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PD4ML: Conditional PDF page breaks. Widows and Orphans
PD4ML introduces a proprietary page break tag: <pd4ml:page.break> (and
its synonym <pd4ml-page-break> for strict contexts).Without parameters
it just forces a pagebreak. But its ifSpaceBelowLessThan attribute allows us to keep some content portions on the same page.
Let's say we have an image and a caption, belongs to it:
Chart #4.2<br>
<img src="images/chart42.png" width="400" height="300">
If we want to be 100% sure the caption and the image are on the same page,
we could put a page break tag before the caption definition. But that can result an inefficient previous page space usage or
can even result
a blank page.If we place a conditional page break tag:
<pd4ml:page.break ifSpaceBelowLessThan="330">
Chart #4.2<br>
<img src="images/chart42.png" width="400" height="300">
it will break only if the remaining space on the current page is less than 330px
(and the image 300px high and the caption - let's say 30px - do not fit the
space).
Another option to achieve similar functionality is to use CSS page break
control:
<table style="page-break-inside: avoid">
<tr><td>
Chart #4.2<br>
<img src="images/chart42.png" width="400" height="300">
</td></tr>
</table>
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