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Vuetify Validation Rule: Allow Empty String or Specific Number of Characters

Vuetify is a popular framework for building responsive and elegant web applications using Vue.js. One common requirement in web development is to validate user inputs. In this post, we will discuss how to create Vuetify validation rules that allow either empty strings or enforce a specific number of characters in an input field.

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How to Validate Empty Strings and Specified Numbers of Characters in Vuetify?

To illustrate how to validate empty strings and enforce a specific character count using Vuetify, we will create a simple input field with corresponding validation rules.

Validate Empty Strings and Specified Number of Characters with Vuetify Validation Rules

<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>

Run

In the code above, we have a Vuetify v-text-field component that binds to the inputValue property using v-model. We also specify an array of validation rules using the :rules attribute.

Vuetify Creating Validation Rules

In the JavaScript section of our code, we define the validation rules inside the computed property. These rules are defined as an array of functions that take the input value as their argument. The primary rule checks if the value is either an empty string or has exactly 5 characters. If the input doesn't meet these conditions, it returns an error message.

<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>

In this example, the validation rule is a function that checks whether the input value is an empty string or has exactly 5 characters. If the condition is not met, it returns an error message, specifying the required condition

Output of Vuetify Validation Rule: Accept Empty String or Specific Character Count

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