修改 ASP.NET MVC 2 中的 HTML 帮助程序

发布于 2024-10-12 07:09:42 字数 727 浏览 4 评论 0原文

我想修改像这样的帮助器：

<%= Html.CheckBoxFor(m => m.Current, new { @class = "economicTextBox", propertyName = "Current", onchange = "UseCurrent();UpdateField(this);" })%>

同时将另一个表示应用程序中的权限的字符串作为参数，然后在方法内部我将确定是否返回实际的 HTML 或不返回任何内容，具体取决于他们的权限。

我该怎么做？

更新 2：复选框未呈现为只读

当我调试并检查 htmlHelper.CheckBoxFor(expression, mergedHtmlAttributes)._value 的值时，我得到了这一点，

<input checked="checked" class="economicTextBox" id="Current" name="Current" onchange="UseCurrent();UpdateField(this);" propertyName="Current" readonly="true" type="checkbox" value="true" /><input name="Current" type="hidden" value="false" />

但复选框仍在呈现，允许我更改它并实现完整功能。为什么？

原文

I want to modify helpers such as this one:

<%= Html.CheckBoxFor(m => m.Current, new { @class = "economicTextBox", propertyName = "Current", onchange = "UseCurrent();UpdateField(this);" })%>

to also take as a parameter another string that signifies a permission in the app, and then INSIDE the method I would determine whether or not to return the actual HTML or nothing, depending on their permission.

How would I do this?

UPDATE 2: Checkbox not rendering as readonly

When I debug and check the value of htmlHelper.CheckBoxFor(expression, mergedHtmlAttributes)._value, I get this

<input checked="checked" class="economicTextBox" id="Current" name="Current" onchange="UseCurrent();UpdateField(this);" propertyName="Current" readonly="true" type="checkbox" value="true" /><input name="Current" type="hidden" value="false" />

but the checkbox is still rendering allowing me to change it and achieve full functionality. Why?

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伴随着你 2024-10-19 07:09:42

您可以编写一个自定义帮助程序：

public static MvcHtmlString MyCheckBoxFor<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, bool>> expression, 
    string permission, 
    object htmlAttributes
)
{
    if (permission == "foo bar")
    {
        // the user has the foo bar permission => render the checkbox
        return htmlHelper.CheckBoxFor(expression, htmlAttributes);
    }
    // the user has no permission => render empty string
    return MvcHtmlString.Empty;
}

然后：

<%= Html.CheckBoxFor(
    m => m.Current, 
    "some permission string",
    new {  
        @class = "economicTextBox", 
        propertyName = "Current", 
        onchange = "UseCurrent();UpdateField(this);" 
    }) 
%>

更新：

以下是您可以修改 HTML 帮助程序的方法，以便在用户没有权限时呈现只读复选框而不是空字符串：

public static MvcHtmlString MyCheckBoxFor<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, bool>> expression,
    string permission,
    object htmlAttributes
)
{
    if (permission == "foo bar")
    {
        // the user has the foo bar permission => render the checkbox
        return htmlHelper.CheckBoxFor(expression, htmlAttributes);
    }
    // the user has no permission => render a readonly checkbox
    var mergedHtmlAttributes = new RouteValueDictionary(htmlAttributes);
    mergedHtmlAttributes["readonly"] = "readonly";
    return htmlHelper.CheckBoxFor(expression, mergedHtmlAttributes);
}

You could write a custom helper:

public static MvcHtmlString MyCheckBoxFor<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, bool>> expression, 
    string permission, 
    object htmlAttributes
)
{
    if (permission == "foo bar")
    {
        // the user has the foo bar permission => render the checkbox
        return htmlHelper.CheckBoxFor(expression, htmlAttributes);
    }
    // the user has no permission => render empty string
    return MvcHtmlString.Empty;
}

and then:

<%= Html.CheckBoxFor(
    m => m.Current, 
    "some permission string",
    new {  
        @class = "economicTextBox", 
        propertyName = "Current", 
        onchange = "UseCurrent();UpdateField(this);" 
    }) 
%>

UPDATE:

Here's how you could modify the HTML helper so that it renders a readonly checkbox instead of an empty string if the user has no permissions:

public static MvcHtmlString MyCheckBoxFor<TModel>(
    this HtmlHelper<TModel> htmlHelper,
    Expression<Func<TModel, bool>> expression,
    string permission,
    object htmlAttributes
)
{
    if (permission == "foo bar")
    {
        // the user has the foo bar permission => render the checkbox
        return htmlHelper.CheckBoxFor(expression, htmlAttributes);
    }
    // the user has no permission => render a readonly checkbox
    var mergedHtmlAttributes = new RouteValueDictionary(htmlAttributes);
    mergedHtmlAttributes["readonly"] = "readonly";
    return htmlHelper.CheckBoxFor(expression, mergedHtmlAttributes);
}

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