In this article, we will focus on:
- Vuetify's data table component,
- How to optimize its performance when dealing with large datasets, and
- How to address the issue of slow rendering by implementing an infinite scroll feature.
Let's dive in!
1. Setting up the Vuetify Data Table
To begin, let's set up the Vuetify data table component. In the template section, we define the structure of the data table using the
v-data-table element. The
headers array specifies the columns' text and properties, while the
items property is bound to
itemsToDisplay. This array initially holds all the items, and we will optimize the rendering process in the following steps.
I have disabled pagination using
disable-pagination to implement infinite scroll and have used
hide-default-footer to hide the default footer of the data table
- Make sure you add the ref prop as shown below, as it will be used to access the table properties.
2. Generating Random Data
To simulate a large dataset, I created a
generateRandomItems() function that generates 100,000 random items. Each item has properties such as name, calories, fat, carbs, protein, iron, calcium, magnesium, and potassium. This allows us to have a realistic dataset to work with.
- This step only creates data for demonstration purposes and can be skipped in real use-case scenarios.
v-intersect to Load and Display Items
Before we implement infinite scroll, let's understand how the
v-intersect directive plays a role in loading and displaying items. The
v-intersect directive is a powerful feature provided by Vuetify that allows us to detect when an element enters or exits the viewport. We can use this directive to trigger actions based on scrolling behavior.
In the code snippet below, we use the
v-intersect directive to detect when the user is scrolling upward and trigger the
loadLess function. Similarly, we use the
v-intersect directive to detect when the user is scrolling downward and trigger the
body.prependslots are used to add loaders above and below the table body so that they will be displayed when scrolled.
4. Handling Visibility of
We utilized the
v-intersect directive to trigger the
loadLess functions on
body.prepend elements when they intersect the viewport while scrolling down or up, respectively. However, once these elements become visible, they need to be hidden again to ensure that
v-intersect can trigger the respective functions when they intersect the viewport during subsequent scrolling.
- For example, when
body.appendbecomes visible after executing
loadMore, we scroll the table to a row above using
scrollToRow. This action hides the
body.appendelement from the viewport. As a result, when the user scrolls down again,
body.appendwill intersect the viewport again, triggering the
loadMorefunction. The same principle applies to
5. Implementing Infinite Scroll
To address the performance issues related to rendering a large dataset, we implement infinite scroll. By updating the
itemEndIndex variables, we can control which subset of items should be displayed in the data table. This approach significantly improves performance by rendering only the visible items.
In this article, we explored how to enhance the performance of Vuetify data tables when dealing with large datasets. By implementing infinite scroll and leveraging the
v-intersect directive, we significantly improved rendering speed by dynamically loading and displaying data as the user scrolls.
Note that the abovementioned implementation assumes the scenario where all the items are loaded beforehand and displayed in the
v-data-table. However, the same approach can be modified to accommodate other use cases like the asynchronous fetching of items. By making a few adjustments, we can seamlessly integrate the infinite scroll behavior with the dynamic loading of data.
To explore the implementation and experiment with the code yourself, feel free to visit the following CodePen link: CLICK HERE