How to use vutify's custom sort?

Question

I'd like to use custom-sort in my data table. My goal is to sort the table DESC as opposed to the default ASC. But I don't know how.

This is the start of my data table component:

  <v-data-table
  :headers="headers"
  :items="acts"
  hide-actions
  class="elevation-1"
  >
  <template slot="items" slot-scope="props">

    <td>{{ props.item.id }}</td>
    <td>{{ props.item.name }}</td>
    <td class="text-xs-center">{{ props.item.provider.id }}</td>
    <td class="text-xs-center">{{ props.item.category.name }}</td>
    <td class="text-xs-center">{{ props.item.budget }}</td>
    <td class="text-xs-center">{{ props.item.location.name }}</td>
    <td class="text-xs-center">{{ props.item.deets }}</td>
    <td class="text-xs-center">{{ props.item.keeping_it_100 }}</td>
    <td class="text-xs-center"><img width="50" height="50" :src="props.item.inspiration.inspiration"></td>
    <td class="justify-center layout px-0">....

And this is the script I'm using:

<script>
  export default {
    data () {
      return {

        dialog: false,
        customerSort: {
          isDescending: true,// I tried this? as the kabab format throws an error
        },
        headers: [
            { text: 'ID', value: 'id'},
            { text: 'Name', value: 'name' },  
            { text: 'Provider', value: 'provider' },
            { text: 'Category', value: 'category' },
            { text: 'Budget', value: 'budget' },
            { text: 'Country', value: 'location', sortable: true },
            { text: 'Keeping it 100%', value: 'keeping_it_100', sortable: false },
            { text: 'deets', value: 'deets', sortable: false },
            { text: 'inspiration', value: 'inspiration', sortable: false },
            { text: 'Cover', value: 'cover', sortable: false },
            { text: 'Actions', value: 'actions', sortable: false }
        ],

According to docs it is a function prop. But I haven't found an example on how to pass it.

This is a screenshot of the function...

Answer 1

You can use a function like this-

customSort(items, index, isDesc) {
  items.sort((a, b) => {
    if (index === "date") {
      if (!isDesc) {
        return compare(a.date, b.date);
      } else {
        return compare(b.date, a.date);
      }
    }
  });
  return items;
}

Where the compare is a function which compares a.date and b.date and returns 1 or -1

isDesc is a variable passed by the table which tells in what order does the user want to sort it. If you want to sort in desc, just use !isDesc in the if-else condition

To use this in your template just use

<v-data-table
  :headers="headers"
  :items="Data"
  :custom-sort="customSort"
>
  <template slot="items" slot-scope="props">
    <td class="font-weight-black">{{ props.item.date }}</td>
    <td class="text-xs-right">{{ props.item.time }}</td>
    <td class="text-xs-right">{{ props.item.name }}</td>
  </template>
</v-data-table>

To make sure your other fields still work with the normal sort use

customSort(items, index, isDesc) {
      items.sort((a, b) => {
        if (index === "date") {
          if (!isDesc) {
            return dateHelp.compare(a.date, b.date);
          } else {
            return dateHelp.compare(b.date, a.date);
          }
        } else {
          if (!isDesc) {
            return a[index] < b[index] ? -1 : 1;
          } else {
            return b[index] < a[index] ? -1 : 1;
          }
        }
      });
      return items;
    }