How to Call Go Methods from HTML Templates?

Calling Methods from Go Templates

In Go, you can define methods for custom types, allowing you to operate on those types in a more organized manner. When working with HTML templates, it's often useful to access these methods from within the template itself.

Question:

Consider the following:

type Person struct {
  Name string
}

func (p *Person) Label() string {
  return "This is " + p.Name
}

How would you utilize the Label() method within an HTML template?

Answer:

To call a method from a Go template, simply omit the parentheses. In this case, the template would look like:

{{ .Label }}

This will call the Label() method and insert its return value into the template.

Here's a full example:

package main

import (
    "html/template"
    "log"
    "os"
)

type Person string

func (p Person) Label() string {
    return "This is " + string(p)
}

func main() {
    tmpl, err := template.New("").Parse(`{{.Label}}`)
    if err != nil {
        log.Fatalf("Parse: %v", err)
    }
    tmpl.Execute(os.Stdout, Person("Bob"))
}

Additional Note:

According to the Go documentation, any method that returns one value of any type or two values, with the second being of type error, can be called from a template.

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