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| <path d="m -30.254972,292.46861 c 0.153663,-0.13318 0.314647,-0.25107 0.463193,-0.37852 -0.148463,0.12751 -0.303257,0.25016 -0.463193,0.37852 l 0,0 z" id="path3639" style="fill:url(#SVGID_9_)" /> |
| <path d="m -30.233189,292.45636 c 0,0 0.0052,-0.006 0.01127,-0.001 l 0,0 0,0 0,0 c 0,0 -0.0052,0.006 -0.01127,0.001 z" id="path3641" style="fill:#be202e" /> |
| <path d="m -30.233189,292.45636 c 0,0 0.0052,-0.006 0.01127,-0.001 l 0,0 0,0 0,0 c 0,0 -0.0052,0.006 -0.01127,0.001 z" id="path3643" style="opacity:0.35;fill:#be202e" /> |
| <path d="m -30.233189,292.45636 c 0,0 0.0052,-0.006 0.01127,-0.001 l 0,0 0,0 0,0 c 0,0 -0.0052,0.006 -0.01127,0.001 z" id="path3654" style="fill:url(#SVGID_10_)" /> |
| </g> |
| <text id="text3761" y="61.094482" x="290" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:40px;line-height:125%;font-family:Oswald;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" xml:space="preserve"> |
| <tspan y="61.094482" x="290" id="tspan3763">The</tspan> |
| </text> |
| <text id="text3416" y="72.094482" x="356" style="font-style:normal;font-variant:normal;font-weight:bold;font-stretch:normal;font-size:57.5px;line-height:125%;font-family:Oswald;text-align:start;letter-spacing:0px;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" xml:space="preserve"> |
| <tspan y="72.094482" x="356" id="tspan3418">Apache Velocity Project</tspan> |
| </text> |
| <path id="path3557" d="m 897.15,23.54449 0,1.58889 3.72099,0 0,10.51111 1.72469,0 0,-10.51111 3.74815,0 0,-1.58889 -9.19383,0 z m 21.49753,0 -4.15555,8.44691 -4.18272,-8.44691 -2.07778,0 0,12.1 1.58889,0 0,-9.60123 4.11482,8.32469 1.1,0 4.11481,-8.32469 0,9.60123 1.58889,0 0,-12.1 -2.09136,0 z" style="fill:#6d6e71" /> |
| <text id="text3599" y="114.09448" x="400" style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-size:35px;line-height:125%;font-family:Arial;text-align:start;letter-spacing:0.03em;word-spacing:0px;writing-mode:lr-tb;text-anchor:start;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1" xml:space="preserve"> |
| <tspan y="114.09448" x="400" id="tspan3601">http://velocity.apache.org/</tspan> |
| </text> |
| </svg> |
| </a> |
| |
| </div> |
| <div id="breadcrumb"> |
| <ul><li><a href="http://www.apache.org">apache</a></li><li><a href="/">velocity</a></li><li><a href="/tools/">tools</a></li><li><a href="/tools/2.0/">2.0</a></li><li><a href="#">view layoutservlet</a></li></ul> |
| </div> |
| <div id="middle"> |
| <div id="leftnav"> |
| |
| <style type="text/css"> |
| /* The following code is added by mdx_elementid.py |
| It was originally lifted from http://subversion.apache.org/style/site.css */ |
| /* |
| * Hide class="elementid-permalink", except when an enclosing heading |
| * has the :hover property. |
| */ |
| .headerlink, .elementid-permalink { |
| visibility: hidden; |
| } |
| h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink, h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink, dt:hover > .elementid-permalink { visibility: visible }</style> |
| <h2 id="velocity-tools">Velocity Tools<a class="headerlink" href="#velocity-tools" title="Permanent link">¶</a></h2> |
| <ul> |
| <li><a href="index.html">Overview</a></li> |
| <li><a href="/download.cgi#tools">Download</a></li> |
| </ul> |
| <h2 id="subprojects">Subprojects<a class="headerlink" href="#subprojects" title="Permanent link">¶</a></h2> |
| <ul> |
| <li><a href="generic.html">GenericTools</a></li> |
| <li><a href="view.html">VelocityView</a></li> |
| <li><a href="struts.html">VelocityStruts</a></li> |
| </ul> |
| <h2 id="docs">Docs<a class="headerlink" href="#docs" title="Permanent link">¶</a></h2> |
| <ul> |
| <li><a href="apidocs/index.html">Javadoc</a></li> |
| <li><a href="upgrading.html">Upgrading</a></li> |
| <li><a href="configuration.html">Configuration</a></li> |
| <li><a href="standalone.html">Standalone Use</a></li> |
| <li><a href="frameworks.html">Web Integration</a></li> |
| <li><a href="creating-tools.html">Creating Tools</a></li> |
| <li><a href="tools-summary.html">Tools Summary</a></li> |
| <li><a href="/engine/devel/glossary.html">Glossary</a></li> |
| <li><a href="http://wiki.apache.org/velocity/VelocityFAQ">FAQ</a></li> |
| <li><a href="http://wiki.apache.org/velocity/">Wiki</a></li> |
| </ul> |
