如何汇总 XSL-FO 表格中每页的一些值？
我正在使用 XSL-FO 生成帐户报表打印输出。 PDF 实际上只是一个简单的表格，每页上都有一个简单的页眉。困难在于我必须显示每页的交易量，例如
第 1 页
+------------------------------+-----------+-----------+---------------------+
| Text | Credit | Debit | Balance |
+------------------------------+-----------+-----------+---------------------+
| Previous month | | | (*1) 1000 |
| abc | 1000 | | 2000 |
| abc | | 500 | 1500 |
| abc | | 200 | 1300 |
| ... | | | |
| Carry over | (*2) 1000 | (*3) 700 | (*4) 1300 |
+------------------------------+-----------+-----------+---------------------+
第 2 页
+------------------------------+-----------+-----------+---------------------+
| Text | Credit | Debit | Balance |
+------------------------------+-----------+-----------+---------------------+
| Previous page | (*2) 1000 | (*3) 700 | (*4) 1300 |
| abc | 1000 | | 2300 |
| abc | | 500 | 1800 |
| abc | | 200 | 1600 |
| ... | | | |
| Carry over | (*2) 2000 | (*3) 1400 | (*4) 1600 |
+------------------------------+-----------+-----------+---------------------+
这里有一些解释：
- 这是上个月的余额。它是预先计算的并且被称为 XSL 变量。没问题，这是一个常规标题（仅在第一页上）
- 该值是按页计算的。它汇总了同一页面上的所有信用金额。我自己无法计算，因为我不知道 XSL-FO 何时会进行分页。所以我想 XSL-FO 必须为我进行计算。页面底部的总和与下一页顶部的值相同。
- 该值与 2 相同，仅适用于借方金额。
- 该值只是页面底部最后一笔交易的余额。该值将在下一页的顶部重复。
如何使用 XSL-FO 进行这些计算？
另请参阅此相关问题：如何根据XSL-FO中的页码显示一项或多项信息？
I'm using XSL-FO to generate an account statement print out. The PDF is actually just a simple table with a simple header on every page. The difficulty is that I have to display transaction volumes per page, e.g.
Page 1
+------------------------------+-----------+-----------+---------------------+
| Text | Credit | Debit | Balance |
+------------------------------+-----------+-----------+---------------------+
| Previous month | | | (*1) 1000 |
| abc | 1000 | | 2000 |
| abc | | 500 | 1500 |
| abc | | 200 | 1300 |
| ... | | | |
| Carry over | (*2) 1000 | (*3) 700 | (*4) 1300 |
+------------------------------+-----------+-----------+---------------------+
Page 2
+------------------------------+-----------+-----------+---------------------+
| Text | Credit | Debit | Balance |
+------------------------------+-----------+-----------+---------------------+
| Previous page | (*2) 1000 | (*3) 700 | (*4) 1300 |
| abc | 1000 | | 2300 |
| abc | | 500 | 1800 |
| abc | | 200 | 1600 |
| ... | | | |
| Carry over | (*2) 2000 | (*3) 1400 | (*4) 1600 |
+------------------------------+-----------+-----------+---------------------+
Here are some explanations:
- This is the previous month's balance. It's pre-calculated and well-known as an XSL variable. No problem with that, that's a regular header (only on the first page)
- This value is calculated on a per-page basis. It sums up all credit amounts on the same page. I can't calculate that myself, as I don't know when XSL-FO will do the page break. So I imagine XSL-FO must do the calculation for me. The sum at the bottom of a page is the same as the value at the top of the subsequent page.
- This value is the same as 2, only for debit amounts.
- This value is just the last transaction's balance at the bottom of a page. That value is repeated at the top of the next page.
How can I do these calculations with XSL-FO?
See also this related question: How to display one or the other information depending on the page number in XSL-FO?
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尝试“表格标记”： http://www.w3.org/TR/ xsl/#fo_retrieve-table-marker。
在 XSLT 中，为每一行注入一个带有总和的标记。然后让引擎选择一个标记来替换表头或表尾中的 fo:retrieve-table-marker。这个想法是，在渲染时将根据标记在页面上的位置以及 fo:retrieve-table-marker 上的 @retrieve-position 和 @retrieve-boundary 选择适当的标记。
Try "table markers": http://www.w3.org/TR/xsl/#fo_retrieve-table-marker.
In XSLT for each row inject a marker with the sum. Then let the engine select a marker to substitute for the fo:retrieve-table-marker in table header or footer. The idea is that proper marker will be selected at rendering time depending on the marker's position on the page and @retrieve-position and @retrieve-boundary on the fo:retrieve-table-marker.
不幸的是，（在我回答这个问题时，它不再正确）fop没有实现
< ;fo:retrieve-table-marker/>根据我的发现。相反，这里的解决方案对我有用：如何根据 XSL-FO 中的页码显示一个或另一个信息？
它涉及在 XSL-FO 之外创建一个单独的表
Unfortunately, (at the time when I answered this question, it's no longer true) fop doesn't implement
<fo:retrieve-table-marker/>from what I have found out. Instead, this solution here worked for me:How to display one or the other information depending on the page number in XSL-FO?
It involves creating a separate table outside of the
<fo:flow/>that displays the table header using<fo:retrieve-marker/>elements.