Vue 'updated' Lifecycle Hook

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Example

Using the updated lifecycle hook to write a message to the console every time the DOM tree is updated.

export default {
  data() {
    return {
      sliderVal: 50,
      renderCount: 0
    }
  },
  updated() {
    this.renderCount++;
    console.log('Updated ' + this.renderCount + ' times.')
  }
}

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Definition and Usage

The updated lifecycle hook happens right after the DOM tree has updated.

If we modify a property or do something else in the updated hook that triggers a new render, the updated hook will be called again after that new render, and we have most likely created an infinite loop.

To avoid an infinite loop we should always consider to use the beforeUpdate lifecycle hook instead of the updated lifecycle hook.

The this.$nextTick() or nextTick() functions can also be used to run code after the DOM has been updated.

Note: In the example above, we write the render count to the console, because making changes to the view would re-activate the updated hook and create an infinite loop.

Vue Tutorial: Vue Lifecycle Hooks

Vue Tutorial: The 'beforeUpdate' Hook

Vue Reference: Vue 'beforeUpdate' Lifecycle Hook

Vue Reference: Vue $nextTick() Method

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