| <h2 id="development">Development<a class="headerlink" href="#development" title="Permanent link">¶</a></h2> |
| <ul> |
| <li><a href="changes.html">Changes</a></li> |
| <li><a href="index.html#helping-out">Participating</a></li> |
| <li><a href="dependencies.html">Dependencies</a></li> |
| <li><a href="http://velocity.apache.org/tools/releases/2.0/index.html#Subversion_Repository">Source Code</a></li> |
| <li><a href="http://issues.apache.org/jira/browse/VELTOOLS">Report Issue</a></li> |
| </ul> |
| <h2 id="struts">Struts<a class="headerlink" href="#struts" title="Permanent link">¶</a></h2> |
| <ul> |
| <li><a href="struts.html">Overview</a></li> |
| <li><a href="struts-user-guide.html">User Guide</a></li> |
| <li><a href="apidocs/org/apache/velocity/tools/struts/package-summary.html">Tools</a></li> |
| </ul> |
| |
| <div id="bottom-nav"> |
| <img src="/images/pbv90x30.png"/> |
| <div id="rss"> |
| <a class="poweredBy" href="/rss/news.rss" title="Velocity News Feed"><img class="poweredBy" alt="Velocity News Feed" src="/images/feed-icon-24x24.jpg"></a> |
| </div> |
| <iframe src="http://www.apache.org/ads/buttonbar.html" style="border-width:0; float: left" frameborder="0" scrolling="no" width="135" height="265"></iframe> |
| </div> |
| </div> |
| <div id="content"><div class="section-content"><style type="text/css"> |
| /* The following code is added by mdx_elementid.py |
| It was originally lifted from http://subversion.apache.org/style/site.css */ |
| /* |
| * Hide class="elementid-permalink", except when an enclosing heading |
| * has the :hover property. |
| */ |
| .headerlink, .elementid-permalink { |
| visibility: hidden; |
| } |
| h2:hover > .headerlink, h3:hover > .headerlink, h1:hover > .headerlink, h6:hover > .headerlink, h4:hover > .headerlink, h5:hover > .headerlink, dt:hover > .elementid-permalink { visibility: visible }</style> |
| <h2 id="velocitylayoutservlet-vls-overview">VelocityLayoutServlet (VLS) Overview<a class="headerlink" href="#velocitylayoutservlet-vls-overview" title="Permanent link">¶</a></h2> |
| <p>This is an extension to the basic VelocityViewServlet. It provides a simple layout control and customizable error screens for Velocity Tools based projects. VelocityTools is distributed with an example app demonstrating the use of this servlet.</p> |
| <h2 id="installation">Installation<a class="headerlink" href="#installation" title="Permanent link">¶</a></h2> |
| <p>Since this class is an extension of the VelocityViewServlet (VVS), to use it simply change the servlet-class value of the web.xml entry to the following class:</p> |
| <p><a href="apidocs/org/apache/velocity/tools/view/servlet/VelocityLayoutServlet.html">org.apache.velocity.tools.view.servlet.VelocityLayoutServlet</a></p> |
| <h2 id="configuration-settings">Configuration Settings<a class="headerlink" href="#configuration-settings" title="Permanent link">¶</a></h2> |
| <p>Three settings can be added to velocity.properties to control the VLS, or the following default values will be used:</p> |
| <div class="codehilite"><pre><span class="c"># Filepath for error template,</span> |
| <span class="c"># relative to web application root directory</span> |
| <span class="na">tools.view.servlet.error.template</span> <span class="o">=</span> <span class="s">Error.vm</span> |
| |
| <span class="c"># Directory for layout templates,</span> |
| <span class="c"># relative to web application root directory</span> |
| <span class="na">tools.view.servlet.layout.directory</span> <span class="o">=</span> <span class="s">layout/</span> |
| |
| <span class="c"># Filepath of the default layout template</span> |
| <span class="c"># relative to the layout directory</span> |
| <span class="c"># NOT relative to the root directory of the webapp!</span> |
| <span class="na">tools.view.servlet.layout.default.template</span> <span class="o">=</span> <span class="s">Default.vm</sourcecode></pre></span> |
| </pre></div> |
| |
| |
| <h2 id="layouts">Layouts<a class="headerlink" href="#layouts" title="Permanent link">¶</a></h2> |
| <p>Now, in your layout templates, the only thing you really need is the screen content reference. So an acceptable layout template could be:</p> |
| <div class="codehilite"><pre><span class="p">$</span><span class="nv">screen_content</span><span class="x"></span> |
| </pre></div> |
| |
| |
