏览器插件。书中通过实践性的步骤指导，帮助读者掌握HTML/CSS/JavaScript技术栈，并学习在地图中添加直观的地理图层、交互式查询和展示空间数据、构建用户界面小部件、访问地理处理任务等技能。此外，还深入探讨了如何将ArcGIS.com内容整合到自定义应用中，以及如何利用ArcGIS Server的各种任务，如空间和属性查询、特征识别、按属性查找特征等。" 在这本全面的指南中，作者Eric Pimpler引导读者逐步掌握构建功能完备的在线GIS应用的技术。首先，读者将学习创建自己的地图，然后了解如何从不同来源添加瓦片和动态地图服务的地理图层，向地图添加图形，以及使用FeatureLayer在浏览器中流式传输地理特征。书中详细介绍了地理编码和地理处理任务，这些是GIS应用中的关键功能，有助于实现各种GIS任务。此外，针对初学者，本书不仅介绍了JavaScript编程基础，还讲解了如何利用ArcGIS Server API来增强应用程序的功能。读者将学会如何实现地图的交互性，例如通过添加控制来允许用户缩放、平移和选择地图上的特定区域。通过丰富的示例和练习，读者可以逐步提升在Web和移动平台上构建GIS应用的能力。书中的实例和练习设计得既实用又具有挑战性，旨在帮助开发者轻松上手并迅速提高在GIS应用开发中的技能。无论你是GIS专业人士还是对此领域感兴趣的技术爱好者，这本书都能提供宝贵的知识和实践经验，帮助你构建出引人入胜的Web和移动GIS应用。

Preface

ArcGIS Server is the predominant platform used to develop GIS applications for

the Web. There are a number of programming languages you can use to develop

applications with ArcGIS Server, including JavaScript, Flex, and Silverlight.

JavaScript has become the preferred language for developing applications on this

platform, since it can be used for both web and mobile applications and doesn't

require the installation of a plugin for the application to be used in a browser.

Flex and Silverlight both fall short as languages for mobile development and

both require the use of a plugin for the application to run in a browser.

This book will teach you how to build web-based GIS applications using the ArcGIS

API for JavaScript. Using a practical, hands-on style of learning, you will learn how

to develop fully functional applications with ArcGIS Server and develop a skill set

that is in high demand.

You will learn how to create maps and add geographic layers from a variety of

sources, including tiled and dynamic map services. In addition, you'll learn how

to add graphics to the map and stream geographic features to the browser using

FeatureLayer. Most applications also include specic functionalities implemented

by ArcGIS Server as tasks. You'll learn how to use the various tasks provided by

ArcGIS Server, including queries, identication of features, nding features by

attributes, geoprocessing tasks, and more. Finally, you'll learn just how easy it is

to develop mobile applications with the ArcGIS API for JavaScript.

What this book covers

Chapter 1, Introduction to HTML, CSS, and JavaScript, covers fundamental HTML, CSS,

and JavaScript concepts before getting started with developing GIS applications with

the ArcGIS API for JavaScript.

Preface

[ 2 ]

Chapter 2, Creating Maps and Adding Layers, teaches you how to create a map and

add layers to the map. You will learn how to create an instance of the Map class,

add layers of data to the map, and display this information on a web page. The Map

class is the most fundamental class in the API as it provides the canvas for your data

layers and any subsequent activities that occur in your application. However, your

map is useless until you add layers of data. There are several types of data layers

that can be added to a map, including tiled, dynamic, and feature. Readers will learn

more about each of these layer types in this chapter.

Chapter 3, Adding Graphics to the Map, teaches the reader how to display temporary

points, lines, and polygons in GraphicsLayer on the map. GraphicsLayer is a

separate layer that always resides on top of other layers and stores all the graphics

associated with the map.

Chapter 4, The Feature Layer, offers additional capabilities, apart from inheriting

from GraphicsLayer, such as the ability to perform queries and selections. Feature

layers are also used for online editing of features. Feature layers differ from tiled

and dynamic map service layers, because feature layers bring geometry information

to the client computer to be drawn and stored by the web browser. Feature layers

potentially cut down on round trips to the server. A client can request the features

it needs, and perform selections and queries on those features without having to

request more information from the server.

Chapter 5, Using Widgets and Toolbars, covers out-of-the-box widgets that you

can drop into your application for enhanced productivity. The BasemapGallery,

Bookmarks, Print, Geocoding, Legend, Measurement, Scalebar, Gauge, and

Overview map widgets are included. In addition, the ArcGIS API for JavaScript also

includes helper classes for adding various toolbars to your applications, including

navigation and drawing toolbars.

Chapter 6, Performing Spatial and Attribute Queries, covers the ArcGIS Server Query

Task, which allows you to perform attribute and spatial queries against data layers

in a map service that have been exposed. You can also combine these query types to

perform a combination attribute and spatial query.

Chapter 7, Identifying and Finding Features, covers two common operations found in

any GIS application. These operations require that the user click a feature on the

map in the case of identication, or perform a query in the case of nding features.

In either case, information about particular features is returned. In this chapter,

the reader will learn how to use the IdentifyTask and FindTask objects to obtain

information about features.

Preface

[ 3 ]

Chapter 8, Turning Addresses into Points and Points into Addresses, covers the use of the

Locator task to perform geocoding and reverse geocoding. Geocoding is the process

of assigning a coordinate to an address, while reverse geocoding assigns an address

to a coordinate.

Chapter 9, Network Analyst Tasks, allows you to perform analyses on street networks,

such as nding the best route from one address to another, nding the closest school,

identifying a service area around a location, or responding to a set of orders with a

eet of service vehicles.

Chapter 10, Geoprocessing Tasks, allows you to execute custom models built in ArcGIS

Desktop using ModelBuilder. Models are run in an automated fashion from either a

desktop environment or via a centralized server accessed through a web application.

Any tool found in ArcToolbox, whether that be a tool for your ArcGIS license level

or a custom tool that you've built, can be used in a model and chained together with

other tools. Once constructed, these models can be run on a centralized server and

accessed via web applications. In this chapter, we will examine how you can access

these geoprocessing tasks through the ArcGIS API for JavaScript.

Chapter 11, Integration with ArcGIS Online, details how you can use the ArcGIS API

for JavaScript to access the data and maps created with ArcGIS.com. The website

ArcGIS.com is for working with maps and other types of geographic information.

On this site, you will nd applications for building and sharing maps. You will also

nd useful basemaps, data, applications, and tools that you can view and use, plus

communities you can join. For application developers, the really exciting news is

that you can integrate ArcGIS.com content into your custom developed applications

using the ArcGIS API for JavaScript. In this chapter, you will explore how ArcGIS.

com maps can be added to your applications.

Chapter 12, Creating Mobile Applications, details how you can build mobile GIS

applications using the ArcGIS API for JavaScript. ArcGIS Server support is currently

provided for iOS, Android, and BlackBerry operating systems. The API is integrated

with dojox/mobile. In this chapter, you'll learn about the compact build of the API

that makes web mapping applications possible through web-kit browsers as well as

the built-in gesture support.

Appendix, Application Design with ArcGIS Templates and Dojo, covers one of the most

difcult tasks for many web developers which is designing and creating the user

interface. The ArcGIS API for JavaScript and Dojo greatly simplies this task. Dojo's

layout dijits provide a simple, efcient way to create application layouts, and Esri

has provided a number of sample application layouts and templates that you can use

to get up and running quickly. In this appendix, the reader will learn techniques to

design an application quickly.

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