CODEWITHSUNDEEP
templatesgo
Johannes Gehrs
Johannes Gehrs

Reputation: 914

Using Template Blocks in Combination with Template Functions in Golang

I'm looking to use template blocks in Golang to get a "template inheritance" style overwrite logic.

I have a base.html template which is something like this:

<title>{{block "title" .}}Default Title{{end}}</title>
<body>{{block "content" .}}This is the default body.{{end}}</body>

And then I have a template blogpost.html like so:

{{define "title"}}Blog Post Title{{end}}
{{define "content"}}Lorem Ipsum...{{end}}

All of this works flawlessly as long as I just use ParseFiles and then execute the template

t, err := template.ParseFiles("./templates/base.html", "./templates/blogpost.html")
t.Execute(t, viewModel)

The way I did it was calling ParseFiles once for every template I needed to render. E. g. I did not call templates by name.

However, I now want to also use Template Functions. Now I need to call template.New to get an empty template, assign a name, add the template functions and parse the files (Funcs "must be called before the template is parsed") :

tpl := template.Must(
    template.New("somename").Funcs(sprig.FuncMap()).ParseGlob("*.html")
)

This seems to be incompatible with my idea of template inheritance. I have to ExecTemplatewith my base.html as a parameter in order to get any output. However, I'd like to load one base template and many content templates. Then call the content templates by name.

Am I misunderstanding the way that Golang templates and/or Blocks are intended to be used? What's an elegant and idiomatic way to perform this kind of task?

Upvotes: 4

Views: 7694

Answers (1)

Thundercat
Thundercat

Reputation: 121129

Use the following to add template functions to what you already have working:

t, err := template.New("base.html").Funcs(sprig.FuncMap()).ParseFiles("./templates/base.html", "./templates/blogpost.html")

Upvotes: 3

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