|By Michael Earls||
|May 20, 2005 11:00 AM EDT||
One of the most basic ways to navigate within an application is by use of a tab control. Tabs are easy to use and users are very familiar with them. There have been many implementations of tab controls for Web applications, but they had often required advanced client-side script that was only supported in a few browsers, or they required extensive and confusing server-side include files. ASP.NET 2.0 provides a few things that make this easier to do with no dependency on functional code. In this article I'll show you how you can use the new features of ASP.NET 2.0 to easily create a tab control for your Web application.
To get started, create a new Web site (use your favorite language) on your computer and call it TabDemo. ASP.NET 2.0 introduces a new set of data providers and controls based on the notion of a site map. The site map is the central data store for site navigation data. Let's start by defining a simple site map that we can use for our site. Add a new sitemap to the site (use the default name of Web.sitemap). Listing 1 shows a simple sitemap that will demonstrate the tabs nicely.
Now that we have our sitemap, we can continue with the actual user interface. To get the most benefit from the tab control, we'll use a master page to keep everything together. Add a new master page to your Web site and call it MasterPage.master (see Figure 1).
In order to make our tabs seem as though they're physically connected to our content, we'll need to create a master HTML table to contain the tabs. Delete the code between the <form> and </form> tags in the MasterPage.master file and replace it with the HTML in Listing 2.
That will give us the main table that will hold all of our content (including our tab control). Now we need to define the table that actually holds our tabs and the tab "panels." Let's take a look at Listing 3. It shows the HTML that we should put into the TD with the ID of ContentContainer.
Notice the use of the TD with the CSS class TabMenuSpacer. This cell forces the empty area behind the tabs to take up all of the excess space to the right of the menu. We need to add the SiteMapDataSource to our page so that the menu will be bound to our site map. This is easy to do. Simply add the following code just below the main table:
<asp:SiteMapDataSource ID="TabMenuSitemap" runat="server" ShowStartingNode="false" />
This adds a new SiteMapData-Source to the page. Since we used the default name of Web.sitemap for our site map, ASP.NET will automatically use it as the main site map for the site, so we don't have to do anything else. If you add another site map to the site, you'll need to define a new site map provider to the web.config file that points to your new site map, and then set the SiteMapProvider property of the SiteMapDataSource to your new site map provider. It's also important to point out that we set the ShowStartingNode property to false. We did this because we have a flat site map and we don't want to show the top-most parent node for our menu (since the site map is defined in XML, we had to have a root node, even though we'll never use it).
Let's go ahead and take a look at what we have so far. Delete the Default.aspx page that Visual Studio added to your site and replace it with a new Default.aspx page. This time, when you add the page, check the box labeled "Select master page." Then select MasterPage.master as the master page. Build and run the Web application. At this point, you'll see a very simple page that doesn't look like a whole lot (see Figure 2).
The reason our page looks so odd is because we haven't yet defined the Cascading Style Sheet for the page. We need to add the CSS that will actually render what we have as a Tab menu. Add a new style sheet to your project and name it Stylesheet.css. Then, add the following to the <head> of MasterPage.master:
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
This will link in the new style sheet. Let's take a look at the individual styles that make up our tab control. We'll start with the CSS class named TabMenuContainer. This style is applied to the entire tab menu. We just need to make sure that we have a top border so that our menu has a lid on it.
border-top: solid 1px black;
The next style that we're concerned with is the TabMenuItem. This is the style that is applied to all of our tabs in their unselected state.
border: solid 1px black;
padding: 3px 3px 3px 3px;
Notice that we've defined a border with a single pixel black line. We then set the left border to be nothing. This is actually an intentional move that prevents the tabs from looking bad against the border of the main container.
The secret to this whole method is in the next style. This is the style that is applied to the selected menu item:
border-right: solid 1px black;
padding: 5px 3px 5px 3px;
We set the bottom border to "none" and the background color to white. This will allow the tab to look as if it is attached to the content cell. We also set the top border to "none" to give the selected tab just a little more height than the other tabs.
