What is the most effective method in Vue.js for transitioning elements without the need to use v-for and v-if at the

Utilizing v-for to generate multiple <p> elements, each one animating in within a Vue <transition> component if the v-if condition is met. Below is the code snippet:

<transition name="fade">
  <p
    v-for="(quote, idx) in game.quotes" <-- game.quotes is sourced from VUEX
    :key="`game-quote-${idx}`"
    class="quote-box__current_quote"
    v-if="game.currentQuoteIdx === idx"
  >"{{ quote.content }}"</p>
</transition>

Encountering ESLINT errors due to the vue/no-use-v-if-with-v-for rule.

Research led me to the Vue style guide: https://v2.vuejs.org/v2/style-guide/#Avoid-v-if-with-v-for-essential, suggesting to avoid combining v-for and v-if on the same element. I aim to achieve individual animations using the <transition> wrapper (displaying only one <p> at a time). Is there a better approach that doesn't involve pairing v-if with v-for?

Additionally, facing an issue related to game.quotes in

v-for="(quote, idx) in game.quotes"
:

The 'undefined' variable inside 'v-for' directive should be replaced with a computed property that returns filtered array instead. You should not mix 'v-for' with 'v-if'.

game.quotes originates from Vuex and doesn't require filtering. Why does ESLINT suggest creating a computed property to return a filtered array?

VIEW ON GITHUB - Line 10

Answer №1

It is recommended in the official documentation that any conditional rendering within loops be handled using computed functions. It is advised to perform your conditional filtering within the computed function (if you're utilizing Vuex) and then display the result in the template.

For more information on this best practice, refer to the official style guide: https://v2.vuejs.org/v2/style-guide/#Avoid-v-if-with-v-for-essential

Answer №2

Utilize a computed property to filter an array efficiently. When using v-if alongside v-for in your code, you are essentially filtering the array to display only specific items during iteration. Consider implementing computed properties for a safer and more manageable approach.

Answer №3

Consider this scenario, which closely resembles your own: Avoid displaying unnecessary li elements. While combining v-for and v-if is functional, it may not be the most conventional approach. However, there exists a simpler solution.

<h2>Items:</h2>
<ol id="list">
  <li v-for="item in items" v-if="visible.includes(item)" :id="'item-'+item">
    {{ item }}
  </li>
</ol>

https://jsfiddle.net/oLjuy5bv/1/

Instead of that approach, as mentioned in the other answers, you could create a computed method to generate the list for the v-for without needing the v-if.

<h2>Items:</h2>
<ol id="list">
  <li v-for="item in visible_items" :id="'item-'+item">
    {{ item }}
  </li>
</ol>

computed: {
  visible_items () {
    return this.items.filter(item => this.visible.includes(item))
  }
},

https://jsfiddle.net/17Ln5mw8/

If your objective involves dealing with the idx and possibly game context using a method like this:

<transition name="fade">
  <p
    v-for="(quote, idx) in gameQuotesByIdx(idx)"
    :key="`game-quote-${idx}`"
    class="quote-box__current_quote"
  >"{{ quote.content }}"</p>
</transition>

methods: {
  gameQuotesByIdx(idx) {
    return ...
  }
},

You might encounter reactivity issues where the component fails to respond to changes in array state (which the computed method resolves). In such cases, consider refactoring the code accordingly.

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