How to use placeholder in select box if it is created with v-for?

Update:

Due to my own fault of not mentioning, that tool is created in a v-for loop during render, I couldn’t apply the proposed answers although they might have been correct.

In the end I did a workaround by adding following css sudo element to the parent of the select element:

&::after {
  position: absolute;
  content: 'Paragraph';
  margin-right: .83rem;
  font-size: .83rem;
  place-self: center;
}

and setting it to display: none, when an item is selected.

Original Question:

I’m creating a select element in vue 3 with help of v-for:

<template>
    <select v-model="tool.action" @change="selectType(tool.action)">
        <option v-for="option in options" :key="option" :value="option.value">{{ option.text }}</option>
    </select>
</template>

<script setup>
const options: [
    { text: 'Heading 1', value: 'h1' },
    { text: 'Heading 2', value: 'h2' },
    { text: 'Heading 3', value: 'h3' },
    { text: 'Paragraph', value: 'p' },
]
</script>

Now I want to set a placeholder text in the select box to Paragraph. Usually it would work like this:

<select>
    <option value="p" selected>Paragraph</option>
</select>

but v-for removes the option of setting selected manually so how do I do it?

Answer

A <select>‘s placeholder is usually disabled and not one of the available options. You can do that with an <option> before your v-for of selectable <option>s:

<template>
    <select v-model="tool.action" @change="selectType(tool.action)">
        <option disabled value="">Placeholder Option</option> 👈
        <option v-for="option in options" :key="option" :value="option.value">{{ option.text }}</option>
    </select>
</template>

demo 1

If you actually want to set the <select>‘s initial value, you could set the <select>‘s model (i.e., tool.action) to the desired value:

<script setup>
⋮
tool.action = 'p' // initialize to 'Paragraph' option's value
</script>

demo 2