当下拉列表中没有选项时，goJS 禁用添加新节点

Question

我有一个简单的 python flask 应用程序，我将 JSON 数据发送到我的 HTML 并使用 goJS 显示我的图表，如下所示：

我为用户制作了自定义选择下拉菜单来编辑节点和 link 文本。这些选择选项从 .txt 文件中读取并通过 flask 发送到 html。进行下拉列表中的选项，以便在选择选项一次时，无法再次选择它，直到用户删除节点或link使用该使用的选项，然后他可以再次使用该选项。到目前为止，我使用此代码使节点文本在下拉列表中可选择：

<!DOCTYPE html>
<html lang="en">
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>State Chart</title>
<meta name="description" content="A finite state machine chart with editable and interactive features." />
<meta charset="UTF-8">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="http://getbootstrap.com/dist/css/bootstrap.min.css" rel="stylesheet">

<script src="{{url_for('static', filename='go.js')}}"></script>

<!-- custom text editors -->
<script src="{{url_for('static', filename='TextEditorSelectBox.js')}}"></script>
<script src="{{url_for('static', filename='TextEditorRadioButtons.js')}}"></script>
<script src="{{url_for('static', filename='TextEditorSelectBox.js')}}"></script>


<script src="{{url_for('static', filename='DataInspector.js')}}"></script>

<link href="https://gojs.net/latest/extensions/DataInspector.css" rel="stylesheet">
<link href="{{url_for('static', filename='DataInspector.css')}}" rel="stylesheet">


<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet"> 
<script id="code">


    function init() {

        var $ = go.GraphObject.make;
        myDiagram =
        $(go.Diagram, "myDiagramDiv",  // must name or refer to the DIV HTML element
        {
            // start everything in the middle of the viewport
            initialContentAlignment: go.Spot.Center,
            // have mouse wheel events zoom in and out instead of scroll up and down
            "toolManager.mouseWheelBehavior": go.ToolManager.WheelZoom,
            // support double-click in background creating a new node
            "clickCreatingTool.archetypeNodeData": { text: "new node" },
            // enable undo & redo
            "textEditingTool.defaultTextEditor": window.TextEditorSelectBox,
            "undoManager.isEnabled": true,
            "layout": new go.ForceDirectedLayout(),
            "ModelChanged": function(e) {
                console.log("Diagram model changed!");
              if (e.change === go.ChangedEvent.Remove && e.modelChange === "linkDataArray") {
                console.log("eee");
                console.log(e);
                var linkdata = e.oldValue;
                console.log("linkdata");
                console.log(linkdata);
                var oldstr = linkdata.text;
                console.log("oldstr");
                console.log(oldstr);

                if (!oldstr) return;
                var choices = e.model.modelData.choices;
                console.log("choices");
                console.log(choices);
                var idx = choices.indexOf(oldstr);
                if (idx < 0) {
                  console.log("adding choice: " + oldstr);
                  var newchoices = Array.prototype.slice.call(choices);
                  newchoices.push(oldstr);
                  e.model.set(e.model.modelData, "choices", newchoices);
                }
              }
            }
        });

        //myDiagram.model.set(myDiagram.model.modelData, "choices", JSON.parse('{{ link_choices | tojson | safe}}'));
        //myDiagram.model.set(myDiagram.model.modelData, "choices", ["one", "two", "three"]);
        console.log("myDiagram.model.modelData");
        console.log(myDiagram.model.modelData);
        console.log("myDiagram.model.modelData.choices");
        console.log(myDiagram.model.modelData.choices);


        // when the document is modified, add a "*" to the title and enable the "Save" button
        myDiagram.addDiagramListener("Modified", function(e) {
            var button = document.getElementById("SaveButton");
            if (button) button.disabled = !myDiagram.isModified;
            var idx = document.title.indexOf("*");
            if (myDiagram.isModified) {
                if (idx < 0) document.title += "*";
            } 
            else {
                if (idx >= 0) document.title = document.title.substr(0, idx);
            }
        });

        myDiagram.addDiagramListener("textEdited", function(e) {
            console.log("Text is edited");
            console.log(e);

            //CHECK IF LINK,
            //IF YES REMOVE THAT OPTION FROM LIST

        });

        myDiagram.addDiagramListener("SelectionDeleting", function(e) {
            console.log("inside SelectionDeleting");
            console.log(e);

