如何使用XSLT C＃创建Dropdownlist？

Question

我正在使用xslt文件显示重复项的项目。 如下：

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output omit-xml-declaration="yes" indent="yes" />
  <xsl:param name="BasePath" select="/" />
  <xsl:param name="OffersPerPage" select="4" />
  <xsl:template match="/" xml:space="default">
   <div class="offers_section">
<script>
 $(document).ready(function() {
   $(".offers_page").hide();
   $("#OfferPage1").show();
  });
 function OffersPageChange(CurrentPage, NewPage)
  {
   $("#OfferPage" + CurrentPage).hide();
$("#OfferPage" + NewPage).show();
 $("$offers_section").focus();
 return false;
 }
</script>

<xsl:choose>
  <xsl:when test="count(//Offers/Offer) &gt; 0">

  <xsl:for-each select="//Offers/Offer[(position()) mod $OffersPerPage = 1 or position = 1]">
    <xsl:variable name="page" select="position()" />
    <xsl:variable name="lastpage" select="last()" />

    <div class="offers_page"><xsl:attribute name="id">OfferPage<xsl:value-of select="$page" /></xsl:attribute>
      <div class="offers_paging">
        <xsl:if test="$page &gt; 1">
        <a href="#"><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="$page - 1" />)</xsl:attribute>&lt; Previous</a>
        </xsl:if>

        <xsl:if test="$page &lt; $lastpage">
        <a href="#"><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="$page + 1" />)</xsl:attribute>Next &gt;</a>
        </xsl:if>
        <br /><br />

        <xsl:if test="$lastpage != 1">
          <xsl:for-each select="//Offers/Offer">
            <xsl:if test="(position() - 1) mod $OffersPerPage = 0">
              <a href="#"><xsl:attribute name="class"><xsl:choose><xsl:when test="(position() - 1) div $OffersPerPage + 1 = $page">offers_page_number_active</xsl:when><xsl:otherwise>offers_page_number</xsl:otherwise></xsl:choose></xsl:attribute><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="(position() - 1) div $OffersPerPage + 1" />)</xsl:attribute><xsl:value-of select="(position() - 1) div $OffersPerPage + 1" /></a>
            </xsl:if>
          </xsl:for-each>
          <br /><br />
        </xsl:if>
      </div>

      <xsl:for-each select=". | following-sibling::Offer[(position()) &lt; $OffersPerPage]" >
        <div class="offers_offer">
          <h2><xsl:value-of select="Partner" /></h2>

          <xsl:if test="ImageSource != ''">
          <div class="offers_image_container">
            <div class="offers_image">
              <img width="100%"><xsl:attribute name="src"><xsl:value-of select="$BasePath" />portals/<xsl:value-of select="ImageSource" /></xsl:attribute></img>
            </div>
            <div class="offers_image_overlay">
              <img width="100%" height="33" alt=""><xsl:attribute name="src"><xsl:value-of select="$BasePath" />portals/_default/skins/images/offer%20top%20swoop.png</xsl:attribute></img>
              <img width="100%" height="126" style="position:absolute;bottom:0;left:0;right:0;" alt=""><xsl:attribute name="src"><xsl:value-of select="$BasePath" />portals/_default/skins/images/offer%20bottom%20swoop.png</xsl:attribute></img>
            </div>
          </div>
          </xsl:if>

          <xsl:if test="Description != ''">
          <div class="offers_description">
            <xsl:value-of select="Description" /><br />
          </div>
          </xsl:if>

          <xsl:if test="LegalInformation != '' and LegalOnOfferPage = 'True'">
          <div class="offers_legal">
            <xsl:value-of select="LegalInformation" /><br />
          </div>
          </xsl:if>

          <xsl:if test="Facebook != '' or Twitter != ''">
          <div class="offers_social_media">
            Follow us on:<br />
            <div class="social_media_links">
              <xsl:if test="Facebook != ''">
              <a class="facebook_logo" style="float:none;" target="_blank" title="Facebook"><xsl:attribute name="href"><xsl:value-of select="Facebook" /></xsl:attribute></a>
              </xsl:if>
              <xsl:if test="Twitter != ''">
              <a class="twitter_logo" style="float:none;" target="_blank" title="Twitter"><xsl:attribute name="href">https://www.twitter.com/<xsl:value-of select="Twitter" /></xsl:attribute></a>
              </xsl:if>
            </div>
          </div>
          </xsl:if>

