Incorporating interactive checkboxes into a user roster using Vue

Question

Incorporating interactive checkboxes into a user roster using Vue

I've encountered a common scenario where I need to display data from a REST service in a table using Vue, but I'm struggling to find examples on how to make it work.

When fetching a list of users and showing them in a table, I face an issue with adding a "checked" attribute dynamically. Here's a simplified version:

<tr v-for="guser in filteredUsers" class="group_user">
    <td><input type="checkbox" v-bind="guser.checked"></td><td>{{guser.username}</td>
</tr>

The problem arises from the fact that the "checked" attribute is not part of the user object retrieved from the backend. Therefore, I need to add it on the client side after fetching the data. This approach makes sense since the backend doesn't need to know about this frontend functionality.

However, I'm facing difficulties with the binding of v-bind="guser.checked". It seems that any attribute bound to a form control needs to be predefined when declaring the objects. But how can I achieve this for a dynamic list of N objects received from the server?

If anyone has advice or insights on this matter, I would greatly appreciate it. Thank you!

javascript vue.js vuejs2

Answer 1

Answer №1

Ensure to include the checked property in your user objects once they are fetched using AJAX.

console.clear()

// simulated data from the server
const users = [
  {id: 1, username: "Bob"},
  {id: 1, username: "Mary"},
]

new Vue({
  el: "#app",
  data:{
    users:[]
  },
  computed:{
    filteredUsers(){
      // simulate filtered users
      return this.users
    }
  },
  methods:{
    getUsers(){
      // simulate an ajax call with setTimeout
      setTimeout(() => {
        // add a checked property to the retrieved user objects and assign the result to users array
        this.users = users.map(u => Object.assign({}, u, {checked: false}))
      }, 250)
    }
  },
  created(){
    this.getUsers()
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<div id="app">
  <table>
    <tr v-for="guser in filteredUsers" class="group_user">
      <td><input type="checkbox"v-model="guser.checked"></td>
      <td>{{guser.username}}</td>
    </tr>
  </table>
  {{users}}
</div>

If it doesn't seem to work initially, it might be due to Vue's inability to detect dynamically added properties to an object after being added to Vue. Another approach would be utilizing the $set method for adding properties (instead of Object.assign as demonstrated).

Answer 2

Ensure to include the checked property in your user objects once they are fetched using AJAX.

console.clear()

// simulated data from the server
const users = [
  {id: 1, username: "Bob"},
  {id: 1, username: "Mary"},
]

new Vue({
  el: "#app",
  data:{
    users:[]
  },
  computed:{
    filteredUsers(){
      // simulate filtered users
      return this.users
    }
  },
  methods:{
    getUsers(){
      // simulate an ajax call with setTimeout
      setTimeout(() => {
        // add a checked property to the retrieved user objects and assign the result to users array
        this.users = users.map(u => Object.assign({}, u, {checked: false}))
      }, 250)
    }
  },
  created(){
    this.getUsers()
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.13/vue.js"></script>
<div id="app">
  <table>
    <tr v-for="guser in filteredUsers" class="group_user">
      <td><input type="checkbox"v-model="guser.checked"></td>
      <td>{{guser.username}}</td>
    </tr>
  </table>
  {{users}}
</div>

If it doesn't seem to work initially, it might be due to Vue's inability to detect dynamically added properties to an object after being added to Vue. Another approach would be utilizing the $set method for adding properties (instead of Object.assign as demonstrated).

Incorporating interactive checkboxes into a user roster using Vue

Answer №1

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