Question

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

我想为用户编制自定义选项下拉菜单以编辑节点和链接文本。到目前为止，我使用此代码在下拉列表中选择节点文本：

<!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='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">

    var nodeChoices = ['choice 1', 'choice 2', 'choice 3', 'choice 4', 'choice 5'];
    var linkChoices = ['link choice 1', 'link choice 2', 'link choice 3', 'link choice 4', 'link choice 5'];

    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()
        });


        // 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" })
          )
        )
      );

    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,  // the label text
            {
                textAlign: "center",
                font: "12pt helvetica, arial, sans-serif",
                margin: 4,
                editable: true,  // enable in-place editing
                textEditor: window.TextEditorRadioButtons,
                //choices: JSON.parse('{{ choices | tojson | safe}}')
                choices: linkChoices
            },
            // editing the text automatically updates the model data
            new go.Binding("text").makeTwoWay())
        )
    );


    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);
    }

    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>

看起来像这样：

节点文本一切都很好，但我的链接文本有问题。我希望当用户选择一个他不能在其他链接文本上使用该选项的选项时。此外，我想删除该链接时再次提供该选项。

正如您在代码中看到的那样，我在我的图表上添加了2个事件监听器（textEdited和SelectionDeleting），当用户编辑文本或删除某些内容时，它们工作正常，但我不知道如何提取有关事件对象的信息和它的文字。

我需要确保它是链接，以便我可以在我的选择列表中删除或添加该事件对象文本。任何帮助将不胜感激。

Answer 1

好的，我们假设链接标签的选项列表保存在 Model.modelData 对象中。我将该物业命名为“＃34;选择＆＃34;”，但当然您可以使用您喜欢的任何名称。 myDiagram.model.set(myDiagram.model.modelData, "choices", ["one", "two", "three"]);

您的链接模板可能如下所示： 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) { var choices = tb.diagram.model.modelData.choices; var idx = choices.indexOf(newstr); if (idx >= 0 && oldstr !== newstr) { 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 } } }, new go.Binding("text"), new go.Binding("choices").ofModel()) );

请注意 TextBlock.textEditor 是如何定义为TextEditorSelectBox的，并且 TextBlock.textEdited 事件处理程序已定义为设置modelData.choices属性为没有选择字符串的新数组。

它还将 TextBlock.editable 设置为false，以便用户无法为该链接重新选择。这是避免重复编辑问题的一种方法;但你可以实施自己的政策。回想起来，我认为更可能的策略是将旧值添加到modelData.choices数组并从中移除新值。

此外，您还希望实现一个模型更改侦听器，该侦听器会在从模型中删除链接时发现，以便您可以将其选择添加回myDiagram.model.modelData.choices数组。在图表初始化中： $(go.Diagram, . . ., { "ModelChanged": function(e) { if (e.change === go.ChangedEvent.Remove && e.modelChange === "linkDataArray") { var linkdata = e.oldValue; var oldstr = linkdata.text; if (!oldstr) return; var choices = e.model.modelData.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); } } } })

链接文本的goJS下拉列表

1 个答案: