How Can I Access a Go Array in JavaScript?

Referencing Go Array in JavaScript

In Go, you may transfer an array to your front-end HTML file. To access the first item in the array, you can use the 'index' template action, as exemplified by 'index .Array 0'. However, a JavaScript for-loop that attempts to iterate through all elements in the array may encounter a syntax error.

This error stems from the disparity between template actions and JavaScript code. Template actions are executed server-side in Go, while JavaScript is interpreted and run client-side in the browser. Thus, JavaScript cannot directly access template parameters.

Solution Options

There are two primary approaches to resolve this issue:

1. Server-Side Iteration: Use template actions to complete the required iterations. For instance, the code below prints each array element:

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

2. Client-Side Array Creation: Create JavaScript code using the template to construct an array object. This array can then be manipulated and processed using JavaScript:

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

    // Perform JavaScript operations on arr here
</script>

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

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

    // Perform JavaScript operations on arr here
</script>

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