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VUE--工作流--bpmn.js(一)

VUE--工作流--bpmn.js(一)

作者: 无剑_君 | 来源:发表于2019-11-01 07:05 被阅读0次

    一、bpmn.js 简介

      一个BPMN 2.0渲染工具包和Web建模器。使用JavaScript编写，在不需要后端服务器支持的前提下向现代浏览器内嵌入BPMN2.0流程图。这使得它很容易的嵌入到任何web应用中。这个库既可以是web查看器也可以是web建模器。使用查看器将BPMN2.0流程图嵌入到你的应用中并可以使用数据丰富你的流程图。使用建模器在你的应用内部创建BPMN2.0流程图。
    github地址：https://github.com/bpmn-io
    实例地址：https://bpmn.io/toolkit/bpmn-js/
    http://wkd.to8to.com/

    https://github.com/haoyanyu/vue-with-bpmn

    二、安装组件

    # bpmn组件
npm install --save vue-bpmn
# bpmn依赖
npm install --save bpmn-js
# 属性面板
npm install --save bpmn-js-properties-panel
# 扩展属性
npm install --save camunda-bpmn-moddle
# 导入bpmn组件所需
npm install --save raw-loader

    三、显示bpmn

    1. bpmn文件（/public/diagram.bpmn）
    <?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" targetNamespace="" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL http://www.omg.org/spec/BPMN/2.0/20100501/BPMN20.xsd">
  <collaboration id="sid-c0e745ff-361e-4afb-8c8d-2a1fc32b1424">
    <participant id="sid-87F4C1D6-25E1-4A45-9DA7-AD945993D06F" name="Customer" processRef="sid-C3803939-0872-457F-8336-EAE484DC4A04" />
  </collaboration>
  <process id="sid-C3803939-0872-457F-8336-EAE484DC4A04" name="Customer" processType="None" isClosed="false" isExecutable="false">
    <extensionElements />
    <laneSet id="sid-b167d0d7-e761-4636-9200-76b7f0e8e83a">
      <lane id="sid-57E4FE0D-18E4-478D-BC5D-B15164E93254">
        <flowNodeRef>sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26</flowNodeRef>
        <flowNodeRef>sid-E49425CF-8287-4798-B622-D2A7D78EF00B</flowNodeRef>
        <flowNodeRef>sid-D7F237E8-56D0-4283-A3CE-4F0EFE446138</flowNodeRef>
        <flowNodeRef>sid-E433566C-2289-4BEB-A19C-1697048900D2</flowNodeRef>
        <flowNodeRef>sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9</flowNodeRef>
        <flowNodeRef>SCAN_OK</flowNodeRef>
      </lane>
    </laneSet>
    <task id="sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26" name="Scan QR code">
      <incoming>sid-4DC479E5-5C20-4948-BCFC-9EC5E2F66D8D</incoming>
      <outgoing>sid-EE8A7BA0-5D66-4F8B-80E3-CC2751B3856A</outgoing>
    </task>
    <task id="sid-E49425CF-8287-4798-B622-D2A7D78EF00B" name="Open product information in mobile  app">
      <incoming>sid-8B820AF5-DC5C-4618-B854-E08B71FB55CB</incoming>
      <outgoing>sid-57EB1F24-BD94-479A-BF1F-57F1EAA19C6C</outgoing>
    </task>
    <startEvent id="sid-D7F237E8-56D0-4283-A3CE-4F0EFE446138" name="Notices&#10;QR code">
      <outgoing>sid-7B791A11-2F2E-4D80-AFB3-91A02CF2B4FD</outgoing>
    </startEvent>
    <endEvent id="sid-E433566C-2289-4BEB-A19C-1697048900D2" name="Is informed">
      <incoming>sid-57EB1F24-BD94-479A-BF1F-57F1EAA19C6C</incoming>
    </endEvent>
    <exclusiveGateway id="sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9">
      <incoming>sid-7B791A11-2F2E-4D80-AFB3-91A02CF2B4FD</incoming>
      <incoming>sid-337A23B9-A923-4CCE-B613-3E247B773CCE</incoming>
      <outgoing>sid-4DC479E5-5C20-4948-BCFC-9EC5E2F66D8D</outgoing>
    </exclusiveGateway>
    <exclusiveGateway id="SCAN_OK" name="Scan successful?&#10;">
      <incoming>sid-EE8A7BA0-5D66-4F8B-80E3-CC2751B3856A</incoming>
      <outgoing>sid-8B820AF5-DC5C-4618-B854-E08B71FB55CB</outgoing>
      <outgoing>sid-337A23B9-A923-4CCE-B613-3E247B773CCE</outgoing>
    </exclusiveGateway>
