How to Prevent Users from Entering Null Value in Angular DatePicker?

When building Angular forms with the Syncfusion DatePicker, it’s essential to ensure data integrity—especially when users clear the input field. A common requirement is to automatically reset the DatePicker to a default date if the field is cleared, preventing null or undefined values from being submitted.

This blog demonstrates how to implement this behavior using the change event and the dataBind() method in Syncfusion’s Angular DatePicker component.

🧩 Why Prevent Null in DatePicker?

Allowing a null value in a date field can lead to:

• Broken form validations
• Backend errors due to missing required fields
• Inconsistent user experience

By enforcing a default date, the form remains robust and user-friendly.

🛠️ Implementation: Set Default Date When Cleared

✅ Step-by-Step Code

Here’s how to configure the DatePicker to reset to a default date (e.g., February 7, 2025) when cleared:

import { isNullOrUndefined } from '@syncfusion/ej2-base'; 

<ejs-datepicker 
 #dp 
 strictMode="true" 
 format="dd/MM/yyyy" 
 placeholder="Enter date" 
 [value]="dateValue"
 (change)="onDateChange($event, dp)">
</ejs-datepicker> 

onDateChange(args: ChangedEventArgs, dp: any): void {
 if (isNullOrUndefined(args.value)) {
   dp.value = new Date("2/7/2025");
   dp.dataBind(); // Visually updates the DatePicker
 }
} 

📸 Visual Preview

Here’s how the DatePicker behaves before and after clearing the input:

🔍 Key APIs and Concepts

change: Triggers when the value changes in the DatePicker.
value: Sets or gets the selected date.
dataBind(): Forces the component to re-bind with the updated value.
isNullOrUndefined: Utility method to check for null or undefined values.

📚 Additional Resources

📘 Getting Started with Angular DatePicker
🧪 Live Demos
📖 API Reference

🧪 Try It Yourself

📦 Runnable Sample - Prevent Null in DatePicker

✅ Conclusion

Using the change event and dataBind() method, developers can ensure that the Syncfusion Angular DatePicker never submits a null value. This approach enhances form reliability and improves user experience by maintaining consistent and valid data.