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<!DOCTYPE html> <html> <head> <link href="https://fonts.googleapis.com/css?family=Roboto:100,300,400,500,700,900" rel="stylesheet"> <link href="https://cdn.jsdelivr.net/npm/@mdi/font@6.x/css/materialdesignicons.min.css" rel="stylesheet"> <link href="https://cdn.jsdelivr.net/npm/vuetify@2.x/dist/vuetify.min.css" rel="stylesheet"> <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no, minimal-ui"> </head> <body> <div id="app"> <v-app> <v-main> <v-container> <h3>Creating Vuetify Validation Rules: Accept Empty Strings and Specific Number of Characters</h3> <v-text-field v-model="inputValue" clearable label="Input Field" :rules="inputValidationRules"></v-text-field> </v-container> </v-main> </v-app> </div> <script src="https://cdn.jsdelivr.net/npm/vue@2.x"></script> <script src="https://cdn.jsdelivr.net/npm/vuetify@2.x"></script> <script> new Vue({ el: '#app', vuetify: new Vuetify(), data() { return { inputValue: '', }; }, computed: { inputValidationRules() { return [ (value) => (value === '' || value.length === 5) || 'Input must be empty or have exactly 5 characters', ]; }, }, }); </script> </body> </html>