在 ASP.NET 中修改服务器端的 html 输出

Modify html output at server side in ASP.NET(在 ASP.NET 中修改服务器端的 html 输出)

问题描述

第三方的webcontrol生成如下代码来展示自己:

A third-party's webcontrol generates the following code to display itself:

<div id="uwg">
    <input type="checkbox" />
    <div>blah-blah-blah</div>
    <input type="checkbox" />
</div>

可以改成

<div id="uwg">
    <input type="checkbox" disabled checked />
    <div>blah-blah-blah</div>
    <input type="checkbox" disabled checked />
</div>

当我们点击时

<asp:CheckBox id="chk_CheckAll" runat="server" AutoPostBack="true" />

位于同一页面上?

我们需要在服务器端(在 ASP.NET 中)进行.

We need to do it at server side (in ASP.NET).

第三方的控件没有为此提供接口，所以唯一的可能是使用html输出.我应该处理哪个页面事件(如果有)?另外，是否有一些等效于 DOM 模型，或者我需要将输出作为字符串处理?

That third-party's control does not give interface for this, so the only possibility is to work with html output. Which page event should I handle (if any)? Also, is there some equivalent to DOM model, or I need to work with output as string?

推荐答案

当checkbox不在服务端运行或者封装在控件内部时，我们可以使用如下方法:

When checkboxes are not run at server or are encapsulated inside the control, we can use the following method:

protected override void Render(HtmlTextWriter writer)
{
    // setup a TextWriter to capture the markup
    TextWriter tw = new StringWriter();
    HtmlTextWriter htw = new HtmlTextWriter(tw);

    // render the markup into our surrogate TextWriter
    base.Render(htw);

    // get the captured markup as a string
    string pageSource = tw.ToString();

    string enabledUnchecked = "<input type="checkbox" />";
    string disabledChecked = "<input type="checkbox" disabled checked />";

    // TODO: need replacing ONLY inside a div with id="uwg"
    string updatedPageSource = pageSource;
    if (chk_CheckAll.Checked)
    {
         updatedPageSource = Regex.Replace(pageSource, enabledUnchecked,
                disabledChecked, RegexOptions.IgnoreCase);
    }

    // render the markup into the output stream verbatim
    writer.Write(updatedPageSource);
}

解决方案来自这里.

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