| <p>...but that would make this whole thing an idiotic waste of time. At the least, you'll probably want to do something along these lines:</p> |
| <div class="codehilite"><pre><span class="p"><</span><span class="nt">html</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">title</span><span class="p">>$</span>!page_title<span class="p"></</span><span class="nt">title</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">body</span><span class="p">></span> |
| <span class="p">$</span><span class="nv">screen_content</span> |
| <span class="p"></</span><span class="nt">body</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">html</span><span class="p">></span> |
| </pre></div> |
| |
| |
| <p>This saves you the trouble of doing the basic <html>,<head>, and <body> tags in every single screen. That's the point of layouts: to save effort and eliminate redundancy. Note that this still lets the inner screen control the title of the page. This works because the layout template is blessed by the VLS with access to the same context as the screen <em>after</em> the screen is done with it. Just do a <code>#set( $page_title = "Hello" )</code> in the screen.</p> |
| <h2 id="alternative-layouts">Alternative Layouts<a class="headerlink" href="#alternative-layouts" title="Permanent link">¶</a></h2> |
| <p>VLS provides two ways to specify an alternate template for a requested page:</p> |
| <ol> |
| <li><strong>Specify the layout in the request parameters</strong></li> |
| </ol> |
| <p>Just add the query string "layout=MyOtherLayout.vm" to any request params and the VLS will find it and render your screen within that layout instead of the default layout. It don't matter how you get the layout param into the query data, only that it's there. If you're using the struts tools, the most common will likely be:</p> |
| <div class="codehilite"><pre><span class="p"><</span><span class="nt">a</span> <span class="na">href</span><span class="o">=</span><span class="s">"</span><span class="p">$</span><span class="nv">link</span><span class="p">.</span><span class="nv">setRelative</span><span class="p">(</span><span class="s1">'MyScreen.vm'</span><span class="p">).</span><span class="nv">addQueryData</span><span class="p">(</span><span class="s1">'layout'</span><span class="p">,</span><span class="s1">'MyOtherLayout.vm'</span><span class="p">)</span><span class="s">"</span><span class="p">></span> |
| </pre></div> |
| |
| |
| <p>but form post data will work just as well.</p> |
| <ol> |
| <li><strong>Specify the layout in the requested screen.</strong></li> |
| </ol> |
| <p>In the requested screen, put a line like this:</p> |
| <div class="codehilite"><pre><span class="cp">#</span><span class="nf">set</span><span class="p">(</span> <span class="p">$</span><span class="nv">layout</span> <span class="o">=</span> <span class="s2">"MyOtherLayout.vm"</span> <span class="p">)</span><span class="x"></span> |
| </pre></div> |
| |
| |
| <p>This will direct the VLS to use "MyOtherLayout.vm" instead of "Default.vm". <em>Setting the layout in this fashion will override any layout set by the request parameters.</em></p> |
| <h2 id="navigations-tiles-and-how">'Navigations', 'Tiles', and How<a class="headerlink" href="#navigations-tiles-and-how" title="Permanent link">¶</a></h2> |
| <p>Those of you who are (or were) Turbine or Struts users will probably want to do more than just set the layout and screen content. You want to include arbitrary "tiles" or "navigations", right? Well, thanks to Velocity's built-in <code>#parse</code> directive, this is easy.</p> |
| <p>First, create your "tile" as a separate template file like:</p> |
| <div class="codehilite"><pre><span class="p"><</span><span class="nt">div</span> <span class="na">id</span><span class="o">=</span><span class="s">"footer"</span><span class="p">></span>I made this!<span class="p"></</span><span class="nt">div</span><span class="p">></span> |
| </pre></div> |
| |
| |
| <p>For creativity's sake, we'll pretend this code is in a file named "Footer.vm" that is located in the root of my webapp like my other non-layout templates.</p> |
| <div class="codehilite"><pre><span class="p"><</span><span class="nt">html</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">title</span><span class="p">>$</span>!page_title<span class="p"></</span><span class="nt">title</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">body</span><span class="p">></span> |
