Asp.net checkbox and html data attribute
Solution 1
I'm not sure why it's rendered with a span, but I suppose you can add the attribute directly to the input
element of the CheckBox
in code-behid like this:
myCheckBox.InputAttributes.Add(...)
Reference links:
- http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkbox.inputattributes.aspx
- http://forums.asp.net/p/541142/541562.aspx
- http://msdn.microsoft.com/en-us/library/system.web.ui.attributecollection.add.aspx
Update
An additional parent element is used, so that the attributes you apply to a CheckBox
can affect both the input
and the text. I suppose it's a span
(and not a div
), because it's an inline element, making it more convenient to use in different scenarios.
Reference links:
- http://en.wikipedia.org/wiki/Span_and_div#Differences_and_default_behavior
- http://learnwebdesignonline.com/span-div
Solution 2
This is the way that render engine builds the CheckBox
control, there isn't very much to do about it.
Something you could do is creating a runat="server"
input.
<input id="myInput" runat="server" type="checkbox" data-foo="bar"/>
<label>Custom attribute</label>
Another option is adding the data-foo
attribute using jquery on document load
$(function(){
$('span[data-foo]').each(function(){
var $span = $(this);
var value = $span.data('foo');
$span.find('input').data('foo',value);
});
})
Solution 3
Just to add another method that I use when all else fails, you can always use a literal control and make it render whatever you want. You need to do a bit more work when handling the postback, but sometimes this is the only way to get the html you need.
Markup:
<asp:Literal ID="myLiteral" runat="server"/>
Codebeside:
myLiteral.Text = string.Format("<input type=\"checkbox\" data-foo=\"{0}\" /><label>Normal</label>", value)
Ortiga
Mainly a C# backend developer, currently a contractor at StarCorp. I've previously worked with PHP, and I'm also interested in functional or hybrid languages, like Ruby, F#, Python, Scala and Lisp.
Updated on February 22, 2020Comments
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Ortiga over 4 years
In asp.net, if you use a custom attribute, usually it is rendered as-is.
Considering this markup (note: attributes such as
id
,name
andfor
were removed in all examples as their generated id/names are verbose):<asp:TextBox runat="server" data-foo="bar" />
Is rendered in asp.net as:
<input type="text" data-foo="bar" />
That is, asp.net keeps
data-foo
untouched.Check box are usually rendered like this:
<asp:CheckBox runat="server" Text="Normal" />
Renders as:
<input type="checkbox" /> <label>Normal</label>
But if you add a custom attribute on a checkbox:
<asp:CheckBox runat="server" Text="Custom attribute" data-foo="bar" />
It renders as:
<span data-foo="bar"> <input type="checkbox" /> <label>Custom attribute</label> </span>
As you can see, a span in rendered to hold the attribute. This also happens if you add the attribute in code behind. This does not happen with any other HtmlControl, AFAIK.
Does anyone know why this span is rendered to hold the attribute?
Is there anyway to render the attribute in the input tag?
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Ortiga about 12 yearsNice, I've never noted this InputAttributes before. I tried Attributes.Add, which didn't work.