当父节点被选中时，如何触发Kendo TreeView中子节点的onCheck事件

Question

I'm populating a tree view from a datasource provided by a service worker:我正在从服务工作者提供的数据源填充树视图：

postCreate: function () {
    var self = this;
    self._loadLayerConfiguration()
        .then(function (data) {
            self.layerConfig = data;
            self._treeView = $("#LayerList").kendoTreeView({
                dataValueField: "Id",
                dataTextField: "Title",
                checkboxes: {
                    checkChildren: true
                },

                check: self._onCheck.bind(self),
                dataSource: new kendo.data.HierarchicalDataSource({ /*...*/}
                })
            });
        });
},

As you can see, the configuration is set up, so that all child elements to get checked, when a parent element is checked, which then triggers the _onCheck method.如您所见，配置已设置，以便在检查父元素时检查所有子元素，然后触发_onCheck方法。

This method is now supposed to act on every checkbox that is changing:此方法现在应该作用于每个正在更改的复选框：

_onCheck: function (e) {
    var dataItem = this._treeView.data("kendoTreeView").dataItem(e.node);
    if (!dataItem.layer && dataItem.Url !== null) { //Url is null, if this is a Group layer
        //load FeatureLayer, if not loaded
        //load legend, if not loaded
        //add to map
        //omitted for brevity
    }
    dataItem.layer.setVisibility(dataItem.checked);
    this._checkChildren.call(this, dataItem);
},

the problem here is, that the onCheck event is only triggered for the node the user has directly clicked, not for all children, that are affected by it.这里的问题是， onCheck 事件仅针对用户直接单击的节点触发，而不是针对受其影响的所有子节点。

I have tried to recursively loop through all the children of the dataItem and trigger the check event manually, but to no avail:我试图递归遍历 dataItem 的所有子项并手动触发检查事件，但无济于事：

_checkChildren: function (dataItem) {
    var self = this;
    if (dataItem.hasChildren) {
        var children = dataItem.children.data();
        children.forEach(function (child) {
            child.set("checked", dataItem.checked);

            //self._treeView.trigger("check", {
            //  node: self._treeView.findByUid(child.uid)
            //});
            if (child.hasChildren) {
                //recurse
                self._checkChildren.call(self, child);
            }
        });
    }
},

The effect is, that the event is raised for the directly changed checkbox in the tree view, but not its children.结果是，为树视图中直接更改的复选框引发事件，而不是其子项。 The children only do get checked.孩子们只做检查。 What is a correct way to trigger the check event for all child nodes affected by a parent node?为受父节点影响的所有子节点触发检查事件的正确方法是什么？

Please do not get irritated by the .bind() and .call() invocations.请不要被.bind()和.call()调用激怒。 Since this kendo widget has to be implemented into a Dojo 1.10 widget, the structure tends to get a bit complex.由于这个 kendo 小部件必须在 Dojo 1.10 小部件中实现，因此结构往往会变得有点复杂。

Answer 1

That's the expected behaviour according to the documentation :根据文档，这是预期的行为：

Triggered after the user has checked or unchecked a checkbox.在用户选中或取消选中复选框后触发。 If checkChildren is true, the event is triggered after all checked states are updated.如果 checkChildren 为 true，则在所有选中状态更新后触发该事件。

So the event will be triggered only once, no matter how many children was checked.因此，无论检查了多少个孩子，该事件都只会触发一次。 What I would do in your case is to handle the event with a parser to loop through all dataItems calling the _onCheck event for each one:在您的情况下，我会做的是使用解析器处理事件以遍历所有数据项，为每个数据项调用_onCheck事件：

check: function(e) {
    _onCheck(this.dataItem(e.node));

    $(e.node).find("li").each((i, node) => _onCheck(this.dataItem(node)));
}

_onCheck: function _onCheck(dataItem) {
    console.log(dataItem);
};

Working demo:工作演示：

 <!DOCTYPE html> <html> <head> <meta charset="utf-8"/> <title>Kendo UI Snippet</title> <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2019.1.220/styles/kendo.common.min.css"/> <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2019.1.220/styles/kendo.rtl.min.css"/> <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2019.1.220/styles/kendo.silver.min.css"/> <link rel="stylesheet" href="https://kendo.cdn.telerik.com/2019.1.220/styles/kendo.mobile.all.min.css"/> <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script> <script src="https://kendo.cdn.telerik.com/2019.1.220/js/kendo.all.min.js"></script> </head> <body> <div id="treeview"></div> <script> let _onCheck = function _onCheck(dataItem) { console.log(dataItem); }; $("#treeview").kendoTreeView({ checkboxes: { checkChildren: true }, dataSource: [ { text: "foo", items: [ { text: "bar" } ] } ], check: function(e) { _onCheck(this.dataItem(e.node)); $(e.node).find("li").each((i, node) => _onCheck(this.dataItem(node))); } }); </script> </body> </html>

Dojo道场

当父节点被选中时，如何触发Kendo TreeView中子节点的onCheck事件

问题描述

1 个解决方案

解决方案1
1 已采纳 2019-04-10 11:57:59

当父节点被选中时，如何触发Kendo TreeView中子节点的onCheck事件

问题描述

1 个解决方案

解决方案1 1 已采纳 2019-04-10 11:57:59

解决方案1
1 已采纳 2019-04-10 11:57:59