Module: stdgo.syscall.js

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Overview

Index

• Constants

• Variables

• class Js

• function copyBytesToGo(_dst:Array<UInt>, _src:stdgo.syscall.js.Value):Int

• function copyBytesToJS(_dst:stdgo.syscall.js.Value, _src:Array<UInt>):Int

• function funcOf(_fn:(:stdgo._internal.syscall.js.Value, :stdgo.Slice<stdgo._internal.syscall.js.Value>):stdgo.AnyInterface):stdgo.syscall.js.Func

• function global():stdgo.syscall.js.Value

• function null_():stdgo.syscall.js.Value

• function undefined():stdgo.syscall.js.Value

• function valueOf(_x:stdgo.AnyInterface):stdgo.syscall.js.Value

• typedef T_ref

• typedef Type_

• abstract Func

• abstract Value

• abstract Error

• abstract ValueError

Constants

import stdgo.syscall.js.Js

final typeBoolean:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeBoolean.typeBoolean

final typeFunction:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeFunction.typeFunction

final typeNull:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeNull.typeNull

final typeNumber:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeNumber.typeNumber

final typeObject:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeObject.typeObject

final typeString:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeString.typeString

final typeSymbol:stdgo._internal.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeSymbol.typeSymbol

final typeUndefined:stdgo.syscall.js.Type_ = stdgo._internal.syscall.js.Js_typeUndefined.typeUndefined

Variables

import stdgo.syscall.js.Js

var jsgo:stdgo.syscall.js.Value

Classes

import stdgo.syscall.js.*

class Js

Package js gives access to the WebAssembly host environment when using the js/wasm architecture.
    Its API is based on JavaScript semantics.

This package is EXPERIMENTAL. Its current scope is only to allow tests to run, but not yet to provide a comprehensive API for users. It is exempt from the Go compatibility promise.

Js function copyBytesToGo

function copyBytesToGo(_dst:Array<UInt>, _src:stdgo.syscall.js.Value):Int

CopyBytesToGo copies bytes from src to dst.
        It panics if src is not a Uint8Array or Uint8ClampedArray.
        It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.

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Js function copyBytesToJS

function copyBytesToJS(_dst:stdgo.syscall.js.Value, _src:Array<UInt>):Int

CopyBytesToJS copies bytes from src to dst.
        It panics if dst is not a Uint8Array or Uint8ClampedArray.
        It returns the number of bytes copied, which will be the minimum of the lengths of src and dst.

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Js function funcOf

function funcOf(_fn:(:stdgo._internal.syscall.js.Value, :stdgo.Slice<stdgo._internal.syscall.js.Value>):stdgo.AnyInterface):stdgo.syscall.js.Func

FuncOf returns a function to be used by JavaScript.

The Go function fn is called with the value of JavaScript's "this" keyword and the arguments of the invocation. The return value of the invocation is the result of the Go function mapped back to JavaScript according to ValueOf.

Invoking the wrapped Go function from JavaScript will pause the event loop and spawn a new goroutine. Other wrapped functions which are triggered during a call from Go to JavaScript get executed on the same goroutine.

As a consequence, if one wrapped function blocks, JavaScript's event loop is blocked until that function returns. Hence, calling any async JavaScript API, which requires the event loop, like fetch (http.Client), will cause an immediate deadlock. Therefore a blocking function should explicitly start a new goroutine.

Func.Release must be called to free up resources when the function will not be invoked any more.

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Js function global

function global():stdgo.syscall.js.Value

Global returns the JavaScript global object, usually "window" or "global".

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Js function null_

function null_():stdgo.syscall.js.Value

Null returns the JavaScript value "null".

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Js function undefined

function undefined():stdgo.syscall.js.Value

Undefined returns the JavaScript value "undefined".

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Js function valueOf

function valueOf(_x:stdgo.AnyInterface):stdgo.syscall.js.Value

ValueOf returns x as a JavaScript value:

        	| Go                     | JavaScript             |
        	| ---------------------- | ---------------------- |
        	| js.Value               | [its value]            |
        	| js.Func                | function               |
        	| nil                    | null                   |
        	| bool                   | boolean                |
        	| integers and floats    | number                 |
        	| string                 | string                 |
        	| []interface{}          | new array              |
        	| map[string]interface{} | new object             |

Panics if x is not one of the expected types.

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Typedefs

import stdgo.syscall.js.*

typedef T_ref

typedef T_ref = stdgo._internal.syscall.js.T_ref;

typedef Type_

typedef Type_ = stdgo._internal.syscall.js.Type_;

Abstracts

abstract Func

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abstract Value

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abstract Error

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abstract ValueError

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