gopherjs: github.com/gopherjs/gopherjs/js Index | Files

package js

import "github.com/gopherjs/gopherjs/js"

Package js provides functions for interacting with native JavaScript APIs. Calls to these functions are treated specially by GopherJS and translated directly to their corresponding JavaScript syntax.

Use MakeWrapper to expose methods to JavaScript. When passing values directly, the following type conversions are performed: 

| Go type               | JavaScript type       | Conversions back to interface{} |
| --------------------- | --------------------- | ------------------------------- |
| bool                  | Boolean               | bool                            |
| integers and floats   | Number                | float64                         |
| string                | String                | string                          |
| []int8                | Int8Array             | []int8                          |
| []int16               | Int16Array            | []int16                         |
| []int32, []int        | Int32Array            | []int                           |
| []uint8               | Uint8Array            | []uint8                         |
| []uint16              | Uint16Array           | []uint16                        |
| []uint32, []uint      | Uint32Array           | []uint                          |
| []float32             | Float32Array          | []float32                       |
| []float64             | Float64Array          | []float64                       |
| all other slices      | Array                 | []interface{}                   |
| arrays                | see slice type        | see slice type                  |
| functions             | Function              | func(...interface{}) *js.Object |
| time.Time             | Date                  | time.Time                       |
| -                     | instanceof Node       | *js.Object                      |
| maps, structs         | instanceof Object     | map[string]interface{}          |

Additionally, for a struct containing a *js.Object field, only the content of the field will be passed to JavaScript and vice versa.

Index

Package Files

js.go

func Debugger Uses

❖
func Debugger()

Debugger gets compiled to JavaScript's "debugger;" statement.

func Keys Uses

❖
func Keys(o *Object) []string

Keys returns the keys of the given JavaScript object.

type Error Uses

❖
type Error struct {
    *Object
}

Error encapsulates JavaScript errors. Those are turned into a Go panic and may be recovered, giving an *Error that holds the JavaScript error object.

func (*Error) Error Uses

❖
func (err *Error) Error() string

Error returns the message of the encapsulated JavaScript error object.

func (*Error) Stack Uses

❖
func (err *Error) Stack() string

Stack returns the stack property of the encapsulated JavaScript error object.

type M Uses

❖
type M map[string]interface{}

M is a simple map type. It is intended as a shorthand for JavaScript objects (before conversion).

type Object Uses

❖
type Object struct {
    // contains filtered or unexported fields
}

Object is a container for a native JavaScript object. Calls to its methods are treated specially by GopherJS and translated directly to their JavaScript syntax. A nil pointer to Object is equal to JavaScript's "null". Object can not be used as a map key.

❖
var Global *Object

Global gives JavaScript's global object ("window" for browsers and "GLOBAL" for Node.js).

❖
var Module *Object

Module gives the value of the "module" variable set by Node.js. Hint: Set a module export with 'js.Module.Get("exports").Set("exportName", ...)'.

❖
var Undefined *Object

Undefined gives the JavaScript value "undefined".

func InternalObject Uses

❖
func InternalObject(i interface{}) *Object

InternalObject returns the internal JavaScript object that represents i. Not intended for public use.

func MakeFunc Uses

❖
func MakeFunc(fn func(this *Object, arguments []*Object) interface{}) *Object

MakeFunc wraps a function and gives access to the values of JavaScript's "this" and "arguments" keywords.

func MakeWrapper Uses

❖
func MakeWrapper(i interface{}) *Object

MakeWrapper creates a JavaScript object which has wrappers for the exported methods of i. Use explicit getter and setter methods to expose struct fields to JavaScript.

func NewArrayBuffer Uses

❖
func NewArrayBuffer(b []byte) *Object

NewArrayBuffer creates a JavaScript ArrayBuffer from a byte slice.

func (*Object) Bool Uses

❖
func (o *Object) Bool() bool

Bool returns the object converted to bool according to JavaScript type conversions.

func (*Object) Call Uses

❖
func (o *Object) Call(name string, args ...interface{}) *Object

Call calls the object's method with the given name.

func (*Object) Delete Uses

❖
func (o *Object) Delete(key string)

Delete removes the object's property with the given key.

func (*Object) Float Uses

❖
func (o *Object) Float() float64

Float returns the object converted to float64 according to JavaScript type conversions (parseFloat).

func (*Object) Get Uses

❖
func (o *Object) Get(key string) *Object

Get returns the object's property with the given key.

func (*Object) Index Uses

❖
func (o *Object) Index(i int) *Object

Index returns the i'th element of an array.

func (*Object) Int Uses

❖
func (o *Object) Int() int

Int returns the object converted to int according to JavaScript type conversions (parseInt).

func (*Object) Int64 Uses

❖
func (o *Object) Int64() int64

Int64 returns the object converted to int64 according to JavaScript type conversions (parseInt).

func (*Object) Interface Uses

❖
func (o *Object) Interface() interface{}

Interface returns the object converted to interface{}. See table in package comment for details.

func (*Object) Invoke Uses

❖
func (o *Object) Invoke(args ...interface{}) *Object

Invoke calls the object itself. This will fail if it is not a function.

func (*Object) Length Uses

❖
func (o *Object) Length() int

Length returns the object's "length" property, converted to int.

func (*Object) New Uses

❖
func (o *Object) New(args ...interface{}) *Object

New creates a new instance of this type object. This will fail if it not a function (constructor).

func (*Object) Set Uses

❖
func (o *Object) Set(key string, value interface{})

Set assigns the value to the object's property with the given key.

func (*Object) SetIndex Uses

❖
func (o *Object) SetIndex(i int, value interface{})

SetIndex sets the i'th element of an array.

func (*Object) String Uses

❖
func (o *Object) String() string

String returns the object converted to string according to JavaScript type conversions.

func (*Object) Uint64 Uses

❖
func (o *Object) Uint64() uint64

Uint64 returns the object converted to uint64 according to JavaScript type conversions (parseInt).

func (*Object) Unsafe Uses

❖
func (o *Object) Unsafe() uintptr

Unsafe returns the object as an uintptr, which can be converted via unsafe.Pointer. Not intended for public use.

type S Uses

❖
type S []interface{}

S is a simple slice type. It is intended as a shorthand for JavaScript arrays (before conversion).

Package js is imported by 865 packages. Updated 2020-12-19. Refresh now. Tools for package owners.