A template action is a delimited instruction written as {{...}}. During execution, the template engine evaluates the action against the current value, called the dot (.). Text outside actions is emitted unchanged; {{.}} prints the supplied value like fmt.Sprintf("%v", value). section 11.1.2 section 11.6
Render a habit count
Put <p>You have {{.}} habits to follow.</p> in index.html, parse it with template.New("index").Parse(indexPage), and execute it with tpl.Execute(w, 5). The browser renders the value 5 in place of the action. section 11.1.2
Template actions can also express:
- Structure: {{if ...}}, {{else}}, and {{end}} select conditional output. section 11.6
- Iteration: {{range ...}} walks slices, arrays, maps, or channels. section 11.6
- Data access: {{.Field}} reads exposed structure fields, while {{with .Date}} narrows the dot context. section 11.6
Listing 11.10 index.html: Outputting a variable
<!DOCTYPE html>
<html lang="en">
<head>
<title>Learn Go</title>
</head>
<body>
<h1>Habits</h1>
<p>You have {{.}} habits to follow.</p> #1
</body>
</html>
See the complete HTML fragment that places a template action inside ordinary markup. section 11.1.2
