前言：业务需求需要在页面绘制流程图，之前后台的同事都是在eclipse画的流程图，为了方便点希望能在页面上画。
我用的是iview的ui框架，用原生的话记得把按钮等标签改改。
如果用的是element-ui的话，可以到这里看看，有中文文档和特别完善的bpmn+element-ui的项目：/weixin_43359503/article/details/113915655
在百度取经的过程中，发现右侧的工具栏有的内容很少，有的比较全。研究之后发现是安装版本的问题，为了满足需求，工具栏当然是越多越好！
注意：并不是最新版本的就是最好的，最新版本的反而功能更少
这是较新版本的：
这是特定版本的：
1、 先安装bpmn相关依赖
npm install bpmn-js@7.3.1
npm install bpmn-js-properties-panel@0.37.2
npm install camunda-bpmn-moddle@4.4.0
注意：版本不对会出现 报错 unhandled error in event listener TypeError: bo.get is not a function
2、准备相关js文件，汉化等，文件存放的位置和在vue文件中引入时需要根据你自己的实际情况来写。这三个文件我是放在同一目录下的
（1）translations.js
export default {// Labels'Activate the global connect tool': '激活全局连接工具','Append {type}': '添加 {type}','Add Lane above': '在上面添加道','Divide into two Lanes': '分割成两个道','Divide into three Lanes': '分割成三个道','Add Lane below': '在下面添加道','Append compensation activity': '追加补偿活动','Change type': '修改类型','Connect using Association': '使用关联连接','Connect using Sequence/MessageFlow or Association': '使用顺序/消息流或者关联连接','Connect using DataInputAssociation': '使用数据输入关联连接',Remove: '移除','Activate the hand tool': '激活抓手工具','Activate the lasso tool': '激活套索工具','Activate the create/remove space tool': '激活创建/删除空间工具','Create expanded SubProcess': '创建扩展子过程','Create IntermediateThrowEvent/BoundaryEvent': '创建中间抛出事件/边界事件','Create Pool/Participant': '创建池/参与者','Parallel Multi Instance': '并行多重事件','Sequential Multi Instance': '时序多重事件',DataObjectReference: '数据对象参考',DataStoreReference: '数据存储参考',Loop: '循环','Ad-hoc': '即席','Create {type}': '创建 {type}',Task: '任务','Send Task': '发送任务','Receive Task': '接收任务','User Task': '用户任务','Manual Task': '手工任务','Business Rule Task': '业务规则任务','Service Task': '服务任务','Script Task': '脚本任务','Call Activity': '调用活动','Sub Process (collapsed)': '子流程（折叠的）','Sub Process (expanded)': '子流程（展开的）','Start Event': '开始事件',StartEvent: '开始事件','Intermediate Throw Event': '中间事件','End Event': '结束事件',EndEvent: '结束事件','Create Gateway': '创建网关','Create Intermediate/Boundary Event': '创建中间/边界事件','Message Start Event': '消息开始事件','Timer Start Event': '定时开始事件','Conditional Start Event': '条件开始事件','Signal Start Event': '信号开始事件','Error Start Event': '错误开始事件','Escalation Start Event': '升级开始事件','Compensation Start Event': '补偿开始事件','Message Start Event (non-interrupting)': '消息开始事件（非中断）','Timer Start Event (non-interrupting)': '定时开始事件（非中断）','Conditional Start Event (non-interrupting)': '条件开始事件（非中断）','Signal Start Event (non-interrupting)': '信号开始事件（非中断）','Escalation Start Event (non-interrupting)': '升级开始事件（非中断）','Message Intermediate Catch Event': '消息中间捕获事件','Message Intermediate Throw Event': '消息中间抛出事件','Timer Intermediate Catch Event': '定时中间捕获事件','Escalation Intermediate Throw Event': '升级中间抛出事件','Conditional Intermediate Catch Event': '条件中间捕获事件','Link Intermediate Catch Event': '链接中间捕获事件','Link Intermediate Throw Event': '链接中间抛出事件','Compensation Intermediate Throw Event': '补偿中间抛出事件','Signal Intermediate Catch Event': '信号中间捕获事件','Signal Intermediate Throw Event': '信号中间抛出事件','Message End Event': '消息结束事件','Escalation End Event': '定时结束事件','Error End