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<h1>XForms Functions</h1>
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<p class="intro">XForms has some predefined functions. But you can also call functions defined in scripts.</p>
<hr />
<h2>XForms Functions</h2>
<p>The XForms function library includes the entire XPath 1.0 core function library.</p>
<p>The XPath core functions can be found here:<a target="_blank" href="../xpath/xpath_functions.asp">
http://www.w3schools.com/xpath/xpath_functions.asp</a></p>
<p>The following table lists the additional functions within XForms:</p>
<table class="ex" cellspacing="0" border="1" width="100%">
<tr>
<th width="40%" align="left" valign="top">Function</th>
<th width="60%" align="left" valign="top">Description</th>
</tr>
<tr>
<td valign="top">boolean-from-string(string)</td>
<td>Returns true if the parameter string is "true" or "1"
and false if the parameter string is "false" or "0"</td>
</tr>
<tr>
<td valign="top">if(booleantest, string1, string2)</td>
<td>Evaluates the Booleantest parameter and returns string1 if the test is
true, and string2 if the test is false</td>
</tr>
<tr>
<td valign="top">avg(node-set)</td>
<td>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
<p><values><br />
<value>10</value><br />
<value>50</value><br />
<value>0</value><br />
</values></p>
<p>avg(/values/value)</p>
Returns: 20</td>
</tr>
<tr>
<td valign="top">min(node-set)</td>
<td>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
<p><values><br />
<value>10</value><br />
<value>20</value><br />
<value>0</value><br />
</values></p>
<p>min(/values/value)</p>
Returns: 0</td>
</tr>
<tr>
<td valign="top">max(node-set)</td>
<td>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
<p><values><br />
<value>10</value><br />
<value>20</value><br />
<value>0</value><br />
</values></p>
<p>max(/values/value)</p>
Returns: 20</td>
</tr>
<tr>
<td valign="top">count-non-empty(node-set)</td>
<td>Returns the number of non-empty nodes in
the specified node-set
<p><values><br />
<value>10</value><br />
<value>20</value><br />
<value>0</value><br />
<value /><br />
</values></p>
<p>count-non-empty(/values/value)</p>
Returns: 3</td>
</tr>
<tr>
<td valign="top">index(string)</td>
<td>Returns the current index for a given repeat set</td>
</tr>
<tr>
<td valign="top">property(string)</td>
<td>Returns the property named by the string parameter<ul>
<li>property("version") - returns the XForms version number</li>
<li>property("conformance-level") - returns the XForms conformance level
("basic" or "full")</li>
</ul>
</td>
</tr>
<tr>
<td valign="top">now()</td>
<td>Returns the current system date and time in xs:dateTime
format</td>
</tr>
<tr>
<td valign="top">instance(string)</td>
<td>An XForms Model can contain more than one instance. This function
returns the root node of the specified instance data
<p>
<xforms:instance id="orderform"><br />
<firstName>John</firstName><br />
</xforms:instance>
</p>
<p>ref="instance('orderform')/firstName"</p>
<p>This example returns a node-set that consists of the firstName element node
from the instance named "orderform"</p></td>
</tr>
<tr>
<td valign="top">days-from-date(string)</td>
<td>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
<p>days-from-date("2002-01-02") returns 11689<br />
days-from-date("1969-12-29") returns -3</p></td>
</tr>
<tr>
<td valign="top">seconds-from-dateTime(string)</td>
<td>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</td>
</tr>
<tr>
<td valign="top">seconds(string)</td>
<td>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
<p>
seconds("P1Y2M") returns 0<br />
seconds("P3DT10H30M1.5S") returns 297001.5<br />
seconds("3") returns NaN
</p>
</td>
</tr>
<tr>
<td valign="top">months(string)</td>
<td>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
<p>
months("P1Y2M") returns 14<br />
months("-P19M") returns -19
</p>
</td>
</tr>
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