layui的 下拉菜单 如何验证是不是已选

Posted 2023-03-29

参考技术A 可以用获得他的value值，如果没有就是没有选择（没有试过，你可以试试）

[Layui]layui使用tree实现树形下拉菜单

一. 效果演示 基于V2.6.8

二. 插入css样式、引用js插件

  <link rel="stylesheet" href="~/layui/css/layui.css" media="all">
    @*<link rel="stylesheet" type="text/css" href="~/layui/font/">*@
    <style type="text/css">
        .treeSelect .layui-select-title span 
            line-height: 38px;
        

        .layui-form-select dl 
            padding: 0;
        
    </style>

三. 添加html代码

<form class="layui-form layui-form-pane" style="margin: 50px;">
        <div class="layui-form-item">
            <label class="layui-form-label">菜单栏目</label>
            <div class="layui-input-block" style="width: 300px;">
                <div class="layui-unselect layui-form-select treeSelect">
                    <div class="layui-select-title">
                        <span class="layui-input layui-unselect" id="treeclass">选择栏目</span>
                        <input type="hidden" name="selectID" value="12">
                        <i class="layui-edge"></i>
                    </div>
                    @*<div id="meuntree" class="demo-tree-more"></div>*@
                    <dl class="layui-anim layui-anim-upbit">
                        <dd>
                            <ul id="meuntree"></ul>
                        </dd>
                    </dl>
                </div>
            </div>
        </div>
    </form>

四. JS代码

<script src="~/layui/layui.js"></script>
<script type="text/javascript">
    layui.config(
        base: '~/layui/' //静态资源所在路径
    );
    layui.use(['layer', 'tree', 'form'], function () 
        var $ = layui.jquery,
            layer = layui.layer,
            form = layui.form,
            tree = layui.tree;
        //初始化权限
        function init_auth() 
            console.log("权限菜单初始化");
            var data = [];
            $.ajax(
                url: "http://localhost:8089/api/SysMenu/GetSysMenuList",    //后台数据请求地址
                type: "get",
                async: false,
                success: function (resut) 
                    data = resut;
                    var formatdata = [];
                    for (var i in data)      // pId为0时表示为根节点
                        if (data[i].pid == '-1') 
                            var tempObject = ;
                            tempObject.title = data[i].name;
                            tempObject.id = data[i].id;
                            tempObject.children = getChildren(tempObject.id);
                            formatdata.push(tempObject);
                        
                    
                    function getChildren(id)     //递归体  即对每条data逐条递归找children
                        var tempArray = [];
                        for (var i in data) 
                            if (data[i].pid == id) 
                                var tempChild = ;
                                tempChild.title = data[i].name;
                                tempChild.id = data[i].id;
                                if (selectChildren(data[i].id))    //若存在子节点，继续递归；否则为叶节点，停止递归
                                    tempChild.children = getChildren(data[i].id);
                                
                                tempArray.push(tempChild);
                            
                        
                        return tempArray;
                    
                    function selectChildren(id)    // 是否存在子节点
                        for (var i in data) 
                            if (data[i].pid == id) 
                                return true;
                            
                        
                        return false;
                    

                    //转成符合要求的格式
                    console.log(formatdata);
                    //基本演示
                    tree.render(
                        elem: '#meuntree'
                        , data: formatdata
                        
                        , id: 'authlist'
                        , isJump: true //是否允许点击节点时弹出新窗口跳转
                        , click: function (obj) 
                            var data = obj.data;  //获取当前点击的节点数据
                            //layer.msg('状态：' + obj.state + '<br>节点数据：' + JSON.stringify(data));
                            var $select = $($(this)[0].elem).parents(".layui-form-select");
                            $select.removeClass("layui-form-selected").find(".layui-select-title span").html(obj.data.title).end().find("input:hidden[name='selectID']").val(obj.data.id);

                            var selectId = $("input[name='selectID']").val();
                            layer.msg("选择了id=" + selectId + "的数据" + '<br>节点数据：' + obj.data.title, 
                                icon: 1,
                                time: 5000,
                                offset: '15px'
                            );
                        
                    );
                
            );
            //return data;
        ;

    
        init_auth();
        // 默认选中
        var checkNode = 
            id: 4
            ,title: '用户管理'
        
        var $select = $(".layui-form-select");
        $select.removeClass("layui-form-selected").find(".layui-select-title span").html(checkNode.title).end().find("input:hidden[name='selectID']").val(checkNode.id);
        form.render();


        $(".treeSelect").on("click", ".layui-select-title", function (e) 
            $(".layui-form-select").not($(this).parents(".layui-form-select")).removeClass("layui-form-selected");
            $(this).parents(".treeSelect").toggleClass("layui-form-selected");
            layui.stope(e);
        ).on("click", "dl i", function (e) 
            layui.stope(e);
        );
        $(document).on("click", function (e) 
            $(".layui-form-select").removeClass("layui-form-selected");
        );

    );
</script>