| |
| In web applications, it's quite common to have one or more root context folders containing css/js files. These resources are normally referenced with an absolute path inside link/script tags: |
| |
| [source,html] |
| ---- |
| <script src="/misc/js/jscript.js"></script> |
| <link type="text/css" rel="stylesheet" href="/misc/css/themes/style.css" /> |
| ---- |
| |
| To handle this kind of resources from code we can use resource reference class _org.apache.wicket.request.resource.ContextRelativeResourceReference_. To build a new instance of this class we must specify the root context path of the resource we want to use: |
| |
| [source,java] |
| ---- |
| ContextRelativeResourceReference resource = new ContextRelativeResourceReference("/misc/js/jscript.js"); |
| ---- |
| |
| By default when our application runs in DEPLOYMENT mode _ContextRelativeResourceReference_ will automatically load the minified version of the specified resource using 'min' as postfix. In the example above it will load '/misc/js/jscript.min.js'. We can force _ContextRelativeResourceReference_ to always use the not-minified resource passing an additional flag to class constructor: |
| |
| [source,java] |
| ---- |
| //it will always use '/misc/js/jscript.js' |
| ContextRelativeResourceReference resource = new ContextRelativeResourceReference("/misc/js/jscript.js", false); |
| ---- |
| |
| The minified postfix can be customized with an optional string parameter: |
| |
| [source,java] |
| ---- |
| //it will use '/misc/js/jscript.minified.js' in DEPLOYMENT mode |
| ContextRelativeResourceReference resource = new ContextRelativeResourceReference("/misc/js/jscript.js", "minified"); |
| ---- |
| |
| _ContextRelativeResourceReference_ is usually used with the header item classes we have seen before in this chapter to create entries for the page header section. |
| |
| === Picture files |
| |
| For picture files Wicket provides a specific component with class _org.apache.wicket.markup.html.image.ContextImage_ which is meant to be used with tag <img> |
| |
| [source,java] |
| ---- |
| //build the component specifying its id and picture's context path |
| ContextImage image = new ContextImage("myPicture", "/misc/imgs/mypic.png"); |
| ---- |
| |
