Vue Js Textbox allow only capital letter:To allow only capital letters in a Vue.js textbox using regex, you can use the @input event to capture the input and update the textbox value based on a regular expression match. Inside the onInput method, you can use the RegExp.test() method with the regular expression /^[A-Z]*$/ to check if the input consists of only capital letters. If it doesn’t match, you can set the textbox value to an empty string. This ensures that only capital letters are allowed in the textbox.

How can I create a Vue.js textbox that only accepts capital letters?

The provided code snippet demonstrates how to create a textbox in Vue.js that allows only capital letters.

The code sets up a Vue application with an input element bound to the inputValue data property using v-model. The handleInput method is triggered whenever the input value changes.

Inside the handleInput method, a regular expression is used to check if the input consists of only capital letters. If it does not match the pattern, the isInputValid property is set to false, and an error message is displayed.

Additionally, the method removes any non-capital letters from the input by replacing them with an empty string using the replace function and a regular expression

Vue Js Textbox allow only capital letter Example

<div id="app">
    <input type="text" v-model="inputValue" @input="handleInput" />
    <div v-if="!isInputValid" class="error-message">Only capital letters are allowed.</div>
  </div>
  <script>
    const app = Vue.createApp({
      data() {
        return {
          inputValue: "",
          isInputValid: true
        };
      },
      methods: {
        handleInput() {
          // Check if the input consists of only capital letters
          this.isInputValid = /^[A-Z]*$/.test(this.inputValue);
          // Remove any non-capital letters from the input
          this.inputValue = this.inputValue.replace(/[^A-Z]/g, "");
        }
      }
    });
    app.mount('#app');
  </script>

Output of Vue Js Textbox allow only capital letter