将div元素隐藏在代码后面

时间:2015-10-14 13:41:25

标签: c# html css asp.net

我制作了幻灯片。每个幻灯片都有一个放在它顶部的div。 div包含一些文本。我想要做的是,如果h2p元素没有文本,则隐藏包含它们的div。我试图隐藏转发器DataBound事件中的div,但它仍然显示幻灯片上的div。

这是我到目前为止所拥有的:

ASPX:

<asp:Repeater ID="rptSlides" runat="server" ClientIDMode="Static" OnItemDataBound="rptSlides_ItemDataBound">
    <ItemTemplate>
        <div runat="server" id="slideDiv" class="slide">
            <img runat="server" src='<%# Eval("slideImgPath")%>' />
            <div id="slideTextdiv" runat="server" class="slideText">
                <h2 id="titlePlaceHolder" runat="server" class="slideTitle text-center text-capitalize h2 ">
                    <%# Eval("slideTitle") %>
                </h2>
                <p id="textPlaceHolder" runat="server" class="slideDes">
                    <%# Eval("slideDesc") %>
                </p>
            </div>
        </div>
    </ItemTemplate>
</asp:Repeater>

代码背后:

 protected void rptSlides_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    foreach (RepeaterItem item in rptSlides.Items)
    {
        HtmlGenericControl titleText = (HtmlGenericControl)item.FindControl("titlePlaceHolder");
        HtmlGenericControl slidetextDesc = (HtmlGenericControl)item.FindControl("textPlaceHolder");
        HtmlGenericControl slideDiv = (HtmlGenericControl)item.FindControl("slideTextdiv");

        if (titleText.InnerText == "" && slidetextDesc.InnerText == "")
        {
            slideDiv.Style.Add("Display", "none");                
        }
    }
}

更多信息

我也尝试了以下内容:

foreach (RepeaterItem item in rptSlides.Items)
    {
        HtmlGenericControl slideDiv = (HtmlGenericControl)FindControlRecursive(item, "slideTextdiv");
        HtmlGenericControl titleText = (HtmlGenericControl)FindControlRecursive(item, "titlePlaceHolder");
        HtmlGenericControl slidetextDesc = (HtmlGenericControl)FindControlRecursive(item, "textPlaceHolder");


        if (string.IsNullOrWhiteSpace(titleText.InnerText) && string.IsNullOrWhiteSpace(slidetextDesc.InnerText))
        {
            slideDiv.Attributes["class"] = "emptySlideText";
        }
    }

我在css中创建了一个名为emptySlideText的类,如下所示:

.emptySlideText {
display:none; }

不幸的是,这没有任何效果。

我也尝试过更改行

slideDiv.Style.Add(“显示”,“无”);

slideDiv.Attributes.Add(“style”,“display:none”);

但是它再次没有区别

1 个答案:

答案 0 :(得分:2)

首先,您的foreach事件中不需要rptSlides_ItemDataBound循环,因为转发器控件的ItemDataBound事件会针对每个项目进行迭代。下一个Div不是HtmlGenericControl控件,而是HtmlControl控件。完成此操作后,您可以使用Visible属性隐藏div,如下所示: -

protected void rptSlides_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
   if (e.Item.ItemType == ListItemType.AlternatingItem || e.Item.ItemType == ListItemType.Item)
   {
       HtmlControl slideTextdiv = (HtmlControl)e.Item.FindControl("slideTextdiv");
       HtmlGenericControl titlePlaceHolder = (HtmlGenericControl)e.Item.FindControl("titlePlaceHolder");
       HtmlGenericControl textPlaceHolder = (HtmlGenericControl)e.Item.FindControl("textPlaceHolder");

       if (titlePlaceHolder != null)
               titlePlaceHolder.InnerText = Regex.Replace(titlePlaceHolder.InnerText, @"\r\n?|\n", "").Trim();

       if (textPlaceHolder != null)
               textPlaceHolder.InnerText = Regex.Replace(textPlaceHolder.InnerText, @"\r\n?|\n", "").Trim();

       if (String.IsNullOrEmpty(titlePlaceHolder.InnerText) && String.IsNullOrEmpty(textPlaceHolder.InnerText))
       {
           slideTextdiv.Visible = false;
       }
   }
}

请包含using System.Text.RegularExpressions;以导入Regex课程。