pub struct JsValue { /* private fields */ }
dep_web_sys
only.Expand description
Representation of an object owned by JS.
A JsValue
doesn’t actually live in Rust right now but actually in a table
owned by the wasm-bindgen
generated JS glue code. Eventually the ownership
will transfer into Wasm directly and this will likely become more efficient,
but for now it may be slightly slow.
Implementations§
Source§impl JsValue
impl JsValue
Sourcepub const UNDEFINED: JsValue
Available on crate feature dep_js_sys
only.
pub const UNDEFINED: JsValue
dep_js_sys
only.The undefined
JS value constant.
Sourcepub const FALSE: JsValue
Available on crate feature dep_js_sys
only.
pub const FALSE: JsValue
dep_js_sys
only.The false
JS value constant.
Sourcepub fn from_str(s: &str) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn from_str(s: &str) -> JsValue
dep_js_sys
only.Creates a new JS value which is a string.
The utf-8 string provided is copied to the JS heap and the string will be owned by the JS garbage collector.
Sourcepub fn from_f64(n: f64) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn from_f64(n: f64) -> JsValue
dep_js_sys
only.Creates a new JS value which is a number.
This function creates a JS value representing a number (a heap allocated number) and returns a handle to the JS version of it.
Sourcepub fn bigint_from_str(s: &str) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn bigint_from_str(s: &str) -> JsValue
dep_js_sys
only.Creates a new JS value which is a bigint from a string representing a number.
This function creates a JS value representing a bigint (a heap allocated large integer) and returns a handle to the JS version of it.
Sourcepub const fn from_bool(b: bool) -> JsValue
Available on crate feature dep_js_sys
only.
pub const fn from_bool(b: bool) -> JsValue
dep_js_sys
only.Creates a new JS value which is a boolean.
This function creates a JS object representing a boolean (a heap allocated boolean) and returns a handle to the JS version of it.
Sourcepub const fn undefined() -> JsValue
Available on crate feature dep_js_sys
only.
pub const fn undefined() -> JsValue
dep_js_sys
only.Creates a new JS value representing undefined
.
Sourcepub const fn null() -> JsValue
Available on crate feature dep_js_sys
only.
pub const fn null() -> JsValue
dep_js_sys
only.Creates a new JS value representing null
.
Sourcepub fn symbol(description: Option<&str>) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn symbol(description: Option<&str>) -> JsValue
dep_js_sys
only.Creates a new JS symbol with the optional description specified.
This function will invoke the Symbol
constructor in JS and return the
JS object corresponding to the symbol created.
Sourcepub fn as_f64(&self) -> Option<f64> ⓘ
Available on crate feature dep_js_sys
only.
pub fn as_f64(&self) -> Option<f64> ⓘ
dep_js_sys
only.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 is_string(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_string(&self) -> bool
dep_js_sys
only.Tests whether this JS value is a JS string.
Sourcepub fn as_string(&self) -> Option<String> ⓘ
Available on crate feature dep_js_sys
only.
pub fn as_string(&self) -> Option<String> ⓘ
dep_js_sys
only.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> ⓘ
Available on crate feature dep_js_sys
only.
pub fn as_bool(&self) -> Option<bool> ⓘ
dep_js_sys
only.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_null(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_null(&self) -> bool
dep_js_sys
only.Tests whether this JS value is null
Sourcepub fn is_undefined(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_undefined(&self) -> bool
dep_js_sys
only.Tests whether this JS value is undefined
Sourcepub fn is_symbol(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_symbol(&self) -> bool
dep_js_sys
only.Tests whether the type of this JS value is symbol
Sourcepub fn is_object(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_object(&self) -> bool
dep_js_sys
only.Tests whether typeof self == "object" && self !== null
.
Sourcepub fn is_array(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_array(&self) -> bool
dep_js_sys
only.Tests whether this JS value is an instance of Array.
Sourcepub fn is_function(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_function(&self) -> bool
dep_js_sys
only.Tests whether the type of this JS value is function
.
Sourcepub fn is_bigint(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_bigint(&self) -> bool
dep_js_sys
only.Tests whether the type of this JS value is bigint
.
Sourcepub fn js_typeof(&self) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn js_typeof(&self) -> JsValue
dep_js_sys
only.Applies the unary typeof
JS operator on a JsValue
.
Sourcepub fn js_in(&self, obj: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn js_in(&self, obj: &JsValue) -> bool
dep_js_sys
only.Applies the binary in
JS operator on the two JsValue
s.
Sourcepub fn is_truthy(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_truthy(&self) -> bool
dep_js_sys
only.Tests whether the value is “truthy”.
Sourcepub fn is_falsy(&self) -> bool
Available on crate feature dep_js_sys
only.
pub fn is_falsy(&self) -> bool
dep_js_sys
only.Tests whether the value is “falsy”.
Sourcepub fn loose_eq(&self, other: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn loose_eq(&self, other: &JsValue) -> bool
dep_js_sys
only.Compare two JsValue
s for equality, using the ==
operator in JS.
Sourcepub fn bit_not(&self) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn bit_not(&self) -> JsValue
dep_js_sys
only.Applies the unary ~
JS operator on a JsValue
.
Sourcepub fn unsigned_shr(&self, rhs: &JsValue) -> u32 ⓘ
Available on crate feature dep_js_sys
only.
pub fn unsigned_shr(&self, rhs: &JsValue) -> u32 ⓘ
dep_js_sys
only.Applies the binary >>>
JS operator on the two JsValue
s.
Sourcepub fn checked_div(&self, rhs: &JsValue) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn checked_div(&self, rhs: &JsValue) -> JsValue
dep_js_sys
only.Applies the binary /
JS operator on two JsValue
s, catching and returning any RangeError
thrown.
Sourcepub fn pow(&self, rhs: &JsValue) -> JsValue
Available on crate feature dep_js_sys
only.
pub fn pow(&self, rhs: &JsValue) -> JsValue
dep_js_sys
only.Applies the binary **
JS operator on the two JsValue
s.
Sourcepub fn lt(&self, other: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn lt(&self, other: &JsValue) -> bool
dep_js_sys
only.Applies the binary <
JS operator on the two JsValue
s.
Sourcepub fn le(&self, other: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn le(&self, other: &JsValue) -> bool
dep_js_sys
only.Applies the binary <=
JS operator on the two JsValue
s.
Sourcepub fn ge(&self, other: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn ge(&self, other: &JsValue) -> bool
dep_js_sys
only.Applies the binary >=
JS operator on the two JsValue
s.
Sourcepub fn gt(&self, other: &JsValue) -> bool
Available on crate feature dep_js_sys
only.
pub fn gt(&self, other: &JsValue) -> bool
dep_js_sys
only.Applies the binary >
JS operator on the two JsValue
s.
Sourcepub fn unchecked_into_f64(&self) -> f64 ⓘ
Available on crate feature dep_js_sys
only.
pub fn unchecked_into_f64(&self) -> f64 ⓘ
dep_js_sys
only.Applies the unary +
JS operator on a JsValue
. Can throw.
Trait Implementations§
Source§impl AsRef<JsValue> for ArrayBuffer
impl AsRef<JsValue> for ArrayBuffer
Source§impl AsRef<JsValue> for AsyncIterator
impl AsRef<JsValue> for AsyncIterator
Source§impl AsRef<JsValue> for BigInt64Array
impl AsRef<JsValue> for BigInt64Array
Source§impl AsRef<JsValue> for BigUint64Array
impl AsRef<JsValue> for BigUint64Array
Source§impl AsRef<JsValue> for CompileError
impl AsRef<JsValue> for CompileError
Source§impl AsRef<JsValue> for DateTimeFormat
impl AsRef<JsValue> for DateTimeFormat
Source§impl AsRef<JsValue> for Float32Array
impl AsRef<JsValue> for Float32Array
Source§impl AsRef<JsValue> for Float64Array
impl AsRef<JsValue> for Float64Array
Source§impl AsRef<JsValue> for Int16Array
impl AsRef<JsValue> for Int16Array
Source§impl AsRef<JsValue> for Int32Array
impl AsRef<JsValue> for Int32Array
Source§impl AsRef<JsValue> for IteratorNext
impl AsRef<JsValue> for IteratorNext
Source§impl AsRef<JsValue> for NumberFormat
impl AsRef<JsValue> for NumberFormat
Source§impl AsRef<JsValue> for PluralRules
impl AsRef<JsValue> for PluralRules
Source§impl AsRef<JsValue> for RangeError
impl AsRef<JsValue> for RangeError
Source§impl AsRef<JsValue> for ReferenceError
impl AsRef<JsValue> for ReferenceError
Source§impl AsRef<JsValue> for RelativeTimeFormat
impl AsRef<JsValue> for RelativeTimeFormat
Source§impl AsRef<JsValue> for RuntimeError
impl AsRef<JsValue> for RuntimeError
Source§impl AsRef<JsValue> for SyntaxError
impl AsRef<JsValue> for SyntaxError
Source§impl AsRef<JsValue> for Uint16Array
impl AsRef<JsValue> for Uint16Array
Source§impl AsRef<JsValue> for Uint32Array
impl AsRef<JsValue> for Uint32Array
Source§impl AsRef<JsValue> for Uint8Array
impl AsRef<JsValue> for Uint8Array
Source§impl AsRef<JsValue> for Uint8ClampedArray
impl AsRef<JsValue> for Uint8ClampedArray
Source§impl From<ArrayBuffer> for JsValue
impl From<ArrayBuffer> for JsValue
Source§fn from(obj: ArrayBuffer) -> JsValue
fn from(obj: ArrayBuffer) -> JsValue
Source§impl From<AsyncIterator> for JsValue
impl From<AsyncIterator> for JsValue
Source§fn from(obj: AsyncIterator) -> JsValue
fn from(obj: AsyncIterator) -> JsValue
Source§impl From<BigInt64Array> for JsValue
impl From<BigInt64Array> for JsValue
Source§fn from(obj: BigInt64Array) -> JsValue
fn from(obj: BigInt64Array) -> JsValue
Source§impl From<BigUint64Array> for JsValue
impl From<BigUint64Array> for JsValue
Source§fn from(obj: BigUint64Array) -> JsValue
fn from(obj: BigUint64Array) -> JsValue
Source§impl From<CompileError> for JsValue
impl From<CompileError> for JsValue
Source§fn from(obj: CompileError) -> JsValue
fn from(obj: CompileError) -> JsValue
Source§impl From<DateTimeFormat> for JsValue
impl From<DateTimeFormat> for JsValue
Source§fn from(obj: DateTimeFormat) -> JsValue
fn from(obj: DateTimeFormat) -> JsValue
Source§impl From<Float32Array> for JsValue
impl From<Float32Array> for JsValue
Source§fn from(obj: Float32Array) -> JsValue
fn from(obj: Float32Array) -> JsValue
Source§impl From<Float64Array> for JsValue
impl From<Float64Array> for JsValue
Source§fn from(obj: Float64Array) -> JsValue
fn from(obj: Float64Array) -> JsValue
Source§impl From<Int16Array> for JsValue
impl From<Int16Array> for JsValue
Source§fn from(obj: Int16Array) -> JsValue
fn from(obj: Int16Array) -> JsValue
Source§impl From<Int32Array> for JsValue
impl From<Int32Array> for JsValue
Source§fn from(obj: Int32Array) -> JsValue
fn from(obj: Int32Array) -> JsValue
Source§impl From<IteratorNext> for JsValue
impl From<IteratorNext> for JsValue
Source§fn from(obj: IteratorNext) -> JsValue
fn from(obj: IteratorNext) -> JsValue
Source§impl From<JsValue> for ArrayBuffer
impl From<JsValue> for ArrayBuffer
Source§fn from(obj: JsValue) -> ArrayBuffer
fn from(obj: JsValue) -> ArrayBuffer
Source§impl From<JsValue> for AsyncIterator
impl From<JsValue> for AsyncIterator
Source§fn from(obj: JsValue) -> AsyncIterator
fn from(obj: JsValue) -> AsyncIterator
Source§impl From<JsValue> for BigInt64Array
impl From<JsValue> for BigInt64Array
Source§fn from(obj: JsValue) -> BigInt64Array
fn from(obj: JsValue) -> BigInt64Array
Source§impl From<JsValue> for BigUint64Array
impl From<JsValue> for BigUint64Array
Source§fn from(obj: JsValue) -> BigUint64Array
fn from(obj: JsValue) -> BigUint64Array
Source§impl From<JsValue> for CompileError
impl From<JsValue> for CompileError
Source§fn from(obj: JsValue) -> CompileError
fn from(obj: JsValue) -> CompileError
Source§impl From<JsValue> for DateTimeFormat
impl From<JsValue> for DateTimeFormat
Source§fn from(obj: JsValue) -> DateTimeFormat
fn from(obj: JsValue) -> DateTimeFormat
Source§impl From<JsValue> for Float32Array
impl From<JsValue> for Float32Array
Source§fn from(obj: JsValue) -> Float32Array
fn from(obj: JsValue) -> Float32Array
Source§impl From<JsValue> for Float64Array
impl From<JsValue> for Float64Array
Source§fn from(obj: JsValue) -> Float64Array
fn from(obj: JsValue) -> Float64Array
Source§impl From<JsValue> for Int16Array
impl From<JsValue> for Int16Array
Source§fn from(obj: JsValue) -> Int16Array
fn from(obj: JsValue) -> Int16Array
Source§impl From<JsValue> for Int32Array
impl From<JsValue> for Int32Array
Source§fn from(obj: JsValue) -> Int32Array
fn from(obj: JsValue) -> Int32Array
Source§impl From<JsValue> for IteratorNext
impl From<JsValue> for IteratorNext
Source§fn from(obj: JsValue) -> IteratorNext
fn from(obj: JsValue) -> IteratorNext
Source§impl From<JsValue> for NumberFormat
impl From<JsValue> for NumberFormat
Source§fn from(obj: JsValue) -> NumberFormat
fn from(obj: JsValue) -> NumberFormat
Source§impl From<JsValue> for PluralRules
impl From<JsValue> for PluralRules
Source§fn from(obj: JsValue) -> PluralRules
fn from(obj: JsValue) -> PluralRules
Source§impl From<JsValue> for RangeError
impl From<JsValue> for RangeError
Source§fn from(obj: JsValue) -> RangeError
fn from(obj: JsValue) -> RangeError
Source§impl From<JsValue> for ReferenceError
impl From<JsValue> for ReferenceError
Source§fn from(obj: JsValue) -> ReferenceError
fn from(obj: JsValue) -> ReferenceError
Source§impl From<JsValue> for RelativeTimeFormat
impl From<JsValue> for RelativeTimeFormat
Source§fn from(obj: JsValue) -> RelativeTimeFormat
fn from(obj: JsValue) -> RelativeTimeFormat
Source§impl From<JsValue> for RuntimeError
impl From<JsValue> for RuntimeError
Source§fn from(obj: JsValue) -> RuntimeError
fn from(obj: JsValue) -> RuntimeError
Source§fn from(obj: JsValue) -> SharedArrayBuffer
fn from(obj: JsValue) -> SharedArrayBuffer
Source§impl From<JsValue> for SyntaxError
impl From<JsValue> for SyntaxError
Source§fn from(obj: JsValue) -> SyntaxError
fn from(obj: JsValue) -> SyntaxError
Source§impl From<JsValue> for Uint16Array
impl From<JsValue> for Uint16Array
Source§fn from(obj: JsValue) -> Uint16Array
fn from(obj: JsValue) -> Uint16Array
Source§impl From<JsValue> for Uint32Array
impl From<JsValue> for Uint32Array
Source§fn from(obj: JsValue) -> Uint32Array
fn from(obj: JsValue) -> Uint32Array
Source§impl From<JsValue> for Uint8Array
impl From<JsValue> for Uint8Array
Source§fn from(obj: JsValue) -> Uint8Array
fn from(obj: JsValue) -> Uint8Array
Source§impl From<JsValue> for Uint8ClampedArray
impl From<JsValue> for Uint8ClampedArray
Source§fn from(obj: JsValue) -> Uint8ClampedArray
fn from(obj: JsValue) -> Uint8ClampedArray
Source§impl From<NumberFormat> for JsValue
impl From<NumberFormat> for JsValue
Source§fn from(obj: NumberFormat) -> JsValue
fn from(obj: NumberFormat) -> JsValue
Source§impl From<PluralRules> for JsValue
impl From<PluralRules> for JsValue
Source§fn from(obj: PluralRules) -> JsValue
fn from(obj: PluralRules) -> JsValue
Source§impl From<RangeError> for JsValue
impl From<RangeError> for JsValue
Source§fn from(obj: RangeError) -> JsValue
fn from(obj: RangeError) -> JsValue
Source§impl From<ReferenceError> for JsValue
impl From<ReferenceError> for JsValue
Source§fn from(obj: ReferenceError) -> JsValue
fn from(obj: ReferenceError) -> JsValue
Source§impl From<RelativeTimeFormat> for JsValue
impl From<RelativeTimeFormat> for JsValue
Source§fn from(obj: RelativeTimeFormat) -> JsValue
fn from(obj: RelativeTimeFormat) -> JsValue
Source§impl From<RuntimeError> for JsValue
impl From<RuntimeError> for JsValue
Source§fn from(obj: RuntimeError) -> JsValue
fn from(obj: RuntimeError) -> JsValue
Source§fn from(obj: SharedArrayBuffer) -> JsValue
fn from(obj: SharedArrayBuffer) -> JsValue
Source§impl From<SyntaxError> for JsValue
impl From<SyntaxError> for JsValue
Source§fn from(obj: SyntaxError) -> JsValue
fn from(obj: SyntaxError) -> JsValue
Source§impl From<Uint16Array> for JsValue
impl From<Uint16Array> for JsValue
Source§fn from(obj: Uint16Array) -> JsValue
fn from(obj: Uint16Array) -> JsValue
Source§impl From<Uint32Array> for JsValue
impl From<Uint32Array> for JsValue
Source§fn from(obj: Uint32Array) -> JsValue
fn from(obj: Uint32Array) -> JsValue
Source§impl From<Uint8Array> for JsValue
impl From<Uint8Array> for JsValue
Source§fn from(obj: Uint8Array) -> JsValue
fn from(obj: Uint8Array) -> JsValue
Source§impl From<Uint8ClampedArray> for JsValue
impl From<Uint8ClampedArray> for JsValue
Source§fn from(obj: Uint8ClampedArray) -> JsValue
fn from(obj: Uint8ClampedArray) -> JsValue
Source§impl FromWasmAbi for JsValue
impl FromWasmAbi for JsValue
Source§impl IntoWasmAbi for &JsValue
impl IntoWasmAbi for &JsValue
Source§impl IntoWasmAbi for JsValue
impl IntoWasmAbi for JsValue
Source§impl JsCast for JsValue
impl JsCast for JsValue
Source§fn instanceof(_val: &JsValue) -> bool
fn instanceof(_val: &JsValue) -> bool
instanceof
check to see whether the JsValue
provided is an instance of this type. Read moreSource§fn unchecked_from_js(val: JsValue) -> JsValue
fn unchecked_from_js(val: JsValue) -> JsValue
Source§fn unchecked_from_js_ref(val: &JsValue) -> &JsValue
fn unchecked_from_js_ref(val: &JsValue) -> &JsValue
Source§fn has_type<T>(&self) -> boolwhere
T: JsCast,
fn has_type<T>(&self) -> boolwhere
T: JsCast,
T
. Read moreSource§fn dyn_into<T>(self) -> Result<T, Self> ⓘwhere
T: JsCast,
fn dyn_into<T>(self) -> Result<T, Self> ⓘwhere
T: JsCast,
T
. Read moreSource§fn dyn_ref<T>(&self) -> Option<&T> ⓘwhere
T: JsCast,
fn dyn_ref<T>(&self) -> Option<&T> ⓘwhere
T: JsCast,
T
. Read moreSource§fn unchecked_into<T>(self) -> Twhere
T: JsCast,
fn unchecked_into<T>(self) -> Twhere
T: JsCast,
Source§fn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
fn unchecked_ref<T>(&self) -> &Twhere
T: JsCast,
Source§impl LongRefFromWasmAbi for JsValue
impl LongRefFromWasmAbi for JsValue
Source§impl PartialEq for JsValue
impl PartialEq for JsValue
Source§impl RefFromWasmAbi for JsValue
impl RefFromWasmAbi for JsValue
Source§type Anchor = ManuallyDrop<JsValue>
type Anchor = ManuallyDrop<JsValue>
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.Source§unsafe fn ref_from_abi(js: u32) -> <JsValue as RefFromWasmAbi>::Anchor
unsafe fn ref_from_abi(js: u32) -> <JsValue as RefFromWasmAbi>::Anchor
Source§impl TryFrom<&JsValue> for f64
impl TryFrom<&JsValue> for f64
Source§impl VectorFromWasmAbi for JsValue
impl VectorFromWasmAbi for JsValue
Auto Trait Implementations§
impl Freeze for JsValue
impl RefUnwindSafe for JsValue
impl !Send for JsValue
impl !Sync for JsValue
impl Unpin for JsValue
impl UnwindSafe for JsValue
Blanket Implementations§
§impl<T> ArchivePointee for T
impl<T> ArchivePointee for T
§type ArchivedMetadata = ()
type ArchivedMetadata = ()
§fn pointer_metadata(
_: &<T as ArchivePointee>::ArchivedMetadata,
) -> <T as Pointee>::Metadata
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T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
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impl<T> ByteSized for T
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const BYTE_ALIGN: usize = _
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