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  • Book Overview & Buying OpenLayers 2.10 Beginner's Guide
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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

By : Erik Hazzard
4.2 (9)
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OpenLayers 2.10 Beginner's Guide

OpenLayers 2.10 Beginner's Guide

4.2 (9)
By: Erik Hazzard

Overview of this book

This is a beginner's guide with the essential screenshots and clearly explained code, which also serves as a reference. This book is for anyone who has any interest in using maps on their website, from hobbyists to professional web developers. OpenLayers provides a powerful, but easy-to-use, pure JavaScript and HTML (no third-party plug-ins involved) toolkit to quickly make cross-browser web maps. A basic understanding of JavaScript will be helpful, but there is no prior knowledge required to use this book. If you've never worked with maps before, this book will introduce you to some common mapping topics and gently guide you through the OpenLayers library. If you're an experienced application developer, this book will also serve as a reference to the core components of OpenLayers.
Table of Contents (18 chapters)
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OpenLayers 2.10
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
1
Index

Configuring layer options


Let's take a look at a couple of the layer's options argument we passed in during the previous example.

Tip

Pay close attention to the commas. Both arguments and key:value pairs are separated by a comma, but make sure you do not have a comma after the last pair. Trailing commas will usually break your map and are usually a pain to debug—so if your map isn't working and you don't see any helpful error messages in Firebug, check for trailing commas. A great site to help with your code is http://jslint.com.

wms_state_lines layer options

This layer's options are:

{ displayInLayerSwitcher: false, minScale: 13841995.078125}

The first property, displayInLayerSwitcher , can be either true or false, and determines if the layer will appear in the layer switcher control (if there is a layer switcher control). In our example, we do have a layer switcher control and you'll notice that we don't see it in the list of layers. The layer is still there, and we can programmatically turn...

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