Since we want our tab panels (the cell that contains the Content-PlaceHolder control) to be the same height from page to page, we should set them to be a specific height. Once again, we use CSS to define a style to do this. In the HTML for the master page we added a table cell to the right of the content container and set its CSS class to SiteContentSpacer. Let's set the style for that to be a specific height.
Not only did we set the height of the content to 200 pixels (a very small number just for demonstration purposes), but we also made the cell invisible. Listing 4 shows the entire style sheet that contains all of the styles used to make our tab control demo.
Once we've added the remaining styles to the style sheet, we can take a look at the final product. Figure 3 shows a screenshot of the resulting page with our tab control and all of the styles defined.
The tab control is a very useful user interface element that is common to many applications. With the introduction of master pages, SiteMapDataSource, and the menu control in ASP.NET 2.0, creating tabs in Web applications is easy. Best of all, once you have the master page set up for tabs, all you have to do to use them is to set the master page on your new Web forms and edit the page as you normally would. Also, since the solution relies on CSS, these tabs work in the latest Web browsers without any client-side coding.
|Aravind 05/06/08 09:09:19 AM EDT|
Great work, Thank you so much.
|Tony 04/02/08 04:22:56 PM EDT|
Thank you very much, I have been looking for a nice simple way to do this. Awesome article.
|Pranoti 03/07/08 03:18:06 PM EST|
Thank your very much, your tutorial helped me a lot
|Saurabh 01/28/08 10:49:37 PM EST|
It's really awesome. It really works. Thanks a lot. Really nice article.
|Aseem 12/20/07 06:07:54 AM EST|
Thanks for the easy to follow instructions in the article. How do we add a second layer to our tab navigation? IE when you click on one tab, the subtabs for that tab appear. Any help would be great also I need it urgently. Please help it out.
|Dave 11/26/07 02:05:38 PM EST|
Thanks for the easy to follow instructions in the article. How do we add a second layer to our tab navigation? IE when you click on one tab, the subtabs for that tab appear. Any help would be great.
|AK 11/16/07 04:51:45 PM EST|
Great! Worked really good for me first time, may have to make a dummies version for the less experienced...
|Rob 08/08/07 06:19:13 PM EDT|
Thanks for sharing that. Instructions were great and it all worked first time. I'm used to the tab control in Access and its good to have it in asp.net
|ChuckO 06/14/07 03:39:41 PM EDT|
The information in this article is not all correct. I followed his instructions and get the following error.
Content controls have to be top-level controls in a content page or a nested master page that references a master page.
|John Bowyer 12/30/05 03:35:37 AM EST|
I have implemented the tab control as documented to the best of my ability and it appears to have missing ingredients from the article.
When I select a tab, it does not highlight. In short it does not look like a tab at all. I also have dynamic mouse flyouts.
The article specifies as a class: TabMenu that is not inclided in Listing 1.
So, you bought into the current machine learning craze and went on to collect millions/billions of records from this promising new data source. Now, what do you do with them? Too often, the abundance of data quickly turns into an abundance of problems. How do you extract that "magic essence" from your data without falling into the common pitfalls? In her session at @ThingsExpo, Natalia Ponomareva, Software Engineer at Google, will provide tips on how to be successful in large scale machine lear...
May. 1, 2016 01:45 PM EDT Reads: 1,182
Digital payments using wearable devices such as smart watches, fitness trackers, and payment wristbands are an increasing area of focus for industry participants, and consumer acceptance from early trials and deployments has encouraged some of the biggest names in technology and banking to continue their push to drive growth in this nascent market. Wearable payment systems may utilize near field communication (NFC), radio frequency identification (RFID), or quick response (QR) codes and barcodes...
