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[Golang] undefined Test in GopherJS
source link: http://siongui.github.io/2016/02/06/go-undefined-test-in-gopherjs/
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[Golang] undefined Test in GopherJS
February 06, 2016
Check if something (object, variable, API, ...) is undefined or not in GopherJS. Use js.Undefined in your if test.
For example, you can check if your browser supports localStorage API or not by:
package main
import (
"fmt"
"github.com/gopherjs/gopherjs/js"
)
func main() {
if js.Global.Get("localStorage") == js.Undefined {
fmt.Println("Your browser does not support localStorage API")
} else {
fmt.Println("Your browser supports localStorage API")
}
}
Run Code on GopherJS Playground
For null test (if a variable is null), see [3].
References:
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