Now, the only question is: where is anywhere? Is it a phone, tablet or Ultrabook? Those are obvious. Skip Article Header. Skip to: Start of Article. Web apps can run in a browser anywhere on any device, desktop, server, etc. This is an app that will automatically resize based on the browser and screen size; automatically detect and change the user interface UI to reflect that of the platform on which the app is running; and will change according to the orientation of the device.
HTML5 app performance is much different within the confines of a mobile webview in comparison to a desktop browser. Too many DOM manipulations, memory leaks, poor choices in JavaScript libraries and other issues can drag your app to a crawl.
HTML5 requires a different approach to programming compared to a desktop, where resources are plentiful and fast. Instead of choosing a side, many developers are finding that they should use whatever works best for the task at hand—be it HTML5, native code, or a hybrid approach.
HTML5 was supposed to solve all sorts of compatibility and speed problems. In , Facebook famously decided to build everything in HTML5 and then reversed course just two years later.
Back then, HTML5 was slower than native code, couldn't access device functions, and didn't have an immersive feel. Today, while there has been a lot of progress in HTML5, there's still no one-code-fits-all solution.
HTML5 mobile apps have clear advantages. They can be cheaper and easier to create because so many people know JavaScript. Speed has also improved. It's difficult to quantify how much over the bar it is in terms of the requirement, but it definitely is over the bar. Smartphones and networks are also much faster. GeekBench shows that the latest iPhone is ten times faster than a era 3GS, for example.
In addition, there's a growing choice among third-party software that extends the capabilities of HTML5 to better match native apps—even providing access to some device features.
However, HTML5 is risky. Right-click the project node in the Projects window and choose Run in the popup menu. When you run an application, the IDE automatically opens the application in the selected browser or mobile device and opens the Browser Log in the Output window.
If more than one project is open you can specify one of the projects as the Main Project. After you specify the project as the Main Project, the F6 keyboard shortcut will always run the Main Project regardless of the project that is selected in the Projects window. After you install the extension you can perform the following tasks in the Chrome browser:. Do not close the infobar in the tab in the Chrome browser that informs you that "NetBeans Connector is debugging this tab".
Closing the infobar will disconnect the IDE from the Chrome browser. After downloading, you can perform the following steps to install the NetBeans extension for the Chrome browser.
To install the NetBeans extension for Chrome:. Alternatively, you can select a target browser for the project from the drop-down list in the toolbar. You will see an infobar in the tab in the Chrome browser that informs you that "NetBeans Connector is debugging this tab".
If you are unable to connect to the Chrome Web Store you can install the NetBeans Connector extension manually by performing the following steps. To install the Chrome extension manually:. Drag the NetBeans Connector extension netbeans-chrome-connector. When Inspect mode is enabled, information about some of the actions that you perform in the browser such as selecting and highlighting elements is communicated to the IDE. When you run the application, you can use your browser to help you locate HTML elements in your source code.
When you select or place your cursor over elements in the browser window, the element is simultaneously highlighted or selected in the Browser DOM window of the IDE. When you select an element, the style rules for the element are automatically displayed in the Selection tab of the CSS Styles window.
To inspect your application with a browser:. Set the target browser for the application to one of the browsers or devices listed in top row in the browser selection drop-down list. The browsers and devices in the top row of the browser selection drop-down list support Inspect mode. When you run the application the target browser opens and displays the index page or file in the window.
When you move your cursor over or select an element in the browser the contents of the following windows in the IDE are updated to synchronize with your actions in the browser.
Browser DOM window. When you move your cursor over an element in the browser the element is highlighted in the Browser DOM window. You can double-click an element in the window to open the source file in the editor. CSS Styles window. You can edit the rules for the element in the CSS Styles window. When you enable the Inspect mode in the browser, any element that is in the 'hover' state remains in the state until you disable the Inspect mode.
You can select an element in the hover state and inspect and modify the properties of the hover state and view the changes to the element in your browser.