          <xsl:if test="UrlText != ''">
          <div class="offers_url">
          <a target="_blank"><xsl:attribute name="href"><xsl:value-of select="Url" /></xsl:attribute><xsl:value-of select="UrlText" /></a>
          </div>
          </xsl:if>

          <xsl:if test="Email != ''">
          <div class="offers_email">
          Email: <a><xsl:attribute name="href">mailto:<xsl:value-of select="Email" /></xsl:attribute><xsl:value-of select="Email" /></a>
          </div>
          </xsl:if>

          <xsl:if test="Phone != ''">
          <div class="offers_phone">
          Tel no: <strong><xsl:value-of select="Phone" /></strong>
          </div>
          </xsl:if>
        </div>
      </xsl:for-each>
      <xsl:if test="$lastpage &gt; 1">

      <div class="offers_paging">
        <xsl:if test="$lastpage != 1">
          <xsl:for-each select="//Offers/Offer">
            <xsl:if test="(position() - 1) mod $OffersPerPage = 0">
              <a href="#"><xsl:attribute name="class"><xsl:choose><xsl:when test="(position() - 1) div $OffersPerPage + 1 = $page">offers_page_number_active</xsl:when><xsl:otherwise>offers_page_number</xsl:otherwise></xsl:choose></xsl:attribute><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="(position() - 1) div $OffersPerPage + 1" />)</xsl:attribute><xsl:value-of select="(position() - 1) div $OffersPerPage + 1" /></a>
            </xsl:if>
          </xsl:for-each>
          <br /><br />
        </xsl:if>

        <xsl:if test="$page &gt; 1">
        <a href="#"><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="$page - 1" />)</xsl:attribute>&lt; Previous</a>
        </xsl:if>

        <xsl:if test="$page &lt; $lastpage">
        <a href="#"><xsl:attribute name="onclick">return OffersPageChange(<xsl:value-of select="$page" />, <xsl:value-of select="$page + 1" />)</xsl:attribute>Next &gt;</a>
        </xsl:if>
      </div>
      </xsl:if>
    </div>
  </xsl:for-each>
  </xsl:when>
  <xsl:otherwise>
    <div class="offers_not_available">
      Sorry, no offers are currently available in this category
    </div>
  </xsl:otherwise>
</xsl:choose>
</div>

代码背后的代码是：

 void Load_Category(int CategoryId)
    {
        string skinPath = PortalSettings.ActiveTab.SkinPath;

        XDocument XDocOffers = new XDocument(new XElement("Offers"));
        SqlDataProvider provider = new SqlDataProvider();
        SqlConnection SQLConnection = new SqlConnection(provider.ConnectionString);
        SQLConnection.Open();

        SqlConnection SQLConnectionAnswers = new SqlConnection(provider.ConnectionString);
        SQLConnectionAnswers.Open();

        SqlCommand sqlComm = new SqlCommand("CIDOTOffersGetOffersByCategory", SQLConnection);
        sqlComm.CommandType = CommandType.StoredProcedure;

        sqlComm.Parameters.Add(new SqlParameter("@CategoryId", SqlDbType.Int)).Value = CategoryId;

        SqlDataReader OffersReader = sqlComm.ExecuteReader();

        string OfferId;
        string Partner;
        string Description;
        string ImageSource;
        string Url;
        string UrlText;
        string Email;
        string Phone;
        string LegalInformation;
        string Facebook;
        string Twitter;
        string LegalOnOfferPage;
        string onclick;
        string Emailonclick;
        while (OffersReader.Read())
        {
            OfferId = OffersReader["OfferId"].ToString();
            Partner = OffersReader["Partner"].ToString();
            Description = OffersReader["Description"].ToString();
            ImageSource = OffersReader["ImageSource"].ToString();
            Url = OffersReader["Url"].ToString();
            UrlText = OffersReader["UrlText"].ToString();
            Email = OffersReader["Email"].ToString();
            Phone = OffersReader["Phone"].ToString();
            LegalInformation = OffersReader["LegalInformation"].ToString();
            Facebook = OffersReader["Facebook"].ToString();
            Twitter = OffersReader["Twitter"].ToString();
            LegalOnOfferPage = OffersReader["LegalOnOfferPage"].ToString();
            onclick = "_gaq.push(['_trackEvent', 'Book Now', 'click', '" + Partner + "']);";
            Emailonclick = "_gaq.push(['_trackEvent', 'Email', 'click', '" + Email + "']);";
            XElement NextOffer =
              new XElement("Offer",
                new XElement("OfferId", OfferId),
                new XElement("Partner", Partner),
                new XElement("Description", Description),
                new XElement("ImageSource", ImageSource),
                new XElement("Url", Url),
                new XElement("UrlText", UrlText),
                new XElement("Email", Email),
                new XElement("Phone", Phone),
                new XElement("LegalInformation", LegalInformation),
                new XElement("Facebook", Facebook),
                new XElement("Twitter", Twitter),
                new XElement("LegalOnOfferPage", LegalOnOfferPage),
                new XElement("onclick", onclick),
                new XElement("Emailonclick", Emailonclick)
              );