    <sequenceFlow id="sid-337A23B9-A923-4CCE-B613-3E247B773CCE" name="Yes" sourceRef="SCAN_OK" targetRef="sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9" />
    <sequenceFlow id="sid-4DC479E5-5C20-4948-BCFC-9EC5E2F66D8D" sourceRef="sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9" targetRef="sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26" />
    <sequenceFlow id="sid-8B820AF5-DC5C-4618-B854-E08B71FB55CB" name="No" sourceRef="SCAN_OK" targetRef="sid-E49425CF-8287-4798-B622-D2A7D78EF00B" />
    <sequenceFlow id="sid-57EB1F24-BD94-479A-BF1F-57F1EAA19C6C" sourceRef="sid-E49425CF-8287-4798-B622-D2A7D78EF00B" targetRef="sid-E433566C-2289-4BEB-A19C-1697048900D2" />
    <sequenceFlow id="sid-EE8A7BA0-5D66-4F8B-80E3-CC2751B3856A" sourceRef="sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26" targetRef="SCAN_OK" />
    <sequenceFlow id="sid-7B791A11-2F2E-4D80-AFB3-91A02CF2B4FD" sourceRef="sid-D7F237E8-56D0-4283-A3CE-4F0EFE446138" targetRef="sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9" />
  </process>
  <bpmndi:BPMNDiagram id="sid-74620812-92c4-44e5-949c-aa47393d3830">
    <bpmndi:BPMNPlane id="sid-cdcae759-2af7-4a6d-bd02-53f3352a731d" bpmnElement="sid-c0e745ff-361e-4afb-8c8d-2a1fc32b1424">
      <bpmndi:BPMNShape id="sid-87F4C1D6-25E1-4A45-9DA7-AD945993D06F_gui" bpmnElement="sid-87F4C1D6-25E1-4A45-9DA7-AD945993D06F" isHorizontal="true">
        <omgdc:Bounds x="83" y="105" width="933" height="250" />
        <bpmndi:BPMNLabel labelStyle="sid-84cb49fd-2f7c-44fb-8950-83c3fa153d3b">
          <omgdc:Bounds x="47.49999999999999" y="170.42857360839844" width="12.000000000000014" height="59.142852783203125" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="sid-57E4FE0D-18E4-478D-BC5D-B15164E93254_gui" bpmnElement="sid-57E4FE0D-18E4-478D-BC5D-B15164E93254" isHorizontal="true">
        <omgdc:Bounds x="113" y="105" width="903" height="250" />
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26_gui" bpmnElement="sid-52EB1772-F36E-433E-8F5B-D5DFD26E6F26">
        <omgdc:Bounds x="393" y="170" width="100" height="80" />
        <bpmndi:BPMNLabel labelStyle="sid-84cb49fd-2f7c-44fb-8950-83c3fa153d3b">
          <omgdc:Bounds x="360.5" y="172" width="84" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="sid-E49425CF-8287-4798-B622-D2A7D78EF00B_gui" bpmnElement="sid-E49425CF-8287-4798-B622-D2A7D78EF00B">
        <omgdc:Bounds x="728" y="170" width="100" height="80" />
        <bpmndi:BPMNLabel labelStyle="sid-84cb49fd-2f7c-44fb-8950-83c3fa153d3b">
          <omgdc:Bounds x="695.9285736083984" y="162" width="83.14285278320312" height="36" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNEdge id="sid-EE8A7BA0-5D66-4F8B-80E3-CC2751B3856A_gui" bpmnElement="sid-EE8A7BA0-5D66-4F8B-80E3-CC2751B3856A">
        <omgdi:waypoint x="493" y="210" />
        <omgdi:waypoint x="585" y="210" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="494" y="185" width="90" height="20" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="sid-8B820AF5-DC5C-4618-B854-E08B71FB55CB_gui" bpmnElement="sid-8B820AF5-DC5C-4618-B854-E08B71FB55CB">
        <omgdi:waypoint x="635" y="210" />
        <omgdi:waypoint x="728" y="210" />
        <bpmndi:BPMNLabel labelStyle="sid-e0502d32-f8d1-41cf-9c4a-cbb49fecf581">
          <omgdc:Bounds x="642" y="185" width="16" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="sid-7B791A11-2F2E-4D80-AFB3-91A02CF2B4FD_gui" bpmnElement="sid-7B791A11-2F2E-4D80-AFB3-91A02CF2B4FD">
