通过html / template删除传递的参数周围的空格

Question

When i pass argument to onclick function i got spaces around that argument, why and how remove them?

t, _ := template.New("").Parse(`<div onclick="test({{.}})">{{.}}</div>`)
t.Execute(os.Stdout, 1)

Result:

<div onclick="test( 1 )">1</div>

playground

Edit:

Updated by Dave help, from template we can do something like this:

t, _ := template.New("").Funcs(template.FuncMap{
    "test": func(i interface{}) template.JS {
        switch i.(type) {
        case int:
            s := strconv.Itoa(i.(int))
            return template.JS(s)   
        // other types
        default:
            panic("bad type")
        }
    },
}).Parse(`<div onclick="test({{test .}})">{{.}}</div>`)
t.Execute(os.Stdout, 1)

playground

Answer 1

It's a result of Golang doing some things to ensure that malicious JS doesn't end up in your template. If you specify that what you are passing in is safe for javascript, it will work fine.

type JS

Use of this type presents a security risk: the encapsulated content should come from a trusted source, as it will be included verbatim in the template output.

https://play.golang.org/p/TUOECg1YDtl

t.Execute(os.Stdout, template.JS("1"))

Result:

<div onclick="test(1)">1</div>