使用 ASP.NET 刷新 UpdatePanel 中的 Repeater 控件
我正在尝试编写一个页面,您可以在其中发表评论而无需重新加载整个页面。 注释使用 Repeater 控件显示。 模板如下所示:
<asp:UpdatePanel runat="server" ID="commentsUpdatePanel" UpdateMode="Conditional">
<ContentTemplate>
<!-- Comments block -->
<div class="wrapper bloc content">
<h3><img src="img/comments.png" alt="Comments" /> Comments</h3>
<p><asp:Label ID="viewImageNoComments" runat="server" /></p>
<asp:Repeater ID="viewImageCommentsRepeater" runat="server">
<HeaderTemplate>
<div class="float_box marge wrapper comments">
</HeaderTemplate>
<ItemTemplate>
<div class="grid_25">
<span class="user"><%#Eval("username")%></span><br />
<span style="font-size:x-small; color:#666"><%#Eval("datetime") %></span>
</div>
<div class="grid_75">
<p align="justify"><%#Eval("com_text") %></p>
</div>
</ItemTemplate>
<FooterTemplate>
</div>
</FooterTemplate>
</asp:Repeater>
</div>
<!-- Post comment block -->
<div class="wrapper bloc content">
<h3><a id="post_comment" name="post_comment"><img src="img/comment_edit.png" alt="Comments" /></a> Post
a comment</h3>
<p class="description">Please be polite.</p>
<p>
<asp:Label ID="postCommentFeedback" runat="server" />
</p>
<table border="0">
<tr>
<td valign="top">
<asp:TextBox id="postCommentContent" runat="server" TextMode="MultiLine"
MaxLength="600" Columns="50" Rows="15" Width="400px" />
</td>
<td valign="top">
<span style="font-size:x-small">BBCode is enabled. Usage :<br />
<b>bold</b> : [b]bold[/b]<br />
<i>italic</i> : [i]italic[/i]<br />
<span class="style1">underline</span> : [u]underline[/u]<br />
Link : [url=http://...]Link name[/url]<br />
Quote : [quote=username]blah blah blah[/quote]</span>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="postCommentButton" runat="server" Text="Submit"
onclick="postCommentButton_Click" />
</td>
</tr>
</table>
</div>
</ContentTemplate>
</asp:UpdatePanel>
postCommentButton_Click() 函数运行良好 - 单击“提交”即可发布帖子。 但是,我需要完全重新加载页面才能看到新评论 - 用户刚刚发布的帖子在此之前不会显示。 在 (!isPostBack) 检查后,我在 Page_Load() 中对中继器进行数据绑定。
postCommentButton_Click() 函数如下所示:
protected void postCommentButton_Click(object sender, EventArgs e)
{
// We check if user is authenticated
if (User.Identity.IsAuthenticated)
{
// Attempt to run query
if (Wb.Posts.DoPost(postCommentContent.Text, Request.QueryString["imageid"].ToString(), User.Identity.Name, Request.UserHostAddress))
{
postCommentFeedback.Text = "Your post was sucessful.";
postCommentContent.Text = "";
}
else
{
postCommentFeedback.Text = "There was a problem with your post.<br />";
}
}
// CAPTCHA handling if user is not authenticated
else
{
// CAPTCHA
}
}
在我的例子中,我们确实看到 postCommentFeedback.Text 被刷新,但同样,不是转发器的内容,它应该再有一个帖子。
我缺少什么?
