javascript - How to trigger ESC button to clear text entered in text box?

Javascript - How to trigger ESC button to clear text entered in text box?

To programmatically trigger the ESC (Escape) key event to clear text entered in a text box using JavaScript, you can use the KeyboardEvent API along with event listeners. Here's how you can achieve this:

Example HTML and JavaScript

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Trigger ESC Key Event</title> </head> <body> <input type="text" id="myInput" value="Initial Text"> <script> document.addEventListener('DOMContentLoaded', function() { const inputElement = document.getElementById('myInput'); // Function to handle key press events function handleKeyPress(event) { // Check if ESC key is pressed if (event.key === 'Escape' || event.keyCode === 27) { // Clear the input value inputElement.value = ''; } } // Add event listener for key press events inputElement.addEventListener('keydown', handleKeyPress); }); </script> </body> </html>

Explanation

  1. HTML Structure: The HTML file contains an <input> element with an id="myInput" which represents the text box where text is entered.

  2. JavaScript Functionality:

    • The DOMContentLoaded event listener ensures that the JavaScript code executes after the HTML document is completely loaded.
    • The inputElement variable references the text box (<input> element) by its ID.
    • The handleKeyPress function is defined to handle key press events (keydown event).
    • Inside handleKeyPress, it checks if the event.key is 'Escape' or event.keyCode is 27 (which corresponds to the ESC key).
    • If the ESC key is pressed, it clears the input value by setting inputElement.value = ''.

  3. Event Listener: The keydown event listener is attached to the inputElement, which calls handleKeyPress whenever a key is pressed inside the text box.

Notes

  • Compatibility: Using event.key ('Escape') is more modern and preferable. Older browsers might not support event.key fully, so event.keyCode (27 for ESC) is included as a fallback.

  • Clearing Strategy: Clearing the input value (inputElement.value = '') is a simple example. Depending on your application, you might want to perform additional actions or validations.

  • Event Propagation: Ensure that the event propagation (event.preventDefault() or event.stopPropagation()) is handled properly if needed in more complex scenarios.

This example demonstrates how to handle the ESC key event to clear text entered in a text box using plain JavaScript. Adjust the code as per your specific requirements or integrate it into your existing application logic.

Examples

  1. JavaScript: Clear input field on pressing ESC key

    • Description: Implement a JavaScript function to clear the input field when the ESC key is pressed.
    • Code Implementation:
      document.addEventListener('keydown', function(event) { if (event.key === 'Escape') { document.getElementById('myInput').value = ''; } });

  2. jClear input field using ESC key

    • Description: Use jQuery to clear an input field when the ESC key is pressed.
    • Code Implementation:
      $(document).keydown(function(event) { if (event.key === 'Escape') { $('#myInput').val(''); } });

  3. React: Clear input field on ESC key press

    • Description: Clear an input field in React when the ESC key is pressed using state and event handling.
    • Code Implementation:
      import React, { useState } from 'react'; function InputComponent() { const [inputValue, setInputValue] = useState(''); function handleKeyDown(event) { if (event.key === 'Escape') { setInputValue(''); } } return ( <input type="text" value={inputValue} onChange={(e) => setInputValue(e.target.value)} onKeyDown={handleKeyDown} /> ); }

  4. Vue.js: Clear input field on ESC key

    • Description: Clear an input field in Vue.js when the ESC key is pressed using data binding and event handling.
    • Code Implementation:
      <template> <input type="text" v-model="inputValue" @keydown="clearOnEscape"> </template> <script> export default { data() { return { inputValue: '' }; }, methods: { clearOnEscape(event) { if (event.key === 'Escape') { this.inputValue = ''; } } } }; </script>

  5. Angular: Clear input field on ESC key press

    • Description: Clear an input field in Angular when the ESC key is pressed using template-driven forms and event binding.
    • Code Implementation:
      <input type="text" [(ngModel)]="inputValue" (keydown.escape)="inputValue = ''">

  6. Vanilla JavaScript: Clear textarea content on ESC key

    • Description: Clear the content of a textarea when the ESC key is pressed using pure JavaScript.
    • Code Implementation:
      document.addEventListener('keydown', function(event) { if (event.key === 'Escape') { document.getElementById('myTextarea').value = ''; } });

  7. React Native: Clear TextInput on ESC key

    • Description: Clear a TextInput field in React Native when the ESC key is pressed using state and event handling.
    • Code Implementation:
      import React, { useState } from 'react'; import { TextInput } from 'react-native'; function InputComponent() { const [inputValue, setInputValue] = useState(''); function handleKeyDown(event) { if (event.key === 'Escape') { setInputValue(''); } } return ( <TextInput value={inputValue} onChangeText={setInputValue} onKeyPress={handleKeyDown} /> ); }

  8. AngularJS: Clear input field on ESC key press

    • Description: Clear an input field in AngularJS when the ESC key is pressed using ng-model and ng-keydown directives.
    • Code Implementation:
      <input type="text" ng-model="inputValue" ng-keydown="$event.keyCode === 27 ? inputValue = '' : null">

  9. jQuery UI: Clear input field on ESC key

    • Description: Use jQuery UI to clear an input field when the ESC key is pressed.
    • Code Implementation:
      $('#myInput').on('keydown', function(event) { if (event.key === 'Escape') { $(this).val(''); } });

  10. Ember.js: Clear input field on ESC key press

    • Description: Clear an input field in Ember.js when the ESC key is pressed using Ember components and actions.
    • Code Implementation:
      <input type="text" value={{inputValue}} {{action "clearInputOnEscape" on="keyPress"}}> // app/components/my-input-component.js import Component from '@ember/component'; export default Component.extend({ inputValue: '', actions: { clearInputOnEscape(event) { if (event.key === 'Escape') { this.set('inputValue', ''); } } } });

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