使用Echo和html / template，如何将HTML传递给模板？

Question

I'm using Echo to build my first small Go web service and I went with the example they provide for using html/template for HTML page templates to simplify page management.

On one of the pages I'm collecting data from a backend API and wanted to display it in a table. I'm generating the HTML and then passing it into the template. Unfortunately html/template is encoding it as safe text rather than letting the HTML pass through.

I can see in the html/template docs how you could tell it the HTML is safe there but I'm not sure how to do that same thing inside Echo.

How do I make it so that HTML passed through Render is accepted as HTML instead of encoded?

Simplified versions of the go files and template:

server.go

package main

import (
  "io"
  "html/template"

  "github.com/labstack/echo"
  "github.com/labstack/echo/middleware"
  "github.com/labstack/gommon/log"
)

type Template struct {
  templates *template.Template
}
func (t *Template) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
    return t.templates.ExecuteTemplate(w, name, data)
}

func main() {
  t := &Template{
    templates: template.Must(template.ParseGlob("views/*.html")),
  }

  e := echo.New()
  e.Logger.SetLevel(log.INFO)
  e.Use(middleware.Logger())

  e.Renderer = t

  e.GET("/", homePage)

  // HTTP server
  e.Logger.Fatal(e.Start(":1323"))
}

pages.go

package main

import (
  "github.com/labstack/echo"
)

func homePage(c echo.Context) error {
  return c.Render(http.StatusOK, "home", "<p>HTML Test</p>")
}

views/home.html

{{define "home"}}
{{template "head"}}
{{template "navbar"}}

{{.}}

{{template "foot"}}
{{end}}

Answer 1

This is covered in the html/template package summary:

By default, this package assumes that all pipelines produce a plain text string. It adds escaping pipeline stages necessary to correctly and safely embed that plain text string in the appropriate context.

When a data value is not plain text, you can make sure it is not over-escaped by marking it with its type.

For example:

return c.Render(http.StatusOK, "home", template.HTML("<p>HTML Test</p>"))