Book Image

Mastering OpenLayers 3

By : Gábor Farkas
Book Image

Mastering OpenLayers 3

By: Gábor Farkas

Overview of this book

OpenLayers 3 allows you to create stunning web mapping and WebGIS applications. It uses modern, cutting edge browser technologies. It is written with Closure Library, enabling you to build browser-independent applications without painful debugging ceremonies, which even have some limited fallback options for older browsers. With this guide, you will be introduced to the world of advanced web mapping and WebGIS. First, you will be introduced to the advanced features and functionalities available in OpenLayers 3. Next, you will be taken through the key points of creating custom applications with OpenLayers 3. You will then learn how to create the web mapping application of yours (or your company's) dream with this open source, expense-free, yet very powerful library. We’ll also show you how to make amazing looking thematic maps and create great effects with canvas manipulation. By the end of this book, you will have a strong command of web mapping and will be well on your way to creating amazing applications using OpenLayers 3.
Table of Contents (17 chapters)
Mastering OpenLayers 3
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface
Index

Customizing the default appearance


Now that we are clear about what parts can be customized with CSS, let's make an attempt to use it in practice. Firstly, we will need the code from the example in the previous chapter. If you look at the code appendix, you will see some files starting with ch02_css. The html and js files are exactly the same as we used in the last chapter. In this example, all the magic will take place in the css file.

Note

If you take a look at the html file, you can see our custom css file is declared after the official css file. This was done due to the phenomenon called CSS specificity. If two CSS file declarations are made to the same element with the same specificity, the order of the declarations will define the styling. As we have declared our custom css file after the official one, it will overwrite the default styling.

Identifying the classes

Open up the first example, called ch02_css.html, in your browser. You can see the already modified look of the previous example...