            XDocOffers.Element("Offers").Add(NextOffer);
        }

        OffersReader.Close();
        SQLConnection.Close();

        string XSLTFile = Server.MapPath(skinPath + "xslt/offers.xslt");
        if (File.Exists(XSLTFile))
        {
            StringWriter XSLTOutput = new StringWriter();
            XmlWriter XMLOutput = XmlWriter.Create(XSLTOutput);

            // Load the style sheet.
            XslCompiledTransform xslt = new XslCompiledTransform();
            xslt.Load(XSLTFile);

            XsltArgumentList ArgumentsQA = new XsltArgumentList();

            if (Settings.ContainsKey("OffersPerPage"))
            {
                ArgumentsQA.AddParam("OffersPerPage", "", Settings["OffersPerPage"].ToString());
            }
            else
            {
                ArgumentsQA.AddParam("OffersPerPage", "", "4");
            }

            ArgumentsQA.AddParam("BasePath", "", "/");

            // Execute the transform and output the results to a writer.
            xslt.Transform(XDocOffers.CreateReader(), ArgumentsQA, XMLOutput);

            //Output.Controls.Add(new LiteralControl(XSLTOutput.ToString().Replace("&", "&")));
            Output.Controls.Add(new LiteralControl(HttpUtility.HtmlDecode(XSLTOutput.ToString())));

        }
        else
        {
            Output.Controls.Add(new LiteralControl("Cannot find XSLT file"));
        }
    }

我以前从未使用过xslt，现在我想向页面添加一个下拉列表，并需要从页面正文中重复的项目中搜索所选值。

我的问题是：

1. 我如何在xslt中创建一个dropdownlist。 我已经尝试了以下链接，但对我没有用。 使用C＃在xslt中生成动态下拉列表

2. 如何创建一个将从重复项中搜索的事件。 有什么方法可以调用下拉列表的selectedindex更改事件？

请帮忙。

Answer 1

您可以创建一个DropDownList

<asp:DropDownList xmlns:asp="System.Web.UI.WebControls" ID="TheDdl" OnSelectedIndexChanged="Selection_Change" runat="server">
   <asp:ListItem Value="1" Text="Text 1" />
   <asp:ListItem Value="2" Text="Text 2" />
   <asp:ListItem Value="3" Text="Text 3" />
</asp:DropDownList>

Code behind的Code behind看起来像

void Selection_Change(Object sender, EventArgs e)
{
    // do something ...
}

Answer 2

Xslt只是将某些源XML转换为某些格式的文本，通常是HTML或XML。 您的xslt正在创建html代码，其中一些<div class =“ offers_section”>。 我看到xslt代码中绑定了一些链接。

此生成的html代码存储在字符串XSLTOutput.ToString（）中，该字符串稍后作为文字控件插入到ASP页中。 后面的代码通过从数据库检索一些数据来创建源XML文档XDocOffers。

您可以编辑已提供的xslt代码，并允许其插入html控件<选择>和<选项>，而不是使用ASP的<asp：dropdownlist>。

如果您想使用一些<asp：dropdownlist>控件，我想您正在尝试使用XDocOffers作为数据源。 如果不是这样，您将必须执行自己的代码才能从数据库中查询。

您可以运行代码并观看XDocOffers XML文档及其结构。 然后，您可以专门询问要用作下拉键的成员，以及哪个是下拉值。 并专门讨论下拉控件的问题。