How Can I Dynamically Refresh a Template Section in Go with Variable Updates?

Dynamically Refreshing a Template Section with Variable Updates in Go

In Go, there isn't native support for selectively refreshing portions of a template when variables are updated. To achieve this functionality, a custom approach is required.

Implementation Steps

1. Refactor Templates:
Separate the template that renders the "Addresses" section by creating a partial template using the {{define "name"}} action. Place this partial template in a separate file or embed it locally using {{template "name"}}.

2. Create or Modify Handlers:
Define a handler that exclusively executes and renders the "Addresses" partial template. This handler should send its output directly to the HTTP response. You can create a separate handler or modify your existing handler to handle both the full template and the partial "Addresses" rendering.

3. Client-Side Modifications:
When you wish to update the "Addresses" section dynamically, initiate an AJAX request to the handler responsible for rendering only that section. Replace the HTML content of the wrapper element for the "Addresses" section with the response text from the AJAX call.

Code Snippet

The client-side code for this dynamic update could resemble:

var addresseesElement = document.getElementById("addressees");
var xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
    if (xhr.readyState == 4 && xhr.status == 200) {
        addresseesElement.outerHTML = xhr.responseText;
    }
}
xhr.open("GET", "path-to-addresses-render", true);
xhr.send();

Alternative Framework Implementation

Gowut, a single-page web application framework for Go, provides similar functionality for partial template updates. Developers can refer to Gowut's js.go file for implementation details.

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