如何使用“阅读更多”链接限制 GridView 中的标签字符串长度

本文关键字：GridView 标签 字符串 链接 何使用 阅读更多 | 更新日期: 2023-09-27 17:56:26

目前我是这样使用的...

<asp:TemplateField HeaderText="Description">
 <ItemTemplate>
      <asp:Label ID="lblDescription" runat="server"
                Text='<%# Limit(Eval("Description"),40) %>' >
      </asp:Label>
 </ItemTemplate>

帮助程序函数：

public static string Limit(object Desc, int length)
{
    StringBuilder strDesc = new StringBuilder();
    strDesc.Insert(0, Desc.ToString());
    if (strDesc.Length > length)
        return strDesc.ToString().Substring(0, length) + "..." + [Read More];
    else return strDesc.ToString();
}

但我不知道如何放置[阅读更多]链接...

如何使用“阅读更多”链接限制 GridView 中的标签字符串长度

做这样的事情。

标记

<asp:TemplateField HeaderText="Description">
 <ItemTemplate>
      <asp:Label ID="lblDescription" runat="server"
                Text='<%# Limit(Eval("Description"),40) %>' 
                Tooltip='<%# Eval("Description") %>'>
      </asp:Label>
      <asp:LinkButton ID="ReadMoreLinkButton" runat="server"
                Text="Read More"
                Visible='<%# SetVisibility(Eval("Description"), 40) %>'
                OnClick="ReadMoreLinkButton_Click">
      </asp:LinkButton>
 </ItemTemplate>
</asp:TemplateField>

和代码隐藏

protected bool SetVisibility(object desc, int maxLength)
{
    var description = (string)desc;
    if (string.IsNullOrEmpty(description)) { return false; }
    return description.Length > maxLength;
}
protected void ReadMoreLinkButton_Click(object sender, EventArgs e)
{
    LinkButton button = (LinkButton)sender;
    GridViewRow row = button.NamingContainer as GridViewRow;
    Label descLabel = row.FindControl("lblDescription") as Label;
    button.Text = (button.Text == "Read More") ? "Hide" : "Read More";
    string temp = descLabel.Text;
    descLabel.Text = descLabel.ToolTip;
    descLabel.ToolTip = temp;
}
protected string Limit(object desc, int maxLength)
{
    var description = (string)desc;
    if (string.IsNullOrEmpty(description)) { return description; }
    return description.Length <= maxLength ? 
        description : description.Substring(0, maxLength)+ "...";
}

在 Label 之后添加一个不可见的 HtmlAnchor 控件。 尝试类似这样的事情，

<asp:TemplateField HeaderText="Description">
 <ItemTemplate>
      <asp:Label ID="lblDescription" runat="server"
                Text='<%# Limit(Eval("Description"),40) %>' >
      </asp:Label>
      <a href="TheReadMorePage" ID="aReadMore" runat="server" Visible="false">[Read More]</a>
 </ItemTemplate>

if(strDesc.Length > length)
{
    var anchor = ((Label)Desc).NamingContainer.FindControl("aReadMore");
    anchor.Visible = true;
    return strDesc.ToString().Substring(0, length) + "...";
}

可以使用"模式弹出"对话框：

在 ASP.Net 页面中：

<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.2.js"></script>
<script type="text/javascript" src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script>
<script type="text/javascript">
$(function() {
$('#btnReadMore').click(function() {
$("#popupdiv").dialog({
title: "jQuery Popup from Server Side",
width: 430,
height: 250,
modal: true,
buttons: {
Close: function() {
$(this).dialog('close');
}
}
});
});
})

<asp:TemplateField HeaderText="Description">
 <ItemTemplate>
      <asp:Label ID="lblDescription" runat="server"
                Text='<%# Limit(Eval("Description"),40) %>' 
                Tooltip='<%# Eval("Description") %>'>
      </asp:Label>
      <input type="button" id="btnReadMore" value="Show Modal Popup" />
 </ItemTemplate>
</asp:TemplateField>
<div>
<div id="popupdiv" title="Basic modal dialog" style="display: none">
</div>
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