How can I disable literal values in Vuetify? - vuejs2

Question

I am having problems when using the "item-disabled" prop on the v-select component from vuetify. I am trying to use this with literal options.
Here is the snippet which reproduces the issue:
In this example I would like to disable the option "Buzz".
Vue.use(Vuetify)
new Vue({
el: '#app',
data: () => ({
items: ['Foo', 'Bar', 'Fizz', 'Buzz'],
disabledItems: ['Buzz'],
})
})
<link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900|Material+Icons" rel="stylesheet">
<link href="https://cdnjs.cloudflare.com/ajax/libs/vuetify/1.5.14/vuetify.min.css" rel="stylesheet" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.10/vue.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/vuetify/1.5.14/vuetify.min.js"></script>
<div id="app">
<v-app id="inspire">
<v-container fluid grid-list-xl>
<v-layout wrap align-center>
<v-flex xs12 sm6 d-flex>
<v-select :items="items" :item-disabled="disabledItems" box label="Box style"></v-select>
</v-flex>
</v-layout>
</v-container>
</v-app>
</div>
<v-select :items="items" :item-disabled="disabledItems"></v-select>
...
items: ['Foo', 'Bar', 'Fizz', 'Buzz'],
disabledItems: ['Buzz'],
I do realize that I could use the non-literal key-value pair like in this example: https://codepen.io/anon/pen/joyoaj and it would work. But I would prefer to not have to write a wrapper component to convert literal options to key-value just to work around this.
<v-select :items="items"></v-select>
...
items: [
{text: 'Foo', value: 'Foo'},
{text: 'Bar', value: 'Bar'},
{text: 'Fizz', value: 'Fizz'},
{text: 'Buzz', value: 'Buzz', disabled: true},
],
Does anyone know how to get disabling literal values working?

Answer 1

You cant do it like that because item-disabled property is actually for something else.
From docs:
item-disabled
Default: disabled
Type: string | array | function
Set property of items's disabled value
So item-disabled just specifies which field on the objects will be treated as "disabled-field". By default, that field is disabled.
Without item-disabled you would have objects like this:
items: [
{text: 'Foo', value: 'Foo'},
{text: 'Buzz', value: 'Buzz', disabled: true},
],
And if objects have some other "disabled-property" (e.g. customDisabled) then use item-disabled prop like this:
<v-select :items="items" item-disabled="customDisabled"
// ...
items: [
{text: 'Foo', value: 'Foo'},
{text: 'Buzz', value: 'Buzz', customDisabled: true},
],
Codepen
If you need to preserve your arrays of strings then you could just map items to the array of objects and pass it:
<v-select :items="computedItems"
// ...
data: () => ({
items: ['Foo', 'Bar', 'Fizz', 'Buzz'],
disabledItems: ['Buzz'],
}),
computed: {
computedItems() {
return this.items.map(item => {
return {
text: item,
disabled: this.disabledItems.includes(item)
}
})
}
}
Codepen
Additionally, you can pass array to reach desired depth if your disabled field is nested, for example:
:item-disabled="['meta', 'disabled']"
// ...
{
text: item,
meta: {
disabled: true
}
}

Answer 2

Real working minimal example with function checking per item.
<v-select
:items="items"
item-text="name"
item-value="id"
:item-disabled="checkIsItemDisabled"
/>
<script>
data: function(){
return {
items: [
{id: 1, name: 'Foo'},
{id: 2, name: 'Bar'},
],
},
methods: {
checkIsItemDisabled(item) {
return (item.id === 1)
},
}
},
</script>

Answer 3

Adding the function option to #Traxo's answer:
<v-select :items="items" item-disabled="disableItem">
...
methods: {
disableItem(item) {
if (item.prop === this.anyOtherPropValue) {
return true;
}
return false;
},
},
Yes is reactive in case this.anyOtherPropValue change