vue.js -如何将对象数组拆分为多个div列

Question

这是我的vue布局：

<template lang="pug">
  .row
    .col-4(v-for="article in articles") // need to render 1-3 items here
      | {{ article.name }}
  .row
    .col-4(v-for="article in articles") // need to render 4-6 items here
      | {{ article.name }}
</template>

<script>
export default {
  name: 'Articles',
  data() {
    return {
      articles: [
        { name: 'Article 1' },
        { name: 'Article 2' },
        { name: 'Article 3' },
        { name: 'Article 4' },
        { name: 'Article 5' },
        { name: 'Article 6' },
      ]
    }
  },
}
</script>

目标是：

<div class="row">
  <div class="col-4">article[0].name</div>
  <div class="col-4">article[1].name</div>
  <div class="col-4">article[2].name</div>
</div>

<div class="row">
  <div class="col-4">article[3].name</div>
  <div class="col-4">article[4].name</div>
  <div class="col-4">article[5].name</div>
</div>

在基于Python的(如Flask和Jinja )中，可以这样做：

{% for article_row in articles | batch(3, ' ') %}
  <div class="row">
    {% for article in article_row %}
    <div class="span4">{{ article }}</div>
    {% endfor %}
  </div>
{% endfor %}

那么，在vue.js中有这样的方法吗？

Answer 1

我将使用helper数组在行中呈现项目组：

<template lang="pug">
  .container
    .row(v-for="(group, i) in articleGroups")
      .col-4(v-for="article in articles.slice(i * itemsPerRow, (i + 1) * itemsPerRow)")
        | {{ article.name }}
</template>

<script>
export default {
  name: 'Articles',
  data() {
    return {
      itemsPerRow: 3,
      articles: [
        { name: 'Article 1' },
        { name: 'Article 2' },
        { name: 'Article 3' },
        { name: 'Article 4' },
        { name: 'Article 5' },
        { name: 'Article 6' },
      ]
    }
  },
  computed: {
    articleGroups () {
      return Array.from(Array(Math.ceil(this.articles.length / this.itemsPerRow)).keys())
    }
  },
}
</script>

演示： https://codesandbox.io/s/rj60o8l5p

Answer 2

我会用一个计算的属性把它们分块。如果您有可用的lodash，您可以：

computed: {
  chunked () {
    return _.chunk(this.articles, 3)
  },
},

如果你周围没有房客的话，你可以找到到处乱跑的逻辑。

function chunk (arr, len) {

  const chunks = []
  const i = 0
  const n = arr.length

  while (i < n) {
    chunks.push(arr.slice(i, i += len))
  }

  return chunks
}

然后，你可以：

<div class="row" v-for="chunk in chunked">
  <div class="col-4" v-for="article in chunk">
    {{ article.name }}
  </div>
</div>

Answer 3

v-for="(article,i) in articles"与v-if="i>=0 && i<3"的结合