Removing overlays

    "Overlays"....!!! What is this now! Never heard or used it before? You might immediately say "NO"...But, actually all of you have already seen what an overlay is and you have also used it! Now you would say "When!?!?" Well, all of the markers, polylines, polygons that you have created are overlays. Overlays are objects on the map that are tied to latitude/ longitude coordinates, so they move when you drag or zoom the map. Overlays reflect objects that you add to the map to designate points, lines, areas or collection of objects.

    Till now we have seen how to create an overlay. In today's example we will see how to remove an overlay. In this example we will create markers on click. But the difference will be that when you create a new marker, the earlier one will disappear from the map. So at any given time there would only be one single marker on the map! Note that removing the marker does not delete the overlay; it simply removes the overlay from the map.

    Let's head on to the example. You can copy the following code in a text file and save it with .html extension. Now click on this file and it will open up in your default browser and you will see the map in action!

    The code is very simple. You should have no problems in understanding the same. If you have any queries or doubts regarding the code, you can leave a comment or drop me a mail. The output of the above example is as seen in the result section above.

Comments

Recommended for You

Fusion Table Layer...

Today we will have a look at the "Fusion Table" Layer example. But before we start with the actual code, we will have a look at what Fusion Table is. Google Fusion Table is a free service for sharing and visualizing data online. It allows you to share data, merge data from multiple tables into interesting derived tables, and see the most up-to-date data from all sources. There is a lot of documentation about Google Fusion Table available on the web. You can visit their home page or the Google Research Blog to gather more information about Fusion Tables. Let us have a look at the following code. The code is very short and simple to understand! The few things to look out for in the above code are: The manner in which mapTypeId has been specified! In other Google Maps API v3 examples, we have seen that we specify mapTypeID as ROADMAP, SATELLITE, etc. i.e., all the letters are in uppercase and not in quotes! However, in this...

ES6 101 - Class

Spatial Unlimited changes to The UI Dev After being hosted on blogger 😣 for the last 6 years 📆, this page has finally been moved to Github.io This means a few things for you, dear reader! You will be redirected to the new page shortly! ⏩ ⏩ ⏩ Once crapy HTML is now better looking Markdown ! 😍 😍 The entire blog is a Github repo ! 😍 😍 Spatial Unlimited is now The UI Dev 😍 😍

Hilarious Google Maps

I came across these simple yet wonderfully done illustrations based on the Google Maps Street style by Christoph Niemann - Illustrator for the Times Magazine. These illustrations are absolutely stunning show of creativity, design, execution and general beauty. All the illustrations show exactly how it is on the roads in New York. Sit back and enjoy the show.

Google Map's Real-Time Traffic Layer...

You can now check the traffic condition on the road before you leave for work, or a party or to your friend's place. Google's Traffic layer shows the traffic conditions in your area - LIVE!!! Live traffic data is available in major cities in the United States, France, Britain, Canada and Australia, with new cities and countries frequently added. The Google Maps API allows you to add real-time traffic information (where supported) to your maps using the TrafficLayer object. Traffic information is provided for the time at which the request is made. Consult this spreadsheet to determine traffic coverage support. Let us now have a look at the Google Maps API - Trafiic Layer example. Copy the following code in a simple text file and save it as html. Click on this html file and it will open in your default browser. You will then see the traffic conditions in your area - LIVE... The output of the above code looks as seen in the r...

Satellite to keep eye on Chambal, Palpur Kuno sanctuaries

In a bid to check the rising incidents of poaching and keep an eye on the flora and fauna of the two sanctuaries in Madhya Pradesh, the government has decided to use satellite to monitor the Chambal and Palpur Kuno region. The basic field technique, which is used currently, to maintain a log of the region’s vegetation, wildlife does not give the real time data. Therefore, the government has decided to use the Geographical Information System (GIS) Global Positioning System (GPS) for the purpose. Madhya Pradesh’s leading animal scientist Dr. RJ Rao, who has received training in such satellite monitoring of national reserves from California, said the program ‘ARC Q-9’ is proving to be of great use in protection of the wildlife. They have used the program to prepare a database of the whole Chambal and Kuno region, said Rao. Sourc...

The UI Dev

Search This Blog