Skip to main content

ColdFusion 10: Geo-location on a Google map created with CFMAP tag

In ColdFusion 10, you can now show the users location on a Google map created with the CFMAP tag. The CFMAP and CFMAPITEM tags now have a boolean attribute showuser. When set to true the browser would ask for the users permission and then display users geo-location on the map. This is now supported in most of the modern browsers. In cases where the browser doesn’t support Geo-location API then the values provided in centeraddress or centerlatitude\centerlongitude attributes will be used to add a marker in the Google map.

Here’s an example:

<cfmap showuser="true" centeraddress="Sydney, Australia"> </cfmap> <!--- or this ---> <cfmap showuser="true" centerlatitude="-33.52" centerlongitude="151.13"> </cfmap>
Once the user provides the permission to the site to display it's location, a map showing the users' location is presented:

CFMAP_geolocation
As mentioned earlier, the attribute showuser is available in CFMAPITEM tag as well:

<cfmap centeraddress="Sydney, Australia"> <cfmapitem showuser="true" address="Perth, Australia"> </cfmapitem> <cfmapitem address="Melbourne, Australia"> </cfmapitem> </cfmap>
Output:
CFMAPITEM_geolocation
Here a marker is added to the map that indicates the users location. In any case if the user denies the access to its location then the marker is added at the specified address or latitude\longitude.

Comments

Popular posts from this blog

How to use the APP_INITIALIZER token to hook into the Angular bootstrap process

I've been building applications using Angular as a framework of choice for more than a year and this post is not about another React vs Angular or the quirks of each framework. Honestly, I like Angular and every day I discover something new which makes development easier and makes me look like a guy who built something very complex in a matter of hours which would've taken a long time to put the correct architecture in place if I had chosen a different framework. The first thing that I learned in Angular is the use of the APP_INITIALIZER token.

On GraphQL and building an application using React Apollo

When I visualize building an application, I would think of using React and Redux on the front-end which talks to a set of RESTful services built with Node and Hapi (or Express). However, over a period of time, I've realized that this approach does not scale well when you add new features to the front-end. For example, consider a page that displays user information along with courses that a user has enrolled in. At a later point, you decide to add a section that displays popular book titles that one can view and purchase. If every entity is considered as a microservice then to get data from three different microservices would require three http  requests to be sent by the front-end app. The performance of the app would degrade with the increase in the number of http requests. I read about GraphQL and knew that it is an ideal way of building an app and I need not look forward to anything else. The GraphQL layer can be viewed as a facade which sits on top of your RESTful services o...

Using MobX to manage application state in a React application

I have been writing applications using React and Redux for quite some time now and thought of trying other state management solutions out there. It's not that I have faced any issues with Redux; however, I wanted to explore other approaches to state management. I recently came across MobX  and thought of giving it a try. The library uses the premise of  `Observables` to tie the application state with the view layer (React). It's also an implementation of the Flux pattern wherein it uses multiple stores to save the application state; each store referring to a particular entity. Redux, on the other hand, uses a single store with top-level state variables referring to various entities.