Event': '错误结束事件','Cancel End Event': '取消结束事件','Compensation End Event': '补偿结束事件','Signal End Event': '信号结束事件','Terminate End Event': '终止结束事件','Message Boundary Event': '消息边界事件','Message Boundary Event (non-interrupting)': '消息边界事件（非中断）','Timer Boundary Event': '定时边界事件','Timer Boundary Event (non-interrupting)': '定时边界事件（非中断）','Escalation Boundary Event': '升级边界事件','Escalation Boundary Event (non-interrupting)': '升级边界事件（非中断）','Conditional Boundary Event': '条件边界事件','Conditional Boundary Event (non-interrupting)': '条件边界事件（非中断）','Error Boundary Event': '错误边界事件','Cancel Boundary Event': '取消边界事件','Signal Boundary Event': '信号边界事件','Signal Boundary Event (non-interrupting)': '信号边界事件（非中断）','Compensation Boundary Event': '补偿边界事件','Exclusive Gateway': '互斥网关','Parallel Gateway': '并行网关','Inclusive Gateway': '相容网关','Complex Gateway': '复杂网关','Event based Gateway': '事件网关',Transaction: '转运','Sub Process': '子流程','Event Sub Process': '事件子流程','Collapsed Pool': '折叠池','Expanded Pool': '展开池',// Errors'no parent for {element} in {parent}': '在{parent}里，{element}没有父类','no shape type specified': '没有指定的形状类型','flow elements must be children of pools/participants': '流元素必须是池/参与者的子类','out of bounds release': 'out of bounds release','more than {count} child lanes': '子道大于{count} ','element required': '元素不能为空','diagram not part of bpmn:Definitions': '流程图不符合bpmn规范','no diagram to display': '没有可展示的流程图','no process or collaboration to display': '没有可展示的流程/协作','element {element} referenced by {referenced}#{property} not yet drawn':'由{referenced}#{property}引用的{element}元素仍未绘制','already rendered {element}': '{element} 已被渲染','failed to import {element}': '导入{element}失败',// 属性面板的参数Id: '编号',Name: '名称',General: '常规',Details: '详情','Message Name': '消息名称',Message: '消息',Initiator: '创建者','Asynchronous Continuations': '持续异步','Asynchronous Before': '异步前','Asynchronous After': '异步后','Job Configuration': '工作配置',Exclusive: '排除','Job Priority': '工作优先级','Retry Time Cycle': '重试时间周期',Documentation: '文档','Element Documentation': '元素文档','History Configuration': '历史配置','History Time To Live': '历史的生存时间',Forms: '表单','Form Key': '表单key','Form Fields': '表单字段','Business Key': '业务key','Form Field': '表单字段',ID: '编号',Type: '类型',Label: '名称','Default Value': '默认值',Validation: '校验','Add Constraint': '添加约束',Config: '配置',Properties: '属性','Add Property': '添加属性',Value: '值',Listeners: '监听器','Execution Listener': '执行监听','Event Type': '事件类型','Listener Type': '监听器类型','Java Class': 'Java类',Expression: '表达式','Must provide a value': '必须提供一个值','Delegate Expression': '代理表达式',Script: '脚本','Script Format': '脚本格式','Script Type': '脚本类型','Inline Script': '内联脚本','External Script': '外部脚本',Resource: '资源','Field Injection': '字段注入',Extensions: '扩展','Input/Output': '输入/输出','Input Parameters': '输入参数','Output Parameters': '输出参数',Parameters: '参数','Output Parameter': '输出参数','Timer Definition Type': '定时器定义类型','Timer Definition': '定时器定义',Date: '日期',Duration: '持续',Cycle: '循环',Signal: '信号','Signal Name': '信号名称',Escalation: '升级',Error: '错误','Link Name': '链接名称',Condition: '条件名称','Variable