JSF WRITING CUSTOM RENDERER

The parts not shown are identical to the final version we looked at in Chapter The getMonths method uses the java. Command family can identify another renderer class that renders an HTML link element with JavaScript code for submitting the form the component belongs to and with the component’s value as the link text. The getConverter method of the InputDateRendererBase class returns the a converter, as shown in the following example:. Which is something I’ve actually implemented as a binary tag.

To support them for the date picker custom action, just add tag handler setter methods and code in the setProperties method for setting the values on the component, either as generic attributes or by casting the component reference to EditableValueHolder and calling the type-safe setter methods. The converter is responsible for transforming the object data back in to a string representation, so you need to implement getValueAsString method:. Nor is a View limited to only reference one backing bean. The setCurrentPage method is implemented like this:. Next, getPages creates a List with a Page instance per page and returns it. Consider this JSP page snippet:

Besides calling the encode methods of the component, a tag handler also creates the component it represents and adds it as a child of the component represented by its parent tag handler.

If the number of pages is less than the maximum number of links to render, getFirstPageIndex returns 0 so that links for all pages are rendered. The bar renderer we develop in this section is simpler, but it also need to control how the children are rendered. It is sorta covered in the JavaRanch Style Guide. JSF calls the decode method of each UIComponent instance with a rendered property set to true during the Apply Request Values phase, and a component configured with a renderer delegates the call to its renderer.

JSF – Creating a Custom Renderer as an output delegator of a Component

In cudtom following figure you can see decoding and encoding occur in the JSF lifecycle:. Facelets is a light weight templating framework. In other renderers, this method may instead get a Converter instance from the component by casting the component reference to ValueHolder and wriitng its getConverter method, or locate a Converter for the data type of the property the component is bound to, and use the Converter to convert the value as discussed in Chapter 7.

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jsf writing custom renderer

The bar renderer iterates through the model rows and renders its column children. The value attribute must be set to a value binding expression, because the model cusrom be expressed as a static value in a meaningful way.

Barbut you can use any name as long as it’s unique within the component family. A renderer is a pluggable class, and here’s how you register it: At any rate, I’ll try that again with composite, but to answer my question, if you know, is there any specific reason to use a Renderer like the Core JSF book is showing, or maybe that book is just showing how to do it, but that is more for cases where you will need different renderer’s?

Compared to the bar renderer from the previous section, the primary difference in this renderer denderer that it implements decoding and conversion behavior in addition to its encoding behavior. For the DataBarTagthis means the firstrowsvalueand var attributes. The only standard renderer for the UIData component i.

jsf writing custom renderer

The renderer type ID must be unique per component family. Templates are JSP-like markup pages with special tags that cutsom converted into Renderer by a build script. All standard JSF classes use component family names composed from the javax.

JSF – Creating a Custom Renderer as an output delegator of a Component

You could also define associated converter in this class. So I am trying to make sense of it all.

It sets the instance variable that holds the index for the first row in the reports table to the provided page number minus one and multiplied by the number of rows displayed per page, resulting in the index for the top row of the selected page. This algorithm ensures that the maximum number of links is always rendered and there’s always a link to the previous page, if any. All you need to do is ensure that these two methods return the desired type IDs.

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Hence, all children must be available already when the UIData encodeBegin method is called, and the tag handlers for the children must not invoke any encode methods on the children.

As the name implies, it tells the component which row in the model to start at for each page. It then calls the encodeBegin method.

I’ve got tons of apps that behave basically like what you’ve described, but I use a dataTable.

This is generally used when there are multiple tags to be rendered but for brevity or to reduce code repetition, only one tag is used i. The actual rendering is handled by the private encodeRecursive method, which we’ll look at in a bit.

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The Page class is an inner class that looks like this: Let’s pause for a moment and discuss why getRendersChildren method is needed. This is an interface that all input components implement, containing the methods related to the component’s editable value, such as the submittedValue property setter method.

jsf writing custom renderer

Make sure that the namespace and tag name is unique for the application. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Reports lists area with page navigation links Figure shows a new version of the reports list area from the sample application with a page links bar in addition to the first, previous, next, and last page button we used earlier.