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Nested Template Variable Scope in Golang

I just spent the past couple hours trying to figure out why I couldn’t pass a Title variable to my header.html template, which is nested into every page on my site. I figured I would share because the answer was slightly harder to figure out than I would have expected. I hope this helps somebody.

On mypage.html Variable was populated properly.

    {{ define "mypage" }}
    {{ template "header" }}
    <somehtml>{{ .Variable }}</somehtml>
    {{ end }}

But the Title was never populated in header.html

    {{ define "header" }}
    <html>
    	<head>
    		<title>{{ .Title }}</title>
    	</head>
    </html>
    {{ end }}

I found out that there is variable scope in templates. Each nested template executes independently and variables passed to mypage.html will not be seen by header.html unless you pipe them through like this:

    {{ define "mypage" }}
    {{ template "header" . }}
    <somehtml>{{ .Variable }}</somehtml>
    {{ end }}

Notice the period after the include of the header template. The former attempt executed, but did so with nil data which is why Title was empty. The good news is during that 2 hours I cleaned up how I used the templates and discovered (IMO) a cleaner way to pass changing data structures with anonymous structs. So the time wasn’t completely wasted.

Here is the relevant documentation explaining the pipeline capabilities of Go’s template system.

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