asp.net 有条件地禁用标签助手(textarea) [英] asp.net conditionally disable a tag helper (textarea)

问题描述

我想根据从模型评估的条件启用或禁用 textarea，并且我正在使用 textarea 标签助手.换句话说，是这样的:

I want to enable or disable a textarea depending on a condition that evalueates from the model, and I am using the textarea tag helper. In other words, something like this:

<textarea asp-for="Doc" @(Model.MustDisable ? "disabled" : "")></textarea>

但我收到以下设计时错误:标签助手textarea"在元素的属性声明区域中不得包含 C#.

But I got the following design-time error: The tag helper 'textarea' must not have C# in element's attribute declaration area.

然后我尝试了:

<textarea asp-for="Doc" disabled='@(Model.MustDisable ? "disabled" : "")'></textarea>

没有显示任何设计时错误，但呈现如下:Model.MustDisable==true 呈现 disabled='disabled' 并且 Model.MustDisable==false 呈现 disabled.因此文本区域将始终被禁用.

which did not show any design time error but it renders like this: Model.MustDisable==true renders disabled='disabled' AND Model.MustDisable==false renders disabled. So the text area will always be disabled.

然后我尝试(删除's):

Then I tried (removing the 's):

textarea asp-for="Doc" disabled=@(Model.MustDisable ? "disabled" : "")></textarea>

没有显示任何设计时错误，但呈现与前一个相同.

which did not show any design time error but it renders the same as the previous one.

我怎样才能以正确的方式实现这一点?

How can I implement this the right way?

推荐答案

其实很简单，disable 属性已经随心所欲了——你可以传入一个布尔值:

It is actually very simple, the disable attribute is already working as you want - you can pass in a boolean value:

<textarea asp-for="Doc" disabled="@Model.MustDisable"></textarea>

如果为 false，则不呈现 disabled 属性:

if false the disabled attribute is not rendered:

<textarea></textarea>

如果为真，则 disabled 属性设置为disabled":

if true the disabled attribute is set to "disabled":

<textarea disabled="disabled"></textarea>

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