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miercuri, 4 februarie 2015

Adding CSS and JS resources programmatically

In this post you can see how to programmatically load resource in a JSF page. Per example, the JSF page can look like this - notice that we don't load any resources via JSF tags:
...
<h:head>
 <title></title>
</h:head>
<h:body>
 <h:form>
  <h:commandButton value="Switch to Rafa Style" action="#{resBean.addResourcesAction()}"/>
 </h:form>
 <div id="wrapper" style="width:100%; text-align:center">
  <h:graphicImage library="default" name="img/rafa.png"/>
  <!-- <h:graphicImage value="#{resource['default:img/rafa.png']}"/> -->
 </div>
</h:body>
...

Now, when the button Switch to Rafa Style is pressed, a managed bean will supply a CSS file and a JS file, like this:

 public void addResourcesAction() {
  FacesContext facesContext = FacesContext.getCurrentInstance();
  UIOutput rafa_css = new UIOutput();
  UIOutput rafa_js = new UIOutput();

  rafa_css.setRendererType("javax.faces.resource.Stylesheet");
  rafa_css.getAttributes().put("library", "default");
  rafa_css.getAttributes().put("name", "css/rafa.css");
  rafa_js.setRendererType("javax.faces.resource.Script");
  rafa_js.getAttributes().put("library", "default");
  rafa_js.getAttributes().put("name", "js/rafa.js");

  facesContext.getViewRoot().addComponentResource(facesContext, rafa_css, "head");
  facesContext.getViewRoot().addComponentResource(facesContext, rafa_js, "head");
  }

GitHub Complete Code [AddResourcesProgrammatically]

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