Скачать или смотреть How to Add an Auto Slash in Date Format Using Pure JavaScript

Learn how to automatically format your date input in a `yyyy/mm/dd` format using pure JavaScript with this simple guide. Follow our instructions to enhance your web forms!
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This video is based on the question https://stackoverflow.com/q/64589370/ asked by the user 'Jasmine Joseph' ( https://stackoverflow.com/u/8293365/ ) and on the answer https://stackoverflow.com/a/64589806/ provided by the user 'sbgib' ( https://stackoverflow.com/u/2687204/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Add an Auto Slash in Date Format Using Pure JavaScript

If you're developing a web application and want to improve user experience in your date input fields, automatically formatting the date as the user types can be incredibly helpful. This guide will guide you on automatically adding slashes to separate year, month, and day when users input a date, formatting it as yyyy/mm/dd. We will achieve this with simple and clean pure JavaScript code, while ensuring that after the date is complete, users cannot type any further characters.

The Problem

You may have encountered situations where users try to input dates in various formats — which can lead to confusion and errors. For instance, typically in date fields, users would enter 2000-12-30, but you want to enforce a specific format of yyyy/mm/dd.

Desired Behavior

As the user types, slashes / should automatically be added.

The input should restrict the user from entering more than the required digits for a valid date.

The initial format should be yyyy/mm/dd.

The Solution

Step-by-Step Guide

Here’s how you can implement this functionality using JavaScript:

Create the HTML Input Field
You need to set up a basic HTML input element in which the user can type the date.

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

Write the JavaScript Code
Below is the JavaScript code that implements the desired behavior:

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

Explanation of the Code

Selecting the Input Field: We first select the date input field by its ID.

checkValue Function: This function ensures that the month is between 1 and 12 and the day is correct, adjusting for invalid inputs.

Event Listener: We attach an input event listener to our date input that triggers every time the user types a character.

Input Formatting:

The input value is processed to replace any non-digit characters.

Based on the position (year, month, day), it applies the necessary checks and appends slashes after the year and month.

Final Value Assignment: We join all formatted segments back into a string and ensure the input only allows a total of 14 characters (e.g., YYYY/MM/DD).

Conclusion

By implementing the above steps, you enhance the functionality of your web applications by guiding users towards entering dates in a consistent format. This simplicity not only aids users in filling forms more accurately but also improves data quality in your applications.

Integrate this code into your project, and enjoy the seamless date inputs with proper formatting! If you have any questions or need further assistance, feel free to ask in the comments below.