如何动态填写下拉菜单？

Question

I got some code (HTML and JavaScript) which creates a table with three columns and dynamic rows. I would like to have a drop-down-menu based on the entries of my first column. So the drop-down-menu should be filled after my table is completed. The first column can have multiple identical entries. So it is necessary to only show them once in my drop-down-menu. At the moment I only have a static drop-down-menu. See code below. The Program is working for static drop-down-menu very well.

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:fo="http://www.w3.org/1999/XSL/Format">
    <table id="myTable">
        <colgroup>
            <col width="150" style="background-color:red"></col>
            <col width="165"></col>
        </colgroup>
        <tr  style ="background-color:grey">
            <th>plane
                <select id="modelRangeDropdown" onchange="filterReports()">
                    <option selected="selected">All</option>
                    <option>number1</option>
                    <option>number2</option>                        
                </select>                   
            </th>   
            <th>Datum</th>
            <th>Secret</th>
        </tr>
        <xsl:for-each select="logstore/plane/trigger">
            <tr>
                <td><xsl:value-of select="../Name"/></td>
                <td><xsl:value-of select="date"/></td>
                <td><xsl:value-of select="secret"/></td>
            </tr>
        </xsl:for-each>
    </table>
    <script type="text/javascript" src="/../../../filterReports.js"></script>           
</body>
</html>
</xsl:template>
</xsl:stylesheet>

Answer 1

If you could use XSLT 2.0, you could use distinct-values and write the xsl:for-each like so

<select id="modelRangeDropdown" onchange="filterReports()">
    <option selected="selected">All</option>
    <xsl:for-each select="distinct-values(logstore/plane/Name)">
        <option value="{.}">
            <xsl:value-of select="." />
        </option>
    </xsl:for-each>
</select>  

On the other hand, if you are restricted to XSLT 1.0, you would need to make use of a technique called Muenchian Grouping . You would define a key like so:

<xsl:key name="planes" match="plane/Name" use="." />

Then, to get the distinct values, you would do this.....

<select id="modelRangeDropdown" onchange="filterReports()">
    <option selected="selected">All</option>
    <xsl:for-each select="logstore/plane/Name[generate-id() = generate-id(key('planes', .)[1])]">
        <option value="{.}">
            <xsl:value-of select="." />
        </option>
    </xsl:for-each>                    
</select>