When working with the ArcGIS API for JavaScript you'll often find yourself looping through arrays, like the collection of graphics stored in a graphics layer or the results of a QueryTask. In this post we'll explore two approaches for looping through arrays; using a standard for loop and working with a dojo implementation of one of the ...

An easy way to add interactivity to your ArcGIS JavaScript applications is through info windows that display information in response to a user action. From working with other APIs, you might know info windows as ''balloons'', ''map tips'', ''callouts'', or ''popups''. The concept is the same: the user clicks or hovers over a location on the map ...

Yesterday I added a new dijit to the ArcGIS API for JavaScript Code Gallery: the Lens Dijit. It could also be called an X-Ray dijit. Here's a screen shot: Everything you need to get started using it is in the ReadMe.txt included in the download but, if you just want to take it for a spin, you can try it here:  lens dijit demo. Please ...

In this post we'll answer a question that comes up frequently in the ArcGIS API for JavaScript section of the ESRI Discussion Forum, ''How do I populate a ComboBox with unique values''? Create a ComboBox First let's look at how to build a ComboBox, in this example, we'll use the Dojo ComboBox dijit (read more details on why at the end of this ...

The GeoChalkboard Blog recently published a post about using the dojo.ItemFileReadStore (IFRS). That post does a good job of introducing and discussing basic usage of the ItemFileReadStore, but it leaves out one important aspect, the Type Map. Natively, an IFRS allows you to store primitive JavaScript types such as strings and numbers. If you ...

If you're developing with the ArcGIS API for JavaScript, or you want to get started, there's plenty to learn at the 2009 ESRI International User Conference. Here's what you can look forward to. Special Interest Group Come join fellow JavaScript developers at the first ArcGIS API for JavaScript SIG. We are proud to have Dylan Schieman, CEO of ...

Two must-see technology evangelists will be giving talks at the ESRI User Conferece. Dylan Schieman, CEO of SitePen and Co-founder of the Dojo Toolkit, and Kevin Hoyt who is a Platform Evangelist with Adobe Systems Inc.Dylan will be talking on Tuesday, July 14, 12pm - 1pm, Room 15A at the ArcGIS API for JavaScript Special Interest Group meeting. ...

Versions 1.4 of the ArcGIS JavaScript API and the ArcGIS JavaScript Extension for the Google Maps API have been released. Version 1.4 of the ArcGIS JavaScript Extension for Microsoft Virtual Earth will be available soon. (Update on June 12, 2009: The Virtual Earth extension is now available) To use the new versions, just update your script ...

Dijits (Dojo widgets) have been a semi-regular topic on this blog and those posts helped me get up to speed on how to develop my own dijit for use with the ArcGIS JavaScript API. One requirement that has come up a couple of times when I've worked with the JavaScript API is the need to zoom to a state and/or county. Since I figured I'd continue to ...

In a previous blog post, we learned how to create a simple dijit with the ArcGIS JavaScript API that combines a map with a couple of buttons and an image. Today's post will show how to create a sophisticated task-oriented dijit, which we have uploaded to the ArcGIS JavaScript API Code Gallery. The dijit encapsulates the IdentifyTask to let users ...