2

为了更多地了解 XSLT 的可能性，我想知道这是否是使用不同方法编写此条件代码的更好方法。

它只是在第一个实例中查找 href，如果存在 href 输入，则带有链接的关联图像将显示 + alt 标签输出。如果不存在 href 输入，则仅图像本身将显示 + alt 标签输出。

它适用于特定目的，尽管看起来和感觉有点笨重。

所以我想知道是否有更清洁或更智能的方式来实现结果。

任何建议将不胜感激。

谢谢，奥兹莫

Anyhoo，这是我的杰作……

      <!-- SUPPORTING IMAGE HREF CONDITIONAL -->
      <xsl:choose>
        <xsl:when test="SupportingImageLink/a/@href !=''">
          <tr>
            <td>
              <a href="{SupportingImageLink/a/@href}">
                <img src="{SupportingImage/img/@src}" width="680" alt="{SupportingImage/img/@alt}" style="border: 0;width: 100%;max-width: 680px;" class="center-on-narrow"></img>
              </a>
            </td>
          </tr>
        </xsl:when>
        <xsl:otherwise>
          <tr>
            <td>
                <img src="{SupportingImage/img/@src}" width="680" alt="{SupportingImage/img/@alt}" style="border: 0;width: 100%;max-width: 680px;" class="center-on-narrow"></img>
            </td>
          </tr>
        </xsl:otherwise>
      </xsl:choose>
      <!-- SUPPORTING IMAGE HREF CONDITIONAL : END -->

并按照这里的要求是精简的 XML ......

<root>
  <Title>New layout test</Title>
  <Edition>Octovember 2019</Edition>
  <Notification>
  <Body>Warning Warning Warning Will Robinson!! Aliens Aliens Aliens everywhere!</Body>
  </Notification>
  <Introduction>
    <Heading>Squids attack!</Heading>
    <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard. 90's unicorn next level fixie. Glossier coloring book drinking vinegar, health goth flexitarian activated charcoal yuccie hexagon whatever normcore bushwick ethical mustache plaid lyft. Chicharrones edison bulb vinyl disrupt tbh glossier, marfa mumblecore four loko +1 leggings.</Body>
  </Introduction>
  <Section>
    <Heading>Just in - Cyborg bears attacking!</Heading>
    <Structure>3</Structure>
    <SupportingImage>
      <img src="/uploadedImages/dev/robots.png?n=3082" alt="Will Robinson" title="Will Robinson" style="width: 680px; height: 283px;" align="left" width="680" height="283" />
    </SupportingImage>
    <SupportingImageLink>
      <a href="http://www.squids-attack/cyb-bears.html">AAARRRRGGGGHHHH!!!</a>
    </SupportingImageLink>
    <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard. 90's unicorn next level fixie. Glossier coloring book drinking vinegar, health goth flexitarian activated charcoal yuccie hexagon whatever normcore bushwick ethical mustache plaid lyft. Chicharrones edison bulb vinyl disrupt tbh glossier, marfa mumblecore four loko +1 leggings. Knausgaard af YOLO, direct trade drinking vinegar try-hard williamsburg roof party asymmetrical snackwave waistcoat. Venmo food truck next level raw denim, pabst photo booth quinoa chambray art party hot chicken cliche tote bag polaroid direct trade whatever. Shabby chic lomo locavore slow-carb leggings.</Body>
    <Button>More information</Button>
  </Section>
</root>
4

3 回答 3

1

我会把它写成一个模板：

<xsl:template match="/SupportingImageLink/img">
    <img src="@src" alt="@alt" width="680" .../>
</xsl:template>

和

<tr>
    <td>
         <xsl:apply-templates select="SupportingImageLink/node()"/>
    </td>
</tr>

E&OE

请注意，您的锚部分将通过默认复制规则自行发生。

于 2016-10-07T06:00:58.103 回答
0

完全可以在没有任何条件指令的情况下编写 XSLT 代码。

事实上，这是推荐的 DRY 练习！

  <xsl:template match="Section/SupportingImageLink">
    <tr>
      <td>
        <xsl:apply-templates select="a[@href !='']"/>
        <xsl:apply-templates select="self::*[not(a[@href !=''])]" mode="getImage"/>
      </td> 
    </tr>
  </xsl:template>

