How to Assign Golang Template Output to a Variable?-Golang-php.cn

How to Capture or Assign Golang Template Output to Variable In Go, you can define and execute templates that can dynamically generate HTML or other text formats. One may want to capture the output of a template and assign it to a variable.

Problem This is not directly possible using Go's built-in templating language. Attempting to do so, as in the following example, will result in a "unexpected in operand" error:

{{$var := template "my-template"}} Copy after login Solution To bypass this limitation, you can register a custom function that retrieves the template output. Here's how to do it:

Register a Custom Function: var t *template.Template

// execTempl retrieves the output of a named template. func execTempl(name string) (string, error) { buf := &bytes.Buffer{} // Create a buffer to store the template output. err := t.ExecuteTemplate(buf, name, nil) // Execute the template into the buffer. return buf.String(), err } Copy after login Associate the Function with the Template: t = template.Must(template.New("").Funcs(template.FuncMap{ "execTempl": execTempl, }).Parse(tmpl)) Copy after login Execute the Template and Capture Output: if err := t.Execute(os.Stdout, nil); err != nil { panic(err) } Copy after login Use the Captured Output: In your template, you can use the registered "execTempl" function to retrieve the output of a named template and assign it to a variable:

const tmpl = `{{define "my-template"}}my-template content{{end}} See result: {{$var := execTempl "my-template"}} {{$var}} ` Copy after login Example Here is a complete example that demonstrates the usage of this technique:

package main

import ( "bytes" "fmt" "os" "text/template" )

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

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

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

if err := t.Execute(os.Stdout, nil); err != nil { fmt.Println(err) } } Copy after login Running the above program will produce the following output:

See result: my-template content Copy after login By using this technique, you can capture the output of arbitrary templates and store it in variables for further processing or presentation.

How to Assign Golang Template Output to a Variable?

How to Capture or Assign Golang Template Output to Variable

Problem

Solution

Example

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