How Can I Access a Go Array from Javascript in an HTML Template?

Referencing Go Array in Javascript

When integrating Golang and Javascript in a web application, it's common to face challenges in accessing Go data structures from Javascript. This article addresses the issue of referencing a Go array in Javascript within an HTML template.

The Challenge

The inability to directly access Go arrays in Javascript is due to the separation of server-side (Go) and client-side (Javascript) execution environments. Go template actions are processed on the server while Javascript code runs on the client. Therefore, template parameters like arrays do not exist in the Javascript context.

Solution #1: Using Template Actions

If the goal is to iterate over the array only once, it's possible to use Go template actions to render the array elements without creating a Javascript array. The {{range .Array}} action loops over the array, and the block can be used to print each element.

For example:

{{range .Array}}
    {{.}}
{{end}}

Solution #2: Creating a Javascript Array

To make the Go array available for further Javascript processing, you can use a template to generate Javascript code that recreates the array on the client-side. Here's an example:

<script>
    var arr = [
        {{range .Array}}
            {{.}},
        {{end}}
    ];

    // Now you have a Javascript array: arr
</script>

Alternatively, since arrays can be rendered as Javascript arrays in templates, you can simplify the code to:

<script>
    var arr = {{.Array}};

    // Now you have a Javascript array: arr
</script>

This solution allows you to recreate the array in Javascript and utilize it for any necessary processing.

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