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    May 26, 2006

Dynamic Sorting or Sort by Parameter

Guest Author

When you create a simple report that contains for example a
single table, many users would like to have a single template that gets
the column by which the table is sorted as a parameter - so that the end user
can easily change it. Lately, I got this functionality working  and thought I share
it.First you will need to define a parameter:

<xsl:param name="order"

select="'SALARY'" xdofo:ctx="begin"/>

Next you will create a table that is sorted for example by name
This can be accomplished easily with the table wizard. The resulting for-each

and sort statements are:


So in a first attempt we would replace NAME with $order to

use the parameter to sort:


This does not work because $order contains a string,
while the <?sort:$order ?> statement which is translated into a
<xsl:sort select="$order"/> expect a node as a parameter and not a name.
So how do we get the SALARY node from a variable that contains the text

We can get the node by adding a predicate using the []

syntax. We first use the expression that matches any childnode: ./*. Now we add

the condition that the name of the child node equals the content of the

variable $order. The resulting expression is:

./*[name(.) = $order].

So we replace the NAME not with $order but with ./*[name(.)= $order] and achieve

<?sort:./*[name(.) = $order];'ascending';data-type='text'?>

This worked fine, with one caveat: It always sorts alphanumerical and not numerical - meaning 1000 comes before 2. You will

need to change the data-type to achieve correct sorting. You could achieve that with an if statement to set the data-type depending on the field name and run into some other issues or pass the type as a parameter.

If you want to use a parameter (e.g. with the name type) in for the data-type, you need to know that this field expects a string and not a node. If you write:

<?sort:./*[name(.) = $order];'ascending';data-type='$type'?>

your sorting will fail, because it will use the name of the variable $type as the data type and not its content. So you will need to user {} around the variable to substitute an XPATH expression or a variable inside the text. The final expression is:

<?sort:./*[name(.) = $order];'ascending';data-type='{$type}'?>

and your dynamic sorting should work like a charm. Unless you want to use an if statement to set the data-type depending on the parameter name - but that is a different story to be told at a different time.

Klaus Fabian

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Comments ( 4 )
  • Nikki Wednesday, December 3, 2008
    i have been trying to do a sort similiar to this and it doesn't work when there is no data in the field.

    if i put a value in the sort, then it works correctly.

    any ideas?
  • Ritu Saturday, February 21, 2009
    Hey...great tip.
    I tried it and it works.
    However, I need this scenario: I have a table in a report and depending on some parameter, I need to change the sort criteria. I have the following code:

    When, CP_ORDER_BY='Hold Name', this works great. In the 2nd case, it doesnt sort.
    Also note, when I replace the sort statement with

    it again works fine.
    I think it is some problem with the way I am assigning values to 'order' and 'type'.
    This is urgent. Please advise.
  • tshirt Wednesday, August 18, 2010
    Interesting reading
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