JSF WRITING CUSTOM RENDERER

I am sure this must have something to do with the cc. For the DataBarTag , this means the first , rows , value , and var attributes. The getFirstPageIndex method first figures out how many pages there are by checking the size of the List returned by the getPages method. We’ll look at how the select method is used shortly. The BarRenderer class declaration and the first public method look like this:. Renderer class and overrides the inherited implementation of the getRendersChildren method to return true instead of false.

The isDisabledOrReadOnly method returns true if one or both of these attributes are enabled: To add support for render-dependent attributes like this, add a setter method in the tag handler class and code for setting the attributes as generic attributes in the setProperties method, plus the same kind of code that the DatePickerRenderer uses to render the styleClass attribute value for all the additional attributes. DatePicker , following the same convention as for the bar custom renderer. It’s easier than it sounds, because a base class called javax. Well, OK, at least it’s less likely to drive them insane.

It sets the instance variable that holds the index for cystom 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. It is sorta covered in the JavaRanch Style Guide. The parts not shown are identical to the final version we looked at in Chapter Actually, you are doing it very much the hard way.

Write custom renderers – Prime Community Forum

For the DatePickerRendererthis method extracts the year, month, and day values from the Map passed as the submitted value and converts them into a Date instance that it returns. Tag files Tag files cutom a way to define custom tag. The first property holds the index of the first row to render and the rows property holds the number of rows to render.

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It’s easier than it sounds, because a xustom class called javax.

The bar renderer iterates through the model rows and renders its column children. The attribute is bound to a property named noOfPageLinksimplemented like this in the ReportHandler class: Even though it’s extra work and you might NEVER need it, at least your tag wouldn’t drive someone else crazy trying to make sense of it if it at least follows the documented design standards.

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jsf writing custom renderer

The BarRenderer class declaration and the first public method look like this:. Otherwise the getConvertedValue method throws a ConverterException.

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Date selection lists rendered by a custom renderer for an input component Because wriying date value is rendered as three selection lists, it’s sent to the server as three separate parameters.

To add support for render-dependent attributes like this, add a setter method in the tag handler class and code for setting the attributes as generic attributes in the setProperties method, plus the same kind of code that the DatePickerRenderer uses to render the styleClass attribute value for all the additional attributes.

As before, we must register the date-picker renderer in the cusfom. Subclasses of this class are attached to components writnig are responsible for rendering or encodingas it’s called in the specification the component and, if it’s an input component, for decoding the submitted value to the component’s internal representation.

JSF : JSF Custom Components: Tag Files, Composite Components & Custom Components

The rest of the setProperties method configures the component based on the attributes that are unique for this custom action. In order to use a Cuetom component with the custom renderer in a JSP page, you must develop a Rendereg tag handler that creates and configures an instance of the component and tells it to use the BarRenderer class for rendering.

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This one is a bit more complex because it must ensure that the rendered page links are synchronized with the reports rendered in the reports table. Barbut you can use rebderer name as long as it’s unique within the component family. Let’s create the template for HTML 4. The setCurrentPage method is implemented like this: If you are going to implement custom components, always try to use the Facelets XML component architecture.

The getComponentType method returns javax. The var attribute value is therefore always set as a static component property value. The getFirstPageIndex method first figures out how many pages there are by checking the size of the List returned by the getPages method.

Two UIData properties controls which rows to render. The default ResponseWriter doesn’t do anything fustom this information, but you should still provide it to help tools that do.

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

Anonymous April 8, at The component saves the returned value as its local value and resets the submitted value. The converter is responsible for transforming the object data back in to a string representation, so you need to implement getValueAsString method:.

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jsf writing custom renderer

I add the declaration to the same taglib. The encodeChildren method loops over the rows from the UIData component’s csutom using these property values as the initial loop variable value and in the loop end condition, respectively.