Using Vue: Triggering .focus() on a button click

My journey with vue.js programming started just yesterday, and I'm facing a challenge in setting the focus on a textbox without using the conventional JavaScript method of 

document.getElementById('myTextBox').focus()
.

The scenario is that initially, the textbox is hidden. Upon clicking a "Start" button, the textbox gets displayed, and I want to focus on it at that point. I attempted using ref, but couldn't get it to work (refer to code snippet below).

HTML:

<input id="typeBox" ref="typeBox" placeholder="Type here..." />

Javascript

export default {
  name: 'game',

  methods: {
    startTimer () {
      setTimeout(function () { /* .focus() won't work without this */

        /* ugly and not recommended */
        // document.getElementById('typeBox').focus()

        /* Throws the error: Cannot read property 'typeBox' of undefined */
        this.$refs.typeBox.focus()

        // ... any other options?
          // ...

      }, 1)
    }
  } /* END methods */

} /* END export default */

Is there anyone who can assist me with achieving this? Your guidance will be highly appreciated.

UPDATE:

Including autofocus attribute on the input element helps in focusing immediately after the page loads. However, in my application, I need to re-focus on the input field multiple times without page reload, which is why I need a way to trigger .focus() programmatically.

javascriptvue.jsvuejs2setfocus

Answer №1

Here is the solution that I wanted to share in case someone else faces a similar issue...

After getting assistance from a senior programmer, I was able to solve the problem without using setTimeout, by utilizing its alternative in the vue version called nextTick().

Below is the corrected JS code:

startTimer () {
    this.$nextTick(() => {

        // The initial code doesn't work as expected because `this.$refs.typeBox` returns an array
        // this.$refs.typeBox.focus()

        // This revised code works perfectly fine
        this.$refs.typeBox[0].focus()

    })
} /* END startTimer */

Explanation:

Upon logging console.log(this.$refs.typeBox), I received an array as output:

This necessitated using typeBox[0].focus() instead of typeBox.focus() for the code to function correctly.

Answer №2

When the setTimeout function is executed after a period of time, the value of this is set to the window object because it has lost its original scope. This happens because the callback function's context is different from where the function was called.

Arrow functions do not have their own value of this.

startTimer () {
  setTimeout(() => {
    this.$refs.typeBox.focus()
  }, 1)
}

OR

startTimer () {
  const self = this;
  setTimeout(function () {
    self.$refs.typeBox.focus()
  }, 1)
}

Answer №3

After much trial and error, I was able to resolve the issue without using setTimeout. Surprisingly, utilizing window.requestAnimationFrame did the trick:

beginCountdown () {
    window.requestAnimationFrame(() => this.$refs.inputField.focus())
}

This method even proved successful for focusing on custom components.

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