javascript - framework - ¿Cómo se muestran las filas especificadas usando vue js?

framework vue js

Question

Estos son los datos que obtuve de la url. Necesito imprimir solo la segunda y la cuarta fila,

{
    "status": "ok",
    "source": "n",
    "sortBy": "top",
    "articles": [
        {
            "author": "Bradford ",
            "title": "friends.",
            "url": "http: //",
            "urlToImage": "http://"
        },
        {
            "author": "Bradford  ",
            "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
            "url": "http: //",
            "urlToImage": "http://"
        },
              "author": "Bord  ",
            "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
            "url": "http: //",
            "urlToImage": "http://"
        },
             "author": "Brad  ",
            "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
            "url": "http: //",
            "urlToImage": "http://"
        }
    ]
}

My vue js script se da a continuación. Así es como recupero el valor de la URL correspondiente

 <script>
    new Vue({
        el: ''#feed'' ,
        data: {
        articles: [],
        },
        mounted() {
        this.$nextTick(function() {
          var self = this;
          $.ajax({
                url: "https://newsapi.org/v1/articles?source=espn&sortBy=top&apiKey=4db9d5d381a14ffcbca8e8a9aa8b864c",
                method: "GET",
                dataType: "JSON",
                success: function (e) {
                    if (e.status == ''ok'') {
                        self.articles = e.articles;
                        console.log(e.articles)
                    }
                }, error: function(){
                console.log(''Error occurred'');
                }
            });
        })
        },
       })
</script>

MI HTML ES

<div id="feed">
<div v-for="post in articles" class="mke_">
  <div class="row">
      {{post.title}}
    </div>
</div>
</div>

Ayúdame a mostrar solo los artículos 2º y 4º []? Soy débil en js. Por lo tanto, será genial para ayudarme

Answer 1

Por segunda y cuarta fila, supongo que quiere decir que los elementos en el índice 1 y 3. La forma más sencilla de hacerlo sería agregar un v-if vincula con la siguiente condición: articles.indexOf(post) == 1 || articles.indexOf(post) == 3 articles.indexOf(post) == 1 || articles.indexOf(post) == 3 .

new Vue({
  el: ''#feed'',
  data: {
    articles: [{
        "author": "Bradford ",
        "title": "friends.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Bradford  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }, {
        "author": "Bord  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Brad  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }
    ]
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>

<div id="feed">
  <div v-for="post in articles" v-if="articles.indexOf(post) == 1 || articles.indexOf(post) == 3" class="mke_">
    <div class="row">
      {{post.title}}
      <br/>
      <small>{{post.author}}</small>
    </div>
  </div>
</div>

Para separar la UI de la lógica, puede usar una calculada para ese propósito. El calculado puede filtrar los valores requeridos como:

return this.articles.filter(t => 
    this.articles.indexOf(t) == 1 
    || this.articles.indexOf(t) == 3
);

new Vue({
  el: ''#feed'',
  data: {
    articles: [{
        "author": "Bradford ",
        "title": "friends.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Bradford  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }, {
        "author": "Bord  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Brad  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }
    ]
  },
  computed: {
    filteredPosts() {
      return this.articles.filter(t => this.articles.indexOf(t) == 1 || this.articles.indexOf(t) == 3);
    }
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>

<div id="feed">
  <div v-for="post in filteredPosts" class="mke_">
    <div class="row">
      {{post.title}}
      <br/>
      <small>{{post.author}}</small>
    </div>
  </div>
</div>

Nota: He agregado en el autor de la publicación a la pantalla para que sea más fácil conocer el índice de elementos filtrados.

Actualizar

Según lo sugerido por Bert , el filtro puede mejorarse para:

return this.articles.filter((t, i) => 
    i == 1 || i == 3
);

new Vue({
  el: ''#feed'',
  data: {
    articles: [{
        "author": "Bradford ",
        "title": "friends.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Bradford  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }, {
        "author": "Bord  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      },
      {
        "author": "Brad  ",
        "title": "Kershaw threw six mesmerizing innings to put L.A. into the Fall Classic.",
        "url": "http: //",
        "urlToImage": "http://"
      }
    ]
  },
  computed: {
    filteredPosts() {
      return this.articles.filter((t,i) => i == 1 || i == 3);
    }
  }
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.2/vue.min.js"></script>

<div id="feed">
  <div v-for="post in filteredPosts" class="mke_">
    <div class="row">
      {{post.title}}
      <br/>
      <small>{{post.author}}</small>
    </div>
  </div>
</div>