I'd like to write a simple jQuery plugin that displays inline modals under specified elements. My idea is for the script to auto-init based on data attributes specified on elements.
A very basic example:
<p data-modal-target>Hover over me for an inline modal!</p>
<div data-modal-content data-modal-align="right" data-modal-trigger="hover" data-modal-offset="10px"><!-- any desired syntax can go here --></div>
I'm just wondering if data-modal-target in the above example is valid, or does it have to be data-modal-target="true"? I don't care about anything crappier than IE9 etc, my only requirement is that it be valid HTML5.
Yes, perfectly valid. In your case, data-modal-target would represent a boolean attribute:
2.4.2 Boolean attributes
The presence of a boolean attribute on an element represents the true value, and the absence of the attribute represents the false value.
Custom data attributes specification doesn't mention any changes to empty attributes handling, so general rules about empty attributes apply here:
Certain attributes may be specified by providing just the attribute name, with no value.
In the following example, the
disabledattribute is given with the empty attribute syntax:<input disabled>Note that empty attribute syntax is exactly equivalent to specifying the empty string as the value for the attribute, as in the following example.
<input disabled="">
So you are allowed to use empty custom data attributes, but special handling needed to use them as boolean.
If you are accessing attribute through element.dataset:
- When an empty attribute is present, it's value is
"". - When an attribute is absent, you are getting
undefined.
Therefore, you can't just check as if (element.dataset.myattr) because it will always be false.
You can and should check boolean attributes as if (element.dataset.myattr !== undefined).
Lloyd's answer is incorrect. He mentions link to boolean attributes microsyntax, but data-* attributes are not specified as boolean in spec.
Yes, it is valid syntax to omit value for a custom data attribute.
"Attributes can be specified in four different ways:
Empty attribute syntax Just the attribute name. The value is implicitly the empty string. [...]" https://developers.whatwg.org/syntax.html#attributes-0
On one hand, it passes the validator 16.5.7 https://validator.w3.org/nu/#textarea :
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8"/>
<title>a</title>
</head>
<body data-asdf>
</body>
</html>
On the other, HTML5 does not say in the specification of data- attributes that they are boolean: https://www.w3.org/TR/html5/dom.html#custom-data-attribute while it says that very clearly for other boolean attributes like checked https://www.w3.org/TR/html5/forms.html#attr-input-checked
来源：https://stackoverflow.com/questions/9729080/are-empty-html5-data-attributes-valid