Howto: Use a form web part to filter or show all values in a data view web part - FrontPoint - Site Home

On a new page insert a few of the Announcements list
Insert a Form Web Part
Change the input type of the Form to be a drop-down field and add some values:
1. All
2. 1
3. 2
Place the cursor into the Data View you created in Step 1 and click on Table..Select > Row
Click on Data..Conditional Formatting
Click on Create
Click on “Show content...“
Field Name == ID
Comparison == Equals
Value == [Input Paramter]
Click OK
Right click the Form Web Part > Web Part Connections
Provide Data Values to...
Web Part on this page...
Modify view using Parameters from...
D1 == Input Parameter
Finish the wizard
Now switch to code view
Add some code so that if the Input Parameter says “All“ you show all values:

currently, the dvt_1.body template looks like this:

         <xsl:template name="dvt_1.body">
             <xsl:param name="Rows"/>
             <xsl:param name="FirstRow"/>
             <xsl:param name="LastRow"/>
             <xsl:for-each select="$Rows">
                 <xsl:variable name="KeepItemsTogether" select="false()"/>
                 <xsl:variable name="HideGroupDetail" select="false()"/>
                 <xsl:variable name="GroupStyle" select="'auto'"/>
                 <xsl:if test="(position() >= $FirstRow and position() <= $LastRow) or $KeepItemsTogether">
                     <xsl:if test="not($HideGroupDetail)" ddwrt:cf_ignore="1">
                         <xsl:if test="@ID = $filterParam">
                             <tr style="display:{$GroupStyle}">
                                 <td class="ms-vb"><xsl:value-of select="@Title"/></td>
                                 <td class="ms-vb"><xsl:value-of select="@Editor"/></td>
                                 <td class="ms-vb"><xsl:value-of select="ddwrt:FormatDate(string(@Modified), 1033, 5)"/></td>
                             </tr>
                         </xsl:if>
                     </xsl:if>
                 </xsl:if>
             </xsl:for-each>
         </xsl:template>

You need to add the code in bright red:

         <xsl:template name="dvt_1.body">
             <xsl:param name="Rows"/>
             <xsl:param name="FirstRow"/>
             <xsl:param name="LastRow"/>
             <xsl:for-each select="$Rows">
                 <xsl:variable name="KeepItemsTogether" select="false()"/>
                 <xsl:variable name="HideGroupDetail" select="false()"/>
                 <xsl:variable name="GroupStyle" select="'auto'"/>
                 <xsl:if test="(position() >= $FirstRow and position() <= $LastRow) or $KeepItemsTogether">
                     <xsl:if test="not($HideGroupDetail)" ddwrt:cf_ignore="1">
                         <xsl:if test="@ID = $filterParam or $filterParam = 'All'">
                             <tr style="display:{$GroupStyle}">
                                 <td class="ms-vb"><xsl:value-of select="@Title"/></td>
                                 <td class="ms-vb"><xsl:value-of select="@Editor"/></td>
                                 <td class="ms-vb"><xsl:value-of select="ddwrt:FormatDate(string(@Modified), 1033, 5)"/></td>
                             </tr>
                         </xsl:if>
                     </xsl:if>
                 </xsl:if>
             </xsl:for-each>
         </xsl:template>

20. Save the page and check it out in the browser.