Struct web_sys::PerformanceObserver
source · [−]#[repr(transparent)]pub struct PerformanceObserver { /* private fields */ }
Expand description
The PerformanceObserver
class.
This API requires the following crate features to be activated: PerformanceObserver
Implementations
sourceimpl PerformanceObserver
impl PerformanceObserver
sourceimpl PerformanceObserver
impl PerformanceObserver
sourcepub fn disconnect(&self)
pub fn disconnect(&self)
The disconnect()
method.
This API requires the following crate features to be activated: PerformanceObserver
sourceimpl PerformanceObserver
impl PerformanceObserver
sourcepub fn observe(&self, options: &PerformanceObserverInit)
pub fn observe(&self, options: &PerformanceObserverInit)
The observe()
method.
This API requires the following crate features to be activated: PerformanceObserver
, PerformanceObserverInit
sourceimpl PerformanceObserver
impl PerformanceObserver
sourcepub fn take_records(&self) -> Array
pub fn take_records(&self) -> Array
The takeRecords()
method.
This API requires the following crate features to be activated: PerformanceObserver
Methods from Deref<Target = Object>
sourcepub fn constructor(&self) -> Function
pub fn constructor(&self) -> Function
The constructor property returns a reference to the Object
constructor
function that created the instance object.
sourcepub fn has_own_property(&self, property: &JsValue) -> bool
pub fn has_own_property(&self, property: &JsValue) -> bool
The hasOwnProperty()
method returns a boolean indicating whether the
object has the specified property as its own property (as opposed to
inheriting it).
sourcepub fn is_prototype_of(&self, value: &JsValue) -> bool
pub fn is_prototype_of(&self, value: &JsValue) -> bool
The isPrototypeOf()
method checks if an object exists in another
object’s prototype chain.
sourcepub fn property_is_enumerable(&self, property: &JsValue) -> bool
pub fn property_is_enumerable(&self, property: &JsValue) -> bool
The propertyIsEnumerable()
method returns a Boolean indicating
whether the specified property is enumerable.
sourcepub fn to_locale_string(&self) -> JsString
pub fn to_locale_string(&self) -> JsString
The toLocaleString()
method returns a string representing the object.
This method is meant to be overridden by derived objects for
locale-specific purposes.
Methods from Deref<Target = JsValue>
pub const NULL: JsValue = JsValue{ idx: JSIDX_NULL, _marker: marker::PhantomData,}
pub const UNDEFINED: JsValue = JsValue{ idx: JSIDX_UNDEFINED, _marker: marker::PhantomData,}
pub const TRUE: JsValue = JsValue{ idx: JSIDX_TRUE, _marker: marker::PhantomData,}
pub const FALSE: JsValue = JsValue{ idx: JSIDX_FALSE, _marker: marker::PhantomData,}
sourcepub fn as_f64(&self) -> Option<f64>
pub fn as_f64(&self) -> Option<f64>
Returns the f64
value of this JS value if it’s an instance of a
number.
If this JS value is not an instance of a number then this returns
None
.
sourcepub fn as_string(&self) -> Option<String>
pub fn as_string(&self) -> Option<String>
If this JS value is a string value, this function copies the JS string
value into wasm linear memory, encoded as UTF-8, and returns it as a
Rust String
.
To avoid the copying and re-encoding, consider the
JsString::try_from()
function from js-sys
instead.
If this JS value is not an instance of a string or if it’s not valid
utf-8 then this returns None
.
UTF-16 vs UTF-8
JavaScript strings in general are encoded as UTF-16, but Rust strings
are encoded as UTF-8. This can cause the Rust string to look a bit
different than the JS string sometimes. For more details see the
documentation about the str
type which contains a few
caveats about the encodings.
sourcepub fn as_bool(&self) -> Option<bool>
pub fn as_bool(&self) -> Option<bool>
Returns the bool
value of this JS value if it’s an instance of a
boolean.
