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14.07.2014
O SlideShare utiliza cookies para otimizar a funcionalidade e o desempenho do site, assim como para apresentar publicidade mais relevante aos nossos usuarios. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. The CSS framework YAML provides developers and designers with a starting point for their web application and design work.
Web design with CSS, HTML, and JavaScript has evolved to the point where web application interfaces often rival their desktop counterparts. Getting your design to work in every operating system and browser combination is time consuming and, quite frankly, a pain. The YAML site describes it as "A modular framework for truly flexible, accessible and responsive websites." As the documentation states, YAML provides a cross-browser compatible, functional, modular skeleton layout, which contains all of the most often used page elements. While YAML is not a prepackaged layout, it does provide a tool called YAML Builder to quickly build a layout based on YAML features (Figure A). Once you settle on a design, the code for your layout may be retrieved via the Get Code button. The YAML source files contain import directives that reference other files within the framework, so you should be careful about changing the directory structure. All the technologies (CSS, HTML, JavaScript, etc.) are there for you to use, so why utilize something you did not create?
There are many web designers and developers who turn their noses up at frameworks because they believe you should create your own code; this is debatable because most developers reuse designs over and over, which is along the lines of what frameworks do. Tony Patton has worn many hats over his 15+ years in the IT industry while witnessing many technologies come and go. Recently in a project I encountered the following problem: The development team used Git with a branch-per-feature-like workflow and the integration server, Bamboo in this case, was configured not only to run the integration-tests for the master-branch but also for every change in a feature branch.
As the teamĀ  developed a Java EE web application ports like 8080 occasionally were already bound and builds failed.


I knew a plug-in for Jenkins CI I to search for available ports and assign them to a build variable but I wanted to control such information directly within the Maven build life-cycle so I searched and finally found Sonatype’s Port Allocator Plug-in for Maven. In the following short example I’m going to demonstrate how to allocate available random ports in a Maven build and assign them to an embedded servlet container. We’re simply programming a web application that does nothing more than to print the port used to the browser.
The web applications runs on an embedded Jetty server that we’re setting up programmatically using a port that is passed into our application as parameter.
Finally we’re using the Maven Exec Plugin to run our Java class with the web-server and with the random port from the Maven variable as parameter.
We may ignore the dependencies for Jetty here, it’s just needed to write the servlet and configure the embedded servlet container instance. The interesting part is the port-allocator-plugin configuration: Here we configure the plugin to detect an available random port and write the port number to a Maven variable named tomcat-port. The following simple servlet does nothing more than to print the port number to the browser window. Our web server consists of one single Java class with the static main method that takes the port number as parameter and initializes an embedded Jetty server listening on this port.
However, there are still caveats and workarounds that can make creating a design from the ground up a daunting task.
The layout dialog in Figure B has been docked in the left area of the browser window (by clicking the icon in the upper right of the dialog), whereas it was floating in Figure A.
It opens the modal window displayed in Figure D, where it provides the web page code as well as the necessary CSS files.
The introduction page provides information on the various files in the framework with more details in the documentation.
For starters, it has a steep learning curve; after all, there is a lot in the YAML source files, and it takes a while to figure out how it works.


Even if you do not utilize these frameworks, you can learn a lot by taking them for a test drive and looking at their code to see how they tackle various situations. CSS frameworks like YAML (Yet Another Multicolumn Layout) provide a base so you can worry about overall site design instead of the many quirks of web design. You choose features in the Options dialog (on the left in Figure A), and it is laid out in the browser window.
The Toggle View button at the bottom left of Figure B allows you to view the design loaded in the browser as displayed in Figure C.
The design utilizes YAML, so it assumes you will have YAML files installed in your environment.
This means you can worry about designing a site and not the many quirks of web development. The grids come into play when laying out the individual columns—YAML utilizes its own feature called subtemplates for building flexible grid-based designs. In addition, there seems to be some code bloat in it—just a lot of code to load, though I am not the one to point out specific instances. While I prefer YAML due to my experience with it, there are a number of such frameworks available and many do a great job, including YUI, 960 Grid System, and Blueprint. At this point, you take the skeleton and modify the layout (if necessary) to fit your needs. When using YAML, you rely upon its developer and the community to keep it up-to-date and this type of crutch makes many developers cringe, but that is a drawback with any framework.



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