Detailed explanation of how to synchronize data on Vue table update page

Vue is a popular JavaScript framework that has been widely used in front-end development. During the development process, we usually need to use tables to display data. When the data is updated, we hope that the page can be updated synchronously to ensure the user experience. So in Vue, how does the table achieve synchronous update of data?

1. Vue’s responsive mechanism

The core idea of ​​Vue is responsive programming, that is, when the data changes, the page will automatically update. Vue takes advantage of the Object.defineProperty method in ES6 to add a getter and setter function for each property. When the data changes, the setter function will be triggered and the page will be re-rendered.

2. Data binding of tables in Vue

In Vue, we can render data into the table through the v-for instruction. For example:

<table>
  <thead>
    <tr>
      <th>姓名</th>
      <th>年龄</th>
    </tr>
  </thead>
  <tbody>
    <tr v-for="(item,index) in userList" :key="index">
      <td>{{item.name}}</td>
      <td>{{item.age}}</td>
    </tr>
  </tbody>
</table>

Among them, userList is an array we defined, containing all the data that needs to be displayed.

3. Synchronous update of table data

When we modify userList, the page will not be updated immediately. In order to achieve synchronous updates, we can use the watch method provided by Vue to monitor data changes and manually update the page after the data modification is completed.

1. Define data in data

In the Vue component, we first need to define the data object used to store table data.

data() {
  return {
    userList: [
      {name: '张三', age: 25},
      {name: '李四', age: 30},
      {name: '王五', age: 28},
    ]
  }
},

2. Monitor data changes

Next, we need to use the watch method provided by Vue to monitor changes in userList.

watch: {
  userList: function () {
    this.$nextTick(() => {
      //表格数据更新后，手动更新页面
      this.$forceUpdate();
    });
  },
},

Here, we use the this.$nextTick() method to ensure that the page has been rendered after the table data is updated. Then, manually call this.$forceUpdate() method to force the page to re-render.

3. Modify data

Finally, we can modify the data in userList through the functions provided by Vue. For example:

this.userList[0].age = 26;

At this time, Vue will automatically trigger the watch method and update the table data in the page.

To sum up, Vue is very simple to implement synchronous update of table data. You only need to use the watch method to monitor data changes and manually call this.$forceUpdate() method to achieve synchronous data update.

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