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ListBoxObject in web_sys - Rust

Struct ListBoxObject

pub struct ListBoxObject { /* private fields */ }

Expand description

The ListBoxObject class.

MDN Documentation

This API requires the following crate features to be activated: ListBoxObject

The constructor property returns a reference to the Object constructor function that created the instance object.

MDN documentation

👎Deprecated: Use Object::hasOwn instead.

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

MDN documentation

The isPrototypeOf() method checks if an object exists in another object’s prototype chain.

MDN documentation

The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable.

MDN documentation

The toLocaleString() method returns a string representing the object. This method is meant to be overridden by derived objects for locale-specific purposes.

MDN documentation

The valueOf() method returns the primitive value of the specified object.

MDN documentation

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.

Tests whether this JS value is a JS 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.

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.

Tests whether this JS value is null

Tests whether this JS value is undefined

Tests whether this JS value is null or undefined

Tests whether the type of this JS value is symbol

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

Tests whether this JS value is an instance of Array.

Tests whether the type of this JS value is function.

Tests whether the type of this JS value is bigint.

Tests whether the value is “truthy”.

Tests whether the value is “falsy”.

Applies the binary / JS operator on two JsValues, catching and returning any RangeError thrown.

MDN documentation

Converts this type into a shared reference of the (usually inferred) input type.

Converts this type into a shared reference of the (usually inferred) input type.

Converts this type into a shared reference of the (usually inferred) input type.

The resulting type after dereferencing.

Dereferences the value.

The singular concrete type that all generic variants can be transmuted on

Converts to this type from the input type.

Converts to this type from the input type.

Converts to this type from the input type.

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

Recover a Self from Self::Abi. Read more

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

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

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

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

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

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

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

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

Test whether this JS value has a type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

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

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

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

Same as RefFromWasmAbi::Abi

Same as RefFromWasmAbi::Anchor

Same as RefFromWasmAbi::ref_from_abi

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

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more

Tests for self and other values to be equal, and is used by ==.

1.0.0 · Source§

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

The type that this value resolves to.

The Wasm ABI type references to Self are recovered from.

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.

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