Скачать или смотреть How to Trigger a Method in Vue.js When Input Loses Focus

Learn how to effectively handle input events in Vue.js by triggering a save method only when an input field loses focus, enhancing user experience in your application.
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This video is based on the question https://stackoverflow.com/q/64428021/ asked by the user 'AliAzra' ( https://stackoverflow.com/u/7520496/ ) and on the answer https://stackoverflow.com/a/64428332/ provided by the user 'Excalibaard' ( https://stackoverflow.com/u/11532124/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Managing Input Events in Vue.js: Save on Blur

In modern web applications, managing user input effectively is critical for a smooth user experience. If you've ever implemented an input field that saves data on each keystroke, you may have encountered a frustrating issue: your save method is triggered multiple times while the user is typing instead of once when they finish. Let’s explore how to resolve this problem in a Vue.js component setup.

The Input Problem

Imagine you have a shopping cart on your website where users can enter quantities for products. The issue arises when each character typed into the quantity input field triggers a save action in the app, calling the save method multiple times for a single change. For instance, entering 123 could result in three separate save calls. This is less than ideal since you want to save the quantity only once, right after the user has finished typing.

Solution: Listening to the Blur Event

The key to solving this problem is knowing which event to listen for. Instead of using the input event, you should be using the blur event. Let's break this down:

Why blur?

The input event activates every time the value of the input changes. This includes each keystroke when a user types in the field.

The blur event, on the other hand, only triggers when the input field loses focus. This means that once the user clicks away from the input, your save action can occur without redundant calls.

Updates to Your Code

To implement this fix, you need to perform two steps in your Vue.js component:

Change the event listener from input to blur:
Modify your component to listen to the blur event instead of input, like this:

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

Update your component call to use the new blur event:
Wherever you call your component, make sure it listens for the blur event. Here’s how you could update it:

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

The Method Adjustment

Next, ensure your updateItemQuantity method allows for this blur event and handles the server-side update accordingly. The modified function would look like this:

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

Important Considerations

Separate Client-Side and Server-Side State: It's vital to maintain a distinction between what the user sees and what is saved in the database.

Allow for real-time changes to be reflected in the item.quan while ensuring that it's only the blur event that updates the database.

If you make changes only on blur, be cautious that users see the changes they're making without delay.

Conclusion

By listening for the blur event in your Vue.js input fields, you can significantly enhance the user experience. Instead of overwhelming your application with redundant save requests as the user types, you can make the save action more efficient and user-friendly, triggering it only once when the user is done inputting their quantity. This small but significant change can make a huge difference in your application's performance and usability.

With these adjustments made, you should have a smoother shopping cart experience that keeps users happy and your backend efficient!