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Building Web and Mobile ArcGIS Server Applications with JavaScript ??? Second Edition

You're reading from   Building Web and Mobile ArcGIS Server Applications with JavaScript ??? Second Edition Build exciting custom web and mobile GIS applications with the ArcGIS Server API for JavaScript

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Product type Paperback
Published in Oct 2017
Publisher Packt
ISBN-13 9781787280526
Length 324 pages
Edition 2nd Edition
Languages
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Authors (2):
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Mark Lewin Mark Lewin
Author Profile Icon Mark Lewin
Mark Lewin
Eric Pimpler Eric Pimpler
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Eric Pimpler
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Table of Contents (21) Chapters Close

Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface
1. Introduction to HTML, CSS, and JavaScript FREE CHAPTER 2. Creating Maps and Adding Layers 3. Adding Graphics to the Map 4. The Feature Layer 5. Using Widgets and Toolbars 6. Performing Spatial and Attribute Queries 7. Identifying and Finding Features 8. Turning Addresses into Points and Points into Addresses 9. Directions and Routing 10. Geoprocessing Tasks 11. Geometry Operations 12. Integration with ArcGIS Online 13. Creating Mobile Applications 14. Looking Ahead - Version 4 of the ArcGIS API for JavaScript

Summary


In this chapter we introduced the concept of tasks in ArcGIS Server. ArcGIS Server provides a number of tasks for commonly used operations in a web mapping application, such as attribute and spatial queries.

To execute a query, you need a QueryTask object that references a layer within a map service that you will execute the query against. You also need a Query object to define the query itself.

Properties you might choose to set on the Query object include where and text properties to define attribute queries, a geometry property to define a spatial query, and an outFields property to subset the fields that should be returned.

When the ArcGIS Server has finished processing the query, it returns a FeatureSet object to your application by way of a callback function. You specify the name of this function when you execute the query.

The callback function is responsible for processing the FeatureSet and the array of Graphic objects it stores in its feature property, on the map.

In the next...

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