XForms has some predefined functions. But you can also call functions defined in scripts.
The XForms function library includes the entire XPath 1.0 core function library.
| Function |
Description |
| boolean-from-string(string) |
Returns true if the parameter string is "true" or "1"
and false if the parameter string is "false" or "0" |
| if(booleantest, string1, string2) |
Evaluates the Booleantest parameter and returns string1 if the test is
true, and string2 if the test is false |
| avg(node-set) |
Returns the average of all the nodes in the specified node-set. The
value of each node is converted to a number.
If the node-set is empty it returns NaN
<values>
<value>10</value>
<value>50</value>
<value>0</value>
</values>
avg(/values/value)
Returns: 20 |
| min(node-set) |
Returns the minimum value of all the nodes in the specified node-set.
The value of each node is converted to a
number. If the node-set is empty it returns NaN
<values>
<value>10</value>
<value>20</value>
<value>0</value>
</values>
min(/values/value)
Returns: 0 |
| max(node-set) |
Returns the maximum value of all the nodes in the specified node-set.
The value of each node is converted to a
number. If the node-set is empty it returns NaN
<values>
<value>10</value>
<value>20</value>
<value>0</value>
</values>
max(/values/value)
Returns: 20 |
| count-non-empty(node-set) |
Returns the number of non-empty nodes in
the specified node-set
<values>
<value>10</value>
<value>20</value>
<value>0</value>
<value />
</values>
count-non-empty(/values/value)
Returns: 3 |
| index(string) |
Returns the current index for a given repeat set |
| property(string) |
Returns the property named by the string parameter
- property("version") - returns the XForms version number
- property("conformance-level") - returns the XForms conformance level
("basic" or "full")
|
| now() |
Returns the current system date and time in xs:dateTime
format |
| instance(string) |
An XForms Model can contain more than one instance. This function
returns the root node of the specified instance data
<xforms:instance id="orderform">
<firstName>John</firstName>
</xforms:instance>
ref="instance('orderform')/firstName"
This example returns a node-set that consists of the firstName element node
from the instance named "orderform" |
| days-from-date(string) |
If the string parameter represents a legal xs:date or xs:dateTime, it returns the number of days between the specified date and
1970-01-01, otherwise it returns NaN
days-from-date("2002-01-02") returns 11689
days-from-date("1969-12-29") returns -3 |
| seconds-from-dateTime(string) |
If the string parameter represents a legal xs:dateTime, it returns the number of seconds between the specified dateTime and 1970-01-01T00:00:00Z,
otherwise it returns NaN |
| seconds(string) |
If the string parameter represents a legal xs:duration, it returns
the number specified in the seconds component plus 60 * the number specified
in the minutes component, plus 60 * 60 * the number specified in the hours
component, plus 60 * 60 * 24 * the number specified in the days component,
otherwise it returns NaN
seconds("P1Y2M") returns 0
seconds("P3DT10H30M1.5S") returns 297001.5
seconds("3") returns NaN
|
| months(string) |
If the string parameter represents a legal xs:duration, it returns
the number specified in the months component plus 12 * the number specified
in the years component, otherwise it returns NaN
months("P1Y2M") returns 14
months("-P19M") returns -19
|
