Filtering based on dropdown in DVWP - sharepoint

Question

I have created a DVWP dropdown for filtering a list which I've shown using a DVWP. I've set an year list as the dropdown DVWP data source and on selecting a year, i wanna filter the list DVWP to show the items filtered by year.
The dropdown:
<select name="ID" size="1"
onchange="document.location.href='http://server/site.aspx' + '?' + 'year' + '=' + this.options[selectedIndex].value">.
I've added a QueryString parameter param1 which takes its value from Year to this dropdown as well as the list DVWP. In the list DVWP, I've added a filter condition which is: Year equals [Param1]. Note: Year here is a calculated column which gets year from a date field.
My question is even though the dropdown gets post back after selecting a value, it doesn't get filtered. What have I done wrong in this? I've been racking my brains on this but I can't get this to work no matter what I try. Please help.
<xsl:template name="dvt_1">
<xsl:variable name="dvt_StyleName">Table</xsl:variable>
<xsl:variable name="Rows" select="/dsQueryResponse/Rows/Row"/>
<xsl:variable name="dvt_FieldNameNoAtSign" select="substring-after($dvt_filterfield, '#')" />
<xsl:variable name="dvt_FilteredRowsText" select="$Rows[.=$dvt_filterval or ($dvt_filtertype='date' and substring-before($dvt_filterval,'T') = substring-before(.,'T'))]" />
<xsl:variable name="dvt_FilteredRows" select="$Rows[normalize-space(*[name()=$dvt_filterfield])=$dvt_filterval or ($dvt_filtertype='date' and substring-before($dvt_filterval,'T') = substring-before(normalize-space(*[name()=$dvt_filterfield]),'T'))]" />
<xsl:variable name="dvt_FilteredRowsAttr" select="$Rows[normalize-space(#*[name()=$dvt_FieldNameNoAtSign])=$dvt_filterval or ($dvt_filtertype='date' and substring-before($dvt_filterval,'T') = substring-before(normalize-space(#*[name()=$dvt_FieldNameNoAtSign]),'T'))]" />
<xsl:variable name="dvt_RowCount">
<xsl:choose>
<xsl:when test="$dvt_adhocfiltermode != 'query' and $dvt_filterfield">
<xsl:choose>
<xsl:when test="starts-with($dvt_filterfield, '#')"><xsl:value-of select="count($dvt_FilteredRowsAttr)" /></xsl:when>
<xsl:when test="$dvt_filterfield = '.'"><xsl:value-of select="count($dvt_FilteredRowsText)" /></xsl:when>
<xsl:otherwise><xsl:value-of select="count($dvt_FilteredRows)" /></xsl:otherwise>
</xsl:choose>
</xsl:when>
<xsl:otherwise><xsl:value-of select="count($Rows)" /></xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="RowLimit" select="10" />
<xsl:variable name="FirstRow" select="$dvt_firstrow" />
<xsl:variable name="LastRow">
<xsl:choose>
<xsl:when test="($FirstRow + $RowLimit - 1) > $dvt_RowCount"><xsl:value-of select="$dvt_RowCount" /></xsl:when>
<xsl:otherwise><xsl:value-of select="$FirstRow + $RowLimit - 1" /></xsl:otherwise>
</xsl:choose>
</xsl:variable>
<xsl:variable name="IsEmpty" select="$dvt_RowCount = 0 or $RowLimit = 0" />
<xsl:variable name="dvt_IsEmpty" select="$dvt_RowCount = 0"/>
<xsl:call-template name="dvt_1.toolbar">
<xsl:with-param name="Rows" select="$Rows" />
</xsl:call-template>
<xsl:choose>
<xsl:when test="$dvt_IsEmpty">
<xsl:call-template name="dvt_1.empty"/>
</xsl:when>
Is this what you were looking for?
Umm, if this helps, in the list that I'm using to populate the dropdown, the 'Year' field has an internal name #Title. Would that have something to do with this?
<xsl:template name="dvt_1.rowview">
<option>
<xsl:value-of select="#Title" />
</option>
</xsl:template>
. But it also has #Year, so not sure which is which.
<td class="ms-vb">
<xsl:value-of select="#Year"/>
</td>
Oops, sorry for confusing. The 2nd #Year is the calculated column which I'd created.
UPDATE 2: The code you'd requested:
<td class="ms-toolbar" nowrap="nowrap">
<xsl:call-template name="dvt.filterfield">
<xsl:with-param name="fieldname">#Year</xsl:with-param>
<xsl:with-param name="fieldtitle">Year</xsl:with-param>
<xsl:with-param name="Rows" select="$Rows" />
<xsl:with-param name="fieldtype">text</xsl:with-param>
</xsl:call-template>
Something like this has been created for both the dvwp's:
<xsl:param name="ListID">{6889CA36-79AC-4FA8-9F0A-C013C944B3C5}</xsl:param>
<xsl:param name="Param1" />

Answer 1

I just noticed(thanks to a colleague of mine) that Year which is a calculated column is as a string. So, for 2013, it was storing it as 2,013 because of which I couldn't filter the DVWP properly. I used =TEXT(([columnname], "yyyy") instead of YEAR([colname]) and everything worked fine.

Answer 2

If your parameter name is called param1, then I believe your dropdown will need to pass a query string parameter called "param1" into the URL instead of "year". Could you try modifying that select tag to be like this?:
<select name="ID" size="1"
onchange="document.location.href='http://server/site.aspx?param1='
+ this.options[selectedIndex].value">