書名： Go Web Development Cookbook
作者名： Arpit Aggarwal
本章字?jǐn)?shù)： 236字
更新時間： 2021-08-27 19:01:16

How to do it…

In this recipe, we are going to create a first-template.html with a couple of placeholders whose value will be injected by the template engine at runtime. Perform the following steps:

Create first-template.html inside the templates directory by executing the following Unix command:

$ mkdir templates && cd templates && touch first-template.html

Copy the following content to first-template.html:

<html>
  <head>
    <meta charset="utf-8">
    <title>First Template</title>
    <link rel="stylesheet" href="/static/stylesheets/main.css">
  </head>
  <body>
    <h1>Hello {{.Name}}!</h1>
    Your Id is {{.Id}}
  </body>
</html>

The preceding template has two placeholders, {{.Name}} and {{.Id}}, whose values will be substituted or injected by the template engine at runtime.

Create first-template.go, where we will populate the values for the placeholders, generate an HTML as an output, and write it to the client, as follows:

import 
(
  "fmt"
  "html/template"
  "log"
  "net/http"
)
const 
(
  CONN_HOST = "localhost"
  CONN_PORT = "8080"
)
type Person struct 
{
  Id   string
  Name string
}
func renderTemplate(w http.ResponseWriter, r *http.Request) 
{
  person := Person{Id: "1", Name: "Foo"}
  parsedTemplate, _ := template.ParseFiles("templates/
  first-template.html")
  err := parsedTemplate.Execute(w, person)
  if err != nil 
  {
    log.Printf("Error occurred while executing the template
    or writing its output : ", err)
    return
  }
}
func main() 
{
  http.HandleFunc("/", renderTemplate)
  err := http.ListenAndServe(CONN_HOST+":"+CONN_PORT, nil)
  if err != nil 
  {
    log.Fatal("error starting http server : ", err)
    return
  }
}

With everything in place, the directory structure should look like the following:

Run the program with the following command:

$ go run first-template.go

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Go Web Development Cookbook

How to do it…