| |
| <span class="p">$</span><span class="nv">screen_content</span> |
| |
| <span class="cp">#</span><span class="nf">parse</span><span class="p">(</span><span class="s1">'Footer.vm'</span><span class="p">)</span> |
| |
| <span class="p"></</span><span class="nt">body</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">html</span><span class="p">></span> |
| </pre></div> |
| |
| |
| <p>Easy, eh?</p> |
| <p>Now, what if you have a lot of different "footer" files and you want your screen to decide which one will be used? No problem! Do something like this:</p> |
| <div class="codehilite"><pre><span class="p"><</span><span class="nt">html</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">title</span><span class="p">>$</span>!page_title<span class="p"></</span><span class="nt">title</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">head</span><span class="p">></span> |
| <span class="p"><</span><span class="nt">body</span><span class="p">></span> |
| |
| <span class="p">$</span><span class="nv">screen_content</span> |
| |
| <span class="cp">#</span><span class="nf">parse</span><span class="p">(</span> <span class="p">$</span><span class="nv">screen_footer</span> <span class="p">)</span> |
| |
| <span class="p"></</span><span class="nt">body</span><span class="p">></span> |
| <span class="p"></</span><span class="nt">html</span><span class="p">></span> |
| </pre></div> |
| |
| |
| <p>and in your screen, just do <code>#set( $screen_footer = 'FooFooter.vm' )</code>.</p> |
| <p>Remember, your #parsed footer template will have access to the same velocity context as your layout, which gets the screen's context once the screen is done with it. This lets you set variables for the layout and footer to use from your screens.</p> |
| <h2 id="error-screen">Error Screen<a class="headerlink" href="#error-screen" title="Permanent link">¶</a></h2> |
| <p>Ok, the idea here is pretty simple. If an uncaught exception or error is thrown at some point during the processing of your screen and layout, the error() method of the VLS is called. This overrides the default error() method of the VelocityViewServlet to render a template instead of hardcoded html.</p> |
| <p>This error screen will be rendered within a layout under the same rules as any other screen, and will have the following values placed in its context to help you debug the error:</p> |
| <table class="table"> |
| <thead> |
| <tr> |
| <th>Key available to Template</th> |
| <th>Value</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>$error_cause</td> |
| <td>java.lang.Throwable that was thrown</td> |
| </tr> |
| <tr> |
| <td>$stack_trace</td> |
| <td>captured output of $error_cause.printStackTrace()</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>In the event that a MethodInvocationException is behind the calling of error(), the root cause is extracted from it and dealt with as described above. But, since template reference behavior is partly at fault here, the VLS will also add the MethodInvocationException itself to the context as $invocation_exception. This allows you to discover the reference and method call that triggered the root cause. To get those, do something like this in your error template:</p> |
| <div class="codehilite"><pre><span class="cp">#</span><span class="nf">if</span><span class="p">(</span> <span class="p">$</span><span class="nv">invocation_exception</span> <span class="p">)</span><span class="x"></span> |
| <span class="x"> oh joy! it's a MethodInvocationException!</span> |
| |
| <span class="x"> Message: </span><span class="p">$</span><span class="nv">invocation_exception</span><span class="p">.</span><span class="nv">message</span><span class="x"></span> |
| <span class="x"> Reference name: </span><span class="p">$</span><span class="nv">invocation_exception</span><span class="p">.</span><span class="nv">referenceName</span><span class="x"></span> |
| <span class="x"> Method name: </span><span class="p">$</span><span class="nv">invocation_exception</span><span class="p">.</span><span class="nv">methodName</span><span class="x"></span> |
| <span class="cp">#</span><span class="nf">end</span><span class="x"></span> |
| </pre></div></div></div> |
| <hr/> |
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