html
<div class="layui-form-item"> <label class="layui-form-label">所属国家：</label> <div class="layui-input-inline"> <asp:DropDownList ID="ddlarea" lay-verify="required" runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddlarea_SelectedIndexChanged" lay-filter="area"></asp:DropDownList></div> </div>js
var form = layui.form; form.on('select(area)', function(data){ // ... 前端处理 / AJAX 填充等 ... // 触发服务器端 SelectedIndexChanged __doPostBack('<%= ddlarea.UniqueID %>', ''); });