问题
In Html 5, there is a new attribute on textbox called autofocus.
The problem is that it is a boolean value (there or not there)
It should look something like :
<input name="a" value="" autofocus>
I tried :
<%= Html.TextBox( "a", null, new { autofocus } ) %>
But, it gives me an error because I'm not setting a value to autofocus...
I know I can do it manually, but can I do it with Html.TextBox ?
回答1:
Try <%= Html.TextBox( "a", null, new { autofocus = "" } ) %>
According to the HTML5 spec on boolean attributes:
If the attribute is present, its value must either be the empty string or a value that is an ASCII case-insensitive match for the attribute's canonical name, with no leading or trailing whitespace.
So either
<input name="a" value="" autofocus>or<input name="a" value="" autofocus="">or<input name="a" value="" autofocus="autofocus">
should be valid.
回答2:
Also, you can do following along with some other attributes:
@Html.TextBoxFor(m => m.Email, new { @class = "class1", @placeholder = "Email", @autofocus = "autofocus" })
Note: Only issue with autofocus is that, in IE browsers, placeholder text does not get displayed when the input control is in focus (it's an issue with IE).
回答3:
As of XHTML, the standard way to enable such a boolean attribute would be:
<input name="a" value="" autofocus="autofocus" />
therefore, assuming that is still valid in HTML5, you could use the following code:
<%=Html.TextBox( "a", null, new { autofocus: "autofocus" } ) %>
来源：https://stackoverflow.com/questions/2998247/asp-net-mvc-html-textbox-set-autofocus-property