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OpenLayers Cookbook

You're reading from   OpenLayers Cookbook The best method to learn the many ways OpenLayers can be used to render data on maps is to dive straight into these recipes. With a mix of basic and advanced techniques, it's ideal for JavaScript novices and experts alike.

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Product type Paperback
Published in Aug 2012
Publisher Packt
ISBN-13 9781849517843
Length 300 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (15) Chapters Close

OpenLayers Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1. Web Mapping Basics FREE CHAPTER 2. Adding Raster Layers 3. Working with Vector Layers 4. Working with Events 5. Adding Controls 6. Theming 7. Styling Features 8. Beyond the Basics Index

Selecting features intersecting with a line


One common action when working with features within a vector layer is its selection and, of course, OpenLayers has some feature selection controls.

The OpenLayers.Control.SelectFeature control is specially useful as a selection control because the selection is made on the client side, that is, the selection is made through the features loaded in the browser. There is no request to a WFS server.

The OpenLayers.Control.SelectFeature control can work in different ways. We can select a feature just by clicking on it or we can draw a box to select all the contained features.

In contrast, it does not allow the possibility to select features that intersect with a path.

In this recipe, we are going to see how we can extend the OpenLayers.Control.SelectFeature control to allow select features for drawing a path.

How to do it...

  1. Create an HTML5 file and add the OpenLayers library dependencies. Now, include the code for the new OpenLayers.Control.SelectFeature...

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