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Web Component Guide

Reports

Reports are useful both for informative and archival purposes. You can use the Report

container to structure a group of views that you deem useful for dissemination to

interested parties or simply to keep as a historical record.

Reports in PDF format may be generated in color or in black and white (monochrome).

The Page Decoration component is used to define headers and footers in a report layout

if the intention is to convert the report to PDF format. If you use them to define a header

and a footer for a report, both header and footer elements must be placed before the

body pages. This design is required so that footers will appear in the case where the

body component is a table whose rows may span several pages.

It is possible to arrange for different headers and footers after the first page, and in

different sections of a large report. Simply add more Page Decoration components after

body views whenever new ones are required. You can emit a page break both before and

after any view, which gives added control over the layout, such as permitting you to

start a new section on a fresh page.

See the Web Component Reference pages on Report and Page Decoration for detailed

descriptions of these components, or refer to the Web Component Tutorial.

Report Layout

The Report component is designed to permit multi-page reports. It does this by checking

if there is enough space for the next view, and if there is not, generating a new page.

Reports also have special view types of header and footer, which are used to generate

running headers and footers on the pages of the reports. A footer must be specified

before the view on the first page it is to appear because it must be available when the

page is generated in order to allocate the correct amount of space for it. Headers and

footers can be changed later on in a report by re-specifying them among the body views

of the report.

Once the report determines where on a page to place a view, that view is drawn in the

report’s graphics, as opposed to the report generating a graphics for the view to use.

This means that reports which are nested in a parent report can also span multiple pages,

but it also means that the report is effectively transparent, and can not have a

background or border. Nested reports can not specify headers or footers—only the top-

level report is able to create them.

Note Container views that use a Fixed layout print in the sizes that are strictly specified by those

views and do not look substantially different than they do on the page. Most tables, either

printed directly as a report or embedded in a report, are able to flow to more than one page.

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