Vue. How to get a value of a “key” attribute in created element

问题

I try to create a components and get its key for using in axios. Elements created, but I can't get a key. It's undefined

<div class="container" id="root">
    <paddock is="paddock-item" v-for="paddock in paddocks" :key="paddock.key" class="paddock">
    </paddock>
</div>
<script>
var pItem = {
    props: ['key'],
    template: '<div :test="key"></div>',
    created: function() {
        console.log(key);
    }
    };
new Vue({
    el: '#root',
    components: {
        'paddock-item': pItem
    },
    data: {
        paddocks: [
            {key: 1},
            {key: 2},
            {key: 3},
            {key: 4}
        ]
    }
})
</script>

I try some variants, but no result - @key was empty.

回答1:

This answer answers the question of how you would pass the key to a child component. If you just want to get the current key from inside the child component, use the highest voted answer.

key is a special attribute in Vue. You will have to call your property something else.

Here is an alternative using pkey instead.

console.clear()
var pItem = {
  props: ['pkey'],
  template: '<div :test="pkey"></div>',
  created: function() {
    console.log(this.pkey);
  }
};
new Vue({
  el: '#root',
  components: {
    'paddock-item': pItem
  },
  data: {
    paddocks: [{
        key: 1
      },
      {
        key: 2
      },
      {
        key: 3
      },
      {
        key: 4
      }
    ]
  }
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.4.2/vue.js"></script>
<div class="container" id="root">
  <paddock-item v-for="paddock in paddocks" :pkey="paddock.key" :key="paddock.key" class="paddock">
  </paddock-item>
</div>

回答2:

you don't need to use an extra attribute. You can get the key by

this.$vnode.key

来源：https://stackoverflow.com/questions/45852026/vue-how-to-get-a-value-of-a-key-attribute-in-created-element

标签

Vue.js

vuejs2

vue-component