How to Render Multiple Child Templates within a Go Layout Template?
Go Templates: Rendering Child Templates within a Layout
Question:
In a Golang application, how can I render multiple child templates within a parent layout template?
Setup:
The problem involves four templates: a layout template layout.html and three child templates: tags.html, content.html, and comment.html. A Go struct is provided to hold data for the child templates.
Problem:
The question arises on how to render each child template and combine the results into the layout template.
Go Implementation:
To render child templates within a layout, consider the following steps:
- Parse Template Strings: Parse the layout and child template strings into a single template using the template.Parse* function family.
- Create a Template Data Object: Create a data object that will hold values for all child templates. This object will be passed to the Execute function later.
- Define and Parse Child Templates within the Layout: In the layout template, use the {{template "childTemplateName"}} directive to invoke each child template. The childTemplateName corresponds to the name assigned in the {{define "childTemplateName"}} directive of the child template.
- Execute the Layout Template: Pass the template data object to the Execute function. The function will execute the layout template, invoking the child templates as needed and rendering them in place.
Example Code:
package main
import (
"fmt"
"html/template"
"os"
)
// Define the layout template
const layout = `
<html>
<body>
{{template "tags"}}
{{template "content"}}
{{template "comment"}}
</body>
</html>`
// Define the child templates
const tags = `{{define "tags"}}
<div>{{.Name}}</div>
{{end}}`
const content = `{{define "content"}}
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