Vue Js Input allow only small letter:In Vue.js, to allow only small letters in an input field, use the “pattern” attribute with a regex pattern. Add a method to validate the input, which checks if the value matches the pattern. The regex pattern “/^[a-z]+$/” ensures that the input contains only lowercase letters. Bind the input’s pattern attribute to the regex pattern and display an error message if the input doesn’t match the pattern. This approach restricts the input to small letters only and provides user feedback if they try to input uppercase letters or other characters.

How can I restrict input in a Vue.js text field to only accept lowercase letters?

The given code is a Vue.js implementation that restricts input in an HTML text input field to only accept lowercase letters.

The code uses the v-model directive to bind the inputValue data property to the value of the input field. The @keydown event listener is used to trigger the restrictInput method whenever a key is pressed.

Inside the restrictInput method, a regular expression /^[a-z]*$/ is used to check if the input consists only of lowercase letters. If the input is valid, isInputValid is set to true. Otherwise, isInputValid is set to false.

Additionally, the inputValue is modified using the replace method to remove any characters that are not lowercase letters.

If the input is invalid, an error message is displayed below the input field using conditional rendering with the v-if directive and the isInputValid flag.

Overall, this code ensures that the input field only allows lowercase letters and provides visual feedback to the user when an invalid input is entered.

Vue Js Input allow only small letter Example

 <div id="app">
    <input type="text" v-model="inputValue" @keydown="restrictInput" />
    <div v-if="!isInputValid" class="error-message">Only small letters are allowed.</div>
  </div>
  <script>
    const app = Vue.createApp({
      data() {
        return {
          inputValue: '',
          isInputValid: true
        };
      },
      methods: {
        restrictInput() {
          this.isInputValid = /^[a-z]*$/.test(this.inputValue);
          this.inputValue = this.inputValue.replace(/[^a-z]/g, '');
        }
      }
    });
    app.mount('#app');
  </script>

Output of Vue Js Input allow only small letter

How to automatically lowercase input in Vue.js

In Vue.js, you can create a method that is triggered whenever the input field’s value changes. Within this method, you can use the toLowerCase() method to convert the input value to all lowercase letters. You can then set the input field’s value to the lowercase version of the input. This will ensure that only small letters are allowed in the input field.

Vue Js Textbox allow only small letter – Method 2

 <div id="app">
    <h3>Vue Js Textbox allow only small letter</h3>
    <input type="text" v-model="inputValue" @input="handleInput" />

  </div>
  <script>
    const app = Vue.createApp({
       data() {
        return {
          inputValue: ''
        };
      },
      methods: {
        handleInput() {
          this.inputValue = this.inputValue.toLowerCase();
        }
      }
    });
    app.mount('#app');
  </script>