GEOG 863
GIS Mashups for Geospatial Professionals

Overview

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An important element of many geospatial applications is the ability to search for features that meet certain criteria. The nature of those criteria might be spatial (e.g., land parcels adjacent to a particular street) or non-spatial (e.g., land parcels owned by a particular person).

In Lesson 6, we’ll see how Query objects can be used in an Esri JS API app to answer both spatial and non-spatial questions. Before that, however, we’ll look at the API’s Search widget, which can be used to find values in a layer’s attribute table or to find places when configured to work with a locator service.

Objectives

At the successful completion of this lesson, you should be able to:

  • configure the Search widget using sources (layers and/or locators).
  • understand the concept of a promise (in a JS context).
  • set a layer's definition expression.
  • define and execute queries.

Questions?

If you have any questions now or at any point during this week, please feel free to post them to the Lesson 6 Discussion Forum. (That forum can be accessed at any time by clicking on the Discussions tab within Canvas.)