asp.net-mvc 使用 ASP.NET MVC 辅助方法设置 maxlength 和其他 html 属性
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Setting maxlength and other html attributes using ASP.NET MVC helper methods
提问by Kevin Pang
Currently when I want to set html attributes like maxlength and autocomplete, I have to use the following syntax:
目前，当我想设置像 maxlength 和 autocomplete 这样的 html 属性时，我必须使用以下语法：
<%= Html.TextBox("username", ViewData["username"], new { maxlength = 20, autocomplete = "off" }) %>
Is there any way to do this without having to explicitly set the ViewData["username"] portion? In other words, I want to rely on the helper method's automatic loading routine rather than having to explicitly tell it which field to load up from the ViewData.
有没有办法做到这一点而不必显式设置 ViewData["username"] 部分？换句话说，我想依赖辅助方法的自动加载例程，而不是必须明确告诉它从 ViewData 加载哪个字段。
回答by veggerby
Just pass "null" as second parameter:
只需将“null”作为第二个参数传递：
<%= Html.TextBox("username", null, new { maxlength = 20, autocomplete = "off" }) %>
回答by marc.d
yes but you have to use ViewData.Model instead of ViewData.Item()
是的，但你必须使用 ViewData.Model 而不是 ViewData.Item()
the code in your controller should look like this (sry 4 VB.NET code)
控制器中的代码应如下所示（sry 4 VB.NET 代码）
Function Index()
ViewData("Title") = "Home Page"
ViewData("Message") = "Welcome to ASP.NET MVC!"
Dim user As New User
Return View(user)
End Function
now you can do this in the view
现在您可以在视图中执行此操作
<%=Html.TextBox("username", Nothing, New With {.maxlength = 30})%>
note that the user object has a public property username
请注意，用户对象有一个公共属性用户名
hth
第
回答by omoto
I used construction as below:
我使用的构造如下：
<%= Html.TextBox("username", "", new { @maxlength = "20", @autocomplete = "off" }) %>
回答by omoto
For Setting max length of TextBox you can pass "" or null for Second Parameter and set html attributes(maxlength) as third parameter
对于设置 TextBox 的最大长度，您可以为第二个参数传递 "" 或 null 并将 html 属性（maxlength）设置为第三个参数
<%=Html.TextBox("username", "", new { @maxlength = 10 }) %>
