CSSStyleDeclaration class
The CSSStyleDeclaration interface represents an object that is a CSS declaration block, and exposes style information and various style-related methods and properties.
A CSSStyleDeclaration object can be exposed using three different APIs:
- Via HTMLElement.style, which deals with the inline styles of a single
element (e.g., ).
- Via the CSSStyleSheet API. For example,
document.styleSheets
0.cssRules0.style returns a CSSStyleDeclaration object on the first CSS rule in the document's first stylesheet. - Via
Window.getComputedStyle(), which exposes the CSSStyleDeclaration object as a read-only interface.
Constructors
- CSSStyleDeclaration()
-
CSSStyleDeclaration.computedStyle(Element? target, Map<
String, dynamic> ? defaultStyle, StyleChangeListener? onStyleChanged)
Properties
- cssText → String
-
Textual representation of the declaration block.
Setting this attribute changes the style.
no setter
-
defaultStyle
↔ Map<
String, dynamic> ? -
getter/setter pair
- hashCode → int
-
The hash code for this object.
no setterinherited
- length → int
-
The number of properties.
no setter
- onStyleChanged ↔ StyleChangeListener?
-
getter/setter pair
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
- target ↔ Element?
-
getter/setter pair
Methods
-
addStyleChangeListener(
StyleChangeListener listener) → void -
contains(
String property) → bool - Check a css property is valid.
-
diff(
CSSStyleDeclaration other) → Map< String, String?> -
dispose(
) → void -
flushPendingProperties(
) → void -
getPropertyValue(
String propertyName) → String - Returns the property value given a property name. value is a String containing the value of the property. If not set, returns the empty string.
-
item(
int index) → String - Returns a property name.
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
removeProperty(
String propertyName, [bool? isImportant]) → void - Removes a property from the CSS declaration.
-
removeStyleChangeListener(
StyleChangeListener listener) → void -
reset(
) → void -
setProperty(
String propertyName, String? value, [bool? isImportant]) → void - Modifies an existing CSS property or creates a new CSS property in the declaration block.
-
toString(
) → String -
A string representation of this object.
override
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
-
operator [](
String property) → dynamic - Override [] and []= operator to get/set style properties.
-
operator []=(
String property, dynamic value) → void
Static Properties
- empty ↔ CSSStyleDeclaration
-
An empty style declaration.
getter/setter pair
Static Methods
-
isNullOrEmptyValue(
dynamic value) → bool