例子地址：GitHub - RubyLinT/bpmnActiviti

安装包：npm i

运行：npm run dev

访问http://localhost:8081/#/为官网提供的模板

访问http://localhost:8081/#/pro为自定义的模板

1.页面内容：

<template>
  <div class="containers" ref="content">
    <div class="canvas" ref="canvas"></div>
    <!-- panel为自定义属性面板，需要传入element，businessObject，moddle，modeling（后面会提及） -->
    <panel ref="panel" :element="element" :businessObject="businessObject" :moddle="moddle" :modeling="modeling"/>
  </div>
</template>

<script>
// 引入相关的依赖
import BpmnModeler from 'bpmn-js/lib/Modeler'
import activitiModdleDescriptor from './activiti.json'//要自定义的属性
import { getBusinessObject } from 'bpmn-js/lib/util/ModelUtil';
import panel from './panel'
export default {
  components:{panel},
  data () {
    return {
      businessObject:null,
      element:null,
      moddle:null,
      modeling:null,
      // bpmn建模器
      bpmnModeler: null,
      container: null,
      canvas: null,
    }
  },
  methods: {
    createNewDiagram () {
      let _this = this
      const bpmnXmlStr = `<?xml version="1.0" encoding="UTF-8"?>
        <bpmn:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" id="Definitions_0u4gsqp" targetNamespace="http://bpmn.io/schema/bpmn" exporter="bpmn-js (https://demo.bpmn.io)" exporterVersion="6.1.1">
          <bpmn:process id="Process_1d6bkiu" isExecutable="false" />
          <bpmndi:BPMNDiagram id="BPMNDiagram_1">
            <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1d6bkiu" />
          </bpmndi:BPMNDiagram>
        </bpmn:definitions>`
      // 将字符串转换成图显示出来
      this.bpmnModeler.importXML(bpmnXmlStr, function (err) {
        if (err) {
          console.error(err)
        }
        _this.moddle = _this.bpmnModeler.get('moddle')
        _this.modeling = _this.bpmnModeler.get('modeling')
      })
    },
  },
  mounted () {
    // 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

    // 建模，官方文档这里讲的很详细
    this.bpmnModeler = new BpmnModeler({
      container: canvas,
      moddleExtensions: {
        activiti: activitiModdleDescriptor
      }
    })

    // 下载画图
    let _this = this
    // 点击事件
    this.bpmnModeler.on('element.click',(event)=>{
      event.originalEvent.preventDefault();
      event.originalEvent.stopPropagation();
      _this.element = event.element
      _this.businessObject = getBusinessObject(_this.element);
      console.log('businessObject',_this.businessObject)
      _this.$nextTick(()=>{
        _this.$refs.panel.init()
      })
    })
    this.createNewDiagram(this.bpmnModeler)
  },
}
</script>

<style lang="scss">
  /*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';
  .containers{
    position: absolute;
    background-color: #ffffff;
    width: 100%;
    height: 90%;
  }
  .canvas{
    width: 100%;
    height: 100%;
  }
  .panel{
    position: absolute;
    right: 0;
    top: 0;
    width: 260px;
  }
</style>

2.panel.vue

<template>
  <div v-if="show" class="panelWrapper">
    <div class="panelHeader">{{form.id}}</div>
    <el-form class="panelForm" :model="form" label-position="top">
      <el-tabs v-model="activeName">
        <el-tab-pane label="普通" name="general">
          <el-form-item label="Id">
            <el-input size="mini" v-model="form.id" @change="v=>updateForm('id',v)"></el-input>
          </el-form-item>
          <el-form-item label="名称">
            <el-input size="mini" v-model="form.name" @change="v=>updateForm('name',v)"></el-input>
          </el-form-item>
        </el-tab-pane>
        <el-tab-pane v-if="formType.includes(businessObject.$type)" label="表单" name="form">
          <el-form-item label="表单Id">
            <el-input size="mini" v-model="form.formKey" @change="v=>updateForm('formKey',v)"></el-input>
          </el-form-item>
          <el-form-item label="表单字段">
            <el-button :disabled="!currentRow" class="tableBtn" type="text" @click="delFP"><i class="el-icon-remove"></i></el-button>
            <el-button class="tableBtn" type="text" @click="addFP"><i class="el-icon-circle-plus"></i></el-button>
            <el-table class="fpTable" border :show-header="false" :data="formProperty" style="width: 100%" highlight-current-row @current-change="handleCurrentChange">
              <el-table-column prop="id"></el-table-column>
            </el-table>
          </el-form-item>
          <template v-if="currentRow">
            <div class="title">字段属性</div>
            <el-form-item label="id">
              <el-input size="mini" v-model="currentRow.id" @change="v=>updateFormProperty('id',v)"></el-input>
            </el-form-item>
            <el-form-item label="类型">
              <el-select size="mini" style="width:100%" v-model="currentRow.type" placeholder="请选择" @change="v=>updateFormProperty('type',v)">
                <el-option v-for="item in options" :key="item"
                  :label="item" :value="item">
                </el-option>
              </el-select>
            </el-form-item>
            <el-form-item label="名称">
              <el-input size="mini" v-model="currentRow.name" @change="v=>updateFormProperty('name',v)"></el-input>
            </el-form-item>
            <el-form-item label="默认值">
              <el-input size="mini" v-model="currentRow.default" @change="v=>updateFormProperty('default',v)"></el-input>
            </el-form-item>
          </template>
        </el-tab-pane>
      </el-tabs>
    </el-form>
  </div>
</template>

