CSSRuleList extension type
A CSSRuleList represents an ordered collection of read-only CSSRule
objects.
While the CSSRuleList object is read-only, and cannot be directly
modified, it is considered a live object, as the content can change over
time.
To edit the underlying rules returned by CSSRule objects, use
CSSStyleSheet.insertRule and CSSStyleSheet.deleteRule, which are methods
of CSSStyleSheet.
This interface was an attempt to create an unmodifiable list and only continues to be supported to not break code that's already using it. Modern APIs represent list structures using types based on JavaScript arrays, thus making many array methods available, and at the same time imposing additional semantics on their usage (such as making their items read-only).
These historical reasons do not mean that you as a developer should avoid
CSSRuleList. You don't create CSSRuleList objects yourself, but you get
them from APIs such as CSSStyleSheet.cssRules and
CSSKeyframesRule.cssRules, and these APIs are not deprecated. However, be
careful of the semantic differences from a real array.
API documentation sourced from MDN Web Docs.
- on
- Implemented types
- Available extensions
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- length → int
-
The
lengthproperty of the CSSRuleList interface returns the number of CSSRule objects in the list.no setter - runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
item(
int index) → CSSRule? -
The
item()method of the CSSRuleList interface returns the CSSRule object at the specifiedindexornullif the specifiedindexdoesn't exist. -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited