Struct sauron::prelude::js_sys::Proxy

#[repr(transparent)]pub struct Proxy { /* fields omitted */ }

Implementations

impl Proxy

pub fn new(target: &JsValue, handler: &Object) -> Proxy

The Proxy object is used to define custom behavior for fundamental operations (e.g. property lookup, assignment, enumeration, function invocation, etc).

MDN documentation

impl Proxy

pub fn revocable(target: &JsValue, handler: &Object) -> Object

The Proxy.revocable() method is used to create a revocable Proxy object.

MDN documentation

Methods from Deref<Target = JsValue>

pub const NULL: JsValue

pub const UNDEFINED: JsValue

pub const TRUE: JsValue

pub const FALSE: JsValue

pub fn into_serde<T>(&self) -> Result<T, Error> where
    T: for<'a> Deserialize<'a>, 

Invokes JSON.stringify on this value and then parses the resulting JSON into an arbitrary Rust value.

This function will first call JSON.stringify on the JsValue itself. The resulting string is then passed into Rust which then parses it as JSON into the resulting value.

Usage of this API requires activating the serde-serialize feature of the wasm-bindgen crate.

Errors

Returns any error encountered when parsing the JSON into a T.

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.

pub fn is_string(&self) -> bool

Tests whether this JS value is a JS 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.

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.

pub fn is_null(&self) -> bool

Tests whether this JS value is null

pub fn is_undefined(&self) -> bool

Tests whether this JS value is undefined

pub fn is_symbol(&self) -> bool

Tests whether the type of this JS value is symbol

pub fn is_object(&self) -> bool

Tests whether typeof self == "object" && self !== null.

pub fn is_function(&self) -> bool

Tests whether the type of this JS value is function.

pub fn is_truthy(&self) -> bool

Tests whether the value is "truthy".

pub fn is_falsy(&self) -> bool

Tests whether the value is "falsy".

Trait Implementations

impl AsRef<JsValue> for Proxy

pub fn as_ref(&self) -> &JsValue

Performs the conversion.

impl AsRef<Proxy> for Proxy

pub fn as_ref(&self) -> &Proxy

Performs the conversion.

impl Clone for Proxy

pub fn clone(&self) -> Proxy

Returns a copy of the value.

pub fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Proxy

pub fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Deref for Proxy

type Target = JsValue

The resulting type after dereferencing.

pub fn deref(&self) -> &JsValue

Dereferences the value.

impl From<JsValue> for Proxy

pub fn from(obj: JsValue) -> Proxy

Performs the conversion.

impl From<Proxy> for JsValue

pub fn from(obj: Proxy) -> JsValue

Performs the conversion.

impl FromWasmAbi for Proxy

type Abi = <JsValue as FromWasmAbi>::Abi

The wasm ABI type that this converts from when coming back out from the ABI boundary.

pub unsafe fn from_abi(js: <Proxy as FromWasmAbi>::Abi) -> Proxy

Recover a Self from Self::Abi.

impl IntoWasmAbi for Proxy

type Abi = <JsValue as IntoWasmAbi>::Abi

The wasm ABI type that this converts into when crossing the ABI boundary.

pub fn into_abi(self) -> <Proxy as IntoWasmAbi>::Abi

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl<'a> IntoWasmAbi for &'a Proxy

type Abi = <&'a JsValue as IntoWasmAbi>::Abi

The wasm ABI type that this converts into when crossing the ABI boundary.

pub fn into_abi(self) -> <&'a Proxy as IntoWasmAbi>::Abi

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary.

impl JsCast for Proxy

pub fn instanceof(val: &JsValue) -> bool

Performs a dynamic instanceof check to see whether the JsValue provided is an instance of this type.

pub fn unchecked_from_js(val: JsValue) -> Proxy

Performs a zero-cost unchecked conversion from a JsValue into an instance of Self

pub fn unchecked_from_js_ref(val: &JsValue) -> &Proxy

Performs a zero-cost unchecked conversion from a &JsValue into an instance of &Self.

pub fn has_type<T>(&self) -> bool where
    T: JsCast, 

Test whether this JS value has a type T.

pub 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.

pub 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.

pub fn unchecked_into<T>(self) -> T where
    T: JsCast, 

Performs a zero-cost unchecked cast into the specified type.

pub fn unchecked_ref<T>(&self) -> &T where
    T: JsCast, 

Performs a zero-cost unchecked cast into a reference to the specified type.

pub fn is_instance_of<T>(&self) -> bool where
    T: JsCast, 

Test whether this JS value is an instance of the type T.

pub fn is_type_of(val: &JsValue) -> bool

Performs a dynamic check to see whether the JsValue provided is a value of this type.

impl OptionFromWasmAbi for Proxy

pub fn is_none(abi: &<Proxy as FromWasmAbi>::Abi) -> bool

Tests whether the argument is a "none" instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi.

impl<'a> OptionIntoWasmAbi for &'a Proxy

pub fn none() -> <&'a Proxy as IntoWasmAbi>::Abi

Returns an ABI instance indicating "none", which JS will interpret as the None branch of this option.

impl OptionIntoWasmAbi for Proxy

pub fn none() -> <Proxy as IntoWasmAbi>::Abi

Returns an ABI instance indicating "none", which JS will interpret as the None branch of this option.

impl RefFromWasmAbi for Proxy

type Abi = <JsValue as RefFromWasmAbi>::Abi

The wasm ABI type references to Self are recovered from.

type Anchor = ManuallyDrop<Proxy>

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.

pub unsafe fn ref_from_abi(
    js: <Proxy as RefFromWasmAbi>::Abi
) -> <Proxy as RefFromWasmAbi>::Anchor

Recover a Self::Anchor from Self::Abi.