How Can I Efficiently Create Repeating HTML Structures in Go Templates?

Creating Repeating HTML Structures with Go Templates

In Go web applications, occasions arise where iteratively generating HTML elements becomes necessary. For instance, creating pagination links in a list may require duplicating a line of code multiple times. This article demonstrates an effective solution utilizing Go templates and their inherent looping capabilities.

Leveraging the {{range}} Action

To achieve repetition in templates, Go relies on the {{range}} action. However, this action expects an iterable data structure, such as a slice, array, or map. To facilitate this, you can pass an empty slice to the template, as empty slices consume minimal memory overhead.

Implementing the Solution

Consider the following template that generates pagination links:

In the accompanying test code, we initialize a slice of a specific length and pass it to the template:

This results in the following output:

Customizing Numbered Elements

If the default indexing (starting from 0) is not suitable, you can opt to customize the number displayed. Two approaches are available:

1. Filling the Slices: Assign explicit values to the slice elements.

2. Using Custom Functions: Define a function that increments numbers and call it within the template.

Both these methods allow you to control the numbering of the generated elements.

By leveraging the flexibility of Go templates and these techniques, you can streamline the process of repeating HTML structures within your Golang web applications.

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