If this JS value is not an instance of a boolean then this returns
None
.
sourcepub fn is_undefined(&self) -> bool
pub fn is_undefined(&self) -> bool
Tests whether this JS value is undefined
sourcepub fn is_function(&self) -> bool
pub fn is_function(&self) -> bool
Tests whether the type of this JS value is function
.
sourcepub fn js_in(&self, obj: &JsValue) -> bool
pub fn js_in(&self, obj: &JsValue) -> bool
Applies the binary in
JS operator on the two JsValue
s.
sourcepub fn loose_eq(&self, other: &JsValue) -> bool
pub fn loose_eq(&self, other: &JsValue) -> bool
Compare two JsValue
s for equality, using the ==
operator in JS.
sourcepub fn unsigned_shr(&self, rhs: &JsValue) -> u32
pub fn unsigned_shr(&self, rhs: &JsValue) -> u32
Applies the binary >>>
JS operator on the two JsValue
s.
sourcepub fn checked_div(&self, rhs: &JsValue) -> JsValue
pub fn checked_div(&self, rhs: &JsValue) -> JsValue
Applies the binary /
JS operator on two JsValue
s, catching and returning any RangeError
thrown.
sourcepub fn pow(&self, rhs: &JsValue) -> JsValue
pub fn pow(&self, rhs: &JsValue) -> JsValue
Applies the binary **
JS operator on the two JsValue
s.
sourcepub fn lt(&self, other: &JsValue) -> bool
pub fn lt(&self, other: &JsValue) -> bool
Applies the binary <
JS operator on the two JsValue
s.
sourcepub fn le(&self, other: &JsValue) -> bool
pub fn le(&self, other: &JsValue) -> bool
Applies the binary <=
JS operator on the two JsValue
s.
sourcepub fn ge(&self, other: &JsValue) -> bool
pub fn ge(&self, other: &JsValue) -> bool
Applies the binary >=
JS operator on the two JsValue
s.
sourcepub fn gt(&self, other: &JsValue) -> bool
pub fn gt(&self, other: &JsValue) -> bool
Applies the binary >
JS operator on the two JsValue
s.
sourcepub fn unchecked_into_f64(&self) -> f64
pub fn unchecked_into_f64(&self) -> f64
Applies the unary +
JS operator on a JsValue
. Can throw.
Trait Implementations
sourceimpl AsRef<JsValue> for PerformanceObserver
impl AsRef<JsValue> for PerformanceObserver
sourceimpl AsRef<Object> for PerformanceObserver
impl AsRef<Object> for PerformanceObserver
sourceimpl AsRef<PerformanceObserver> for PerformanceObserver
impl AsRef<PerformanceObserver> for PerformanceObserver
sourcefn as_ref(&self) -> &PerformanceObserver
fn as_ref(&self) -> &PerformanceObserver
Converts this type into a shared reference of the (usually inferred) input type.
sourceimpl Clone for PerformanceObserver
impl Clone for PerformanceObserver
sourcefn clone(&self) -> PerformanceObserver
fn clone(&self) -> PerformanceObserver
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for PerformanceObserver
impl Debug for PerformanceObserver
sourceimpl Deref for PerformanceObserver
impl Deref for PerformanceObserver
sourceimpl From<JsValue> for PerformanceObserver
impl From<JsValue> for PerformanceObserver
sourcefn from(obj: JsValue) -> PerformanceObserver
fn from(obj: JsValue) -> PerformanceObserver
Converts to this type from the input type.
sourceimpl From<PerformanceObserver> for JsValue
impl From<PerformanceObserver> for JsValue
sourcefn from(obj: PerformanceObserver) -> JsValue
fn from(obj: PerformanceObserver) -> JsValue
Converts to this type from the input type.
sourceimpl From<PerformanceObserver> for Object
impl From<PerformanceObserver> for Object
sourcefn from(obj: PerformanceObserver) -> Object
fn from(obj: PerformanceObserver) -> Object
Converts to this type from the input type.
