<template> <DocSectionText v-bind="$attrs"> <p>Invalid state style is added using the <i>p-invalid</i> class to indicate a failed validation.</p> </DocSectionText> <div class="card flex flex-column align-items-center gap-3"> <TriStateCheckbox v-model="value" class="p-invalid" /> <label for="checkbox">{{ value == null ? 'null' : value }}</label> </div> <DocSectionCode :code="code" /> </template> <script> export default { data() { return { value: null, code: { basic: ` <TriStateCheckbox v-model="value" class="p-invalid" /> `, options: ` <template> <div class="card flex flex-column align-items-center gap-3"> <TriStateCheckbox v-model="value" class="p-invalid" /> <label for="checkbox">{{ value == null ? 'null' : value }}</label> </div> </template> <script> export default { data() { return { value: null } } } <\/script> `, composition: ` <template> <div class="card flex flex-column align-items-center gap-3"> <TriStateCheckbox v-model="value" class="p-invalid" /> <label for="checkbox">{{ value == null ? 'null' : value }}</label> </div> </template> <script setup> import { ref } from 'vue'; const value = ref(null); <\/script> ` } }; } }; </script>