            //CHECK IF LINK,
            //IF YES PUT THAT OPTION BACK IN OPTION LIST

        });

            // define the Node template
        myDiagram.nodeTemplate =
          $(go.Node, "Auto",
            new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
            // define the node's outer shape, which will surround the TextBlock
            $(go.Shape, "RoundedRectangle",
              {
                parameter1: 20,  // the corner has a large radius
                fill: $(go.Brush, "Linear", { 0: "rgb(254, 201, 0)", 1: "rgb(254, 162, 0)" }),
                stroke: null,
                portId: "",  // this Shape is the Node's port, not the whole Node
                fromLinkable: true, fromLinkableDuplicates: true,
                toLinkable: true, toLinkableDuplicates: true,
                cursor: "pointer"
              }),
            $(go.TextBlock,
              {
                font: "bold 11pt helvetica, bold arial, sans-serif",
                editable: true,  // editing the text automatically updates the model data
                //textEditor: window.TextEditorRadioButtons, // defined in textEditorRadioButtons.js
                // this specific TextBlock has its own choices:
                textEditor: window.TextEditorRadioButtons,
                //choices: JSON.parse('{{ choices | tojson | safe}}')
                choices: nodeChoices
              },
            new go.Binding("text").makeTwoWay())
        );

        myDiagram.nodeTemplate.selectionAdornmentTemplate =
        $(go.Adornment, "Spot",
            $(go.Panel, "Auto",
            $(go.Shape, { stroke: "dodgerblue", strokeWidth: 2, fill: null }),
            $(go.Placeholder)
        ),
        $(go.Panel, "Horizontal",
            { alignment: go.Spot.Top, alignmentFocus: go.Spot.Bottom },
            $("Button",
                { click: editText },  // defined below, to support editing the text of the node
                $(go.TextBlock, "t",
                { font: "bold 10pt sans-serif", desiredSize: new go.Size(15, 15), textAlign: "center" })
            ),
            $("Button",
            { // drawLink is defined below, to support interactively drawing new links
                click: drawLink,  // click on Button and then click on target node
                actionMove: drawLink  // drag from Button to the target node
            },
            $(go.Shape,
                { geometryString: "M0 0 L8 0 8 12 14 12 M12 10 L14 12 12 14" })
            ),
            $("Button",
            {
                actionMove: dragNewNode,  // defined below, to support dragging from the button
                _dragData: { text: "?????", color: "lightgray" },  // node data to copy
                click: clickNewNode  // defined below, to support a click on the button
            },
            $(go.Shape,
                { geometryString: "M0 0 L3 0 3 10 6 10 x F1 M6 6 L14 6 14 14 6 14z", fill: "gray" })
          )
        )
      );

    //myDiagram.model.set(myDiagram.model.modelData, "choices", JSON.parse('{{ link_choices | tojson | safe}}'));
    //myDiagram.model.set(myDiagram.model.modelData, "choices", ["one", "two", "three"]);
    console.log("myDiagram.model.modelData");
    console.log(myDiagram.model.modelData);
    console.log(myDiagram.model.modelData.choices);

    function editText(e, button) {
        //console.log(e);

      var node = button.part.adornedPart;
      console.log("node");
      //console.log(node);
      e.diagram.commandHandler.editTextBlock(node.findObject("TEXTBLOCK"));
      //$("#nodeText").val(node.findObject("TEXTBLOCK"));
    }

    function drawLink(e, button) {
      var node = button.part.adornedPart;
      var tool = e.diagram.toolManager.linkingTool;
      tool.startObject = node.port;
      e.diagram.currentTool = tool;
      tool.doActivate();
    }

   // used by both clickNewNode and dragNewNode to create a node and a link
    // from a given node to the new node
    function createNodeAndLink(data, fromnode) {
        var diagram = fromnode.diagram;
        var model = diagram.model;
        var nodedata = model.copyNodeData(data);
        model.addNodeData(nodedata);
        var newnode = diagram.findNodeForData(nodedata);
        var linkdata = model.copyLinkData({});
        model.setFromKeyForLinkData(linkdata, model.getKeyForNodeData(fromnode.data));
        model.setToKeyForLinkData(linkdata, model.getKeyForNodeData(newnode.data));
        model.addLinkData(linkdata);
        diagram.select(newnode);
        return newnode;
    }

