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UI Customization

<p>
	The Microservice project contains a <c>files/htdocs</c> folder with predefined stylesheets and
	images.
</p>
<img style='width:200px' src='doc-files/juneau-microservice-jetty.UiCustomization.1.png'>
<p>
	These files can be used to tailor the look-and-feel of your microservice.
</p>
<p class='bpcode w800'>
	http://localhost:10000/helloWorld
</p>
<img class='bordered w800' src='doc-files/juneau-rest-server.UiCustomization.1.png'>
<p>
	The REST configuration section of your microservice configuration file can be used to tailor the header and footer on the pages:
</p>
<p class='bpcode w800'>
	<cc>#=======================================================================================================================
	# REST settings
	#=======================================================================================================================</cc>
	<cs>[REST]</cs>
	
	<ck>staticFiles</ck> = <cv>htdocs:files/htdocs</cv>
	
	<cc># Stylesheet to use for HTML views.</cc>
	<ck>theme</ck> = <cv>servlet:/htdocs/themes/devops.css</cv>
	
	<ck>headerIcon</ck> = <cv>servlet:/htdocs/images/juneau.png</cv>
	<ck>headerLink</ck> = <cv>http://juneau.apache.org</cv>
	<ck>footerIcon</ck> = <cv>servlet:/htdocs/images/asf.png</cv>
	<ck>footerLink</ck> = <cv>http://www.apache.org</cv>
	
	<ck>favicon</ck> = <cv>$C{REST/headerIcon}</cv>
	<ck>header</ck> = 
		<cv>&lt;a href='$U{$C{REST/headerLink}}'&gt;</cv>
			<cv>&lt;img src='$U{$C{REST/headerIcon}}' style='position:absolute;top:5;right:5;background-color:transparent;height:30px'/&gt;</cv>
		<cv>&lt;/a&gt;</cv>
	<ck>footer</ck> = 
		<cv>&lt;a href='$U{$C{REST/footerLink}}'&gt;</cv>
			<cv>&lt;img src='$U{$C{REST/footerIcon}}' style='float:right;padding-right:20px;height:32px'/&gt;</cv>
		<cv>&lt;/a&gt;</cv>
</p>
<p>
	The {@link oajr.BasicRestConfig} interface (which defines the default settings for {@link oajr.BasicRestServlet} 
	pulls in this information using {@link oaj.config.vars.ConfigVar $C} and {@link oajr.vars.UrlVar $U} variables:
</p>
<p class='bpcode w800'>
	<ja>@Rest</ja>(
		...
		<jc>// HTML-page specific settings</jc>
		htmldoc=<ja>@HtmlDoc</ja>(
	
			<jc>// Default page header contents.</jc>
			header={
				<js>"&lt;h1&gt;$R{resourceTitle}&lt;/h1&gt;"</js>,  <jc>// Use @Rest(title)</jc>
				<js>"&lt;h2&gt;$R{methodSummary,resourceDescription}&lt;/h2&gt;"</js>, <jc>// Use either @RestMethod(summary) or @Rest(description)</jc>
				<js>"$C{REST/header}"</js>  <jc>// Extra header HTML defined in external config file.</jc>
			},
	
			<jc>// Default stylesheet to use for the page.
			// Can be overridden from external config file.
			// Default is DevOps look-and-feel (aka Depression look-and-feel).</jc>
			stylesheet=<js>"$C{REST/theme,servlet:/htdocs/themes/devops.css}"</js>,
	
			<jc>// Default contents to add to the &lt;head&gt; section of the HTML page.
			// Use it to add a favicon link to the page.</jc>
			head={
				<js>"&lt;link rel='icon' href='$U{$C{REST/favicon}}'/&gt;"</js>
			},
	
			<jc>// No default page footer contents.
			// Can be overridden from external config file.</jc>
			footer=<js>"$C{REST/footer}"</js>
		),
	
		<jc>// Optional external configuration file.</jc>
		config=<js>"$S{juneau.configFile}"</js>,
	
		<jc>// These are static files that are served up by the servlet under the specified sub-paths.
		// For example, "/servletPath/htdocs/javadoc.css" resolves to the file "[servlet-package]/htdocs/javadoc.css"
		// By default, we define static files through the external configuration file.</jc>
		staticFiles=<js>"$C{REST/staticFiles}"</js>
	)
	<jk>public interface</jk> BasicRestConfig {}
</p>
<p>
	Note that the <c>files/htdocs</c> directory is mapped to <js>"servlet:/htdocs"</js> using the <c>staticFiles</c>
	setting.  This allows those files to be served up through the servlet through the URL <js>"/[servlet-path]/htdocs"</js>
</p>
<p>
	The theme files are externally accessible and can be modified to produce any look-and-feel you desire.
	The microservice still works without the files directory.  An embedded <c>devops.css</c> is included in the jar as a default spreadsheet.
</p>
<p>
	If you're testing out changes in the theme stylesheets, you may want to set the following system property that prevents caching of those files so 
	that you don't need to restart the microservice each time a change is made:
</p>
<p class='bpcode w800'>
	<cc>#=======================================================================================================================
	# System properties
	#-----------------------------------------------------------------------------------------------------------------------
	# These are arbitrary system properties that are set during startup.
	#=======================================================================================================================</cc>
	<cs>[SystemProperties]</cs>
	
	<cc># Disable classpath resource caching.
	# Useful if you're attached using a debugger and you're modifying classpath resources while running.</cc>
	<ck>RestContext.useClasspathResourceCaching.b</ck> = <cv>false</cv>

</p>