How to implement table sorting and column hiding functions in Vue documents

Vue is a popular JavaScript framework that is widely used for developing front-end projects. Among them, Vue's documentation provides many useful functions and code examples, including table sorting and column hiding. If you are developing a forms application using Vue, these features may greatly improve your user experience and functionality.

This article will introduce the implementation method of table sorting and column hiding functions in Vue documents. We'll discuss some basic concepts on this topic and provide sample code.

1. Table sorting

Vue’s documentation contains code examples for implementing table sorting. There are three key concepts for implementing table sorting in Vue: data, calculated properties, and sorting functions.

1. Data

As shown in the following code, we need a data object that stores table data.

data: {
  tableData: [
    { name: 'John', age: 28, score: 85 },
    { name: 'Jane', age: 24, score: 90 },
    { name: 'Bob', age: 32, score: 76 },
    { name: 'Barbara', age: 29, score: 92 },
  ],
  sortKey: '', //现在排序的关键字
  reverse: false //排序方式
}

2. Computed Properties

Next, we need to use computed properties to sort based on the existing data. Computed properties are an important concept in Vue that allow you to automatically update the DOM when the data changes.

computed: {
  sortedTableData() {
    return this.tableData.sort((a, b) => {
      let modifier = 1;
      if (this.reverse) modifier = -1;
      if (a[this.sortKey] < b[this.sortKey]) return -1 * modifier;
      if (a[this.sortKey] > b[this.sortKey]) return 1 * modifier;
      return 0;
    });
  }
}

3. Sort function

Finally, we need to write a function to handle the click event of the header. When the user clicks on the header, we will call this function, passing the header name as parameter. The sort function will update the sortKey and reverse properties based on the passed values, thus triggering an update of the computed property.

methods: {
  sort(key) {
    this.sortKey = key;
    this.reverse = !this.reverse;
  }
}

The final HTML code is as follows:

<table>
  <thead>
    <tr>
      <th @click="sort('name')">Name</th>
      <th @click="sort('age')">Age</th>
      <th @click="sort('score')">Score</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="item in sortedTableData" :key="item.name">
      <td>{{ item.name }}</td>
      <td>{{ item.age }}</td>
      <td>{{ item.score }}</td>
    </tr>
  </tbody>
</table>

2. Column hiding

Another useful feature in Vue documentation is column hiding. If your table contains many columns, you may want to allow users to control which columns are visible.

There are two key concepts to implement column hiding: data and calculated properties.

1. Data

We need a data object that holds the status of the selected column.

data: {
  tableData: [
    { name: 'John', age: 28, score: 85 },
    { name: 'Jane', age: 24, score: 90 },
    { name: 'Bob', age: 32, score: 76 },
    { name: 'Barbara', age: 29, score: 92 },
  ],
  selectedColumns: [] //已选中的列
}

2. Computed Property

We need a calculated property to hide or show each column. Computed property returns an array of names of selected columns. Use the v-for directive to dynamically create th tags.

computed: {
  visibleColumns() {
    return ['name', 'age', 'score'].filter(column => !this.selectedColumns.includes(column));
  }
}

The final HTML code is as follows:

<table>
  <thead>
    <tr>
      <th v-for="column in visibleColumns" :key="column">{{ column }}</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="item in tableData" :key="item.name">
      <td v-if="!selectedColumns.includes('name')">{{ item.name }}</td>
      <td v-if="!selectedColumns.includes('age')">{{ item.age }}</td>
      <td v-if="!selectedColumns.includes('score')">{{ item.score }}</td>
    </tr>
  </tbody>
</table>

3. Summary

The above is an introduction to the implementation methods of table sorting and column hiding functions in Vue documents. These features provide a better interactive experience for your users and increase the functionality of your application. When implementing these features, be sure to use computed properties and methods to update the data and DOM. This will ensure your application remains synchronized and responsive at all times.

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