从golang模板调用数组的方法

Question

So in my main.go I have a struct and a method that I can call from inside main.go without a problem. Imagine it being like this:

type Test struct {
    val1 float32
    val2 float32
}

func (t Test) callMethod() float32 {
    return t.val1 / t.val2
}

I am calling the template like this and as data I am giving an array of the Test structs, like this:

var testvar1 Test
var testvar2 Test
var teststructs [] Test
teststructs = append(teststructs, testvar1)
teststructs = append(teststructs, testvar2)
tpl.ExecuteTemplate(w, "testpage.gohtml", teststructs)

Inside the template I am trying to call the callMethod like this

{{range .}}
    {{ .callMethod }}
{{end}}

But I am getting the following error:

executing "testpage.gohtml" at <.callMethod>: can't evaluate field callMethod in type main.Test

Has anyone an Idea what I am doing wrong and has a solution for this? I am trying to fix it since many hours and I am so frustrated at this point.

Answer 1

Your Teststruct has no exported fields/methods, i.e. fields/methods within the struct that are used within the template have to start with a capital letter.

Update the method name to CallMethod

func (t Test) CallMethod() float32 {
    return t.val1 / t.val2
}

and the template:

const tmpl = `
{{range .}}
   {{.CallMethod}}
{{end}}
`

see the code https://play.golang.org/p/Vud7ipJ_Vyr