UMI.CMS - adding option selector to xsl template - blank page?

Question

XSL & XSLT

Good afternoon, a question about UMI.CMS.
Tell me, please, when adding the output of the add. options in the product template, just a white page appears. I add a code to object-view.xsl that is responsible for displaying additional product parameters such as size, color, quantity, an empty page comes out, the parameter code itself is from the popup-add-options.xsl file.
The main task is to display a list of product parameters not in a drop-down window when you click on the Add to Cart button, but on the very page of a detailed product description with a photo. Where after choosing, for example, the size, the buyer adds the product to the cart.
I work with UMI for the first time, I study the documentation, but there were difficulties with this issue. The point is that the add. the parameters are displayed in a modal window, I try to insert the code into the template and this is where it all starts :). I put approximate type options - it works without errors, I take the code to display optional parameters:

<xsl:template match="/">
    <form class="options" action="/emarket/basket/put/element/{udata/page/@id}/">
      <xsl:apply-templates select="//group[@name = 'catalog_option_props']/property" />
      <input type="submit" class="button" value="Добавить"/>
    </form>
  </xsl:template>

  <xsl:template match="property">
    <table>
      <thead>
        <tr>
          <th colspan="3" align="left">
            <xsl:value-of select="concat(title, ':')" />
          </th>
        </tr>
      </thead>
      <tbody>
        <xsl:apply-templates select="value/option" />
      </tbody>
    </table>
  </xsl:template>

  <xsl:template match="option">
    <tr class="param_{object/@id}">
      <td style="width:20px;">
        <input type="radio" name="options[{../../@name}]" value="{object/@id}" id="{generate-id()}">
          <xsl:if test="position() = 1">
            <xsl:attribute name="checked">
              <xsl:text>checked</xsl:text>
            </xsl:attribute>
          </xsl:if>
        </input>
      </td>
      <td>
        <label for="{generate-id()}">
          <xsl:value-of select="object/@name" />
        </label>
      </td>
      <td align="right">
        <label for="{generate-id()}">
          <p class="price"><span class="sum"><xsl:value-of select="@float" /> </span><span class="suffix">p</span></p>

          <div class="add_amount">
            <img class="minus" src="/templates/public/images/minus_amount.png"/>
            <input id="amount_{@id}" class="amount" type="text" name="amount" value="1" maxlength="3"/>
            <img class="plus" src="/templates/public/images/plus_amoun.png" />
          </div>
        </label>
      </td>
    </tr>
  </xsl:template>

Thanks a lot for the tips!

Answer 1

The reason for a blank page when working with an XSLT templating engine may indicate that there is an error in the template. Enable error display mode (config.ini):

[debug]
enabled = "1"
show-backtrace = "1"

Instead of a blank page, messages like this will be displayed:
From this message, it will be clear to the rhinestone where the problem is. The debug.xsl
template might also be useful :

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <!-- debug tools -->
  <xsl:template match="*" mode="debug">
    <textarea>
      <xsl:copy-of select="*"/>
    </textarea>
  </xsl:template>

</xsl:stylesheet>

It must be included in your templates <xsl:include href="debug.xsl"/>and used in any xsl:apply-templatesadding mode="debug", for example, like this:

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

  <xsl:template match="property">
    <xsl:apply-templates select="value/option" mode="debug" />
  </xsl:template>

</xsl:stylesheet>

As a result, the content of the XML tree for which the template is applied will be visible, this can be useful for correctly building the XPath used by select or match templates.