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How can I truncate strings in Golang templates?

Patricia Arquette

Nov 15, 2024 am 01:42 AM

How can I truncate strings in Golang templates?

Truncating Strings in Golang Templates

In Golang HTML templates, it is possible to truncate text displayed using the {{.Content}} expression . For instance, consider the following template:

{{ range .SomeContent }}
 ....
    {{ .Content }}
 ....

{{ end }}

Currently, {{ .Content }} outputs a lengthy string:

At times et malesuada fames and ante ipsum primis in faucibus. Sometimes it's time to put it on itself, or it's a layer of felis vulputate. Until the ultricies I was pure, not some medical dignissim et. The entire arc of my life. Pellentesque a ipsum quis velit venenatis vulputate vulputate ut enim.

To truncate this string to 25 characters, you can use printf within the template:

{{ printf "%.25s" .Content }}

Alternatively, you can provide the truncation length as a separate integer argument to printf:

{{ printf "%.*s" 25 .Content }}

Note that the truncation operation measures the length of the string in Unicode code points (runes), unlike the C printf function, which measures in bytes.

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