回发后丢失自定义参数. [英] Lost custom parameter after postback.

问题描述

我尝试使TreeNode重载以将参数添加到我的节点.我将此参数用作jquery选择器.

I try to overload TreeNode to add a parameter to my node. I use this parameter as jquery selector.

public class Node : TreeNode
{
    public bool ContextMenu { get; set; }

    protected override void RenderPreText(HtmlTextWriter writer)
    {
        base.RenderPreText(writer);
        if (ContextMenu)
        {
            writer.AddAttribute("contextmenu","true");
        }
    }
}

生成页面时，参数在HTML中可见，但回发后会丢失.我试图重载LoadViewState和SaveViewState方法，但没有帮助.我该怎么办?


来自OP的更新程序:
呈现的HTML:

When the page is generated, parameter is visible in the HTML, but after postback it is lost. I tried to overload the LoadViewState and SaveViewState methods but it did not help. What I can do with this ?


UPDATER from OP:
rendered HTML:

<a contextmenu="true" class="MyTreeView_0" href="javascript:__doPostBack('MyTreeView','s1256\\1')" onclick="TreeView_SelectNode(MyTreeView_Data, this,'MyTreeViewt1');" id="MyTreeViewt1"&gt;node1&lt;/a>

回发后呈现HTML:

rendered HTML after postback:

<a class="MyTreeView_0" href="javascript:__doPostBack('MyTreeView','s1256\\1')" onclick="TreeView_SelectNode(MyTreeView_Data, this,'MyTreeViewt1');" id="MyTreeViewt1"&gt;node1&lt;/a>

推荐答案

通常的方法是将东西塞入您想要保留在会话变量内部的帽子，例如: Session["KeyName"] = theDataToKeepAround;.通常，您希望将视图状态保持尽可能的浅.

TheDataToKeepAround可以是任何东西，包括DataSet，DataTable或自定义数据模型.

由于您使用的是jQuery，因此您可以考虑在浏览器中进行几乎所有操作，并使用 jQuery数据 [ ^ ]将数据附加到您的树-可能还有jQuery.getJSON [

The usual way is to stuff things that you want to keep around inside session variables like: Session["KeyName"] = theDataToKeepAround;. You usually want to keep your viewstate as light as possible.

The theDataToKeepAround kan be just about anything, including a DataSet, DataTable, or a custom data model.

Since you are using jQuery, you could consider doing nearly everything in the browser, and use jQuery Data[^] to attach data to your tree - and possibly jQuery.getJSON[^] to get data from the server. If you move most of your processing to the browser you could avoid the whole issue.

Regards
Espen Harlinn

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