Name': '变量名称','Variable Event': '变量事件','Specify more than one variable change event as a comma separated list.':'多个变量事件以逗号隔开','Wait for Completion': '等待完成','Activity Ref': '活动参考','Version Tag': '版本标签',Executable: '可执行文件','External Task Configuration': '扩展任务配置','Task Priority': '任务优先级',External: '外部',Connector: '连接器','Must configure Connector': '必须配置连接器','Connector Id': '连接器编号',Implementation: '实现方式','Field Injections': '字段注入',Fields: '字段','Result Variable': '结果变量',Topic: '主题','Configure Connector': '配置连接器','Input Parameter': '输入参数',Assignee: '代理人','Candidate Users': '候选用户','Candidate Groups': '候选组','Due Date': '到期时间','Follow Up Date': '跟踪日期','Specify more than one group as a comma separated list.': '多个用户使用逗号隔开',Priority: '优先级',// eslint-disable-next-line no-template-curly-in-string'The follow up date as an EL expression (e.g. ${someDate} or an ISO date (e.g. -06-26T09:54:00)':'跟踪日期必须符合EL表达式，如： ${someDate} ,或者一个ISO标准日期，如：-06-26T09:54:00',// eslint-disable-next-line no-template-curly-in-string'The due date as an EL expression (e.g. ${someDate} or an ISO date (e.g. -06-26T09:54:00)':'跟踪日期必须符合EL表达式，如： ${someDate} ,或者一个ISO标准日期，如：-06-26T09:54:00',Variables: '变量','Candidate Starter Users': '选择启动候选人','Candidate Starter Configuration': '候选人启动器配置','Candidate Starter Groups': '候选人启动组','This maps to the process definition key.': '编号将映射到流程主键.',save: '保存',Tools: '工具',FlowGateway: '流程网关',ProcessControl: '流程节点','Create StartEvent': '开始节点','Create EndEvent': '结束节点','Create ExclusiveGateway': '互斥网关','Create ParallelGateway': '并行网关','Create Task': '任务节点','Create UserTask': '用户任务节点','Condition Type': '条件类型',// 左侧工具箱补充汉化项 热水.1.12'Create Group': '创建组','Create DataObjectReference': '创建数据对象引用','Create DataStoreReference': '创建数据存储引用',// 节点添加Pad 补充汉化 热水.1.12'Append EndEvent': '追加结束事件节点','Append Gateway': '追加网关节点','Append UserTask': '追加用户任务节点','Append Intermediate/Boundary Event': '追加中间或边界事件','Append TextAnnotation': '追加文本批注' // 此句要有效，必须在CustomContexPadProvide给此节点增加一个translate('Append TextAnnotation')}
(2)customTranslate.js
import translations from './translations';export default function customTranslate(template, replacements) {undefinedreplacements = replacements || {};// Translatetemplate = translations[template] || template;// Replacereturn template.replace(/{([^}]+)}/g, function(_, key) {undefinedreturn replacements[key] || '{' + key + '}';});}
（3）生成流程图的默认模板 defaultXmlStr.js
export var xmlStr = `<?xml version="1.0" encoding="UTF-8"?><bpmn2:definitions xmlns:xsi="/2001/XMLSchema-instance"xmlns:bpmn2="/spec/BPMN/0524/MODEL"xmlns:bpmndi="/spec/BPMN/0524/DI"xmlns:dc="/spec/DD/0524/DC"id="sample-diagram"targetNamespace="http://bpmn.io/schema/bpmn"xsi:schemaLocation="/spec/BPMN/0524/MODEL BPMN20.xsd"><bpmn2:process id="Process_1" isExecutable="false"><bpmn2:startEvent id="StartEvent_1" /></bpmn2:process><bpmndi:BPMNDiagram id="BPMNDiagram_1"><bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1"><bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1"><dc:Bounds x="192" y="82" width="36" height="36" /></bpmndi:BPMNShape></bpmndi:BPMNPlane></bpmndi:BPMNDiagram></bpmn2:definitions>`
