Determine whether an element is currently focused using a Vue.js directive

Question

Determine whether an element is currently focused using a Vue.js directive

I'm attempting to verify if an element is currently in focus, specifically an input field, and then apply a class to another element. This is the code I have been working on, but for some reason the hasFocus() function isn't functioning as expected.

onFocus () {
    let isFocused = document.el.querySelector('a-input');
    let focusedEl = document.el.querySelector('a-button');

    if(isFocused.hasFocus()) {
      focusedEl.classList.add('testClass');
    }
  }

I'm trying to implement this functionality within a custom directive in Vue.js.

javascript vue.js vue-directives

Answer 1

Answer №1

Check out a helpful tip from the Vue.js community in this topic on the forum. They suggest using the focusin event:

During the 'created' lifecycle hook:
  document.addEventListener('focusin', this.focusChanged)
After 'beforeDestroy':
  document.removeEventListener('focusin', this.focusChanged)
Methods include:
  focusChanged (event) {
    const el = event.target
    // Handle element focus change here.
  }
}

Answer 2

Check out a helpful tip from the Vue.js community in this topic on the forum. They suggest using the focusin event:

During the 'created' lifecycle hook:
  document.addEventListener('focusin', this.focusChanged)
After 'beforeDestroy':
  document.removeEventListener('focusin', this.focusChanged)
Methods include:
  focusChanged (event) {
    const el = event.target
    // Handle element focus change here.
  }
}

Answer 3

Answer №2

After considering the necessity of creating a custom directive:

This is my solution.

class customizedDirective {
  constructor (element, settings = {}) {
    this.element = element
    this.inputField = element.querySelector('.custom-input')
    this.actionButton = element.querySelector('.custom-button')

    this.onInputFieldFocus = this.onInputFieldFocus.bind(this)

    this.bindEvents()
  }

  onInputFieldFocus () {
    this.actionButton.classList.add('special-class')
  }

  bindEvents () {
    this.inputField.addEventListener('focus', this.onInputFieldFocus)
  }
}

Answer 4

After considering the necessity of creating a custom directive:

This is my solution.

class customizedDirective {
  constructor (element, settings = {}) {
    this.element = element
    this.inputField = element.querySelector('.custom-input')
    this.actionButton = element.querySelector('.custom-button')

    this.onInputFieldFocus = this.onInputFieldFocus.bind(this)

    this.bindEvents()
  }

  onInputFieldFocus () {
    this.actionButton.classList.add('special-class')
  }

  bindEvents () {
    this.inputField.addEventListener('focus', this.onInputFieldFocus)
  }
}

Determine whether an element is currently focused using a Vue.js directive

Answer №1

Answer №2

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