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Collapse all grouped rows at initial rendering in Vue Grid component

You can collapse all the grouped rows at initial rendering by using dataBound event with collapseAll method of the grid.

In the below demo, all the grouped rows are collapsed at initial rendering.

Source
Preview
app.vue
<template>
    <div id="app">
        <ejs-grid ref='grid' :dataSource='data' :allowGrouping='true' :groupSettings='groupOptions' :dataBound='dataBound' height='267px'>
            <e-columns>
                <e-column field='OrderID' headerText='Order ID' textAlign='Right' width=120></e-column>
                <e-column field='CustomerID' headerText='Customer ID' width=150></e-column>
                <e-column field='ShipCity' headerText='Ship City' width=150></e-column>
                <e-column field='ShipName' headerText='Ship Name' width=150></e-column>
            </e-columns>
        </ejs-grid>
    </div>
</template>
<script>
import Vue from "vue";
import { GridPlugin, Group } from "@syncfusion/ej2-vue-grids";
import { data } from './datasource.js';

Vue.use(GridPlugin);

var initial = true;
export default {
  data() {
    return {
      data: data,
      groupOptions: { columns: ['ShipCity'] }
    };
  },
  methods: {
    dataBound: function() {
        if(initial === true) {
            this.$refs.grid.ej2Instances.groupModule.collapseAll();
            initial = false;
        }
    }
  },
  provide: {
    grid: [Group]
  }
}
</script>
<style>
 @import "../node_modules/@syncfusion/ej2-vue-grids/styles/material.css";
</style>