<script>
export default {
  props:{
    element:{},
    businessObject:{
      default:function(){
        return {}
      },
    },
    modeling:{},
    moddle:{},
  },
  data(){
    return {
      show:false,
      activeName:'general',
      form:{},
      formProperty:[],
      currentRow :'',
      extensionElements:'',
      options:['long','string','boolean','date','enum','custom type'],
      formType:["bpmn:StartEvent","bpmn:UserTask"],
    }
  },
  methods:{
    // 初始化
    init(){
      this.show = true
      this.activeName='general'
      if(this.formType.includes(this.businessObject.$type)){
        this.extensionElements= this.businessObject.extensionElements || this.moddle.create('bpmn:ExtensionElements',{ values: [] })
        this.modeling.updateProperties(this.element, {
          extensionElements: this.extensionElements
        });
        this.formProperty = this.extensionElements.values
      }
      this.currentRow = ''
      this.form = this.$copy(this.businessObject)
      console.log('form',this.form)
      console.log('businessObject',this.businessObject)
      console.log('extensionElements',this.extensionElements)
      console.log('formProperty',this.formProperty)
    },
    //修改表单
    updateForm(type,v){
      this.modeling.updateProperties(this.element, {
        [type]: v
      });
      console.log(this.form,this.businessObject)
    },
    //修改表单字段
    updateFormProperty(type,v){
      this.modeling.updateProperties(this.element, {
        extensionElements: this.extensionElements
      });
      console.log(this.businessObject,this.extensionElements)
    },
    // 删除表单字段
    delFP(){
      let i = this.formProperty.findIndex(e=>e.id==this.currentRow.id)
      this.formProperty.splice(i,1)
      console.log(this.extensionElements)
      this.modeling.updateProperties(this.element, {
        extensionElements: this.extensionElements
      });
    },
    // 新增表单字段
    addFP(){
      //activiti:FormProperty里的FormProperty要与activiti.json保持
      let formProperty = this.moddle.create('activiti:FormProperty',{id: "FormProperty_"+this.random(100000,999999)});
      this.extensionElements.get('values').push(formProperty);
      this.modeling.updateProperties(this.element, {
        extensionElements: this.extensionElements
      });
      // this.formProperty.push({id: "FormProperty_"+this.random(100000,999999),$type: "activiti:formProperty"})
      console.log(this.formProperty,this.extensionElements)
    },
    // 获取随机数
    random(lower, upper) {
      return Math.floor(Math.random() * (upper - lower)) + lower;
    },
    // 选中表单字段行
    handleCurrentChange(row){
      this.currentRow  = row
    },
  },
}
</script>

<style lang="scss" scoped>
.panelWrapper{
  position: fixed;
  right:0;
  top:0;
  border-left:1px solid #ccc;
  height:100%;
  background-color: #f8f8f8;
  width:260px;
  .panelHeader{
    padding: 15px;
    padding-bottom: 5px;
    font-size: 120%;
    font-weight: bolder;
  }
  .panelForm{
    padding:15px;
  }
}
.tableBtn{
  padding:0;
  font-size: 18px;
}
.title {
  line-height: 32px;
  font-size: 16px;
}
</style>
<style lang="scss">
.panelForm{
  .el-form-item {
    margin-bottom: 10px;
  }
  .el-form-item__label{
    line-height: 20px;
    padding-bottom:0;
  }
}
.fpTable{
  height:150px;
  overflow-y:auto;
  td, th{
    padding:0;
    cursor: pointer;
  }
}
</style>

3.activiti.json：注意name大小写（FormProperty和formProperty将是两个不同的标签）

{
  "name": "Activiti",
  "uri": "http://some-company/schema/bpmn/activiti",
  "prefix": "activiti",
  "xml": {
    "tagAlias": "lowerCase"
  },
  "types": [
    {
      "name": "FormSupported",
      "isAbstract": true,//自定义属性
      "extends": [
        "bpmn:StartEvent",
        "bpmn:UserTask"
      ],
      "properties": [
        {
          "name": "formKey",
          "isAttr": true,
          "type": "String"
        }
      ]
    },
    {
      "name": "FormProperty",
      "superClass": [ "Element" ],//自定义组件
      "meta": {
        "allowedIn": [
          "bpmn:StartEvent",
          "bpmn:UserTask"
        ]
      },
      "properties": [
        {
          "name": "id",
          "type": "String",
          "isAttr": true
        },
        {
          "name": "name",
          "type": "String",
          "isAttr": true
        },
        {
          "name": "type",
          "type": "String",
          "isAttr": true
        },
        {
          "name": "default",
          "type": "String",
          "isAttr": true
        }
      ]
    }
  ],
  "emumerations": [],
  "associations": []
}