（4）vue文件
<template><div class="containers" ref="content"><div class="button-row"><Upload :file-list="uploadBpmnFileList" :before-upload="beforeUpload" action=""><Button class="button" type="warning">导入BPMN</Button></Upload><Button @click="downloadBpmn" class="button" type="success">保存BPMN</Button><!-- <Button @click="downloadXml" class="button" icon="md-download" type="success">保存XML</Button> --><Button @click="downloadSvg" class="button" type="success">保存SVG</Button><Button @click="showXml" class="button" type="primary">预览xml</Button><ButtonGroup class="button"><Button @click="handlerUndo">撤销</Button><Button @click="handlerRedo">恢复</Button></ButtonGroup><ButtonGroup><Button @click="handlerZoom(0.1)">放大</Button><Button @click="handlerZoom(-0.1)">缩小</Button><Button @click="handlerZoom(0)">还原</Button></ButtonGroup><a hidden ref="downloadLink"></a></div><div class="canvas" ref="canvas"></div><div id="js-properties-panel" class="panel"></div><Modal title="预览" v-model="showXmlModal" fullscreen :mask-closable="false"><!-- <xmp><div v-text="xmlData"></div></xmp> --><pre><div v-text="xmlData"></div></pre><div slot="footer"></div></Modal></div></template><script>import BpmnModeler from 'bpmn-js/lib/Modeler'import propertiesPanelModule from 'bpmn-js-properties-panel'import propertiesProviderModule from 'bpmn-js-properties-panel/lib/provider/camunda'import camundaModdleDescriptor from 'camunda-bpmn-moddle/resources/camunda'// BPMN国际化import customTranslate from '@/lib/customTranslate';// 自定义汉化模块var customTranslateModule = {translate: ['value', customTranslate]};import {xmlStr} from '@/lib/defaultXmlStr';export default {components: {},data() {return {bpmnModeler: null,container: null,canvas: null,uploadBpmnFileList: [],scale: 1,showXmlModal: false,xmlData: "",}},created() {},mounted() {this.init();// 删除 bpmn logo bpmn.io官方要求不给删或者隐藏，否则侵权 内部使用// const bjsIoLogo = document.querySelector('.bjs-powered-by')// while (bjsIoLogo.firstChild) {// bjsIoLogo.removeChild(bjsIoLogo.firstChild)}},methods: {/*** 初始化流程设计器对象* @returns {Promise<void>}*/async init() {// 获取到属性ref为“content”的dom节点this.container = this.$refs.content// 获取到属性ref为“canvas”的dom节点const canvas = this.$refs.canvas// 创建BpmnModelerthis.bpmnModeler = new BpmnModeler({container: canvas,// 加入工具栏支持propertiesPanel: {parent: '#js-properties-panel'},additionalModules: [// 左边工具栏以及节点propertiesProviderModule,// 右边的工具栏propertiesPanelModule,// 国际化customTranslateModule,// camundaModdleDescriptor],moddleExtensions: {// bpmn: bpmnModdleDescriptorcamunda: camundaModdleDescriptor}});// 创建新流程await this.createNewDiagram(xmlStr);},/*** 创建新流程* @param bpmn BPMN流程XML报文* @returns {Promise<void>}*/async createNewDiagram(bpmn) {// 将字符串转换成图显示出来;this.bpmnModeler.importXML(bpmn, err => {if (err) {console.log('err', err);this.$Message.error('打开模型出错,请确认该模型符合Bpmn2.0规范');} else {console.log("成功导入模型");}});},handlerRedo() {this.bpmnModeler.get("commandStack").redo();},handlerUndo() {this.bpmnModeler.get("commandStack").undo();},handlerZoom(radio) {const newScale = !radio ? 