sourceimpl FromWasmAbi for PerformanceObserver
impl FromWasmAbi for PerformanceObserver
sourceimpl<'a> IntoWasmAbi for &'a PerformanceObserver
impl<'a> IntoWasmAbi for &'a PerformanceObserver
sourceimpl IntoWasmAbi for PerformanceObserver
impl IntoWasmAbi for PerformanceObserver
sourceimpl JsCast for PerformanceObserver
impl JsCast for PerformanceObserver
sourcefn instanceof(val: &JsValue) -> bool
fn instanceof(val: &JsValue) -> bool
Performs a dynamic instanceof
check to see whether the JsValue
provided is an instance of this type. Read more
sourcefn unchecked_from_js(val: JsValue) -> Self
fn unchecked_from_js(val: JsValue) -> Self
Performs a zero-cost unchecked conversion from a JsValue
into an
instance of Self
Read more
sourcefn unchecked_from_js_ref(val: &JsValue) -> &Self
fn unchecked_from_js_ref(val: &JsValue) -> &Self
Performs a zero-cost unchecked conversion from a &JsValue
into an
instance of &Self
. Read more
sourcefn has_type<T>(&self) -> boolwhere
T: JsCast,
fn has_type<T>(&self) -> boolwhere
T: JsCast,
Test whether this JS value has a type T
. Read more
sourcefn dyn_into<T>(self) -> Result<T, Self>where
T: JsCast,
fn dyn_into<T>(self) -> Result<T, Self>where
T: JsCast,
Performs a dynamic cast (checked at runtime) of this value into the
target type T
. Read more
sourcefn dyn_ref<T>(&self) -> Option<&T>where
T: JsCast,
fn dyn_ref<T>(&self) -> Option<&T>where
T: JsCast,
Performs a dynamic cast (checked at runtime) of this value into the
target type T
. Read more
sourcefn unchecked_into<T>(self) -> Twhere
T: JsCast,
fn unchecked_into<T>(self) -> Twhere
T: JsCast,
Performs a zero-cost unchecked cast into the specified type. Read more
sourcefn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
fn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
Performs a zero-cost unchecked cast into a reference to the specified type. Read more
sourcefn is_instance_of<T>(&self) -> boolwhere
T: JsCast,
fn is_instance_of<T>(&self) -> boolwhere
T: JsCast,
Test whether this JS value is an instance of the type T
. Read more
sourcefn is_type_of(val: &JsValue) -> bool
fn is_type_of(val: &JsValue) -> bool
Performs a dynamic check to see whether the JsValue
provided
is a value of this type. Read more
sourceimpl<'a> OptionIntoWasmAbi for &'a PerformanceObserver
impl<'a> OptionIntoWasmAbi for &'a PerformanceObserver
sourceimpl PartialEq<PerformanceObserver> for PerformanceObserver
impl PartialEq<PerformanceObserver> for PerformanceObserver
sourcefn eq(&self, other: &PerformanceObserver) -> bool
fn eq(&self, other: &PerformanceObserver) -> bool
This method tests for self
and other
values to be equal, and is used
by ==
. Read more
sourceimpl RefFromWasmAbi for PerformanceObserver
impl RefFromWasmAbi for PerformanceObserver
type Abi = <JsValue as RefFromWasmAbi>::Abi
type Abi = <JsValue as RefFromWasmAbi>::Abi
The wasm ABI type references to Self
are recovered from.
type Anchor = ManuallyDrop<PerformanceObserver>
type Anchor = ManuallyDrop<PerformanceObserver>
The type that holds the reference to Self
for the duration of the
invocation of the function that has an &Self
parameter. This is
required to ensure that the lifetimes don’t persist beyond one function
call, and so that they remain anonymous. Read more
sourceunsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor
unsafe fn ref_from_abi(js: Self::Abi) -> Self::Anchor
Recover a Self::Anchor
from Self::Abi
. Read more
sourceimpl WasmDescribe for PerformanceObserver
impl WasmDescribe for PerformanceObserver
impl Eq for PerformanceObserver
impl StructuralEq for PerformanceObserver
impl StructuralPartialEq for PerformanceObserver
Auto Trait Implementations
impl RefUnwindSafe for PerformanceObserver
impl !Send for PerformanceObserver
impl !Sync for PerformanceObserver
impl Unpin for PerformanceObserver
impl UnwindSafe for PerformanceObserver
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<T> ReturnWasmAbi for Twhere
T: IntoWasmAbi,
impl<T> ReturnWasmAbi for Twhere
T: IntoWasmAbi,
type Abi = <T as IntoWasmAbi>::Abi
type Abi = <T as IntoWasmAbi>::Abi
Same as IntoWasmAbi::Abi
sourcefn return_abi(self) -> <T as ReturnWasmAbi>::Abi
fn return_abi(self) -> <T as ReturnWasmAbi>::Abi
Same as IntoWasmAbi::into_abi
, except that it may throw and never
return in the case of Err
. Read more