使用jsPlumb插件实现动态连线功能

这周去看了两天的羽毛球亚锦赛，工作有提前晚上加班做一些，但是技术文章却拉下了。
这段时间一直在寻找可以实现前端元素动态连线的功能，找了好几个库，考虑过用d3或者原生svg和canvas来实现，最后和同项目的同事商量后决定使用jsPlumb插件库来做。
jsPlumb是一个强大的JavaScript连线库，它可以将html中的元素用箭头、曲线、直线等连接起来，适用于开发Web上的图表、建模工具等，其实jsPlumb可能主要是用来做流程图的，它在实现这方面的功能上非常强大，我在项目中只使用了它少部分功能，来实现项目中连线的效果。

 

连线效果

initJSPlumb = () => {
    this.jsp = jsPlumb.getInstance({
        //锚点位置；对任何没有声明描点的Endpoint设置锚点，用于source及target节点
        Anchor: ["Right", "Left"],
        Anchors: ["Right", "Left"],  //连线的source和target Anchor
        ConnectionsDetachable: false, //连线是否可用鼠标分离
        ConnectionOverlays: [  //连线的叠加组件，如箭头、标签
            ["Arrow", {  //箭头参数设置
                location: 1,
                visible: true,
                width: 11,
                length: 11,
                id: "ARROW",
                events: {
                    click: function () {
                    }
                }
            }],
            ["Label", {  //标签参数设置
                location: 0.1,
                id: "label",
                cssClass: "aLabel", //hover时label的样式名
                events: {
                    tap: function () {
                    }
                },
                visible: true
            }]
        ],
        Connector: "Bezier", //连线的类型，流程图(Flowchart)、贝塞尔曲线等
        //父级元素id；假如页面元素所在上层不同，最外层父级一定要设置
        Container: "module",
        //如果请求不存在的Anchor、Endpoint或Connector，是否抛异常
        DoNotThrowErrors: false,
        //通过jsPlumb.draggable拖拽元素时的默认参数设置
        DragOptions: {cursor: 'pointer', zIndex: 2000},
        DropOptions: {}, //target Endpoint放置时的默认参数设置
        Endpoint: "Dot", //端点（锚点）的样式声明
         //用jsPlumb.connect创建连接时，source端点和target端点的样式设置
        Endpoints: [null, null],
        EndpointOverlays: [], //端点的叠加物
        //端点的默认样式
        EndpointStyle: {fill: 'transparent', stroke: '#1565C0', radius: 4,
            strokeWidth: 1},
        EndpointStyles: [null, null], //连线的source和target端点的样式
        //端点hover时的样式
        EndpointHoverStyle: {fill: '#1565C0', stroke: '#1565C0', radius: 4,
            strokeWidth: 1},
        //连线的source和target端点hover时的样式
        EndpointHoverStyles: [null, null],
        //连线hover时的样式
        HoverPaintStyle: {stroke: '#1565C0', strokeWidth: 3},
        LabelStyle: {color: "black"}, //标签的默认样式，用css写法。
        LogEnabled: false, //是否开启jsPlumb内部日志
        Overlays: [], //连线和端点的叠加物
        MaxConnections: 10, //端点支持的最大连接数
        //连线样式
        PaintStyle: {stroke: '#1565C0', strokeWidth: 1, joinstyle: 'round'},
        ReattachConnections: true, //是否重新连接使用鼠标分离的线?
        RenderMode: "svg", //默认渲染模式
        Scope: "jsPlumb_DefaultScope", //范围，具有相同scope的点才可连接
        reattach: true,
    })
    this.jsp.bind('beforeDrop', this.jspBeforeDrop)
}

