Table of Contents for
OpenLayers 3.x Cookbook - Second Edition

Version ebook / Retour

Cover image for bash Cookbook, 2nd Edition OpenLayers 3.x Cookbook - Second Edition by Antonio Santiago Perez Published by Packt Publishing, 2016
  1. Cover
  2. Table of Contents
  3. OpenLayers 3.x Cookbook Second Edition
  4. OpenLayers 3.x Cookbook Second Edition
  5. Credits
  6. About the Authors
  7. About the Reviewer
  8. www.PacktPub.com
  9. Preface
  10. What you need for this book
  11. Who this book is for
  12. Sections
  13. Conventions
  14. Reader feedback
  15. Customer support
  16. 1. Web Mapping Basics
  17. Creating a simple fullscreen map
  18. Playing with the map's options
  19. Managing the map's stack layers
  20. Managing the map's controls
  21. Moving around the map view
  22. Restricting the map's extent
  23. 2. Adding Raster Layers
  24. Using Bing imagery
  25. Using OpenStreetMap imagery
  26. Adding WMS layers
  27. Changing the zoom effect
  28. Changing layer opacity
  29. Buffering the layer data to improve map navigation
  30. Creating an image layer
  31. Setting the tile size in WMS layers
  32. 3. Working with Vector Layers
  33. Adding a GML layer
  34. Adding a KML layer
  35. Creating features programmatically
  36. Exporting features as GeoJSON
  37. Reading and creating features from a WKT
  38. Using point features as markers
  39. Removing or cloning features using overlays
  40. Zooming to the extent of a layer
  41. Adding text labels to geometry points
  42. Adding features from a WFS server
  43. Using the cluster strategy
  44. Reading features directly using AJAX
  45. Creating a heat map
  46. 4. Working with Events
  47. Creating a side-by-side map comparator
  48. Implementing a work-in-progress indicator for map layers
  49. Listening for the vector layer features' events
  50. Listening for mouse or touch events
  51. Using the keyboard to pan or zoom
  52. 5. Adding Controls
  53. Adding and removing controls
  54. Working with geolocation
  55. Placing controls outside the map
  56. Drawing features across multiple vector layers
  57. Modifying features
  58. Measuring distances and areas
  59. Getting feature information from a data source
  60. Getting information from a WMS server
  61. 6. Styling Features
  62. Styling layers
  63. Styling features based on geometry type
  64. Styling based on feature attributes
  65. Styling interaction render intents
  66. Styling clustered features
  67. 7. Beyond the Basics
  68. Working with projections
  69. Creating a custom control
  70. Selecting features by dragging out a selection area
  71. Transitioning between weather forecast imagery
  72. Using the custom OpenLayers library build
  73. Drawing in freehand mode
  74. Modifying layer appearance
  75. Adding features to the vector layer by dragging and dropping them
  76. Making use of map permalinks
  77. Index

Chapter 5. Adding Controls

In this chapter, we will cover the following topics:

  • Adding and removing controls
  • Working with geolocation
  • Placing controls outside the map
  • Drawing features across multiple vector layers
  • Modifying features
  • Measuring distances and areas
  • Getting feature information from a data source
  • Getting information from a WMS server

Introduction

Controls allow us to navigate around the map, play with layers, zoom in or out, and perform actions, such as editing features, measuring distances, and so on. In essence, controls allow us to interact.

OpenLayers comes with controls that are visually represented on the map through DOM elements and can be styled with CSS. Such controls, such as Attribution, FullScreen, and Zoom, fall under this category. These types of controls are subclasses of ol.control.Control.

There are also other kinds of controls that are invisible to the user, but they provide just as important interactions. Controls, such as KeyboardPan, Select, and PinchZoom, are of this type. These types of controls are part of the ol.interaction object.

There are also other helper methods that one could consider a type of control, such as the ol.Geolocation class that provides HTML5 geolocation capabilities.

Controls can be activated or deactivated as desired. Many controls or interactions are already included on a map by default to cover common interactions that a user may be accustomed to from usage across other mapping applications. Custom controls can be created too, which we will cover in the Creating a custom control recipe, in Chapter 7, Beyond the Basics.

Controls listen for events, such as a click or tap. This event management is accomplished through the help of the Google Closure library. For example, the goog.events.listen subscriber method is used to register for a click event (goog.events.EventType.CLICK) on a DOM element, such as the Zoom button.

Let's take a look at some recipes that will help us understand the controls better.