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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

Starting actions outside the controls


Another different and drastic way to change the look of our applications is to place the controls outside the map and attach them to our own components.

Most of the OpenLayers controls have two features:

  • They realize some action (edit features, create a line, and so on)

  • They know how to render themselves on top of the map

To achieve the goal of this recipe, the idea is to separate the visualization from the action that the control does. This way, we can create some buttons and activate or deactivate a control depending on the button that is pressed:

As we can see in the screenshot, we are going to create a toolbar and place:

  • The same set of controls we can find in OpenLayers.Control.EditingToolbar, which will allow us to draw points, lines, and polygons

  • A dropdown button that will allow us to start the OpenLayers.Control.Measure action

Getting ready

We are going to use the Dojo Toolkit framework (http://dojotoolkit.org/) which we have used along with the source...

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