dedecms 联动列表

<select id="category" onchange="loadSubCategories()">
    <option value="">请选择分类</option>
    <!-- 动态生成的分类选项 -->
    <option value="1">分类1</option>
    <option value="2">分类2</option>
    <!-- 更多选项 -->
</select>

<select id="subcategory">
    <option value="">请选择子分类</option>
    <!-- 子分类选项将通过JavaScript动态加载 -->
</select>

<script>
function loadSubCategories() {
    var categoryId = document.getElementById('category').value;
    var xhr = new XMLHttpRequest();
    xhr.onreadystatechange = function() {
        if (xhr.readyState == 4 && xhr.status == 200) {
            document.getElementById('subcategory').innerHTML = xhr.responseText;
        }
    };
    xhr.open('GET', 'get_subcategories.php?category_id=' + categoryId, true);
    xhr.send();
}
</script>