XSLT Tutorial

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43.

La funzione boolean(). In questo stylesheet stringhe sono argomenti della funzione boolean(), che restituisce true se la lunghezza della striga è non zero. In questo stylesheet del testo viene trasformato in numeri e poi dato in pasto alla funzione boolean(). Questo stylesheet confronta "0" come stringa e come numero. Questo stylesheet usa node-sets come argomento.

XSLT stylesheet 1

XML Source

<source>

<text>124</text>
<text>AB234</text>
<text>-16</text>
<text>0</text>
<text/>
<text>false</text>

</source>

Output

<TABLE border="1">
  <TR>
     <TH>text</TH>
     <TH>boolean</TH>
  </TR>
  <TR>
     <TD>124</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>AB234</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>-16</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>0</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD/>
     <TD>false</TD>
  </TR>
  <TR>
     <TD>false</TD>
     <TD>true</TD>
  </TR>
</TABLE>

HTML view

text	boolean
124	true
AB234	true
-16	true
0	true
	false
false	true

XSLT stylesheet

<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <TABLE border="1">
          <TR>
               <TH>text</TH>
               <TH>boolean</TH>
          </TR>
          <xsl:for-each select="//text">
               <TR>
                    <TD>
                         <xsl:value-of select="."/>
                         <xsl:text/>
                    </TD>
                    <TD>
                         <xsl:value-of select="boolean(text())"/>
                    </TD>
               </TR>
          </xsl:for-each>
     </TABLE>
</xsl:template>

</xsl:stylesheet>

XSLT stylesheet 2

XML Source

<source>

<text>124</text>
<text>AB234</text>
<text>-16</text>
<text>0</text>
<text/>
<text>false</text>

</source>

Output

<TABLE border="1">
  <TR>
     <TH>text</TH>
     <TH>number</TH>
     <TH>boolean</TH>
  </TR>
  <TR>
     <TD>124</TD>
     <TD>124</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>AB234</TD>
     <TD>NaN</TD>
     <TD>false</TD>
  </TR>
  <TR>
     <TD>-16</TD>
     <TD>-16</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>0</TD>
     <TD>0</TD>
     <TD>false</TD>
  </TR>
  <TR>
     <TD/>
     <TD>NaN</TD>
     <TD>false</TD>
  </TR>
  <TR>
     <TD>false</TD>
     <TD>NaN</TD>
     <TD>false</TD>
  </TR>
</TABLE>

HTML view

text	number	boolean
124	124	true
AB234	NaN	false
-16	-16	true
0	0	false
	NaN	false
false	NaN	false

XSLT stylesheet

<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <TABLE border="1">
          <TR>
               <TH>text</TH>
               <TH>number</TH>
               <TH>boolean</TH>
          </TR>
          <xsl:for-each select="//text">
               <TR>
                    <TD>
                         <xsl:value-of select="."/>
                         <xsl:text/>
                    </TD>
                    <TD>
                         <xsl:value-of select="number(text())"/>
                         <xsl:text/>
                    </TD>
                    <TD>
                         <xsl:value-of select="boolean(number(text()))"/>
                    </TD>
               </TR>
          </xsl:for-each>
     </TABLE>
</xsl:template>

</xsl:stylesheet>

XSLT stylesheet 3

XML Source

<source>

<text>124</text>
<text>AB234</text>
<text>-16</text>
<text>0</text>
<text/>
<text>false</text>

</source>

Output

<P>The boolean value of "0" is <B>true</B> if "0" is a string, but <B>false</B> if "0" is a number.</P>

HTML view

The boolean value of "0" is true if "0" is a string, but false if "0" is a number.

XSLT stylesheet

<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <P>
          <xsl:text>The boolean value of "0" is </xsl:text>
          <B>
               <xsl:value-of select="boolean(//text[text()='0'])"/>
          </B>
          <xsl:text> if "0" is a string, but </xsl:text>
          <B>
               <xsl:value-of select="boolean(number((//text[text()='0'])))"/>
          </B>
          <xsl:text> if "0" is a number.</xsl:text>
     </P>
</xsl:template>

</xsl:stylesheet>

XSLT stylesheet 4

XML Source

<source>

<text>124</text>
<text>AB234</text>
<text>-16</text>
<text>0</text>
<text/>
<text>false</text>

</source>

Output

<TABLE border="1">
  <TR>
     <TH>node-set</TH>
     <TH>boolean</TH>
  </TR>
  <TR>
     <TD>/</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>//text</TD>
     <TD>true</TD>
  </TR>
  <TR>
     <TD>//number</TD>
     <TD>false</TD>
  </TR>
  <TR>
     <TD>//text[23]</TD>
     <TD>false</TD>
  </TR>
</TABLE>

HTML view

node-set	boolean
/	true
//text	true
//number	false
//text[23]	false

XSLT stylesheet

<xsl:stylesheet version = '1.0'
     xmlns:xsl='http://www.w3.org/1999/XSL/Transform'>

<xsl:template match="/">
     <TABLE border="1">
          <TR>
               <TH>node-set</TH>
               <TH>boolean</TH>
          </TR>
          <TR>
               <TD>
                    <xsl:text>/</xsl:text>
               </TD>
               <TD>
                    <xsl:value-of select="boolean(/)"/>
               </TD>
          </TR>
          <TR>
               <TD>
                    <xsl:text>//text</xsl:text>
               </TD>
               <TD>
                    <xsl:value-of select="boolean(//text)"/>
               </TD>
          </TR>
          <TR>
               <TD>
                    <xsl:text>//number</xsl:text>
               </TD>
               <TD>
                    <xsl:value-of select="boolean(//number)"/>
               </TD>
          </TR>
          <TR>
               <TD>
                    <xsl:text>//text[23]</xsl:text>
               </TD>
               <TD>
                    <xsl:value-of select="boolean(//text[23])"/>
               </TD>
          </TR>
     </TABLE>
</xsl:template>

</xsl:stylesheet>