barcode generator github c# Summary Named templates are useful when you want to reuse code that doesn t use the current node. in Font

Creating PDF417 in Font Summary Named templates are useful when you want to reuse code that doesn t use the current node.

Summary Named templates are useful when you want to reuse code that doesn t use the current node.
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A template is given a name with the <xsl:template> element s name attribute.
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You can invoke named templates by calling them with <xsl:call-template>. The <xsl:call-template> instruction takes a name attribute that names the called template. Like <xsl:apply-templates>, <xsl:call-template> can contain <xsl:with-param> elements in order to pass in values for the parameters of the template that it calls.
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Tip The current node within a called template is the same as the current node at the point where the
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template is called. I think that it s bad practice to use the current node within a named template (for example, by using relative location paths), because you have no way of knowing what kind of node it might be. If the current node is important, I use a matching template (which might also be named).
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So in the template for the <Program> element, you need an <xsl:call-template> instruction calling the image template. The $flag parameter is assigned the value of the flag attribute of the <Program> element, as follows: <xsl:template match="Program" mode="Details"> ... <xsl:call-template name="image"> <xsl:with-param name="flag" select="@flag" as="xs:string" /> </xsl:call-template> ...
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CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
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Summary You can call a named template, with parameters if necessary, using the <xsl:call-template>
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Named templates are a lot like methods in object-oriented programming languages you call them by name, often passing arguments (parameters) to them, and they return a result. You can declare the type of the result of a template using the as attribute on <xsl:template>, which holds a sequence type, just like the as attribute on <xsl:variable>. Often this will be a sequence of nodes, but it could be an atomic value instead. For example, to declare that our image template returns a single <img> element, we can use <xsl:template name="image" as="element(img)"> <xsl:param name="flag" as="xs:string" required="yes" /> <img src="{if ($flag) then (if ($flag = 'favorite') then 'favorite' else 'interest') else 'spacer'}.gif" alt="[{if ($flag) then (if ($flag = 'favorite') then 'Favorite' else 'Interest') else ' '}]" width="20" height="20" /> </xsl:template>
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Note You can also declare the type of the result of a matching template using the as attribute. Summary You can declare the type of the result of invoking a template using the as attribute on
<xsl:template>.
Creating Links with a Named Template
There are several places within TVGuide.xsl where we need to create a link from a string to a URL. To make the user experience more enthralling, all the <a> elements generated by TVGuide2.xsl need to include attributes to change the style of links when you hover over the link with a mouse. To make it easy to add the attributes, we ll store them in a linkEvents attribute set, which needs to be included on each of the <a> elements that creates a link. The linkEvents attribute set is as follows: <xsl:attribute-set name="linkEvents"> <xsl:attribute name="style"> <xsl:text>color: black; border-bottom: 1pt groove #CCC</xsl:text> </xsl:attribute> <xsl:attribute name="onmouseover"> <xsl:text>javascript:this.style.background = '#CCC';</xsl:text> </xsl:attribute>
CHAPTER 11 NAMED TEMPLATES, STYLESHEET FUNCTIONS, AND RECURSION
<xsl:attribute name="onmouseout"> <xsl:text>javascript:this.style.background = 'transparent';</xsl:text> </xsl:attribute> </xsl:attribute-set> Most of the links are generated around the value of nodes, but on occasion the linked text and the URL being linked to can also be partial values or newly generated text. Each <a> element that s generated needs to have the linkEvents attribute set added to it using the xsl:use-attribute-sets attribute. The links are generated in several templates, for example: <xsl:template match="Channel" mode="ChannelList"> <a xsl:use-attribute-sets="linkEvents" href="#{Name}"> <xsl:value-of select="Name" /> </a> <xsl:if test="position() != last()"> | </xsl:if> </xsl:template> The result of transforming TVGuide.xml with TVGuide2.xsl, which contains this code, is TVGuide2.html, on which the links are underlined and where, when you hover over a link with the mouse, the link background turns gray. For example, in Figure 11-1 the mouse is hovering over the link to BBC2 at the top of the page.
Figure 11-1. Viewing TVGuide2.html in Internet Explorer
In TVGuide2.xsl, roughly the same code is used in multiple different templates to create the same kind of link. In fact, the only things that vary in each place are the URL to which the link is made and the content of the <a> element.
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