    // the Button.click event handler, called when the user clicks the "N" button
    function clickNewNode(e, button) {
        var data = button._dragData;
        if (!data) return;
        e.diagram.startTransaction("Create Node and Link");
        var fromnode = button.part.adornedPart;
        var newnode = createNodeAndLink(button._dragData, fromnode);
        newnode.location = new go.Point(fromnode.location.x + 200, fromnode.location.y);
        e.diagram.commitTransaction("Create Node and Link");
    }

    // the Button.actionMove event handler, called when the user drags within the "N" button
    function dragNewNode(e, button) {
        var tool = e.diagram.toolManager.draggingTool;
        if (tool.isBeyondDragSize()) {
            var data = button._dragData;
            if (!data) return;
            e.diagram.startTransaction("button drag");  // see doDeactivate, below
            var newnode = createNodeAndLink(data, button.part.adornedPart);
            newnode.location = e.diagram.lastInput.documentPoint;
            // don't commitTransaction here, but in tool.doDeactivate, after drag operation finished
            // set tool.currentPart to a selected movable Part and then activate the DraggingTool
            tool.currentPart = newnode;
            e.diagram.currentTool = tool;
            tool.doActivate();
        }
    }

    // using dragNewNode also requires modifying the standard DraggingTool so that it
    // only calls commitTransaction when dragNewNode started a "button drag" transaction;
    // do this by overriding DraggingTool.doDeactivate:
    var tool = myDiagram.toolManager.draggingTool;
    tool.doDeactivate = function() {
        // commit "button drag" transaction, if it is ongoing; see dragNewNode, above
        if (tool.diagram.undoManager.nestedTransactionNames.elt(0) === "button drag") {
            tool.diagram.commitTransaction();
        }
        go.DraggingTool.prototype.doDeactivate.call(tool);  // call the base method
    };

    // replace the default Link template in the linkTemplateMap
    myDiagram.linkTemplate =
        $(go.Link,  // the whole link panel
        {
            curve: go.Link.Bezier, 
            adjusting: go.Link.Stretch,
            reshapable: true, 
            relinkableFrom: true, 
            relinkableTo: true,
            toShortLength: 3
        },
        new go.Binding("points").makeTwoWay(),
        new go.Binding("curviness"),
        $(go.Shape,  // the link shape
            { strokeWidth: 1.5 }),
        $(go.Shape,  // the arrowhead
            { toArrow: "standard", stroke: null }),
        $(go.Panel, "Auto",
            $(go.Shape,  // the label background, which becomes transparent around the edges
            {
                fill: $(go.Brush, "Radial", { 0: "rgb(240, 240, 240)", 0.3: "rgb(240, 240, 240)", 1: "rgba(240, 240, 240, 0)" }),
                stroke: null
            }),
            $(go.TextBlock,
              {
                background: "white",
                editable: true,
                textEditor: window.TextEditorSelectBox, // defined in extensions/textEditorSelectBox.js
                textEdited: function(tb, oldstr, newstr) {
                  var choices = tb.diagram.model.modelData.choices;
                  console.log("choices");
                  console.log(choices);
                  console.log("newstr");
                  console.log(newstr);
                  console.log("oldstr");
                  console.log(oldstr);
                  var idx = choices.indexOf(newstr);
                  if (idx >= 0 && oldstr !== newstr) {
                    console.log(choices);
                    console.log("choices");
                    console.log(choices);
                    console.log("removing choice " + idx + ": " + newstr);
                    var newchoices = Array.prototype.slice.call(choices);
                    newchoices.splice(idx, 1);
                    tb.diagram.model.set(tb.diagram.model.modelData, "choices", newchoices);
                    tb.editable = false;  // don't allow choice again
                  }
                }
              },
            // editing the text automatically updates the model data
            //new go.Binding("text"),
            new go.Binding("text").makeTwoWay(),
            new go.Binding("choices").ofModel())
        )
    );


