How to set a variable for an external HTML template in Go?

Question

I've two Go templates.

top.html:

<html>
<head>
    <title>{{ .title }}</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta charset="UTF-8">
</head>
<body>

and register.html:

{{ template "top.html" . }}
    <h1>Register account</h1>
...

Currently to set the title I use the function:

r.GET("/register", func(c *gin.Context) {
    c.HTML(http.StatusOK, "register.html", gin.H{
        "title" : "Register Account"
    })
})

This is not ideal as I have to set the parameter for every webpage. How can I set the title in top.html from register.html? I'd much rather have something that looks like:

{{ set .title = "Register Account" }}
{{ template "top.html" . }}
    <h1>Register account</h1>
...

Of course, the above code does not work. Is there anything available to achieve what I want?

score 1 · Answer 1 · answered Apr 09 '20 at 07:41

You can do this by implementing a template function. For example:

func mapset(m map[string]string, key, val string) error {
    m[key] = val
    return nil
}

Then, after registering it with the Funcs method, instead of {{ set .title = "Register Account" }} you would use it as:

{{ (mapset . "title" "Register Account") }}

https://play.golang.com/p/a08OVDpLLH4

How to set a variable for an external HTML template in Go?

1 Answers1