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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
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Authors (2):
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Eric Pimpler Eric Pimpler
Author Profile Icon Eric Pimpler
Eric Pimpler
Mark Lewin Mark Lewin
Author Profile Icon Mark Lewin
Mark Lewin
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Table of Contents (15) Chapters Close

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

Setting a definition expression


Definition expressions are used to filter features that are streamed to the client based on the values of attribute fields. FeatureLayer contains a setDefinitionExpression() method that is used to create the filter expression. All features that meet the specified criteria will be returned for display on the map. You can build expressions using standard SQL syntax, as seen in the code example as follows:

featureLayer.setDefinitionExpression("Magnitude>7"); 

You can retrieve the current definition expression using the FeatureLayer.getDefinitionExpression() method, which returns a string containing the expression.

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