I'm trying to code a page where you can post a comment without reloading the whole page. The comments are displayed using a Repeater control. The template looks like this:
<asp:UpdatePanel runat="server" ID="commentsUpdatePanel" UpdateMode="Conditional">
<ContentTemplate>
<!-- Comments block -->
<div class="wrapper bloc content">
<h3><img src="img/comments.png" alt="Comments" /> Comments</h3>
<p><asp:Label ID="viewImageNoComments" runat="server" /></p>
<asp:Repeater ID="viewImageCommentsRepeater" runat="server">
<HeaderTemplate>
<div class="float_box marge wrapper comments">
</HeaderTemplate>
<ItemTemplate>
<div class="grid_25">
<span class="user"><%#Eval("username")%></span><br />
<span style="font-size:x-small; color:#666"><%#Eval("datetime") %></span>
</div>
<div class="grid_75">
<p align="justify"><%#Eval("com_text") %></p>
</div>
</ItemTemplate>
<FooterTemplate>
</div>
</FooterTemplate>
</asp:Repeater>
</div>
<!-- Post comment block -->
<div class="wrapper bloc content">
<h3><a id="post_comment" name="post_comment"><img src="img/comment_edit.png" alt="Comments" /></a> Post
a comment</h3>
<p class="description">Please be polite.</p>
<p>
<asp:Label ID="postCommentFeedback" runat="server" />
</p>
<table border="0">
<tr>
<td valign="top">
<asp:TextBox id="postCommentContent" runat="server" TextMode="MultiLine"
MaxLength="600" Columns="50" Rows="15" Width="400px" />
</td>
<td valign="top">
<span style="font-size:x-small">BBCode is enabled. Usage :<br />
<b>bold</b> : [b]bold[/b]<br />
<i>italic</i> : [i]italic[/i]<br />
<span class="style1">underline</span> : [u]underline[/u]<br />
Link : [url=http://...]Link name[/url]<br />
Quote : [quote=username]blah blah blah[/quote]</span>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="postCommentButton" runat="server" Text="Submit"
onclick="postCommentButton_Click" />
</td>
</tr>
</table>
</div>
</ContentTemplate>
</asp:UpdatePanel>
The postCommentButton_Click() function works just fine - clicking "Submit" will make the post. However, I need to completely reload the page in order to see new comments - the post the user just made will not show until then. I Databind the Repeater in Page_Load() after a (!isPostBack) check.
The postCommentButton_Click() function looks like this:
protected void postCommentButton_Click(object sender, EventArgs e)
{
// We check if user is authenticated
if (User.Identity.IsAuthenticated)
{
// Attempt to run query
if (Wb.Posts.DoPost(postCommentContent.Text, Request.QueryString["imageid"].ToString(), User.Identity.Name, Request.UserHostAddress))
{
postCommentFeedback.Text = "Your post was sucessful.";
postCommentContent.Text = "";
}
else
{
postCommentFeedback.Text = "There was a problem with your post.<br />";
}
}
// CAPTCHA handling if user is not authenticated
else
{
// CAPTCHA
}
}
In my case, we do see postCommentFeedback.Text refreshed, but, again, not the content of the repeater which should have one more post.
What is it I'm missing?
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您应该在 !IsPostBack 内的 Page_Load 中进行 DataBind。 您还应该在 Click 事件中进行数据绑定。
You should DataBind in the Page_Load within a !IsPostBack as you are. You should ALSO databind in your Click event.
不要让你的数据源成为 MySqlDataReader,而是让你的阅读器填充 BindingList 或类似的东西。 将其保留在会话中,并在每次非回发和单击时进行数据绑定。 当您的用户发帖时,您可以将其添加到列表中并等待某些信息告诉它保存该内容,但在发布评论的上下文中将其帖子保存到您的数据库并重做数据拉取并踩踏您的数据库更有意义BindingList并重新Databind。
另外,个人的不满:我不喜欢<%#Eval....%>。 页面中的代码通常是一个不好的信号。 尝试使用 Repeater.ItemDataBound 事件
http://msdn.microsoft。 com/en-us/library/system.web.ui.webcontrols.repeater.itemdatabound.aspx
Instead of making your datasource a MySqlDataReader, have your reader populate a BindingList or something like that. Keep that in session and do your databind every non-postback and click. When your user posts, you can either add it to the list and wait for something to tell it to save that, but it makes more sense in the context of posting comments to save their post to your db and redo your datapull and stomp over your BindingList and re-Databind.
Also, personal peeve: I dislike <%#Eval....%>. Code in your page is usually a bad sign. Try using the Repeater.ItemDataBound Event
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.repeater.itemdatabound.aspx
在我看来,快速解决办法是在页面加载时绑定,而不管回发。 或者,您可以从 postCommentButton_Click 中重新绑定。
It sounds to me like the quick fix is to bind on page load regardless of postback. Alternatively, you could rebind from within postCommentButton_Click.
尝试将更新面板放在标签之间,如果您已经这样做了,请检查 div 标签的结束是否正确
try putting the update panel between tags and if you have already done that then check if the closing of div tags is proper