A single HTML5 application might be viewed on various devices with different screen sizes. The IDE can help you develop projects that can respond and adapt to different display devices by enabling you to view pages at different screen sizes. When you run the HTML5 application from the IDE you can choose to view the pages in one of the default screen sizes or create a custom screen size.
You can view your application in any browser, but if you want to be able to quickly switch between screen sizes you need to specify one of the following integrated browsers as the target browser:. When you view the application in one of the integrated browsers you can choose the display size in a menu in the browser.
You can specify the target browser for the application in the Project Properties window or in the Set Project Configuration drop-down list in the toolbar of the IDE. The integrated browsers provide menus that enable you to switch between common screen sizes that are pre-configured in the menu. When you select a new screen size the display area of the browser resizes to the selected size.
By changing the screen size you can view how the layout of the application responds to different sizes, for example, as a result of media queries that are specified in the style sheet.
After you launch the application you can select a screen size from the menu in the browser. The location of the menu for selecting the screen size options depends upon the target browser. Chrome with NetBeans Connector. Embedded WebKit Browser. Select a screen size in the Other Options menu or click an icon in the toolbar. The toolbar in the Web Browser window contains the following elements. Display device icons. Click a display device icon to resize the display area to the selected size.
You can place your cursor over an icon to display the dimensions of the display device. You can modify which icons are displayed in the toolbar by choosing Customize in the Other Options drop-down list.
Other Options menu. Select a window size in the drop-down list to view the page contents in the selected window size. The drop-down list displays all the available window sizes. Choose Customize to open a dialog that enables you to modify, create or remove window sizes.
Magnification selector. Type a value in the text field or select a value in the drop-down list to change the magnification of the contents of the page. Pages are rendered using the WebKit browser engine running on the embedded lightweight server localhost You can modify the server details in the Project Properties window. You can create custom sizes for windows by selecting Customize in the screen size menu.
When you select Customize the browser displays a window that enables you to create a new size and to modify the default screen size options. You can also edit the contents of the menu. You can use the IDE to create a site template that is based on your project by performing the following steps. After you create a rule you can add declarations to the rule by editing the style sheet in the editor or in the CSS Styles window. The browser — even at this point — has become a commodity.
As long as it adheres to a standard, I think it will do okay. People are going to be more worried about what HTML5 Apps they can run on their browser than what browser they are using. Think about going from radio to TV. No distribution channels like the Apple App Store and Android app store dominate. Then there are novel uses like Valve, the video game development and digital distribution company, is doing with game distribution, as well as Netflix with movies.
These distribution channels seem to be how users will organize themselves. Though each browser has its own things going on, by-and-large, we are doing okay. For example, you can always put some content on a webpage and have it delivered to the user and know that — in some fashion — the user will be able to see it. Can you imagine if a company starts to think they are going to redefine the web from the bottom up and have complete control of the standards?
This fact gave standards bodies like W3C immense power to get browsers to stay on the same path. The second part is that browsers are hard to make. Billions of web pages — lots with really bad markup. Also, we choose to use HTML in new ways like microformats so even conventions can change midstream on browsers. A small club is exactly what we have today.
Tons of browsers are built on top of those engines. So here we are: Standards and browser vendors have created a choke point where pretty much anything you want to do one the web has to flow through them. This freaks a lot of people out, but what I think it means is that finalizing the standards take a really long time. Browser vendors are free to start implementing this stuff now — and they have been most everyone except Internet Explorer.
This seems like a completely reasonable way to develop. At any given time, there is going to be a hugely varied crop of browsers out there. Using sites like caniuse and QuirksMode will help. Along with that, there are great feature detection libraries like Modernizer.
The Application Cache, of course. The new hotness is Indexed Database — it has support from all major browser vendors. Thankfully, we have support for these standards in WebKit browsers, Firefox, and it should be coming in IE9.
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