        <omgdi:waypoint x="223" y="210" />
        <omgdi:waypoint x="275" y="210" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="204" y="185" width="90" height="20" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="sid-4DC479E5-5C20-4948-BCFC-9EC5E2F66D8D_gui" bpmnElement="sid-4DC479E5-5C20-4948-BCFC-9EC5E2F66D8D">
        <omgdi:waypoint x="325" y="210" />
        <omgdi:waypoint x="393" y="210" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="314" y="185" width="90" height="20" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="sid-57EB1F24-BD94-479A-BF1F-57F1EAA19C6C_gui" bpmnElement="sid-57EB1F24-BD94-479A-BF1F-57F1EAA19C6C">
        <omgdi:waypoint x="828" y="210" />
        <omgdi:waypoint x="901" y="210" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="820" y="185" width="90" height="20" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNEdge id="sid-337A23B9-A923-4CCE-B613-3E247B773CCE_gui" bpmnElement="sid-337A23B9-A923-4CCE-B613-3E247B773CCE">
        <omgdi:waypoint x="611" y="234" />
        <omgdi:waypoint x="610.5" y="299" />
        <omgdi:waypoint x="300.5" y="299" />
        <omgdi:waypoint x="301" y="234" />
        <bpmndi:BPMNLabel labelStyle="sid-e0502d32-f8d1-41cf-9c4a-cbb49fecf581">
          <omgdc:Bounds x="585" y="236" width="21" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNEdge>
      <bpmndi:BPMNShape id="StartEvent_0l6sgn0_di" bpmnElement="sid-D7F237E8-56D0-4283-A3CE-4F0EFE446138">
        <omgdc:Bounds x="187" y="192" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="182" y="229" width="46" height="24" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="EndEvent_0xwuvv5_di" bpmnElement="sid-E433566C-2289-4BEB-A19C-1697048900D2">
        <omgdc:Bounds x="901" y="192" width="36" height="36" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="892" y="231" width="56" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="ExclusiveGateway_1g0eih2_di" bpmnElement="sid-5134932A-1863-4FFA-BB3C-A4B4078B11A9" isMarkerVisible="true">
        <omgdc:Bounds x="275" y="185" width="50" height="50" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="210" y="160" width="90" height="12" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape id="ExclusiveGateway_0vci1x5_di" bpmnElement="SCAN_OK" isMarkerVisible="true">
        <omgdc:Bounds x="585" y="185" width="50" height="50" />
        <bpmndi:BPMNLabel>
          <omgdc:Bounds x="568" y="157" width="88" height="24" />
        </bpmndi:BPMNLabel>
      </bpmndi:BPMNShape>
    </bpmndi:BPMNPlane>
    <bpmndi:BPMNLabelStyle id="sid-e0502d32-f8d1-41cf-9c4a-cbb49fecf581">
      <omgdc:Font name="Arial" size="11" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false" />
    </bpmndi:BPMNLabelStyle>
    <bpmndi:BPMNLabelStyle id="sid-84cb49fd-2f7c-44fb-8950-83c3fa153d3b">
      <omgdc:Font name="Arial" size="12" isBold="false" isItalic="false" isUnderline="false" isStrikeThrough="false" />
    </bpmndi:BPMNLabelStyle>
  </bpmndi:BPMNDiagram>
</definitions>
    1. vue组件
    <template>
  <div class="diagram-container">
    <!-- 组件  url为文件路径-->
    <vue-bpmn
      url="/diagram.bpmn"
      v-on:error="handleError"
      v-on:shown="handleShown"
      v-on:loading="handleLoading"
    ></vue-bpmn>
  </div>
</template>

