Conditions in loops in Vue

When looping through elements, you can impose conditions. But the v-for and v-if directives must be written on different tags, otherwise there will be a conflict. To avoid a conflict, the v-for directive is applied to the template tag, and the v-if directive is applied directly to the inserted tag.

Let's look at an example. Let's say we have the following array:

javascriptdata() {
  return {
    arr: [1, 2, 3, 4, 5],
  }
}

Let's iterate over this array using a loop:

html<template>
  <ul>
    <li v-for="elem in arr">
      {{ elem }}
    </li>
  </ul>
</template>

Now let's impose a condition on the elements to be shown:

html<template>
  <ul>
    <template v-for="elem in arr">
      <li v-if="elem % 2 === 0">
        {{ elem }}
      </li>
    </template>
  </ul>
</template>

javascriptdata() {
  return {
    items: [1, -2, 3, -4, 5],
  }
}