JSON cannot unmarshal object into GO value of type string

Question

Writing Golang app using github.com/zserge/lorca package. This binds golang funcs to Javascript. I have HTML with text input and submit button which should pass the text input as an arg into the Javascript binding. It looks as follows:

<input type="text" name="MACADD" style="height:20px; width:210px">
<input type="submit" value="submit" onclick="JSBINDFUNC(MACADD)">

The JSBINDFUNC takes golang type string for input. When I hit submit, it should be passing the text entered for MACADD as an arg into the JSBINDFUNC func.

However, I'm coming back with the err

exception":{"type":"string","value":"json: cannot unmarshal object into Go value of type string"}

Needing this object to become golang string.

More complete snip:

package main

import (
    "fmt"
    "log"
    "net/url"

    "github.com/zserge/lorca"
)

func main() {
    ui, err := lorca.New("data:text/html,"+url.PathEscape(`
        <html>
                <form action="/action_page.php">
                    MAC Address:<br>
                    <input type="text" name="MACADD" style="height:20px; width:210px">
                    <input type="submit" value="Submit" onclick="JSBINDFUNC(MACADD)">
                </form> 
            </body>
        </html>
        `), "", 480, 320)
    if err != nil {
        log.Fatal(err)
    }
    //ui.Bind implemented @ https://github.com/zserge/lorca/blob/master/ui.go#L110
    ui.Bind("JSBINDFUNC", func(MAC string) {
        fmt.Println(MAC)
        return
    })
    defer ui.Close()
    <-ui.Done()
}

You need to post your go-code snippet. Not being familiar with this pkg, I would suspect one marshals form data into a struct - since forms have many fields - and marshaling into a single string will not work. — colm.anseo
– colm.anseo, Commented Mar 27, 2019 at 19:09
@colminator just updated, you should be able to copy/paste, go build and get the exact error. Make sure you've got Chrome installed. — user3051040
– user3051040, Commented Mar 27, 2019 at 19:50

colm.anseo · Accepted Answer · 2019-03-27 20:10:44Z

3

The issue is with your javascript. Update your onclick attribute like so:

<input type="submit" value="Submit" onclick="JSBINDFUNC(MACADD.value)">

edited Mar 27, 2019 at 20:10

answered Mar 27, 2019 at 20:04

colm.anseo

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3 Comments

user3051040 Over a year ago

I just changed JSBINDFUNC(MACADD) to JSBINDFUNC(MACADD.value) per @atayenel. This works.

colm.anseo Over a year ago

I justed edited the answer to reflect @atayenel shorter suggestion

atakanyenel Over a year ago

I like lorca. I'm glad it was html problem and not a lorca problem :)

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