v-for function in Vue3: perfect solution to list data rendering

In Vue3, v-for is considered the best way to render list data. v-for is a directive in Vue that allows developers to iterate through an array or object and generate a piece of HTML code for each item. The v-for directive is one of the most powerful template directives available to developers. In Vue3, the v-for instruction has been further optimized, making it easier to use and more flexible.

The biggest change of the v-for directive in Vue3 is the binding of elements. In Vue2, using the v-for directive requires giving each element a key attribute so that Vue can track the status of each element. This can lead to unnecessary complexity in some cases. In Vue3, the v-for instruction uses a new key style, which can directly use the value as the key, thus avoiding unnecessary code and calculations.

The advantages of the v-for directive in Vue3 do not stop there. Vue3 also supports user-defined v-for functions so that developers can traverse arrays in their own way. The custom v-for function can iterate any type of data structure and can flexibly control the iteration process. This is a feature that is not supported in Vue2 and can help developers better solve problems in list data rendering.

To demonstrate how Vue3’s v-for function works, we will make a simple application that displays a series of movie posters. Let’s see how to implement this application using Vue3’s v-for function.

First, we need a JSON file to store the data of all movies. The following is a simple JSON file example:

[
  {
    "title": "假如爱有天意",
    "poster": "img/love-in-heaven.jpg",
    "rating": "7.5",
    "genre": ["剧情", "爱情"],
    "director": "付士琪",
    "actors": [{
        "name": "张一山",
        "role": "程皓"
      },
      {
        "name": "关晓彤",
        "role": "钟灵"
      },
      {
        "name": "张睿",
        "role": "方致远"
      }
    ]
  },
  {
    "title": "唐人街探案3",
    "poster": "img/tangren3.jpg",
    "rating": "7.6",
    "genre": ["喜剧", "悬疑"],
    "director": "陈思诚",
    "actors": [{
        "name": "王宝强",
        "role": "唐仁"
      },
      {
        "name": "刘昊然",
        "role": "秦风"
      },
      {
        "name": "妻夫木聪",
        "role": "石江山"
      }
    ]
  }
]

This file contains a set of movie data, including title, poster, rating, genre, director name, actor name and role. We will use this JSON file as our data source.

Next, we will create a Vue instance to render our list of movies. We can use the v-for directive in the Vue template to loop through each movie in the data source. We can include each movie's poster, name, and rating in an HTML element to display the movie's information.

<template>
  <div class="movie-list">
    <div v-for="movie in movies" :key="movie.title">
      <img src="/static/imghwm/default1.png"  data-src="movie.poster"  class="lazy"  : alt="movie poster" />
      <h2 id="movie-title">{{movie.title}}</h2>
      <div>评分：{{movie.rating}}</div>
    </div>
  </div>
</template>

<script>
import moviesData from "./movies.json";

export default {
  data() {
    return {
      movies: moviesData,
    };
  },
};
</script>

<style>
.movie-list {
  display: flex;
  flex-wrap: wrap;
}
.movie-list > div {
  width: 200px;
  margin: 10px;
  text-align: center;
}
.movie-list > div img {
  width: 150px;
  height: 200px;
  margin-bottom: 5px;
}
</style>

In this Vue template, we first import the movies.json file, which is our data source. We then store the list of movies from the movies.json file into the movies property of the Vue instance. Next, we use the v-for directive to loop through each movie and generate a piece of HTML code for each movie to display the movie's poster, name, and rating.

So far, we have created a simple Vue application for displaying a list of movies. We used the v-for directive in Vue3 to loop through an object and generate a piece of HTML code to display the poster, name and rating of each movie. We can also use a custom v-for function to better control the iteration process and solve problems in list data rendering.

In summary, the v-for function in Vue3 is a very powerful tool and performs very well in rendering list data. Using Vue3's v-for function, developers can more flexibly control the iteration process to meet different types of data structures. For scenarios of traversing data in Vue applications, we can use Vue3’s v-for function with complete confidence for optimal performance and optimal code simplicity.

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