How can I repeat HTML code multiple times in a Go web application using templates?

Repeating HTML Code Multiple Times in Go

In your Go web application, you have a need to output a specific HTML line numerous times, depending on the value of n.

Here's a way to approach this:

In HTML templates, the {{range}} action allows you to iterate over items. However, this action requires a slice, array, or map to work with.

Passing a Zero-Value Slice

To cater to this requirement, you can pass an empty slice with no allocated memory, such as make([]struct{}, n).

Template Code:

{{range $idx, $e := .}}
• {{$idx}}
{{end}}

Testing the Code:

tmpl := template.Must(template.New("").Parse(templ))
n := 5
if err := tmpl.Execute(os.Stdout, make([]struct{}, n)); err != nil {
    panic(err)
}

Output:

• 0
• 1
• 2
• 3
• 4

Using a Filled Slice

To customize the starting index for the links, you can fill the slice with specific values.

Template Code:

{{range .}}
• {{.}}
{{end}}

Example Test Code:

tmpl := template.Must(template.New("").Parse(templ))
n := 5
values := make([]int, n)
for i := range values {
    values[i] = (i + 1) * 2
}
if err := tmpl.Execute(os.Stdout, values); err != nil {
    panic(err)
}

Output:

• 2
• 4
• 6
• 8
• 10

Using a Custom Function

Finally, you can use a custom function within the templates to modify the index values as needed.

Template Code:

{{range $idx, $e := .}}{{$idx := (Add $idx)}}
• {{$idx}}
{{end}}

Custom Function:

func Add(i int) int {
    return i + 1
}

Output:

• 1
• 2
• 3
• 4
• 5

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