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https://github.com/norunners/vert
WebAssembly interop between Go and JS values.
https://github.com/norunners/vert
go golang interop webassembly
Last synced: about 1 month ago
JSON representation
WebAssembly interop between Go and JS values.
- Host: GitHub
- URL: https://github.com/norunners/vert
- Owner: norunners
- License: mit
- Created: 2018-03-25T17:26:47.000Z (almost 7 years ago)
- Default Branch: main
- Last Pushed: 2022-12-03T07:58:38.000Z (about 2 years ago)
- Last Synced: 2024-08-03T19:10:02.748Z (5 months ago)
- Topics: go, golang, interop, webassembly
- Language: Go
- Homepage:
- Size: 7.81 KB
- Stars: 100
- Watchers: 7
- Forks: 15
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
- awesome-go-extra - vert - 03-25T17:26:47Z|2021-12-29T04:52:53Z| (WebAssembly / Routers)
README
# vert
[](https://pkg.go.dev/github.com/norunners/vert)
[](https://github.com/norunners/vert/actions/workflows/test.yml)
Package `vert` provides WebAssembly interop between Go and JS values.
## Install
```bash
GOOS=js GOARCH=wasm go get github.com/norunners/vert
```
## Examples
### Hello World!
Below is a trivial string value interop.
```go
package main
import "github.com/norunners/vert"
func main() {
v := vert.ValueOf("Hello World!")
// Use v as a JS value.
s := ""
v.AssignTo(&s)
// Use s as a Go value.
}
```
### Structs & Objects
Go structs and JS objects interop seamlessly.
```go
package main
import "github.com/norunners/vert"
type Data struct {
Message string
}
func main() {
v := vert.ValueOf(Data{
Message: "Hello World!",
})
// e.g. {"Message": "Hello World!"}
d := &Data{}
v.AssignTo(d)
}
```
### Tagged Struct Fields
Tagged struct fields allow defined JS field names.
```go
package main
import "github.com/norunners/vert"
type Data struct {
Message string `js:"msg"`
}
func main() {
v := vert.ValueOf(Data{
Message: "Hello World!",
})
// The defined JS tag names the field.
// e.g. {"msg": "Hello World!"}
d := &Data{}
v.AssignTo(d)
}
```
## Error Handling
`AssignTo` returns an `error` value.
```go
package main
import "github.com/norunners/vert"
type Data struct {
Message string
}
func main() {
v := vert.ValueOf("Hello World!")
d := &Data{}
if err := v.AssignTo(d); err != nil {
// Handle error.
}
}
```
## Why?
Package `syscall/js`, of the Go standard library, has limited interop support between Go and JS values.
1. The function `js.ValueOf` will not accept struct types. The result panics with `ValueOf: invalid value`.
2. The type `js.Value.` does not support an `Interface` or *assignment* method for non-basic Go values.
However, the methods `Bool`, `Int`, `Float` and `String` support basic Go values.
Package `vert` leverages and extends `syscall/js` to accommodate these shortcomings.
## License
* [MIT License](LICENSE)