<script>
// 引入组件
import VueBpmn from "vue-bpmn";

export default {
  components: {
    VueBpmn
  },
  methods: {
    handleError: function(err) {
      console.error("failed to show diagram", err);
    },
    handleShown: function() {
      console.log("diagram shown");
    },
    handleLoading: function() {
      console.log("diagram loading");
    }
  }
};
</script>

<style scoped lang="scss">
.diagram-container {
  height: 300px;
}
</style>

    1. 显示结果


      显示结果

    四、整体框架

    1. 组件
      bpmn.vue
    <template>
  <div class="containers" ref="content">
    <!-- 画布 -->
    <div class="canvas" ref="canvas"></div>
    <!-- 面板 -->
    <div id="js-properties-panel" class="panel"></div>
    <!-- 下载图 -->
    <ul class="buttons">
      <li>下载</li>
      <li>
        <a ref="saveDiagram" href="javascript:" title="下载BPMN图">BPMN图</a>
      </li>
      <li>
        <a ref="saveSvg" href="javascript:" title="下载SVG图">SVG图</a>
      </li>
    </ul>
  </div>
</template>

<script>
// 引入组件
import VueBpmn from "vue-bpmn";
// 渲染器
import BpmnModeler from "bpmn-js/lib/Modeler";
// 左边工具栏
import propertiesPanelModule from "bpmn-js-properties-panel";
// 右边工具栏,扩展属性
import propertiesProviderModule from "bpmn-js-properties-panel/lib/provider/camunda";
import camundaModdleDescriptor from "camunda-bpmn-moddle/resources/camunda";

export default {
  components: {
    
  },
  data() {
    return {
      // bpmn建模器
      bpmnModeler: null,
      container: null,
      canvas: null,
      xmlStr: null,
      processName: ""
    };
  },
  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,
      // 添加控制板
      // propertiesPanel: {
      //   parent: '#js-properties-panel'
      // },
      additionalModules: [
        // 左边工具栏以及节点
        propertiesProviderModule,
        // 右边的工具栏
        propertiesPanelModule
      ],
      moddleExtensions: {
        camunda: camundaModdleDescriptor
      }
    });

     // 下载画图
    let _this = this
    // 获取a标签dom节点
    const downloadLink = this.$refs.saveDiagram
    const downloadSvgLink = this.$refs.saveSvg
    // 给图绑定事件，当图有发生改变就会触发这个事件
    this.bpmnModeler.on('commandStack.changed', function () {
      _this.saveSVG(function (err, svg) {
        _this.setEncoded(downloadSvgLink, 'diagram.svg', err ? null : svg)
      })
      // 保存图
      _this.saveDiagram(function (err, xml) {
        _this.setEncoded(downloadLink, 'diagram.bpmn', err ? null : xml)
      })
    })
    // 创建新图
    this.createNewDiagram(this.bpmnModeler)
    