  <xsl:template match="SupportingImageLink/a[@href !='']/text()">
    <xsl:apply-templates select="." mode="getImage"/>
  </xsl:template>

  <xsl:template match="node()" mode="getImage">
    <xsl:param name="pImg" select="ancestor::Section[1]/SupportingImage/img"/>
     <img src="{$pImg/@src}" width="680" 
      alt="{$pImg/@alt}" style="border: 0;width: 100%;max-width: 680px;" 
      class="center-on-narrow"></img>
  </xsl:template>

这是在最基本的 XSLT 设计模式之上实现此的完整转换：使用和覆盖标识规则：

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
 <xsl:output omit-xml-declaration="yes" indent="yes"/>

  <xsl:template match="node()|@*">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*"/>
    </xsl:copy>
  </xsl:template>

  <xsl:template match="Section/SupportingImageLink">
    <tr>
      <td>
        <xsl:apply-templates select="a[@href !='']"/>
        <xsl:apply-templates select="self::*[not(a[@href !=''])]" mode="getImage"/>
      </td> 
    </tr>
  </xsl:template>

  <xsl:template match="SupportingImageLink/a[@href !='']/text()">
    <xsl:apply-templates select="." mode="getImage"/>
  </xsl:template>

  <xsl:template match="node()" mode="getImage">
    <xsl:param name="pImg" select="ancestor::Section[1]/SupportingImage/img"/>
     <img src="{$pImg/@src}" width="680" 
      alt="{$pImg/@alt}" style="border: 0;width: 100%;max-width: 680px;" 
      class="center-on-narrow"></img>
  </xsl:template>
</xsl:stylesheet>

当此转换应用于以下 XML 文档时（提供的文档带有一个SupportingImageLink没有与href属性链接的附加元素：

<root>
  <Title>New layout test</Title>
  <Edition>Octovember 2019</Edition>
  <Notification>
  <Body>Warning Warning Warning Will Robinson!! Aliens Aliens Aliens everywhere!</Body>
  </Notification>
  <Introduction>
    <Heading>Squids attack!</Heading>
    <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard. 
    90's unicorn next level fixie. Glossier coloring book drinking vinegar, 
    health goth flexitarian activated charcoal yuccie hexagon whatever 
    normcore bushwick ethical mustache plaid lyft. Chicharrones edison 
    bulb vinyl disrupt tbh glossier, marfa mumblecore four loko +1 leggings.</Body>
  </Introduction>
  <Section>
    <Heading>Just in - Cyborg bears attacking!</Heading>
    <Structure>3</Structure>
    <SupportingImage>
      <img src="/uploadedImages/dev/robots.png?n=3082" alt="Will Robinson" 
           title="Will Robinson" style="width: 680px; height: 283px;" 
           align="left" width="680" height="283" />
    </SupportingImage>
    <SupportingImageLink>
      <a href="http://www.squids-attack/cyb-bears.html">AAARRRRGGGGHHHH!!!</a>
    </SupportingImageLink>
    <SupportingImageLink>
      <a>AAARRRRGGGGHHHH!!!</a>
    </SupportingImageLink>
    <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard.
     90's unicorn next level fixie. Glossier coloring book drinking vinegar, 
     health goth flexitarian activated charcoal yuccie hexagon whatever normcore 
     bushwick ethical mustache plaid lyft. Chicharrones edison bulb vinyl 
     disrupt tbh glossier, marfa mumblecore four loko +1 leggings. Knausgaard
      af YOLO, direct trade drinking vinegar try-hard williamsburg roof party 
      asymmetrical snackwave waistcoat. Venmo food truck next level raw denim, 
      pabst photo booth quinoa chambray art party hot chicken cliche tote bag 
      polaroid direct trade whatever. Shabby chic lomo locavore slow-carb leggings.</Body>
    <Button>More information</Button>
  </Section>
</root>

