How to remove span tag from WebControl when rendered

Question

When using an ASP.NET CheckBox (and in out case, inherited from a CheckBox) it renders a span around the checkbox input control, this span control

Answer 1

Found this useful tip:

In Code Behind, use InputAttributes instead of Attributes.

For Example, type this:

chk.InputAttributes.Add("onchange", "updateFields()")

instead of this:

chk.Attributes.Add("onchange", "updateFields()")

or instead of inline declarations:

<asp:CheckBox ID="chk" runat="server" onchange="updateFields()" />

The last two will cause the wrapping span.

Answer 2

I've found that by implementing a constructor like the one below, you can specify the container tag for your control.

public MyCustomControl() : base(HtmlTextWriterTag.Div)
{
}

You can replace the HtmlTextWriterTag with any of the aviable options, such as Div in the example above. The default is Span.

Answer 3

$(document).ready(function() {
  /* remove the relative spam involving inputs disabled */
  $('input[type="checkbox"]').parent('.aspNetDisabled').each(function() {
    var $this = $(this);
    var cssClass = $this.attr('class');
    $this.children('input[type="checkbox"]').addClass(cssClass).unwrap().parent('label[for],span').first().addClass('css-input-disabled');
  });
});

/* CSS Example */
.css-input {
  position: relative;
  display: inline-block;
  margin: 2px 0;
  font-weight: 400;
  cursor: pointer;
}
.css-input input {
  position: absolute;
  opacity: 0;
}
.css-input input:focus + span {
  box-shadow: 0 0 3px rgba(0, 0, 0, 0.25);
}
.css-input input + span {
  position: relative;
  display: inline-block;
  margin-top: -2px;
  margin-right: 3px;
  vertical-align: middle;
}
.css-input input + span:after {
  position: absolute;
  content: "";
}
.css-input-disabled {
  opacity: .5;
  cursor: not-allowed;
}
.css-checkbox {
  margin: 7px 0;
}
.css-checkbox input + span {
  width: 20px;
  height: 20px;
  background-color: #fff;
  border: 1px solid #ffffd;
  -webkit-transition: background-color 0.2s;
  transition: background-color 0.2s;
}
.css-checkbox input + span:after {
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  font-family: "FontAwesome";
  font-size: 10px;
  color: #fff;
  line-height: 18px;
  content: "\f00c";
  text-align: center;
}
.css-checkbox:hover input + span {
  border-color: #ccc;
}
.css-checkbox-primary input:checked + span {
  background-color: #5c90d2;
  border-color: #5c90d2;
}

<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<!-- Generate from asp.net -->
<label for="CheckBox1" id="Label4" class="css-input css-checkbox css-checkbox-primary">
  <span class="aspNetDisabled">
    <input id="CheckBox1" 
           type="checkbox" 
           checked="checked" 
           disabled="disabled">
  </span>
  <span></span>Disabled
</label>