forked from aaronpowell/webpack-golang-wasm-async-loader
/
gobridge.go
executable file
·45 lines (33 loc) · 1.01 KB
/
gobridge.go
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//+ build js,wasm
package gobridge
import (
"syscall/js"
)
var bridgeRoot js.Value
const (
bridgeJavaScriptName = "__gobridge__"
)
func registrationWrapper(fn func(this js.Value, args []js.Value) (interface{}, error)) func(this js.Value, args []js.Value) interface{} {
return func(this js.Value, args []js.Value) interface{} {
cb := args[len(args)-1]
ret, err := fn(this, args[:len(args)-1])
if err != nil {
cb.Invoke(err.Error(), js.Null())
} else {
cb.Invoke(js.Null(), ret)
}
return ret
}
}
// RegisterCallback registers a Go function to be a callback used in JavaScript
func RegisterCallback(name string, callback func(this js.Value, args []js.Value) (interface{}, error)) {
bridgeRoot.Set(name, js.FuncOf(registrationWrapper(callback)))
}
// RegisterValue registers a static value output from Go for access in JavaScript
func RegisterValue(name string, value interface{}) {
bridgeRoot.Set(name, value)
}
func init() {
global := js.Global()
bridgeRoot = global.Get(bridgeJavaScriptName)
}