Automatically Call Fetch API on RNPickerSelect Value Change in React Native

Learn how to `automatically call a fetch API` when a dropdown value changes in React Native using RNPickerSelect. This guide provides a clear approach to achieve dynamic data fetching based on state values.
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Automatically Call Fetch API on RNPickerSelect Value Change in React Native

When building applications with React Native, you may find yourself needing to update API calls based on user selections from dropdown menus. For instance, if you're using the RNPickerSelect component, you might want to call a function to fetch data whenever a user selects a different value. In this guide, we'll explore a solution to automatically call your fetch API function getDieselRequisitionList without explicitly triggering it within the onValueChange event.

The Problem Statement

You have a task at hand: you want to automatically invoke the getDieselRequisitionList function whenever a user selects a value from any of your dropdowns, all implemented using RNPickerSelect. This is a common scenario in many applications that require dynamic data loading based on user inputs. The challenge arises because you do not want to call the function directly within the onValueChange handler for each dropdown.

Our Solution

Step 1: Set Up State Management

First and foremost, you need to ensure that the component handles its state effectively. Typically, you will have a state that manages the selected values for each dropdown. In this case, let’s assume you have three dropdowns to manage: selectedStatus, selectedYear, and selectedMonth.

Step 2: Listen to Value Changes

You can efficiently listen for changes using onValueChange from the RNPickerSelect. This handler will allow you to detect when the user selects a value. Below is how you can implement this:

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

Explanation of the Code

Updating State: We first update the component’s state with the newly selected year and its corresponding index.

Fetching Data: Finally, it triggers the method getDieselRequisitionListOnChange, passing along necessary parameters that represent the current selections.

Step 3: Repeat for Other Dropdowns

You’ll want to implement a similar logic for your other dropdowns as well, ensuring that all necessary data fetching functions are called when their respective values change. This approach guarantees that everything remains synchronized with what the user selects.

Conclusion

By following the steps above, you can achieve automatic fetch calls in your React Native application using RNPickerSelect. This method removes the need to manually call functions in the onValueChange event, allowing for cleaner and more maintainable code. This will enhance the user experience by ensuring that the displayed data is always up-to-date with their selections.

Now, go ahead and implement this functionality to make your app even more dynamic and responsive to user interactions!