I need to add programmatically JavaScript and CSS resources to <h:head> of a JSF page. It isn't clear how to achieve this. How can I do it or is there a kickoff example?
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2 Answers
That depends on where exactly you'd like to declare the resource. Normally, the only reason to programmatically declare them is that you've a custom UIComponent or Renderer which generates HTML code which in turn requires those JS and/or CSS resources. They are then to be declared by @ResourceDependency or @ResourceDependencies.
@ResourceDependency(library="mylibrary", name="foo.css")
public class FooComponentWithCSS extends UIComponentBase {
// ...
}
@ResourceDependencies({
@ResourceDependency(library="mylibrary", name="bar.css"),
@ResourceDependency(library="mylibrary", name="bar.js")
})
public class BarComponentWithCSSandJS extends UIComponentBase {
// ...
}
But if you really need to declare them elsewhere, such as in a backing bean method which is invoked before render response (otherwise it's simply too late), then you can do that by UIViewRoot#addComponentResource(). The component resource must be created as an UIOutput having a renderer type of javax.faces.resource.Script or javax.faces.resource.Stylesheet, to represent a fullworthy <h:outputScript> or <h:outputStylesheet> respectively. The library and name attributes can just be put in the attribute map.
UIOutput css = new UIOutput();
css.setRendererType("javax.faces.resource.Stylesheet");
css.getAttributes().put("library", "mylibrary");
css.getAttributes().put("name", "bar.css");
UIOutput js = new UIOutput();
js.setRendererType("javax.faces.resource.Script");
js.getAttributes().put("library", "mylibrary");
js.getAttributes().put("name", "bar.js");
FacesContext context = FacesContext.getCurrentInstance();
context.getViewRoot().addComponentResource(context, css, "head");
context.getViewRoot().addComponentResource(context, js, "head");
4 Comments
Thor
Here you find information where to place the declaration: stackoverflow.com/questions/3586629
Dmitry Trifonov
Great! This saved my day.
Jasper de Vries
I was also struggling with where to add the declaration. I ended up adding it in the constructor of my UIComponent.
BalusC
@JasperdeVries: Any method which is invoked before render response suffices. Inside an
UIComponent you'd usually hook on PostAddToViewEvent or perhaps PreRenderViewEvent for that.You can add a script and style resources to a page like this:
var head = document.getElementsByTagName("head")[0];
var s = document.createElement("script");
s.type = "text/javascript";
s.src = "xxxx.js";
head.appendChild(s);
s = document.createElement("style");
s.type = "text/css"
s.src = "yyy.css";
head.appendChild(s);
Or, in function form:
function addScript(path) {
var head = document.getElementsByTagName("head")[0];
var s = document.createElement("script");
s.type = "text/javascript";
s.src = path;
head.appendChild(s);
}
function addCSSFile(path) {
var head = document.getElementsByTagName("head")[0];
var s = document.createElement("style");
s.type = "text/css";
s.src = path;
head.appendChild(s);
}
1 Comment
Jasper de Vries
Although this is valid when used in JavaScript, this does not help in a JSF context.