RE: [xsl] Changing boolean value of xsl:attribute at runtime? Can it be done ....

[Brian Moynihan <BMoynihan at orygen dot com>]

Hi Joerg,

Thanks for the tips, we used the first one and it worked a treat .... one
small question about xsl:if statements thought,

when we use:

<xsl:if test="$allowedItem = 'true'"> 

the if statement fails even when allowedItem is equal to 'true', but if we
use:

<xsl:if test="$allowedItem != ''">

the if statement works. In our situation, the only value of allowedItem can
be either null or true.

If you have any ideas can you drop a mail .... thanks again.

-----Original Message-----
From: Joerg Heinicke [mailto:joerg.heinicke@gmx.de]
Sent: 05 April 2002 08:02
To: xsl-list@lists.mulberrytech.com
Subject: Re: [xsl] Changing boolean value of xsl:attribute at runtime?
Can it be done ....


Hello Brian,

you have the wrong approach. You are creating a div element with the
attribute value false. If one of the two conditions is fulfilled you replace
the attribute with its value true. But after this the attribute is "away",
it's only at the output tree, you can't access it again. So your code could
not work until now. The test on this attribute must always be false.

But why such a construct? Why not easily:

<xsl:if test="string(role) = '' or string(role) = $p_Authority">
        do anything
</xsl:if>

Another approach is using a variable instead of the attribute:

<xsl:template match="menu">
    <xsl:variable name="allowedItem">
        <xsl:choose>
            <xsl:when test="string(role) = '' or string(role) =
$p_Authority">true</xsl:when>
            <xsl:otherwise>false</xsl:otherwise>
        </xsl:choose>
    </xsl:variable>
    <xsl:if test="$allowedItem = 'true'">
        do anything
    </xsl:if>
</xsl:template>

Hope this helps,

Joerg


> Hi,
>
> I've been trying to get the following code to work but I keep on
> encountering problems - is there a better way of doing it?
>
> I have a Menu node which contains an allowedUserRole node. This sub-node
may
> have multiple authority/role attributes. I pass in an authority parameter
to
> the XSL and only want to continue processing the Node if the
authority/role
> attribute is blank, or if one of the authority/role attributes matches the
> parameter. I have created an attribute to store the true/false, but when I
> test the attribute's value in the XSL, it is blank - although the correct
> value is appearing in the generated HTML???
>
> Any help/suggestions would be greatly appreciated.
>
> The XML looks as follows:
>
> <menus>
> <menu id="eNew">
>  <description>Main Menu</description>
>  <allowedUserRole>
>   <authority />
>  </allowedUserRole>
>  <contents>
>   <menu id="e1">
>    <description>Customers</description>
>    <allowedUserRole>
>     <authority>
>       <role>user2</role>
>     </authority>
>     <authority>
>       <role>manager</role>
>     </authority>
>    </allowedUserRole>
>   </menu>
>  </contents>
> </menu>
> </menus>
>
>
> The XSL code is:
>
> <xsl:template match="menu">
>  <div onselectstart="return false" ondragstart="return false">
>  <xsl:attribute name="allowedItem">false</attribute>
>
>  <xsl:for-each select="./allowedUserRole">
>   <xsl:for-each select="./authority">
>    <xsl:choose>
>     <xsl:when test="string(role) = ''">
>      <xsl:attribute name="allowedItem">true</xsl:attribute>
>     </xsl:when>
>     <xsl:otherwise>
>      <xsl:if test="string(role) = $p_Authority">
>       <xsl:attribute name="allowedItem">true</xsl:variable>
>      </xsl:if>
>     </xsl:otherwise>
>    </xsl:choose>
>   </xsl:for-each>
>  </xsl:for-each>
>
>  <xsl:choose>
>  <xsl:when test="allowedItem = 'true'">
> .....continue processing node


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