无法获取 vis.js 最后或第一个选定的网络节点

Question

我正在玩 vis.js 并且已经弄清楚如何获取所有当前选定节点的数组。

<code>var TempNodes = network.getSelectedNodes();

我的问题是返回 getSelectedNodes() 数组时所有节点 ID 的数字顺序从低到高...似乎没有办法判断最后选择的节点 ID 是什么或第一个选择的节点 ID 是什么。我只能知道选择了哪个节点 ID。

有谁知道从 getSelectedNodes 数组中找出第一个或最后一个选定节点 ID 的方法吗？

Answer 1

documentation 具体说明 getSelection()

Returns an array with the ids of the selected nodes. Returns an empty array if no nodes are selected. The selections are not ordered.

因为目前select多个节点的方法是long-press他们，你可以通过听select自己保持selection-order离子事件：

var mySelectionOrder = [];
var previouslySelected = {};
network.on('select', function(p) {
      var selected = {};
      // add newly-selected nodes at end of mySelectionOrder
      p.nodes.forEach(function(n) {
            if ( ! previouslySelected[n]) { mySelectionOrder.push(n); }
            selected[n] = true;
      });
      // remove newly-unselected entries from mySelectionOrder
      mySelectionOrder = mySelectionOrder.filter(
            function(e, i, a) { return selected[e]; });
      // prepare for next run
      previouslySelected = selected;
      // output to console to make sure it works
      console.log("Selection updated", mySelectionOrder);
});

（已编辑以修复 JS 代码；经过测试可与 this example 一起使用）

Answer 2

使用 tucuxi 提出的概念，我确实想出了一些工作代码来实现这一点。 tucuxi的代码虽然不行'straight out of the box'他的思路是对的，值得表扬

这是最终为我工作的代码

 var PreviouslySelectedNodes = [];
    var SelectedNodesInOrder = [];

    network.on('select', function (properties) {      

      // itterate through each visjs selected nodes and see if any value is not present in our current ordered list
      // If it's not already present, push it to the top of our ordered list
      var SelectedNodeIDs = network.getSelection().nodes // First get all the visjs selected nodes

      // If only one Node is currently selected, then empty the SelectedNodesInOrder array ready for a new set
      if(SelectedNodeIDs.length == 1){
          SelectedNodesInOrder = [];
      }

      // Cycle through all current selected visjs nodes
      for(var t = 0; t <= SelectedNodeIDs.length; t++){

          // cycle through all currently selected ordered nodes in our ordered array
          var found = false; flag the default as this node not already in our ordered list
          for(var y = 0; y <= SelectedNodesInOrder.length; y++){
                if(SelectedNodesInOrder[y] == SelectedNodeIDs[t]){ // This node already exists in our ordered list
                    found = true;
                }         
          }

          // If the current visjs selected node doesn't already exist in the SelectedNodesInOrder, then add it
          if(found === false){
                SelectedNodesInOrder.push(SelectedNodeIDs[t]);
          }

      }

    console.log(SelectedNodesInOrder); // test by dumping our ordered array list to the console

    });

无法获取 vis.js 最后或第一个选定的网络节点

Cannot get vis.js last or first selected network node

javascript

chap-links-library

vis.js