Go Web Page Template served Blank

Question

I wrote this Go Lang code for serving web page with template and values passed to parameters through Go program

// +build

package main

import (
    "html/template"
    "io/ioutil"
    "net/http"
)
type Blog struct {
    title   string
    heading string
    para    string
}
func loadfile(filename string) (string, error) {
    byte, err := ioutil.ReadFile(filename)
    return string(byte), err
}
func handler(w http.ResponseWriter, r *http.Request) {
    blog := Blog{title: "GoLang", heading: "WebServer", para: "coding"}
    t, err := template.ParseFiles("test.html")
    fmt.Println(err)
    t.Execute(w, blog)
}
func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":9000", nil)
}

HTML Template file named as test.html as follows

<html>
<head>
<title>{{.title}}</title>
</head>
<body>

<h1>{{.heading}}</h1>
<p>{{.para}}</p>

</body>
</html>

When I execute the program, the issue is that the page served is coming up as blank. The parameters that were to be passed to the template don't show up on the page rendered. I even printed the error but there is no error

Yandry Pozo · Accepted Answer · 2016-12-11 10:43:00Z

2

You should write the first letter of the fields of Blog with upper case to make them public

type Blog struct {
    Title   string
    Heading string
    Para    string
}

Also you can pass a map to the method Execute(), something like this:

b := map[string]string{
    "title": "GoLang",
    "heading": "WebServer",
    "para": "coding",
}
t.Execute(w, b)

answered Dec 11, 2016 at 10:43

Yandry Pozo

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2 Comments

Tahseen Over a year ago

Thanks you so much. I didn't know that non-capital makes the variable private. So just a question on this - if the variables of struct are private, we can only use them in the functions that struct ?

Yandry Pozo Over a year ago

If the field is private will be visible only at package scope, in your example it will be accessible in any file inside the main package, but because t.Execute() is in other pkg will not be able to access the fields. That's the way to do encapsulation in Go private: lower case, public: upper case

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