以上是初始化jsPlumb对象的函数。
接下来获取数据，加载页面的系统和编制模块。

fetchDataForLeft(data) {
    var jsonString_left = '[{"module_name":"crm系统","module_id":"A","nodes":[{"id":"A-1","text":"开始","position":"left"},{"id":"A-2","text":"过程","position":"left"},{"id":"A-3","text":"过程ing","position":"left"}]},{"module_name":"财务系统","module_id":"B","nodes":[{"id":"B-1","text":"开始","position":"left"}]}]';
    var jsonString_right = '[{"module_name":"年度预算编制","module_id":"C","nodes":[{"id":"C-1","text":"结束","position":"right"}]},{"module_name":"营收编制","module_id":"D","nodes":[{"id":"D-1","text":"结束","position":"right"}]}]';
    // var nodeData_left = JSON.parse(jsonString_left);
    //[{"entity":null,"id":"934D62BD0F8249B09F29EC9FA051E390","code":"1","name":"CRM????","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"81ABCD2890E2460B90A9B8A0ACE3FABD","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"9AE1B07886E54F3DB0082D46392DE774","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"E6D29376AC86455DBC3518D12F28C5B0","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null}]
    var nodeData_left = data;
    this.setState({
        nodes_left: nodeData_left,
    })
    //绘制左边点
    nodeData_left.map((node, index) => {
        this.setState({datas: node, nodes: node.fromModelList}, () => {
            this.initNodes(this.refs.nodes_left[index], 'left');
            // this.initEdges(nodeData.edges);
        });
    })
    //绘制右边点
    // nodeData_right.map((node, index) => {
    //     this.setState({data_right: node, node_right: node.toModelList}, () => {
    //         this.initNodes(this.refs.nodes_right[index], 'right');
    //         // this.initEdges(nodeData.edges);
    //     });
    // })
}
fetchDataForRight(data){
    var jsonString_left = '[{"module_name":"crm系统","module_id":"A","nodes":[{"id":"A-1","text":"开始","position":"left"},{"id":"A-2","text":"过程","position":"left"},{"id":"A-3","text":"过程ing","position":"left"}]},{"module_name":"财务系统","module_id":"B","nodes":[{"id":"B-1","text":"开始","position":"left"}]}]';
    var jsonString_right = '[{"module_name":"年度预算编制","module_id":"C","nodes":[{"id":"C-1","text":"结束","position":"right"}]},{"module_name":"营收编制","module_id":"D","nodes":[{"id":"D-1","text":"结束","position":"right"}]}]';
    // var nodeData_left = JSON.parse(jsonString_left);
    //[{"entity":null,"id":"934D62BD0F8249B09F29EC9FA051E390","code":"1","name":"CRM????","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"81ABCD2890E2460B90A9B8A0ACE3FABD","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"9AE1B07886E54F3DB0082D46392DE774","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null},{"entity":null,"id":"E6D29376AC86455DBC3518D12F28C5B0","code":null,"name":"CRM系统","systemType":null,"databaseType":null,"hostName":null,"databaseaName":null,"userName":null,"password":null,"created":null,"modified":null}]
    var nodeData_right = data;
    this.setState({
        nodes_right: nodeData_right
    })
    //绘制右边点
    nodeData_right.map((node, index) => {
        this.setState({data_right: node, node_right: node.toModelList}, () => {
            this.initNodes(this.refs.nodes_right[index], 'right');
            // this.initEdges(nodeData.edges);
        });
    })
}

初始化连接锚点

initNodes = (node, position) => {
    this.jsp.setSuspendDrawing(true);
    if (position === "left") {
        DynamicAnchors.map(anchor => this.rjsp.addEndpoint(node, anEndpoint, {anchor: "Right"}));
    } else {
        DynamicAnchors_Right.map(anchor => this.rjsp.addEndpoint(node, anEndpoint, {anchor: "Left"}));
    }
    this.rjsp.setSuspendDrawing(false, true);
}

//自动连线

initEdges = (edges) => {
    this.rjsp.setSuspendDrawing(true);
    edges.map(edge => {
        this.jsp.connect(edge, Common);
    })
    this.jsp.setSuspendDrawing(false, true);
}