格式化asp：DataPager以在ul li中显示

时间：2012-11-15 09:34:40

标签： c# asp.net twitter-bootstrap datapager

我正在使用Twitter Bootstrap和ASP.Net C＃Webforms构建一个网站。我的页面上有一个ListView，其中绑定了DataPager，但我需要改变.Net呈现DataPager的HTML。

目前，所有寻呼机项目都显示如下：

<div class="clearfix pagination pagination-centered"> <span id="cpBody_dpListing"> <a class="aspNetDisabled">First</a>&nbsp;<span>1</span>&nbsp; <a href="javascript:__doPostBack('ctl00$cpBody$dpListing$ctl02$ctl01','')">2</a>&nbsp; <a href="javascript:__doPostBack('ctl00$cpBody$dpListing$ctl03$ctl00','')">Last</a>&nbsp; </span> </div>

但是我需要将所有项目包装在无序列表中，而不是跨度和标签。 我目前的加价看起来像这样：

<div class="clearfix pagination pagination-centered">
<asp:DataPager ID="dpListing" runat="server" PagedControlID="lvListing" PageSize="10" OnPreRender="dpListing_PreRender">
    <Fields>
        <asp:TemplatePagerField>
            <PagerTemplate>
                <asp:BulletedList ID="listPages" runat="server" DisplayMode="LinkButton" OnClick="listPages_Click"></asp:BulletedList>
            </PagerTemplate>
        </asp:TemplatePagerField>
        <asp:NextPreviousPagerField ButtonType="Link" ShowFirstPageButton="true" ShowNextPageButton="false" ShowPreviousPageButton="false" />
        <asp:NumericPagerField PreviousPageText="&lt; Prev 10" NextPageText="Next 10 &gt;" ButtonCount="10" />
        <asp:NextPreviousPagerField ButtonType="Link" ShowLastPageButton="true" ShowNextPageButton="false" ShowPreviousPageButton="false" />
    </Fields>
</asp:DataPager>

我不知何故需要覆盖NextPreviousPagerField和NumericPagerField，以便输出＆lt; li＆gt;标签而不是＆lt; span＆gt;和＆lt; a＆gt;。

4 个答案:

答案 0 :(得分：14)

DataPager不支持开箱即用，因此您需要自定义控件。幸运的是，它实施起来很棒！

对于每个DataPagerField，DataPager会将DataPagerFieldItem控件添加到其自己的控件集合中，然后告诉该字段在该项目中创建其控件。内置字段将在按钮之间添加不间断的空格（除非您将RenderNonBreakingSpacesBetweenControls属性设置为false），但它们很容易识别和抑制。

此控件仍会为已启用按钮呈现<a>标记，并为当前页码呈现<span>标记，但应该接近您所需的标记：

public class UnorderedListDataPager : DataPager
{
   protected override HtmlTextWriterTag TagKey 
   {
      get { return HtmlTextWriterTag.Ul; }
   }

   protected override void RenderContents(HtmlTextWriter writer)
   {
      if (HasControls())
      {
         foreach (Control child in Controls)
         {
            var item = child as DataPagerFieldItem;
            if (item == null || !item.HasControls())
            {
                child.RenderControl(writer);
                continue;
            }

            foreach (Control button in item.Controls)
            {
               var space = button as LiteralControl;
               if (space != null && space.Text == "&nbsp;") continue;

               writer.RenderBeginTag(HtmlTextWriterTag.Li);
               button.RenderControl(writer);
               writer.RenderEndTag();
            }
         }
      }
   }
}

HTML输出：

<ul id="dpListing">
   <li><a class="aspNetDisabled">First</a></li>
   <li><span>1</span></li>
   <li><a href="javascript:__doPostBack('ctl00$cpBody$dpListing$ctl02$ctl01','')">2</a></li>
   <li><a href="javascript:__doPostBack('ctl00$cpBody$dpListing$ctl03$ctl00','')">Last</a></li>
</ul>

答案 1 :(得分：9)

我对此有一个稍微不同的解决方案。我没有改变DataPager的渲染，而是略微调整了标记，在渲染方面，它仍然看起来像“类似引导程序”，即使它没有带分页类的UL / LI标记。

一个非常重要的事情（如https://stackoverflow.com/a/19398488/1948625中所述）是为禁用控件更改类asp.net输出，它默认为“aspNetDisabled”，但对于bootstrap，只需使用“disabled”就好了。在Global.asax的Application_Start中执行此操作。如果不这样做，则第一页，上一页，下一页和最后一页按钮不会显示为禁用。

void Application_Start(object sender, EventArgs e)
{
    WebControl.DisabledCssClass = "customDisabledClassName";
}

来源：WebControl.DisabledCssClass Property (MSDN) 

    <asp:DataPager ID="it" runat="server" class="btn-group btn-group-sm">
        <Fields>
            <asp:NextPreviousPagerField PreviousPageText="<" FirstPageText="|<" ShowPreviousPageButton="true"
                ShowFirstPageButton="true" ShowNextPageButton="false" ShowLastPageButton="false"
                ButtonCssClass="btn btn-default" RenderNonBreakingSpacesBetweenControls="false" RenderDisabledButtonsAsLabels="false" />
            <asp:NumericPagerField ButtonType="Link" CurrentPageLabelCssClass="btn btn-primary disabled"  RenderNonBreakingSpacesBetweenControls="false"
                NumericButtonCssClass="btn btn-default" ButtonCount="10" NextPageText="..." NextPreviousButtonCssClass="btn btn-default" />
            <asp:NextPreviousPagerField NextPageText=">" LastPageText=">|" ShowNextPageButton="true"
                ShowLastPageButton="true" ShowPreviousPageButton="false" ShowFirstPageButton="false"
                ButtonCssClass="btn btn-default" RenderNonBreakingSpacesBetweenControls="false" RenderDisabledButtonsAsLabels="false"/>
        </Fields>
    </asp:DataPager>

