Скачать или смотреть How to Easily Get the Length of a Property in Vue.js: A Guide to Filtering JSON Arrays

Learn how to count occurrences of specific properties in JSON using Vue.js with a simple example. Perfect for beginners to understand filtering in arrays!
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This video is based on the question https://stackoverflow.com/q/76204473/ asked by the user 'jibzy' ( https://stackoverflow.com/u/18198067/ ) and on the answer https://stackoverflow.com/a/76204525/ provided by the user 'Nikola Pavicevic' ( https://stackoverflow.com/u/11989189/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Easily Get the Length of a Property in Vue.js

When working with JSON data in Vue.js, you might often find yourself needing to count specific occurrences of a property. For example, if you have a list of orders, you may want to know how many have been delivered. In this guide, we'll explore how to get the length of a particular status, specifically “delivered,” from a JSON array using Vue.js.

Understanding the Problem

Imagine you receive the following JSON data representing the status of several orders:

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You need to determine how many times the status “delivered” appears in this JSON. The answer, in this case, is 2. Furthermore, you might want to do the same for other statuses like “cancelled” or “on Delivery.”

Breaking Down the Solution

To solve the problem of counting occurrences in your Vue.js component, we can utilize JavaScript's array methods. Specifically, we'll use the filter() method, which allows us to create a new array based on a specific condition and then get its length.

Step-by-Step Implementation

Setting Up Your Vue Component: First, ensure you have a Vue component that fetches the orders.

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Code

Data Property: The orders property will hold the array fetched from the API.

Created Lifecycle Hook: This hook fetches the data from the API as soon as the component is created.

Computed Properties: deliveredCount and cancelledCount are computed properties that call getStatusCount, passing in the relevant status to count.

Method Implementation:

The getStatusCount(status) method filters the orders array based on the status provided and returns the length of the resulting array.

A check is included to return 0 if orders is not yet loaded.

Conclusion

Counting specific properties in a JSON array in Vue.js is straightforward using the filter() method to get the desired results. By organizing your code with computed properties and methods, you can easily maintain and extend the functionality for counting other statuses.

Now you can keep track of your order statuses efficiently and even extend this approach to other application needs. Happy coding!