expand collapse all groups in v-data-table vuetify 3

Lussy04

2 min read

·

24-01-2025

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The v-data-table component in Vuetify 3 offers powerful features for displaying and managing tabular data. One common requirement is the ability to expand and collapse all groups simultaneously. Unfortunately, Vuetify doesn't provide a built-in method for this. However, we can achieve this functionality with a little custom logic. This article demonstrates how to efficiently expand and collapse all groups in your v-data-table.

Understanding the Challenge

The v-data-table uses a expand property on each row to control its expansion state. To expand/collapse all groups, we need to iterate through all rows and modify this property. The key is efficiently managing this process and keeping the UI responsive.

Implementing the Solution

This solution leverages a computed property to track the overall expansion state and a method to toggle it. This approach keeps the logic concise and manageable.

<template>
  <v-data-table :headers="headers" :items="items" :items-per-page="10" class="elevation-1" show-expand>
    <template v-slot:item.actions="{ item }">
      <v-btn icon small @click="toggleRow(item)">
        <v-icon>{{ item.expanded ? 'mdi-chevron-up' : 'mdi-chevron-down' }}</v-icon>
      </v-btn>
    </template>
    <template v-slot:expanded-item="{ item }">
      <v-card flat>
        <v-card-text>
          Expanded content for {{ item.name }}
        </v-card-text>
      </v-card>
    </template>
  </v-data-table>
  <v-btn color="primary" @click="toggleAll">Expand/Collapse All</v-btn>
</template>

<script>
import { ref, computed } from 'vue';

export default {
  setup() {
    const headers = [
      { text: 'Name', value: 'name', sortable: false },
      { text: 'Actions', value: 'actions', sortable: false },
    ];

    const items = ref([
      { name: 'Group 1', expanded: false, children: [{ name: 'Child 1' }, { name: 'Child 2' }] },
      { name: 'Group 2', expanded: false, children: [{ name: 'Child 3' }] },
      { name: 'Group 3', expanded: false, children: [{ name: 'Child 4' }, { name: 'Child 5' }, { name: 'Child 6' }] },
    ]);

    const allExpanded = computed({
      get: () => items.value.every(item => item.expanded),
      set: (value) => {
        items.value.forEach(item => (item.expanded = value));
      },
    });

    const toggleAll = () => {
      allExpanded.value = !allExpanded.value;
    };

    const toggleRow = (item) => {
      item.expanded = !item.expanded;
    };


    return { headers, items, toggleAll, toggleRow, allExpanded };
  },
};
</script>

This code creates a button that toggles the allExpanded computed property. This property, in turn, iterates through all items and sets their expanded property accordingly. The toggleRow function handles individual row expansion/collapse. Remember to adjust the items data to match your own data structure. The expanded property must be present on each item object.

Enhancing the User Experience

Consider these enhancements for a better user experience:

• Visual Feedback: Update the button text to reflect the current state ("Expand All" or "Collapse All").
• Animation: Add a smooth transition to the expansion/collapse animation for a more polished look. You can achieve this using CSS transitions or animations.
• Error Handling: Implement error handling to gracefully handle cases where the data structure is unexpected.
• Accessibility: Ensure the functionality is accessible to users with disabilities. Proper ARIA attributes should be used.

Conclusion

Expanding and collapsing all groups in Vuetify 3's v-data-table requires a custom solution. By using a computed property and a simple method, we can efficiently manage the expansion state of all rows. Remember to consider enhancements to improve the user experience and ensure accessibility. This technique provides a clean and effective method for managing grouped data within your Vuetify applications.