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Customize Accordion expand or collapse animation behavior in Vue Accordion component

Accordion component supports customizing the expand or collapse animation action behavior. You can manually change the expand animation action performed after the collapse animation operation performed on already expand pane when the expand icons are clicked.

By default, the Accordion component pane is expanded or collapsed, when click the expand or collapse icon. It is not affected on already expand pane.

The following sample demonstrates, how to expand the collapsed Accordion item after collapse animation performed on the expanded Accordion item using created, expanding, and expanded event. In the Expanding event, get the previously expanded item index and prevent the expanding behavior using args.cancel option. Expand the Accordion item dynamically based on specifying the index value using the expandItem public method and expanded event.

Source
Preview
app.vue
<template>
    <div id="app">
    <ejs-accordion ref="acrdnInstance" expandMode='Single' :expanding="expanding" :expanded="expanded" :created="created" >
      <e-accordionitems>
        <e-accordionitem header='ASP.NET' :content='content0'></e-accordionitem>
        <e-accordionitem header='ASP.NET MVC' :content='content1'></e-accordionitem>
        <e-accordionitem header='JavaScript' :content='content2'></e-accordionitem>
      </e-accordionitems>
    </ejs-accordion>
  </div>
</template>
<script>
import Vue from 'vue';
import { AccordionPlugin } from '@syncfusion/ej2-vue-navigations';
import { ExpandEventArgs, Accordion } from '@syncfusion/ej2-navigations';

Vue.use(AccordionPlugin);
export default {  
  name: 'app',
  data: function() {
    return {
        content0: 'ASP.NET is an open-source server-side web application framework designed for web development to produce ' +
        'dynamic web pages. It was developed by Microsoft to allow programmers to build dynamic web sites, web applications ' +
        'and web services. It was first released in January 2002 with version 1.0 of the .NET Framework, and is the successor ' +
        'to Microsoft\'\s Active Server Pages (ASP) technology. ASP.NET is built on the Common Language Runtime (CLR), allowing ' +
        'programmers to write ASP.NET code using any supported .NET language. The ASP.NET SOAP extension framework allows ' +
        'ASP.NET components to process SOAP messages.',

         content1: 'The ASP.NET MVC is a web application framework developed by Microsoft, which implements the ' +
        'model–view–controller (MVC) pattern. It is open-source software, apart from the ASP.NET Web Forms component which is ' +
        'proprietary. In the later versions of ASP.NET, ASP.NET MVC, ASP.NET Web API, and ASP.NET Web Pages (a platform using ' +
        'only Razor pages) will merge into a unified MVC 6.The project is called ASP.NET vNext.',

         content2: 'JavaScript (JS) is an interpreted computer programming language. It was originally implemented as ' +
        'part of web browsers so that client-side scripts could interact with the user, control the browser, communicate ' +
        'asynchronously, and alter the document content that was displayed.[5] More recently, however, it has become common in ' +
        'both game development and the creation of desktop applications.',
    };
  },
  mounted: function() {
    this.initialLoad = true;
    this.isCollapsed = false;
    this.expandIndex;
  },
  methods: {
    expanded: function (e) {
      var obj = this.$refs.acrdnInstance.ej2Instances;
      if (!e.isExpanded && !this.initialLoad && this.isCollapsed) {
           obj.expandItem(true, this.expandIndex);
           this.isCollapsed = false;
      }
    }
    expanding: function (e) {
      var obj = this.$refs.acrdnInstance.ej2Instances;
      if (e.isExpanded && !this.initialLoad && !this.isCollapsed) {
            e.cancel = true;
            this.expandIndex = obj.items.indexOf(e.item);
            this.isCollapsed = true;
      }
    }
    created: function (e) {
        this.initialLoad = false;
    }
   }
}
</script>
<style>
  @import "../../node_modules/@syncfusion/ej2-base/styles/material.css";
  @import "../../node_modules/@syncfusion/ej2-vue-navigations/styles/material.css";
</style>