golang html template doesn't display anything

Question

I have this code for html/template, and it won't run. I want to display each element in the array and it will return nothing. Please ignore the ioutil file reading.

type Person struct {
    Name string
    Age int
}

type Page struct {
    test [3]Person
    test2 string
}

func main() {
    var a [3]Person
    a[0] = Person{Name: "test", Age: 20}
    a[1] = Person{Name: "test", Age: 20}
    a[2] = Person{Name: "test", Age: 20}

    p:= Page{test: a}

    c, _ := ioutil.ReadFile("welcome.html")    
    s := string(c)

    t := template.New("")
    t, _ = t.Parse(s)
    t.Execute(os.Stdout, p)
}

and welcome.html:

{{range .test}}
    item
{{end}}

icza · Accepted Answer · 2016-08-23 12:26:57Z

3

The Page.test field is not exported, it starts with a lowercase letter. The template engine (just like everything else) can only access exported fields.

Change it to:

type Page struct {
    Test [3]Person
    Test2 string
}

And all the other places where you refer to it, e.g. p:= Page{Test: a}. And also in the template:

{{range .Test}}
    item
{{end}}

And also: never omit checking errors! The least you can do is panic:

c, err := ioutil.ReadFile("welcome.html") 
if err != nil {
    panic(err)
}
s := string(c)

t := template.New("")
t, err = t.Parse(s)
if err != nil {
    panic(err)
}
err = t.Execute(os.Stdout, p)
if err != nil {
    panic(err)
}

Try it on the Go Playground.

edited Aug 23, 2016 at 12:26

answered Apr 8, 2015 at 20:29

icza

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2 Comments

Nickl Over a year ago

that worked, thank you very much. i actually missed that field exporting thing, where can i read about it?

icza Over a year ago

@Nickl In the Language specification: Exported Identifiers. The template engine is in a different package (html/template), so the rules apply to it too.

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