How to Capture Golang Template Output into a Variable?

Capturing Golang Template Output into a Variable

Within a Golang template, attempting to capture the output of another template directly into a variable can result in an error. To achieve this functionality, a custom function must be registered to capture the output.

Solution:

1. Register a function that executes a named template and stores the result in a buffer:

func execTempl(name string) (string, error) {
    buf := &bytes.Buffer{}
    err := t.ExecuteTemplate(buf, name, nil)
    return buf.String(), err
}

2. Register this function with the template:

t := template.Must(template.New("").Funcs(template.FuncMap{
    "execTempl": execTempl,
}).Parse(tmpl))

3. Use the registered function to capture the output of a named template:

{{$var := execTempl "my-template"}}

Example Template:

const tmpl = `{{define "my-template"}}my-template content{{end}}
See result:
{{$var := execTempl "my-template"}}
{{$var}}
`

Output:

See result:

my-template content

This approach allows you to execute a named template and store its output in a template variable. You can then use this variable to pass to other functions or include in the template output.

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