How can you access the index of an object in Vue.js when one of its properties has been modified

Question

How can you access the index of an object in Vue.js when one of its properties has been modified

Here's the Vue component code I'm working with:

data: function () {
    return {   
        products: [ 
            { product_id: '', price: ''}, 
            { product_id: '', price: ''},  
        ],
    }
},

I am looking for a solution to get the object index when the v-model="product_id" is changed. Is there any way to achieve this?

<div v-for="(product, key) in products">
    <input type="text" v-model="product.product_id" />
    <input type="text" v-model="product.price" />
</div><!--  /.div -->

Any help will be greatly appreciated. Thank you!

javascript vue.js

Answer 1

Answer №1

Instead of complicating things, why not just include a method that triggers when the @change event occurs?

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: 'Learn JavaScript' },
      { text: 'Learn Vue' },
      { text: 'Play around in JSFiddle' },
      { text: 'Build something awesome' }
    ]
  },
  methods: {
    getIndex(index) {
    console.log(index)
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <div v-for="(todo, index) in todos" @key="index">
    <input type="text" v-model="todo.text" @change="getIndex(index)">
  </div>
</div>

Answer 2

Instead of complicating things, why not just include a method that triggers when the @change event occurs?

new Vue({
  el: "#app",
  data: {
    todos: [
      { text: 'Learn JavaScript' },
      { text: 'Learn Vue' },
      { text: 'Play around in JSFiddle' },
      { text: 'Build something awesome' }
    ]
  },
  methods: {
    getIndex(index) {
    console.log(index)
    }
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.5.17/vue.js"></script>

<div id="app">
  <div v-for="(todo, index) in todos" @key="index">
    <input type="text" v-model="todo.text" @change="getIndex(index)">
  </div>
</div>

Answer 3

Answer №2

Check out this resource: findIndex

data() {
    return {
    items: {  
            item_list: [ 
                { id: '1', cost: '50'}, 
                { id: '2', cost: '93'},  
            ],
            additional_field: '',
    },
  }
},
watch: {
    'items.item_list.id'(newId) {
    this.items.additional_field = this.items.item_list.findIndex(item => item.id == newId)
  }
}

Answer 4

Check out this resource: findIndex

data() {
    return {
    items: {  
            item_list: [ 
                { id: '1', cost: '50'}, 
                { id: '2', cost: '93'},  
            ],
            additional_field: '',
    },
  }
},
watch: {
    'items.item_list.id'(newId) {
    this.items.additional_field = this.items.item_list.findIndex(item => item.id == newId)
  }
}

Answer 5

Answer №3

One way to implement this functionality is by using a watch function in Vue.js:

watch: {
   'products.product': {
       handler(newValue, oldValue) {
           // Check if the value has changed
           if(newValue != oldValue) {
              // Identify the row that was modified
              let [rowChanged] = _.difference(newValue, oldValue);
              // Find the index of the modified row
              let arrayIndex = newValue.indexOf(rowChanged);
           }  
       },
       deep: true
   }
}

This code snippet demonstrates how to achieve the desired behavior. Additionally, you can consolidate all your code into a jsfiddle for better visualization of the entire .vue component.

Answer 6

One way to implement this functionality is by using a watch function in Vue.js:

watch: {
   'products.product': {
       handler(newValue, oldValue) {
           // Check if the value has changed
           if(newValue != oldValue) {
              // Identify the row that was modified
              let [rowChanged] = _.difference(newValue, oldValue);
              // Find the index of the modified row
              let arrayIndex = newValue.indexOf(rowChanged);
           }  
       },
       deep: true
   }
}

This code snippet demonstrates how to achieve the desired behavior. Additionally, you can consolidate all your code into a jsfiddle for better visualization of the entire .vue component.

How can you access the index of an object in Vue.js when one of its properties has been modified

Answer №1

Answer №2

Answer №3

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