1.0 : this.scale + radio;this.bpmnModeler.get("canvas").zoom(newScale);this.scale = newScale;},beforeUpload(file) {// this.uploadBpmnFileList = [];this.openBpmn(file);return false;},openBpmn(file) {const reader = new FileReader();// 读取File对象中的文本信息，编码格式为UTF-8reader.readAsText(file, "utf-8");reader.onload = () => {// 读取完毕后将文本信息导入到Bpmn建模器this.createNewDiagram(reader.result);};return false;},downloadBpmn() {this.bpmnModeler.saveXML({format: true}, (err, xml) => {if (!err) {// 获取文件名const name = `${this.getFilename(xml)}.bpmn`;// 将文件名以及数据交给下载方法this.download({name: name,data: xml});}});},downloadXml() {this.bpmnModeler.saveXML({format: true}, (err, xml) => {if (!err) {// 获取文件名const name = `${this.getFilename(xml)}.xml`;// 将文件名以及数据交给下载方法this.download({name: name,data: xml});}});},downloadSvg() {this.bpmnModeler.saveXML({format: true}, (err, xml) => {if (!err) {// 获取文件名const name = `${this.getFilename(xml)}.svg`;// 从建模器画布中提取svg图形标签let context = "";const djsGroupAll = this.$refs.canvas.querySelectorAll(".djs-group");for (let item of djsGroupAll) {context += item.innerHTML;}// 获取svg的基本数据，长宽高const viewport = this.$refs.canvas.querySelector(".viewport").getBBox();// 将标签和数据拼接成一个完整正常的svg图形const svg = `<svgxmlns="/2000/svg"xmlns:xlink="/1999/xlink"width="${viewport.width}"height="${viewport.height}"viewBox="${viewport.x} ${viewport.y} ${viewport.width} ${viewport.height}"version="1.1">${context}</svg>`;// 将文件名以及数据交给下载方法this.download({name: name,data: svg});}});},download({name = "diagram.bpmn",data}) {// 这里就获取到了之前设置的隐藏链接const downloadLink = this.$refs.downloadLink;// 把输就转换为URI，下载要用到的const encodedData = encodeURIComponent(data);if (data) {// 将数据给到链接downloadLink.href = "data:application/bpmn20-xml;charset=UTF-8," + encodedData;// 设置文件名downloadLink.download = name;// 触发点击事件开始下载downloadLink.click();}},getFilename(xml) {let start = xml.indexOf("process");let filename = xml.substr(start, xml.indexOf(">"));filename = filename.substr(filename.indexOf("id") + 4);filename = filename.substr(0, filename.indexOf('"'));return filename;},showXml() {this.bpmnModeler.saveXML({ format: true }).then(({ xml }) => {this.xmlData = xml;this.showXmlModal = true;});},},computed: {}}</script><style lang="less" scoped>// 左边工具栏以及编辑节点的样式@import '~bpmn-js/dist/assets/diagram-js.css';@import '~bpmn-js/dist/assets/bpmn-font/css/bpmn.css';@import '~bpmn-js/dist/assets/bpmn-font/css/bpmn-codes.css';@import '~bpmn-js/dist/assets/bpmn-font/css/bpmn-embedded.css';// 右边工具栏样式@import '~bpmn-js-properties-panel/dist/assets/bpmn-js-properties-panel.css';.containers {position: absolute;background-color: #ffffff;width: 100%;height: 100vh;padding: 5px;}.canvas {width: 100%;height: 100%;}.panel {position: absolute;right: 0;top: 0;width: 300px;}.button-row {margin-top: 10px;display: flex;flex-direction: row;justify-content: center;.button {margin-right: 10px;font-weight: bolder;}}</style>
到此就可以看到流程图制作的页面了，在样式上还存在一些问题，比如用滚轮上下滚动的话可以无限滑动，得滑动滚动条才行。
