Server side form select search

During development of a website using golang html/templates, we are trying to create an auto complete form dropdown.

Is there any java snippet available to get the data from API when typing in the searchbox? We don't want to fill the options here during SSR as there might be a few thousand items available, so instead we want to show a limited number of items matching the search input.

<div>
                            <label class="form-label fw-bold small" for="parentCategory">{{ t .Localization "lbl_product_category_parent" }}</label>
                            <select id="parentCategory" 
                                    name="parentId" 
                                    class="form-select"
                                    data-mdb-select-init
                                    data-mdb-filter="true"
                                    data-mdb-placeholder="{{ t .Localization "lbl_product_category_parent_select" }}"
                            >
                                <option value="">{{ t .Localization "lbl_product_category_parent_none" }}</option>
                                {{ if .Data.ParentId }}
                                    <option value="{{ .Data.ParentId }}" selected>
                                        {{ .Data.ParentName }}
                                    </option>
                                {{ end }}
                            </select>
                        </div>