By Rene Rubalcava
ArcGIS net improvement is an example-rich consultant that teaches you to exploit the ArcGIS JavaScript API to construct customized GIS internet functions. The publication starts with easy-to-follow examples that introduce readers to the ArcGIS JavaScript API and exhibit how one can practice easy customizations. because the e-book progresses, you are going to discover a full-scale, web-mapping program. by way of the tip it is possible for you to to construct net apps that experience positive aspects you would in most cases anticipate finding in simple terms in committed GIS functions. Written for internet builders accustomed to JavaScript and simple GIS ideas. event with ArcGIS is beneficial, yet now not invaluable.
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Get ready for it! 1 From data to map A map is a way to visualize data. It could be basic data, such as locations of streets, or more detailed data, such as the location of census tracts. This section covers the following: ■ ■ ■ Creating a simple map with ArcGIS API for JavaScript Understanding in detail the pieces that make up the map Reviewing common map options TIP Before jumping in, review appendix A to make sure you have the recommended software installed to run the samples. 1, saving it in a directory where you can view it from a local web server.
The zoom level is equal to the level value specified in an LOD. The next commonly used option after basemap is the center option. This is a convenient way to center your map on a specified location when the application first loads. It’s typically used in conjunction with the zoom option to also set the default zoom level of the map. When working with the center option, note that the center coordinates you provide are in longitude and latitude, respectively, even though that may not be the spatial reference of your map.
I don’t explicitly cover what I consider JavaScript best practices when building your applications, but the code I provide is written in a style I think is best suited for the task at hand. For example, sometimes you use a single JavaScript file to build an application; other times, you load up to half a dozen JavaScript files. DOJO AND AMD LOADING The Dojo Toolkit is a popular JavaScript library that offers many tools for writing JavaScript, in particular for larger applications. The ArcGIS API for JavaScript is based on Dojo, so it’s inevitable that you’ll also learn Dojo as you begin using the API.
