[英]Access to div from codebehind who's outside a repeater Asp.net C#
I know its maybe unusual, but i want add htmlGenericControl to a div (it's outside a repeater) in ItemDataBound from CodeBehind.. 我知道它可能很不正常,但是我想在CodeBehind的ItemDataBound中将htmlGenericControl添加到div(在转发器之外)中。
HtmlGenericControl slider = (HtmlGenericControl)e.Item.FindControl("slider");
htmlGenericControl input = new HtmlGenericControl("input");
input.Attributes.Add("type", "radio");
input.Attributes.Add("name", "slide_switch");
input.Attributes.Add("id", string.Format("projectImage-{0}", item.ProjectImageId));
slider.Controls.Add(input);
but its return null everytime. 但每次都返回null 。 this is the aspx code:
这是aspx代码:
<div class="slider">
<asp:Repeater ID="rptProjectImages" runat="server" OnItemDataBound="rptProjectImages_ItemDataBound">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
</div>
Didnt work with asp.net too long, but probably this should help 与asp.net的合作时间过长,但这可能会有所帮助
<div id="myDiv" runat="server">...</div>
and in codebehind myDiv
should be accessible. 并且
myDiv
应该可以访问。
Several issues with this code. 此代码有几个问题。
First, your div is client-side only, from server-side point of view it's just a string. 首先,您的div仅限于客户端,从服务器端来看,它只是一个字符串。 Turn it into server-side control with:
使用以下命令将其转换为服务器端控制:
<div class="slider" runat="server" ID="slider">
Second, FindControl
looks for immediate children only, in your case children of the repeater item. 其次,
FindControl
仅查找直属子级,在您的情况下为转发器项的子级。 slider
is not one of those. slider
不是其中之一。 Moreover, it is not a part of the repeater item template and should be accessible as in in code behind, so just 而且,它不是转发器项目模板的一部分,应该可以像后面的代码中那样访问它,因此
slider.Controls.Add(...
That is unless slider
and the repeater you showed are a part of some other template of some "outer" control. 除非您显示的
slider
和转发器是某些“外部”控件的其他模板的一部分,否则这是必须的。 In which case make sure to use that "outer" control to call FindControl
on. 在这种情况下,请确保使用该“外部”控件来调用
FindControl
。
Finally, don't mess with id
. 最后,不要搞乱
id
。 I bet this is either going to be overridden by ASP.NET, or will cause issues on the page. 我敢打赌这将被ASP.NET覆盖,否则将导致页面出现问题。 Instead set client ID mode to static and assign ID property:
而是将客户端ID模式设置为static并分配ID属性:
input.ClientIDMode = ClientIDMode.Static;
input.ID = string.Format("projectImage_{0}", item.ProjectImageId);
This is eventually output the same value for id
you needed, but in more ASP.NET compliant way. 最终,它会为您所需的
id
输出相同的值,但采用与ASP.NET兼容的方式。 One note though is that I replaced "-" with "_" - server side controls cannot have hyphens in ID 不过请注意,我将“-”替换为“ _”-服务器端控件的ID中不能包含连字符
FindControl finds a control within another, but does so looking for the control's id. FindControl在另一个控件中查找控件,但这样做是在查找控件的ID。 Your "slider" control has no id, it uses a class named "slider" but has no id.
您的“滑块”控件没有ID,它使用名为“滑块”的类,但没有ID。
You will need to define the control as 您将需要定义控件为
<div runat="server" id="Slider" class="slider">
<asp:Repeater ID="rptProjectImages" runat="server" OnItemDataBound="rptProjectImages_ItemDataBound">
<ItemTemplate>
</ItemTemplate>
</asp:Repeater>
</div>
The runat="server"
tells the framework to instantiate that control in your code behind. runat="server"
告诉框架在您后面的代码中实例化该控件。 The id will be the name of the object that is that control. id将是该控件的对象的名称。 Then in your code, you can do
然后在您的代码中,您可以执行
htmlGenericControl input = new HtmlGenericControl("input");
input.Attributes.Add("type", "radio");
input.Attributes.Add("name", "slide_switch");
input.ID = string.Format("projectImage-{0}", item.ProjectImageId);
Slider.Controls.Add(input);
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