With Golang Templates how can I set a variable in each template?
Question
How can I set a variable in each template that I can use in other templates eg
{{ set title "Title" }}
in one template then in my layout
<title> {{ title }} </title>
Then when it's rendered
tmpl, _ := template.ParseFiles("layout.html", "home.html")
it will set the title according to whatever was set in home.html instead of having to make a struct for each view page when it isn't really necessary. I hope I made sense, thanks.
Just for clarification:
layout.html:
<!DOCTYPE html>
<html>
<head>
<title>{{ title }} </title>
</head>
<body>
</body>
</html>
home.html:
{{ set Title "Home" . }}
<h1> {{ Title }} Page </h1>
1 answers
solution1
7 ACCPTED 2015-06-03 08:59:26
If you want to use the Value in another template you can pipeline it to the dot:
{{with $title := "SomeTitle"}}
{{$title}} <--prints the value on the page
{{template "body" .}}
{{end}}
body template:
{{define "body"}}
<h1>{{.}}</h1> <--prints "SomeTitle" again
{{end}}
As far as i know it is not possible to go upwards in the chain. So layout.html gets rendered before home.html , so you cant pass a value back.
In your example it would be the best solution to use a struct and pass it from the layout.html to the home.html using the dot :
main.go
package main
import (
"html/template"
"net/http"
)
type WebData struct {
Title string
}
func homeHandler(w http.ResponseWriter, r *http.Request) {
tmpl, _ := template.ParseFiles("layout.html", "home.html")
wd := WebData{
Title: "Home",
}
tmpl.Execute(w, &wd)
}
func pageHandler(w http.ResponseWriter, r *http.Request) {
tmpl, _ := template.ParseFiles("layout.html", "page.html")
wd := WebData{
Title: "Page",
}
tmpl.Execute(w, &wd)
}
func main() {
http.HandleFunc("/home", homeHandler)
http.HandleFunc("/page", pageHandler)
http.ListenAndServe(":8080", nil)
}
layout.html
<!DOCTYPE html>
<html>
<head>
<title>{{.Title}} </title>
</head>
<body>
{{template "body" .}}
</body>
</html>
home.html
{{define "body"}}
<h1>home.html {{.Title}}</h1>
{{end}}
page.html
{{define "body"}}
<h1>page.html {{.Title}}</h1>
{{end}}
Also go has a nice documentation on how to use templates:
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