How to Pass Data Between Templates in Go\'s text/template Package?

Passing Data Between Templates

A common requirement in template rendering is the ability to pass data between templates. In Go's text/template package, this can be achieved using a combination of functions and template invocation techniques.

To pass a simple number as an additional argument to a nested template, you can define a function that merges its arguments into a single slice value. This function can then be registered and used in the template invocation.

Here's an example:

<code class="go">func args(vs ...interface{}) []interface{} {
    return vs
}</code>

<code class="go">t, err := template.New("t").Funcs(template.FuncMap{"args": args}).Parse(...)</code>

In the index.html template, use the args function to merge the current data with the additional argument:

<code class="html">{{ template "image_row" args . 5 }}</code>

Within the image_row.html template, access the arguments using the index built-in function:

<code class="html">{{ define "image_row" }}
   To stuff here {{ index . 0 }} {{ index . 1 }}
{{ end }}</code>

This approach allows you to pass arbitrary data between templates and build more complex and reusable template components.

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