  },
  methods: {
    createNewDiagram() {
      const bpmnXmlStr =
        '<?xml version="1.0" encoding="UTF-8"?>\n' +
        '<bpmn2:definitions xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:bpmn2="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd" id="sample-diagram" targetNamespace="http://bpmn.io/schema/bpmn">\n' +
        '  <bpmn2:process id="Process_1" isExecutable="false">\n' +
        '    <bpmn2:startEvent id="StartEvent_1"/>\n' +
        "  </bpmn2:process>\n" +
        '  <bpmndi:BPMNDiagram id="BPMNDiagram_1">\n' +
        '    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1">\n' +
        '      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="StartEvent_1">\n' +
        '        <dc:Bounds height="36.0" width="36.0" x="412.0" y="240.0"/>\n' +
        "      </bpmndi:BPMNShape>\n" +
        "    </bpmndi:BPMNPlane>\n" +
        "  </bpmndi:BPMNDiagram>\n" +
        "</bpmn2:definitions>";
      // 将字符串转换成图显示出来
      this.bpmnModeler.importXML(bpmnXmlStr, function(err) {
        if (err) {
          console.error(err);
        }
      });
    },
    // 下载为SVG格式,done是个函数，调用的时候传入的
    saveSVG(done) {
      // 把传入的done再传给bpmn原型的saveSVG函数调用
      this.bpmnModeler.saveSVG(done);
    },
    // 下载为SVG格式,done是个函数，调用的时候传入的
    saveDiagram(done) {
      // 把传入的done再传给bpmn原型的saveXML函数调用
      this.bpmnModeler.saveXML({ format: true }, function(err, xml) {
        done(err, xml);
      });
    },
    // 当图发生改变的时候会调用这个函数，这个data就是图的xml
    setEncoded(link, name, data) {
      // 把xml转换为URI，下载要用到的
      const encodedData = encodeURIComponent(data);
      // 获取到图的xml，保存就是把这个xml提交给后台
      this.xmlStr = data;
      // 下载图的具体操作,改变a的属性，className令a标签可点击，href令能下载，download是下载的文件的名字
      if (data) {
        link.className = "active";
        link.href = "data:application/bpmn20-xml;charset=UTF-8," + encodedData;
        link.download = name;
      }
    }
  }
};
</script>

<style scoped lang="scss">
// 最外层容器
.containers{
    position: absolute;
    background-color: #ffffff;
    width: 100%;
    height: 100%;
  }
  // 画布
  .canvas{
    width: 100%;
    height: 100%;
  }
  // 面板
  .panel{
    position: absolute;
    right: 0;
    top: 0;
    width: 300px;
  }
  // 下载按钮
  .buttons{
    position: absolute;
    left: 20px;
    bottom: 20px;
    &>li{
      display:inline-block;margin: 5px;
      &>a{
        color: #999;
        background: #eee;
        cursor: not-allowed;
        padding: 8px;
        border: 1px solid #ccc;
        &.active{
          color: #333;
          background: #fff;
          cursor: pointer;
        }
      }
    }
  }
</style>
    1. 样式
      main.js
    import './plugins/element.js'
/*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";

    1. 显示结果


      结果

    五、工具栏添加

    必须引入组件：

    // 左边工具栏
import propertiesPanelModule from "bpmn-js-properties-panel";
// 右边工具栏,扩展属性
import propertiesProviderModule from "bpmn-js-properties-panel/lib/provider/camunda";
import camundaModdleDescriptor from "camunda-bpmn-moddle/resources/camunda";
    1. 左边工具栏
     // 左边工具栏以及节点
  propertiesProviderModule,
    1. 右边工具栏
     // 右边的工具栏
propertiesPanelModule

    六、下载保存事件

        // 下载为SVG格式,done是个函数，调用的时候传入的
    saveSVG(done) {
      // 把传入的done再传给bpmn原型的saveSVG函数调用
      this.bpmnModeler.saveSVG(done);
    },
    // 下载为SVG格式,done是个函数，调用的时候传入的
    saveDiagram(done) {
      // 把传入的done再传给bpmn原型的saveXML函数调用
      this.bpmnModeler.saveXML({ format: true }, function(err, xml) {
        done(err, xml);
      });
    },

    七、获取自定义名称创建流程图

         // 从用户输入获取流程名称(页面一加载就要求输入名称)
      getProcessName() {
        this.$prompt('请输入流程名称', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消创建'
        }).then(({ value }) => {
          if(value === ''){
            this.$message({
              type: 'error',
              message: '流程名字不能为空'
            });
            this.getProcessName()
          }
          else {
            this.processName = value;
            // 创建新图
            this.createNewDiagram();
          }

        }).catch(() => {
          // this.back()
        });
      },

    八、保存图到后台

    1. html
      <el-button class="save" type="primary" @click="save" :disabled="!newDiagramXML">新增保存</el-button>
    1. js
        // 保存修改操作
    save() {
      // 传给后台的参数
      let params = {
        id: this.id,
        bpmnXml: this.xmlStr
      };
      // 调用API接口
      // saveBpmnData(params).then(res => {
      //   //          console.log(res)
      //   //          console.log(this.xmlStr)
      // });
    }

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