上面的Asp.net服务器标记呈现为此寻呼机： asp.net server markup renders as this pager

这是渲染的html：

<span id="ctl00_Body_CaseList918421504_ListControl_Pager_it" class="btn-group btn-group-sm">
    <a class="disabled btn btn-default">|&lt;</a>
    <a class="disabled btn btn-default">&lt;</a>
    <span class="btn btn-primary disabled">1</span>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl01','')">2</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl02','')">3</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl03','')">4</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl04','')">5</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl05','')">6</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl06','')">7</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl07','')">8</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl08','')">9</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl09','')">10</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl01$ctl10','')">...</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl02$ctl00','')">&gt;</a>
    <a class="btn btn-default" href="javascript:__doPostBack('ctl00$Body$CaseList918421504_ListControl$Pager$it$ctl02$ctl01','')">&gt;|</a>
</span>

答案 2 :(得分：8)

除了理查德的答案之外......我使用他的方法并添加了对“禁用”和“活动”类以及周围div-Tag的支持 -

更新：我添加了John对active-Label特殊渲染的建议，作为正确呈现 pagination-sm 和 pagination-lg的超链接。非常感谢和感谢约翰。

更新2：为控件添加了 id 的渲染。感谢DGibbs。

    [
    Bindable(false),
    Category("Appearance"),
    DefaultValue("pagination pagination-centered"),
    Description("Css class for the surrounding div")
    ]
    public virtual string CssClass {
        get {
            if (ViewState["CssClass"] == null) {
                ViewState["CssClass"] = "pagination pagination-centered";
            }
            return (string)ViewState["CssClass"];
        }
        set {
            ViewState["CssClass"] = value;
        }
    }

    protected override HtmlTextWriterTag TagKey {
        get {
                return HtmlTextWriterTag.Div;
        }
    }

    protected override void AddAttributesToRender(HtmlTextWriter writer) {
            if (HasControls()) {
                writer.AddAttribute("id", base.ClientID);
                writer.AddAttribute(HtmlTextWriterAttribute.Class, CssClass);
            }
    }

    protected override void RenderContents(HtmlTextWriter writer) {
        if (HasControls()) {
            writer.RenderBeginTag(HtmlTextWriterTag.Ul);

            foreach (Control child in Controls) {
                var item = child as DataPagerFieldItem;
                if (item == null || !item.HasControls()) {
                    child.RenderControl(writer);
                    continue;
                }

                foreach (Control ctrl in item.Controls) {
                    var space = ctrl as LiteralControl;
                    if (space != null && space.Text == "&nbsp;")
                        continue;

                    // Set specific classes for li-Tag
                    bool isCurrentPage = false
                    if (ctrl is System.Web.UI.WebControls.WebControl) {
                        // Enabled = false -> "disabled"
                        if (!((System.Web.UI.WebControls.WebControl)ctrl).Enabled) {
                            writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");
                        }

                        // there can only be one Label in the datapager -> "active"
                        if (ctrl is System.Web.UI.WebControls.Label) {
                           isCurrentPage = true;                     
                           writer.AddAttribute(HtmlTextWriterAttribute.Class, "active");
                        }
                    }
                    writer.RenderBeginTag(HtmlTextWriterTag.Li);
                    // special rendering as hyperlink for current page
                    if (isCurrentPage) {
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                    }
                    ctrl.RenderControl(writer);
                    if (isCurrentPage) {
                        writer.RenderEndTag(); // A
                    }
                    writer.RenderEndTag();
                }
            }

            writer.RenderEndTag();
        }
   }

答案 3 :(得分：1)

我对Andreas的回答做了其他更改。 Bootstrap示例将当前页面（活动）页面包装在超链接标记内，因此我注意到在选择大小变化（如pagination-lg或pagination-sm）时，某些Bootstrap模板无法正确格式化活动标记。这是我的RenderContents版本，添加了额外的超链接包装：

    protected override void RenderContents(HtmlTextWriter writer)
    {
        if (HasControls())
        {
            foreach (Control child in Controls)
            {
                var item = child as DataPagerFieldItem;
                if (item == null || !item.HasControls())
                {
                    child.RenderControl(writer);
                    continue;
                }

                foreach (Control ctrl in item.Controls)
                {
                    var space = ctrl as LiteralControl;
                    if (space != null && space.Text == "&nbsp;")
                        continue;

                    // Set specific classes for li-Tag
                    var isCurrentPage = false;
                    if (ctrl is WebControl)
                    {
                        // Enabled = false -> "disabled"
                        if (!((WebControl)ctrl).Enabled)
                            writer.AddAttribute(HtmlTextWriterAttribute.Class, "disabled");

                        // there can only be one Label in the datapager -> "active"
                        if (ctrl is Label)
                        {
                            isCurrentPage = true;
                            writer.AddAttribute(HtmlTextWriterAttribute.Class, "active");
                        }
                    }

                    writer.RenderBeginTag(HtmlTextWriterTag.Li);
                    if (isCurrentPage)
                    {
                        writer.AddAttribute(HtmlTextWriterAttribute.Href, "#");
                        writer.RenderBeginTag(HtmlTextWriterTag.A);
                    }
                    ctrl.RenderControl(writer);
                    if (isCurrentPage)
                        writer.RenderEndTag();
                    writer.RenderEndTag();
                }
            }
        }
    }
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