如我们所见，产生了所需的正确输出：

<root>
  <Title>New layout test</Title>
  <Edition>Octovember 2019</Edition>
  <Notification>
      <Body>Warning Warning Warning Will Robinson!! Aliens Aliens Aliens everywhere!</Body>
  </Notification>
  <Introduction>
      <Heading>Squids attack!</Heading>
      <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard. 
    90's unicorn next level fixie. Glossier coloring book drinking vinegar, 
    health goth flexitarian activated charcoal yuccie hexagon whatever 
    normcore bushwick ethical mustache plaid lyft. Chicharrones edison 
    bulb vinyl disrupt tbh glossier, marfa mumblecore four loko +1 leggings.</Body>
  </Introduction>
  <Section>
      <Heading>Just in - Cyborg bears attacking!</Heading>
      <Structure>3</Structure>
      <SupportingImage>
         <img src="/uploadedImages/dev/robots.png?n=3082" alt="Will Robinson"
              title="Will Robinson"
              style="width: 680px; height: 283px;"
              align="left"
              width="680"
              height="283"/>
      </SupportingImage>
      <tr>
         <td>
            <a href="http://www.squids-attack/cyb-bears.html">
               <img src="/uploadedImages/dev/robots.png?n=3082" width="680" alt="Will Robinson"
                    style="border: 0;width: 100%;max-width: 680px;"
                    class="center-on-narrow"/>
            </a>
         </td>
      </tr>
      <tr>
         <td>
            <img src="/uploadedImages/dev/robots.png?n=3082" width="680" alt="Will Robinson"
                 style="border: 0;width: 100%;max-width: 680px;"
                 class="center-on-narrow"/>
         </td>
      </tr>
      <Body>Ugh tacos artisan, single-origin coffee jianbing hoodie skateboard.
     90's unicorn next level fixie. Glossier coloring book drinking vinegar, 
     health goth flexitarian activated charcoal yuccie hexagon whatever normcore 
     bushwick ethical mustache plaid lyft. Chicharrones edison bulb vinyl 
     disrupt tbh glossier, marfa mumblecore four loko +1 leggings. Knausgaard
      af YOLO, direct trade drinking vinegar try-hard williamsburg roof party 
      asymmetrical snackwave waistcoat. Venmo food truck next level raw denim, 
      pabst photo booth quinoa chambray art party hot chicken cliche tote bag 
      polaroid direct trade whatever. Shabby chic lomo locavore slow-carb leggings.</Body>
      <Button>More information</Button>
  </Section>
</root>
于 2016-10-09T19:21:13.623 回答
0

您的问题可能主要根据开发人员的意见得到回答。这对 SO 来说不是一件好事。如果我们谈论性能或可维护性，那么不会/不可能有那么多基于意见的东西。如果它执行得更快，它会更快！

从可爱的 Michael Kay 先生的 wrox 出版的《XSLT 2.0 and XPATH 2.0 4.th Edition》一书中了解到，您可以遵循以下设计模式：

填空样式表

HTML 的外观和感觉并没有使用 XSLT 的全部功能。<xsl:value-of ..该文档主要是 html，此外还有一些 xslt-tag 以通过例如您在该特定项目上的样式来获取动态内容。

导航样式表

除了填空之外，它还朝着“编程”的方向发展。在命名模板中外包待办事项，例如<xsl:template name="renderImage". 做更多的魔术，而不仅仅是输出一个元素的值。

基于规则的样式表

您的主要重点是将 xml 转换为输出目标。它可以从纯文本到 xml 对任何模式到 json 进行验证。您主要编写模板，例如<xsl:template match="img"和<xsl:template match="a"..。您创建由语句调用的规则集<xsl:apply-templates />。您宁愿说查找此节点的规则（-set）并查看那里定义了哪些规则，而不是像“现在调用这个命名模板，然后调用这个命名模板”那样命令 xslt 处理器。

计算样式表

让我们变得复杂并使用 XSLT 的全部功能并编写函数，将源树重新排序为目标树，创建节点并使用多个源文件和目标文件执行此操作。现在您必须了解函数式编程的概念并超越视野。

于 2016-10-07T07:40:24.120 回答