FancytreeJavascript切换开/关dnd5

问题描述

我正在尝试打开/关闭拖放功能。我试图通过在extensions属性中切换“ dnd5”来做到这一点，但是它不起作用。

我想在不拖放的情况下初始化树。然后，用户可以单击按钮来切换拖放功能。

*注意：“ dnd5”是我正在使用的唯一扩展名。

树按计划初始化，但是单击按钮时，拖放功能永远不会激活。我在做什么错了？

var $tree = $("#tree-drag");

function togglednD(isOn) {
   if (isOn) {
     $mainTree.extensions.push("dnd5");
   }  
   else {
      if ($mainTree.extensions.length > 0)
         $mainTree.extensions.pop();
   }
}

$("#btn-dnd-on").on("click",function() { togglednD(true); });
$("#btn-dnd-off").on("click",function() { togglednD(false); });

var $mainTree = $tree.fancytree({
            extensions: [],autoScroll: true,init: function (event,data) {

            },dnd5: {
                dragStart: function (node,data) {
                    data.effectAllowed = "all";
                    data.dropEffect = data.dropEffectSuggested;
                    return true;
                },dragenter: function (node,data) {
                    return true;
                },dragOver: function (node,data) {
                    data.dropEffect = data.dropEffectSuggested;
                },dragDrop: function (node,data) {
                    var newNode,transfer = data.dataTransfer,sourceNodes = data.otherNodeList,mode = data.dropEffect;

                    data.originalEvent.preventDefault();

                    if (data.hitMode === "after") {
                        sourceNodes.reverse();
                    }
                    if (data.otherNode) {
                        var sameTree = data.otherNode.tree === data.tree;

                        if (mode === "move") {
                            console.log("moved");                                
                            var _node = data.otherNode;

                            var childId = data.otherNode.data.id;
                            var parentId = data.node.data.id;

                            $(_node).attr({
                                "data-child": childId,"data-parent": parentId
                            });
                            data.otherNode.moveto(node,data.hitMode);
                            
                            //Assign the parent ID to the object. This will tell the system that a category has changed its home and needs its parent to be updated.
                            $("ul.ui-fancytree-source").find("li[data-id='" + childId + "']").attr("data-parent",parentId);


                        }
                        else {
                            newNode = data.otherNode.copyTo(node,data.hitMode);
                            if (mode === "link") {
                                newNode.setTitle("Link to " + newNode.title);
                            }
                            else {
                                newNode.setTitle("copy of " + newNode.title);
                            }
                        }
                    }
                    else if (data.otherNodeData) {
                        node.addChild(data.otherNodeData,data.hitMode);
                    }
                    else if (data.files.length) {
                        for (var i = 0; i < data.files.length; i++) {
                            var file = data.files[i];
                            node.addNode({ title: "'" + file.name + "' (" + file.size + " bytes)" },data.hitMode);
                        }
                    }
                    else {
                        node.addNode({ title: transfer.getData("text"),},data.hitMode);
                    }
                    node.setExpanded();
                    $(".fancytree-statusnode-nodata").parent("li[role='treeitem']").remove();
                }
            },dblclick: function (event,data) {
                // Get the next table
                var id = data.node.data.id;
                getTable(id);
                setTreeNode(id);
                node.setExpanded(true);
                node.setActive(true);
            }

           });

解决方法

初始化后将无法修改extensions列表。

相反，您可以维护一个全局标志，并在dragStart事件中返回false：

  dnd5: {
    dragStart: function (node,data) {
      if( dndDisabled ) { return false; }
      data.effectAllowed = "all";
      data.dropEffect = data.dropEffectSuggested;
      return true;
    },

另请参阅the docs。