How can you customize all elements in a table header? - vuetify.js

Question

Looking at the examples on this page, what is the way to apply toUpper to all header items? It looks too clumsy having to do it one-by-one (i.e. header.calories, header.fat...) and I can't figure out how a v-for can wrap around the template/v-slot element. Is the only way to use a 'div' and flex it horizontally?
<template>
<v-data-table
:headers="headers"
:items="desserts"
class="elevation-1"
>
<template v-slot:header.name="{ header }">
{{ header.text.toUpperCase() }}
</template>
</v-data-table>
</template>
<script>
export default {
data: () => ({
headers: [
{
text: 'Dessert (100g serving)',
align: 'start',
value: 'name',
},
{ text: 'Calories', value: 'calories' },
{ text: 'Fat (g)', value: 'fat' },
{ text: 'Carbs (g)', value: 'carbs' },
{ text: 'Protein (g)', value: 'protein' },
{ text: 'Iron (%)', value: 'iron' },
],
desserts: [
{
name: 'Frozen Yogurt',
calories: 159,
fat: 6.0,
carbs: 24,
protein: 4.0,
iron: '1%',
},
....// rest of it
],
}),
}
</script>

Answer 1

It is possible to loop the headers to make all capitalize
here is the working codepen: https://codepen.io/chansv/pen/gOaRWQb?editors=1010
<div id="app">
<v-app id="inspire">
<v-data-table
:headers="headers"
:items="desserts"
class="elevation-1"
hide-default-header
>
<template v-slot:header="{ props }">
<th v-for="head in props.headers">{{ head.text.toUpperCase() }}
</template>
</v-data-table>
</v-app>
</div>
new Vue({
el: '#app',
vuetify: new Vuetify(),
data: () => ({
headers: [
{
text: 'Dessert (100g serving)',
align: 'start',
value: 'name',
},
{ text: 'Calories', value: 'calories' },
{ text: 'Fat (g)', value: 'fat' },
{ text: 'Carbs (g)', value: 'carbs' },
{ text: 'Protein (g)', value: 'protein' },
{ text: 'Iron (%)', value: 'iron' },
],
desserts: [
{
name: 'Frozen Yogurt',
calories: 159,
fat: 6.0,
carbs: 24,
protein: 4.0,
iron: '1%',
},
{
name: 'Ice cream sandwich',
calories: 237,
fat: 9.0,
carbs: 37,
protein: 4.3,
iron: '1%',
},
{
name: 'Eclair',
calories: 262,
fat: 16.0,
carbs: 23,
protein: 6.0,
iron: '7%',
},
{
name: 'Cupcake',
calories: 305,
fat: 3.7,
carbs: 67,
protein: 4.3,
iron: '8%',
},
{
name: 'Gingerbread',
calories: 356,
fat: 16.0,
carbs: 49,
protein: 3.9,
iron: '16%',
},
{
name: 'Jelly bean',
calories: 375,
fat: 0.0,
carbs: 94,
protein: 0.0,
iron: '0%',
},
{
name: 'Lollipop',
calories: 392,
fat: 0.2,
carbs: 98,
protein: 0,
iron: '2%',
},
{
name: 'Honeycomb',
calories: 408,
fat: 3.2,
carbs: 87,
protein: 6.5,
iron: '45%',
},
{
name: 'Donut',
calories: 452,
fat: 25.0,
carbs: 51,
protein: 4.9,
iron: '22%',
},
{
name: 'KitKat',
calories: 518,
fat: 26.0,
carbs: 65,
protein: 7,
iron: '6%',
},
],
}),
})

Answer 2

The easiest thing would just be to use custom CSS on your component. In the <style> section add:
<style>
.v-data-table-header th {
text-transform: uppercase;
}
</style>
However, if you need to do more extensive customization on the headers, you can replace the entire header row like this:
<v-data-table
:headers="headers"
hide-default-header
>
<template #header="{ props: { headers } }">
<thead class="v-data-table-header">
<tr>
<th
v-for="header in headers"
:key="header.value"
class="text-uppercase"
scope="col"
>
{{ header.text }}
</th>
</tr>
</thead>
</template>
</v-data-table>
BUT, I would discourage this because you'll lose the built-in sorting functionality that Vuetify provides. That said, you CAN use this to add an additional header row that will appear before the default one. Just leave off the hide-default-header attribute on the v-data-table component and you will get two header rows, one with all of Vuetify's default functionality plus another custom one of your own design.

Answer 3

your code is correct but in this form you need to add each header alone like this:
<template>
<v-data-table
:headers="headers"
:items="desserts"
class="elevation-1"
>
<template v-slot:header.name="{ header }">
{{ header.text.toUpperCase() }}
</template>
<template v-slot:header.calories="{ header }">
{{ header.text.toUpperCase() }}
</template>
...
</v-data-table>
</template>
<script>
export default {
data: () => ({
headers: [
{
text: 'Dessert (100g serving)',
align: 'start',
value: 'name',
},
{ text: 'Calories', value: 'calories' },
{ text: 'Fat (g)', value: 'fat' },
{ text: 'Carbs (g)', value: 'carbs' },
{ text: 'Protein (g)', value: 'protein' },
{ text: 'Iron (%)', value: 'iron' },
],
desserts: [
{
name: 'Frozen Yogurt',
calories: 159,
fat: 6.0,
carbs: 24,
protein: 4.0,
iron: '1%',
},
....// rest of it
],
}),
}
</script>
this way you need to do this to every header alone the way of doing it is by adding v-slot:header.<value from headers array in the data>
example:
headers = [
{
text: "text1",
...
value: "category"
}
]
code will be:
<template v-slot:header.category="{ header }">
{{ header.text.toUpperCase() }}
</template>

Answer 4

First answer is correct, But I want to suggest a little improvement so you don't have to style it manually.
<template v-slot:header="{ props }">
<thead class="v-data-table-header">
<tr>
<th v-for="header in props.headers" :key="header.text">{{ header.text }} </th>
</tr>
</thead>
</template>