May. 1, 2016 01:30 PM EDT Reads: 780
SYS-CON Events announced today that Stratoscale, the software company developing the next generation data center operating system, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Stratoscale is revolutionizing the data center with a zero-to-cloud-in-minutes solution. With Stratoscale’s hardware-agnostic, Software Defined Data Center (SDDC) solution to store everything, run anything and scale everywhere...
May. 1, 2016 01:30 PM EDT Reads: 1,557
Angular 2 is a complete re-write of the popular framework AngularJS. Programming in Angular 2 is greatly simplified – now it's a component-based well-performing framework. This immersive one-day workshop at 18th Cloud Expo, led by Yakov Fain, a Java Champion and a co-founder of the IT consultancy Farata Systems and the product company SuranceBay, will provide you with everything you wanted to know about Angular 2.
May. 1, 2016 01:00 PM EDT Reads: 1,736
You think you know what’s in your data. But do you? Most organizations are now aware of the business intelligence represented by their data. Data science stands to take this to a level you never thought of – literally. The techniques of data science, when used with the capabilities of Big Data technologies, can make connections you had not yet imagined, helping you discover new insights and ask new questions of your data. In his session at @ThingsExpo, Sarbjit Sarkaria, data science team lead ...
May. 1, 2016 12:45 PM EDT Reads: 773
SYS-CON Events announced today that Men & Mice, the leading global provider of DNS, DHCP and IP address management overlay solutions, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. The Men & Mice Suite overlay solution is already known for its powerful application in heterogeneous operating environments, enabling enterprises to scale without fuss. Building on a solid range of diverse platform support,...
May. 1, 2016 12:15 PM EDT Reads: 2,315
SYS-CON Events announced today that Peak 10, Inc., a national IT infrastructure and cloud services provider, will exhibit at SYS-CON's 18th International Cloud Expo®, which will take place on June 7-9, 2016, at the Javits Center in New York City, NY. Peak 10 provides reliable, tailored data center and network services, cloud and managed services. Its solutions are designed to scale and adapt to customers’ changing business needs, enabling them to lower costs, improve performance and focus inter...
May. 1, 2016 12:00 PM EDT Reads: 1,110
You deployed your app with the Bluemix PaaS and it's gaining some serious traction, so it's time to make some tweaks. Did you design your application in a way that it can scale in the cloud? Were you even thinking about the cloud when you built the app? If not, chances are your app is going to break. Check out this webcast to learn various techniques for designing applications that will scale successfully in Bluemix, for the confidence you need to take your apps to the next level and beyond.
May. 1, 2016 11:45 AM EDT Reads: 1,485
In his session at @ThingsExpo, Chris Klein, CEO and Co-founder of Rachio, will discuss next generation communities that are using IoT to create more sustainable, intelligent communities. One example is Sterling Ranch, a 10,000 home development that – with the help of Siemens – will integrate IoT technology into the community to provide residents with energy and water savings as well as intelligent security. Everything from stop lights to sprinkler systems to building infrastructures will run ef...
May. 1, 2016 11:00 AM EDT Reads: 842
Whether your IoT service is connecting cars, homes, appliances, wearable, cameras or other devices, one question hangs in the balance – how do you actually make money from this service? The ability to turn your IoT service into profit requires the ability to create a monetization strategy that is flexible, scalable and working for you in real-time. It must be a transparent, smoothly implemented strategy that all stakeholders – from customers to the board – will be able to understand and comprehe...
May. 1, 2016 11:00 AM EDT Reads: 1,085
Increasing IoT connectivity is forcing enterprises to find elegant solutions to organize and visualize all incoming data from these connected devices with re-configurable dashboard widgets to effectively allow rapid decision-making for everything from immediate actions in tactical situations to strategic analysis and reporting. In his session at 18th Cloud Expo, Shikhir Singh, Senior Developer Relations Manager at Sencha, will discuss how to create HTML5 dashboards that interact with IoT devic...
