How do I use "custom filter" prop in data tables in vuetify? or How do I create a custom filter to filter by headers?

Question

As of date of posting, I cannot find any documentation to use the "custom filter" prop in data tables.

I just want to create a custom filter to filter my data table by headers. I have a dropdown, and when user click on one of the options for the dropdown, it will filter the list for one specific header.

Example: Dropdown options: Food type: fruit, meat, vegetable

1. Bakchoi (vegetable)
2. Pork (meat)
3. Chicken Thigh (meat)
4. watermelon (fruit)

If I select dropdown as meat, it should only show me pork and chicken thigh.

Answer 1

Looking at the code on Github¹, it looks like the customFilter prop is used to overwrite the default method used to determine how the filter prop is applied to the items in the table.

The default customFilter method applies the filter function to each property name of each item object and filters out any items that don't include one property name that passes the filter:

customFilter: {
  type: Function,
  default: (items, search, filter) => {
    search = search.toString().toLowerCase()
    return items.filter(i => (
      Object.keys(i).some(j => filter(i[j], search))
    ))
  }
},

You might want to overwrite this function if you wanted to prevent any columns from being included in the filter or if there were specific rows that you always wanted to prevent from being filtered out.

You'll notice that the method also depends on the search prop, which must be a string.

---

All that said, you really don't need to use that prop for what you want to do. You should just make a computed property to filter the items based on your dropdown value and pass that computed property as the items prop.

Here's an example:

new Vue({
  el: '#app',
  data() {
    return {
      food: [
        { name: 'Bakchoi', type: 'vegetable', calories: 100 },
        { name: 'Pork', type: 'meat', calories: 200 },
        { name: 'Chicken Thigh', type: 'meat', calories: 300 },
        { name: 'Watermelon', type: 'fruit', calories: 10 },
      ],
      headers: [
        { text: 'Name', align: 'left', value: 'name' },
        { text: 'Food Type', align: 'left', value: 'type' }, 
        { text: 'Calories', align: 'left', value: 'calories' },
      ],
      foodType: null,
    };
  },
  computed: {
    filteredItems() {
      return this.food.filter((i) => {
        return !this.foodType || (i.type === this.foodType);
      })
    }
  }
})

<script src="https://unpkg.com/[email protected]/dist/vue.js"></script>
<script src="https://unpkg.com/[email protected]/dist/vuetify.js"></script>
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/vuetify.min.css">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700|Material+Icons">

<div id="app">
  <v-app>  
    <v-select 
      label="Food Type" 
      :items="['vegetable', 'meat', 'fruit']"
      v-model="foodType"
    ></v-select>
    
    <v-data-table 
      :headers="headers"
      :items="filteredItems"
      hide-actions
    >
      <template slot="items" scope="{ item }">
        <td>{{ item.name }}</td>
        <td>{{ item.type }}</td>
        <td>{{ item.calories }}</td>
      </template>
    </v-data-table>
  </v-app>
</div>

---

1. This answer was written when Vuetify was at v0.15.2. The source code for the VDataTable component at that version can be found here.