How to clear data for scope.row in vue

Vue.js is a popular JavaScript framework for creating interactive user interfaces. In Vue.js, we usually use the v-for directive to iterate over an array or object, and use the scope object to refer to the current data item. However, when we need to clear or reset the data of a scope object under certain circumstances, we need some skills.

In Vue.js, we can modify or update the scope object through Vue's instantiation method ($set) or JavaScript's built-in method (Object.assign). When we need to clear or reset the data of the scope object, we can use the $delete method of the Vue instance or the built-in method of JavaScript (Object.assign).

The following are some examples showing how to clear or reset scope object data through the $delete method of Vue.js and the Object.assign method of JavaScript.

Clear data through the $delete method

The $delete method is one of the built-in methods of the Vue.js instance and can be used to delete specified attributes from the data object. When using the v-for instruction to traverse the data collection, we can use the $delete method to clear the properties of the current data object.

For example, suppose we have an array users and use the scope object in the v-for directive to reference the data items of each user:

<template>
  <div>
    <table>
      <thead>
        <tr>
          <th>ID</th>
          <th>名称</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(user, index) in users" :key="user.id">
          <td>{{user.id}}</td>
          <td>{{user.name}}</td>
          <td>{{user.age}}</td>
          <td>{{user.gender}}</td>
          <td>
            <button @click="resetData(index)">重置数据</button>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      users: [
        {id: 1, name: '张三', age: 18, gender: '男'},
        {id: 2, name: '李四', age: 20, gender: '女'},
        {id: 3, name: '王五', age: 22, gender: '男'}
      ]
    }
  },
  methods: {
    resetData(index) {
      const user = this.users[index]
      this.$delete(user, 'age') // 删除age属性
      this.$delete(user, 'gender') // 删除gender属性
    }
  }
}
</script>

In the above example, we can see The resetData method uses the $delete method to delete the age and gender attributes of the current data item. This will clear the data in the scope object, returning it to undefined.

Reset data through the Object.assign method

In addition to using the $delete method, we can also use the JavaScript built-in method Object.assign to reset or clear the scope object. data. The Object.assign method is used to copy all enumerable properties of the source object to the target object.

For example, assuming our user data item consists of multiple properties, we can use the Object.assign method to reset all properties to their default values:

<template>
  <div>
    <table>
      <thead>
        <tr>
          <th>ID</th>
          <th>名称</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(user, index) in users" :key="user.id">
          <td>{{user.id}}</td>
          <td>{{user.name}}</td>
          <td>{{user.age}}</td>
          <td>{{user.gender}}</td>
          <td>
            <button @click="resetData(index)">重置数据</button>
          </td>
        </tr>
      </tbody>
    </table>
  </div>
</template>

<script>
export default {
  data() {
    return {
      users: [
        {id: 1, name: '张三', age: 18, gender: '男'},
        {id: 2, name: '李四', age: 20, gender: '女'},
        {id: 3, name: '王五', age: 22, gender: '男'}
      ]
    }
  },
  methods: {
    resetData(index) {
      const user = this.users[index]
      Object.assign(user, {age: 0, gender: ''}) // 重置属性值
    }
  }
}
</script>

In the above example, we Use the Object.assign method to reset the age and gender properties to 0 and '' to clear the data for the current data item.

Whether using the $delete method or the Object.assign method, we can clear or reset the data of the scope object in Vue.js. These techniques can help us manage data collections effectively and ensure that our data is always under control.

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