Is there a way to reach my vue instance while inside a v-for iteration?

When using a v-for loop, I encounter an error:

<div v-for="index in 6" :key="index">
      <div class="card h-100" style="margin-top: 200px;">
        <a href="#">
          <img
            class="card-img-top"
            src="https://i.picsum.photos/id/345/700/400.jpg?hmac=oQMF95pIPaAEnln8qWEjerYF_2lcuFsfl_KnwjHnpXc"
            alt
          />
        </a>
        <div class="card-body">
          <h4 class="card-title">
            <a href="#"><p>{{ this.itemData[index].name }}</p></a>
          </h4>
          <p
            class="card-text"
          >Lorem ipsum dolor sit amet, consectetur adipisicing elit. Amet numquam aspernatur!</p>
        </div>
        <div class="card-footer">
          <small class="text-muted">&#9733; &#9733; &#9733; &#9733; &#9734;</small>
        </div>
      </div>
    </div>
  </div>
</div>

Despite being able to display the same line of code outside of the loop, I get a TypeError when trying to access this.itemData[0].price which is a property of the itemData[0] object. Your assistance on resolving this issue would be greatly appreciated!

javascriptjsonvue.js

Answer №1

If you encounter the error message 

TypeError: Cannot read property 'itemData' of undefined
, it is likely due to using the this. prefix within your template, which is not recommended.

An official ESLint plugin for vue has a rule specifically addressing this issue:

I hope this information proves helpful!

Answer №2

Helpful CodePen Example

v-for="index in 6" starts counting at 1 instead of 0: 1, 2, 3, 4, 5, 6.

Remember that arrays begin at index 0.

If you have an array with 6 elements, using itemData[6] will lead to an error as it does not exist. Even if it didn't result in an error, it would skip the first element in the array, itemData[0].

To fix this issue in your template, modify your binding to:

{{ itemData[index - 1].name }}

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