Vue.js Key Modifiers: Enhancing Event Handling

Vue.js provides powerful built-in directives for event handling. This challenge focuses on leveraging and understanding the key modifiers (.enter, .tab, .delete, .esc, .space, .up, .down, .left, .right) to create more refined and user-friendly interactive components. Mastering these modifiers is crucial for building robust and responsive user interfaces.

Problem Description

Your task is to create a Vue.js component that demonstrates the functionality of Vue's native key modifiers. You will build a simple form input where specific key presses trigger distinct actions, rather than the default form submission or input behavior.

What needs to be achieved:

1. Create a Vue component that includes an input field.
2. Implement event listeners for keyup events on this input field.
3. Utilize at least three different Vue.js key modifiers to handle specific key presses.

Key requirements:

• The component should have an input field where the user can type.
• When the Enter key is pressed, a specific action should occur (e.g., logging a message to the console, updating a state variable).
• When the Escape key is pressed, another distinct action should occur (e.g., clearing the input field, showing an alert).
• When the Tab key is pressed, a third action should be triggered (e.g., focusing on another element, displaying a tooltip).
• The component should be written in TypeScript.

Expected behavior:

• Typing in the input field should behave normally until a modifier key is pressed.
• Pressing Enter should trigger the Enter key action without submitting a form (if it were in one).
• Pressing Escape should trigger the Escape key action.
• Pressing Tab should trigger the Tab key action.
• Other key presses should not trigger these specific actions.

Edge cases to consider:

• What happens if the user holds down a modifier key? (Vue's modifiers generally handle this gracefully, but it's good to be aware).
• How does this behave in different browsers? (Vue's modifiers aim for cross-browser compatibility).

Examples

Example 1: Basic Enter and Escape Usage

<template>
  <div>
    <input
      type="text"
      placeholder="Type here and press Enter or Esc"
      @keyup.enter="handleEnter"
      @keyup.esc="handleEscape"
      v-model="inputValue"
    />
    <p>Current Value: {{ inputValue }}</p>
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup() {
    const inputValue = ref('');

    const handleEnter = () => {
      console.log('Enter key pressed. Value:', inputValue.value);
      // Optionally clear input or perform other action
      // inputValue.value = '';
    };

    const handleEscape = () => {
      console.log('Escape key pressed. Clearing input.');
      inputValue.value = '';
    };

    return {
      inputValue,
      handleEnter,
      handleEscape,
    };
  },
});
</script>

Input: User types "Hello" and then presses Enter. Output (Console): Enter key pressed. Value: Hello Output (DOM): The text "Current Value: Hello" is displayed.

Input: User types "World" and then presses Escape. Output (Console): Escape key pressed. Clearing input. Output (DOM): The input field and the displayed value become empty.

Example 2: Incorporating the Tab Modifier

<template>
  <div>
    <input
      id="field1"
      type="text"
      placeholder="Input 1"
      @keyup.tab="handleTab"
      v-model="field1Value"
    />
    <input
      id="field2"
      type="text"
      placeholder="Input 2"
      v-model="field2Value"
    />
  </div>
</template>

<script lang="ts">
import { defineComponent, ref } from 'vue';

export default defineComponent({
  setup() {
    const field1Value = ref('');
    const field2Value = ref('');

    const handleTab = () => {
      console.log('Tab key pressed in Input 1. Attempting to focus Input 2.');
      const field2 = document.getElementById('field2');
      if (field2) {
        field2.focus();
      }
    };

    return {
      field1Value,
      field2Value,
      handleTab,
    };
  },
});
</script>

Input: User types in the "Input 1" field and presses Tab. Output (Console): Tab key pressed in Input 1. Attempting to focus Input 2. Output (DOM): The focus shifts from "Input 1" to "Input 2" (if the natural tab order would have gone elsewhere or to provide a custom behavior).

Constraints

• Your solution must use Vue 3 with the Composition API.
• All logic related to event handling must be implemented within the <script lang="ts"> block.
• You must demonstrate the usage of at least three different key modifiers from the list provided (.enter, .tab, .delete, .esc, .space, .up, .down, .left, .right).
• The component should be self-contained and runnable within a basic Vue application setup.

Notes

• Consider how you might combine key modifiers (e.g., @keyup.ctrl.enter). While not strictly required for this challenge, it's a related concept to explore.
• Think about the accessibility implications of overriding default browser behaviors, especially with Tab. Ensure your custom behavior doesn't hinder navigation for users who rely on keyboard navigation.
• The goal is to showcase understanding of how to use these modifiers, not necessarily to build a complex application. Simple console logs or state updates are sufficient for demonstrating the behavior.