Hi Fabien,
There is no class attribute defined for DocBook's imageobject element, so it is
unlikely that its value would be handled by the stylesheet. Were you thinking of the
role attribute? I see both class and role on imagedata, but since you are asking
about role="histogram", I'll assume you mean to use the role attribute.
Also, I'm not able to duplicate your results of getting the imageobject's
class="imgopen2" to appear on the div element. Are you using a stylesheet
customization that does that?
DocBook XSL has some limited support for propagating a role attribute to a class
attribute, but that is not a universal mechanism, simply because people use role for
many things and would not necessarily want to see its values appear in their HTML
output.
The stylesheets have a general mechanism for customizing a class attribute, but it
does not apply to <img>. That would require customizing a rather large template named
'process.image.attributes' to add a class attribute. But the class customization
mechanism does work for mediaobject, however. For example, if your source has a role
on mediaobject:
<mediaobject role="histogram">
when combined with the following stylesheet customization (remove the d: namespace if
using DocBook 4):
<xsl:template match="d:mediaobject" mode="class.value">
<xsl:choose>
<xsl:when test="@role">
<xsl:value-of select="@role"/>
</xsl:when>
<xsl:otherwise>mediaobject</xsl:otherwise>
</xsl:choose>
</xsl:template>
will result in this output:
<div class="histogram">
<table
<tbody>
<tr>
<td>
<img ...
and you can use a CSS selector such as:
div.histogram img {
}
to apply any CSS styles you need on the img element.
See this reference for more information on using mode="class.value":
http://www.sagehill.net/docbookxsl/UsingCSS.html#CustomClass
Bob Stayton
Sagehill Enterprises
[email protected]
----- Original Message -----
From: "Fabien Tillier" <[email protected]>
To: <[email protected]>
Sent: Monday, August 29, 2011 3:18 AM
Subject: [docbook-apps] image class or role in mediaobject
Hi List.
I want to add some tooling in the html output of my docbook for images,
and thus need to select only some of the ones I have displayed.
So, I have a class/role defined on the imagedata item
<mediaobject>
<imageobject class="imgopen2">
<imagedata class="histogram" role="histogram" align="center"
fileref="{$path}" width="18cm" format="PNG"/>
</imageobject>
...
</mediaobject>
However, when generating the html version, the class is not propagate,
thus
<div class="imgopen2">
<table summary="manufactured viewport for HTML img" border="0"
cellpadding="0" cellspacing="0" width="638">
<tbody><tr>
<td align="center">
<img src="myImage.png" alt="title"
align="middle" width="638"></td>
</tr>
</tbody></table>
</div>
Note, however that the class define on the imageobject is kept.
Is there a way I can have the "histogram" class propagated at the image
level ?
Thanks in advance
Best regards,
Fabien
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