May. 1, 2016 09:45 AM EDT Reads: 989
Artificial Intelligence has the potential to massively disrupt IoT. In his session at 18th Cloud Expo, AJ Abdallat, CEO of Beyond AI, will discuss what the five main drivers are in Artificial Intelligence that could shape the future of the Internet of Things. AJ Abdallat is CEO of Beyond AI. He has over 20 years of management experience in the fields of artificial intelligence, sensors, instruments, devices and software for telecommunications, life sciences, environmental monitoring, process...
May. 1, 2016 09:45 AM EDT Reads: 917
SYS-CON Events announced today that Ericsson has been named “Gold Sponsor” of SYS-CON's @ThingsExpo, which will take place on June 7-9, 2016, at the Javits Center in New York, New York. Ericsson is a world leader in the rapidly changing environment of communications technology – providing equipment, software and services to enable transformation through mobility. Some 40 percent of global mobile traffic runs through networks we have supplied. More than 1 billion subscribers around the world re...
May. 1, 2016 07:30 AM EDT Reads: 960
There is an ever-growing explosion of new devices that are connected to the Internet using “cloud” solutions. This rapid growth is creating a massive new demand for efficient access to data. And it’s not just about connecting to that data anymore. This new demand is bringing new issues and challenges and it is important for companies to scale for the coming growth. And with that scaling comes the need for greater security, gathering and data analysis, storage, connectivity and, of course, the...
May. 1, 2016 07:00 AM EDT Reads: 829
SYS-CON Events announced today that DatacenterDynamics has been named “Media Sponsor” of SYS-CON's 18th International Cloud Expo, which will take place on June 7–9, 2016, at the Javits Center in New York City, NY. DatacenterDynamics is a brand of DCD Group, a global B2B media and publishing company that develops products to help senior professionals in the world's most ICT dependent organizations make risk-based infrastructure and capacity decisions.
May. 1, 2016 06:30 AM EDT Reads: 2,493
Machine Learning helps make complex systems more efficient. By applying advanced Machine Learning techniques such as Cognitive Fingerprinting, wind project operators can utilize these tools to learn from collected data, detect regular patterns, and optimize their own operations. In his session at 18th Cloud Expo, Stuart Gillen, Director of Business Development at SparkCognition, will discuss how research has demonstrated the value of Machine Learning in delivering next generation analytics to im...
Apr. 30, 2016 04:15 PM EDT Reads: 1,689
This is not a small hotel event. It is also not a big vendor party where politicians and entertainers are more important than real content. This is Cloud Expo, the world's longest-running conference and exhibition focused on Cloud Computing and all that it entails. If you want serious presentations and valuable insight about Cloud Computing for three straight days, then register now for Cloud Expo.
Apr. 30, 2016 02:30 PM EDT Reads: 1,726
IoT device adoption is growing at staggering rates, and with it comes opportunity for developers to meet consumer demand for an ever more connected world. Wireless communication is the key part of the encompassing components of any IoT device. Wireless connectivity enhances the device utility at the expense of ease of use and deployment challenges. Since connectivity is fundamental for IoT device development, engineers must understand how to overcome the hurdles inherent in incorporating multipl...
Apr. 30, 2016 02:15 PM EDT Reads: 1,467
The increasing popularity of the Internet of Things necessitates that our physical and cognitive relationship with wearable technology will change rapidly in the near future. This advent means logging has become a thing of the past. Before, it was on us to track our own data, but now that data is automatically available. What does this mean for mHealth and the "connected" body? In her session at @ThingsExpo, Lisa Calkins, CEO and co-founder of Amadeus Consulting, will discuss the impact of wea...
Apr. 30, 2016 01:15 PM EDT Reads: 688
We’ve worked with dozens of early adopters across numerous industries and will debunk common misperceptions, which starts with understanding that many of the connected products we’ll use over the next 5 years are already products, they’re just not yet connected. With an IoT product, time-in-market provides much more essential feedback than ever before. Innovation comes from what you do with the data that the connected product provides in order to enhance the customer experience and optimize busi...
Apr. 30, 2016 11:15 AM EDT Reads: 901