How to Use Partial Templates in Go

Use template.ParseFiles to load multiple template files, then call ExecuteTemplate on the parent template to render a specific partial by name. This allows you to define reusable components in separate files and inject them into a main layout.

package main

import (
	"html/template"
	"os"
)

func main() {
	// Load the main template and the partial
	tmpl, err := template.ParseFiles("layout.html", "header.html", "footer.html")
	if err != nil {
		panic(err)
	}

	// Execute the main template, which includes the partials
	err = tmpl.ExecuteTemplate(os.Stdout, "layout.html", nil)
	if err != nil {
		panic(err)
	}
}

In your layout.html, reference the partials using {{template "header.html"}} or {{template "footer.html"}}.

Partial templates are like reusable Lego blocks for your web pages. Instead of copying the same header or footer code into every single page, you save that code in one file and tell your main page to plug it in. This keeps your code clean and makes updates instant across your entire site.