State Management

In plain words: The standard Salesforce <lightning-datatable> has a major quirk: if a user selects a few rows, types a word into a search bar to filter the list, and then clears the search, their original selections disappear! To fix this, you must write custom JavaScript to temporarily store the IDs of selected rows that are "hidden" by the filter, and merge them back when the filter is cleared. Displaying data in a tabular format is a standard requirement for almost any enterprise application. In Salesforce Lightning Web Components (LWC), the lightning-datatable component makes this easy. However, combining row selection with dynamic front-end filtering introduces a frustrating state-management problem. Because filtering replaces the data bound to the datatable, any previously selected records that no longer match the search term are "forgotten" by the component. Let's walk through how to build a smart, stateful datatable that rem...

In plain words: When you use a paginated <lightning-datatable> in Salesforce, clicking "Next Page" completely refreshes the table's data. Because of this, any rows the user checked on Page 1 will be forgotten by the time they get back. To fix this, we must write custom JavaScript to save the IDs of selected rows into a "master list" behind the scenes, and then re-apply those selections every time the page changes. Displaying large datasets in Lightning Web Components (LWC) requires pagination to maintain performance. However, out-of-the-box, the lightning-datatable component does not remember selected rows when the underlying data changes. In this tutorial, we will build a custom datatable with "Previous" and "Next" pagination buttons that flawlessly remembers user selections across pages.