How to Pass Data to Included Templates in Go?

Passing Data to Rendered Templates in Go

In Go templates, including another template is a straightforward process using the {{ template "include-template-name" }} syntax. However, sometimes it becomes necessary to pass additional data to the included template.

Introducing Dynamic Parameter Passing

Consider a scenario where you want to pass a number to a template, "image_row.html", that uses this number to construct rows dynamically. This requires passing the number as an additional argument to the template invocation.

Custom Function for Passing Multiple Arguments

Since there's no built-in support for passing multiple arguments to a template, you can create a custom function to merge the arguments into a single slice. Register this function with Funcs and use it in the template invocation:

<code class="go">func args(vs ...interface{}) []interface{} { return vs }
t, err := template.New("t").Funcs(template.FuncMap{"args":args}).Parse...</code>

Usage in Template Invocation

Inside the main template, you can pass the arguments using the args function:

{{ template "image_row" args . 5 }}

Accessing Arguments in Included Template

Within "image_row.html", you can access the arguments using the built-in index function:

{{ define "image_row" }}
   To stuff here {{index . 0}} {{index . 1}}
{{ end }}

This approach allows you to pass dynamic data to rendered templates, enabling greater flexibility in template design and data handling.

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