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);

}