    var inspector = new Inspector('myInspectorDiv', myDiagram,
    {
        // uncomment this line to only inspect the named properties below instead of all properties on each object:
        // includesOwnProperties: false,
        properties: {
            "text": { },
            // an example of specifying the type
            "password": { show: Inspector.showIfPresent, type: 'password' },
            // key would be automatically added for nodes, but we want to declare it read-only also:
            "key": { readOnly: true, show: Inspector.showIfPresent },
            // color would be automatically added for nodes, but we want to declare it a color also:
            "color": { show: Inspector.showIfPresent, type: 'color' },
            // Comments and LinkComments are not in any node or link data (yet), so we add them here:
            "Comments": { show: Inspector.showIfNode  },
            "flag": { show: Inspector.showIfNode, type: 'checkbox' },
            "LinkComments": { show: Inspector.showIfLink },
            "isGroup": { readOnly: true, show: Inspector.showIfPresent }
        }
    });

    // read in the JSON data from flask
    loadGraphData();

    }

    function loadGraphData() {
        var graphDataString = JSON.parse('{{ diagramData | tojson | safe}}');
        //console.log("graphDataString");
        //console.log(graphDataString);

        myDiagram.model = go.Model.fromJson(graphDataString);
        //myDiagram.model.set(myDiagram.model.modelData, "choices", ["one", "two", "three"]);
        myDiagram.model.set(myDiagram.model.modelData, "choices", JSON.parse('{{ link_choices | tojson | safe}}'));
        console.log("whole model");
        console.log(myDiagram.model);
    }

    function saveGraphData(form, event) {
        console.log("inside saveGraphData");
        event.preventDefault();

        document.getElementById("mySavedModel").value = myDiagram.model.toJson();
        form.submit();
    }

    function zoomToFit(){
        console.log("inside zoomToFit");
        myDiagram.zoomToRect(myDiagram.documentBounds);
    }

    function zoomIn(){
        console.log("inside zoomIn");
        myDiagram.commandHandler.increaseZoom();
    }
    function zoomOut(){
        console.log("inside zoomOut");
        myDiagram.commandHandler.decreaseZoom();
    }

</script>
</head>
<body onload="init()">

    <div id=formWrapper style="padding: 30px;">

        <form method="POST" action="http://localhost:5000/updateResultFile" name="updateResultFileForm" 
        id="updateResultFileForm" 
        onsubmit="saveGraphData(this, event);">

            <div id="graphWrapper" style="margin-bottom: 15px;">
                <div id="myDiagramDiv" style="border: solid 1px black; width: 100%; height: 800px;margin-bottom: 15px;"></div>
                <div style="display: none;"><input id="mySavedModel" name="mySavedModel"></div>

                <button class="btn btn-default" type="submit"> Save <i class="fa fa-save"> </i> </button>

            </div>

        </form>

        <div id="myInspectorDiv">
        </div>

        <div>
            <button class="btn btn-default" onclick="zoomToFit()"> Zoom to fit  <i class="fa fa-search"> </i> </button>
            <button class="btn btn-default" onclick="zoomIn()"> Zoom in  <i class="fa fa-search-plus"> </i> </button>
            <button class="btn btn-default" onclick="zoomOut()"> Zoom out  <i class="fa fa-search-minus"> </i> </button>
        </div>


    </div>

</body>
</html>

现在我想在用户使用 link 的所有选项并且其中 none 可用时，我想禁用可用性以添加新的 link.此外，如果他使用节点文本的所有选项，我想禁用添加新节点的可能性。但是，如果用户删除了一些节点并且节点文本的选项再次可用，我想让他能够使用该选项添加新节点但我不知道如何使图表禁用他的核心部分添加新节点或 links？

此外，双击 link 文本以显示带有选项的下拉菜单有点困难。是否有任何技巧或选项可以使其更易于使用？

Answer 1

没想到你问了这么多次。

function init() {
  var $ = go.GraphObject.make;

  myDiagram =
    $(go.Diagram, "myDiagramDiv",
      {
        initialContentAlignment: go.Spot.Center,
        "undoManager.isEnabled": true,
        "ModelChanged": function(e) {     // just for demonstration purposes,
          if (e.isTransactionFinished) {  // show the model data in the page's TextArea
            document.getElementById("mySavedModel").textContent = e.model.toJson();
          }
          if (e.change === go.ChangedEvent.Remove) {
            if (e.modelChange === "linkDataArray") {
              var linkdata = e.oldValue;
              var oldstr = linkdata.text;
              if (!oldstr) return;
              var linkchoices = e.model.modelData.linkchoices;
              var idx = linkchoices.indexOf(oldstr);
              if (idx < 0) {
                console.log("deletion adding link choice: " + oldstr);
                var newlinkchoices = Array.prototype.slice.call(linkchoices);
                newlinkchoices.push(oldstr);
                e.model.set(e.model.modelData, "linkchoices", newlinkchoices);
              }
            } else if (e.modelChange === "nodeDataArray") {
              var nodedata = e.oldValue;
              var oldstr = nodedata.text;
              if (!oldstr) return;
              var nodechoices = e.model.modelData.nodechoices;
              var idx = nodechoices.indexOf(oldstr);
              if (idx < 0) {
                console.log("deletion adding node choice: " + oldstr);
                var newnodechoices = Array.prototype.slice.call(nodechoices);
                newnodechoices.push(oldstr);
                e.model.set(e.model.modelData, "nodechoices", newnodechoices);
              }
            }
          }
        }
      });

  myDiagram.nodeTemplate =
    $(go.Node, "Auto",
      $(go.Shape,
        { fill: "white", portId: "", fromLinkable: true, toLinkable: true, cursor: "pointer" },
        new go.Binding("fill", "color")),
      $(go.TextBlock,
        {
          margin: 8,
          editable: true,
          textEditor: window.TextEditorSelectBox, // defined in extensions/textEditorSelectBox.js
          textEdited: function(tb, oldstr, newstr) {
            if (oldstr !== newstr) {
              console.log("changing from " + oldstr + " to " + newstr);
              var model = tb.diagram.model;
              var nodechoices = model.modelData.nodechoices;
              if (!nodechoices) {
                nodechoices = [];
                model.set(model.modelData, "nodechoices", nodechoices);
              }
              var idx = nodechoices.indexOf(newstr);
              if (idx >= 0) {
                console.log("removing node choice " + idx + ": " + newstr);
                model.removeArrayItem(nodechoices, idx);
              }
              if (oldstr) {
                console.log("  adding node choice " + oldstr);
                model.addArrayItem(nodechoices, oldstr);
              }
            }
          }
        },
        new go.Binding("text").makeTwoWay(),
        new go.Binding("choices", "nodechoices").ofModel())
    );

  myDiagram.linkTemplate =
    $(go.Link,
      $(go.Shape),
      $(go.Shape, { toArrow: "OpenTriangle" }),
      $(go.TextBlock,
        {
          background: "white",
          editable: true,
          textEditor: window.TextEditorSelectBox, // defined in extensions/textEditorSelectBox.js
          textEdited: function(tb, oldstr, newstr) {
            if (oldstr !== newstr) {
              console.log("changing from " + oldstr + " to " + newstr);
              var model = tb.diagram.model;
              var linkchoices = model.modelData.linkchoices;
              if (!linkchoices) {
                linkchoices = [];
                model.set(model.modelData, "linkchoices", linkchoices);
              }
              var idx = linkchoices.indexOf(newstr);
              if (idx >= 0) {
                console.log("removing link choice " + idx + ": " + newstr);
                model.removeArrayItem(linkchoices, idx);
              }
              if (oldstr) {
                console.log("  adding link choice " + oldstr);
                model.addArrayItem(linkchoices, oldstr);
              }
            }
          }
        },
        new go.Binding("text").makeTwoWay(),
        new go.Binding("choices", "linkchoices").ofModel())
    );

  myDiagram.model = new go.GraphLinksModel(
  [
    { key: 1, text: "Alpha", color: "lightblue" },
    { key: 2, text: "Beta", color: "orange" },
    { key: 3, text: "Gamma", color: "lightgreen" },
    { key: 4, text: "Delta", color: "pink" }
  ],
  [
    { from: 1, to: 2, text: "one" },
    { from: 1, to: 3, text: "two" },
    { from: 3, to: 4, text: "three" }
  ]);
  myDiagram.model.set(myDiagram.model.modelData, "nodechoices", ["Epsilon"]);
  myDiagram.model.set(myDiagram.model.modelData, "linkchoices", ["four"]);
}

当下拉列表中没有选项时，goJS 禁用添加新节点

goJS disable adding new nodes when no options in dropdown

javascript

html

gojs