Warning: Use the ‘defaultValue’ or ‘value’ props on instead of setting ‘selected’ on

Warning: Use the ‘defaultValue’ or ‘value’ props on

instead of setting ‘selected’ on

When working with HTML forms and JavaScript, you may come across a warning in your console regarding the use of the ‘selected’ attribute on the element. This warning suggests using the ‘defaultValue’ or ‘value’ props on the element instead. In this blog post, we will explore why this warning is important and how to implement the suggested solutions.

The Problem

The ‘selected’ attribute is commonly used to preselect an option in a dropdown list. For example:

Option 1 Option 2

While this approach works, it can lead to a warning in the console:

Warning: Use the 'defaultValue' or 'value' props on  instead of setting 'selected' on 
  This warning is raised because setting ‘selected’ on the element directly is not the recommended way of preselecting an option. Instead, we should use the ‘defaultValue’ or ‘value’ props on the  element.

Solution 1: Using ‘defaultValue’
  The ‘defaultValue’ prop allows us to set the initial value of the  element. To preselect an option, we can set the ‘defaultValue’ prop to the desired option value:


  Option 1
  Option 2

This approach ensures that the desired option is selected by default without raising any warnings in the console.

Solution 2: Using ‘value’

Another way to preselect an option is by using the ‘value’ prop on the element. The ‘value’ prop should be set to the value of the desired option:

Option 1 Option 2

By setting the ‘value’ prop, the corresponding option will be selected by default, and the console warning will not be raised.

Conclusion

When preselecting an option in a dropdown list, it is important to use the ‘defaultValue’ or ‘value’ props on the element instead of setting ‘selected’ on the element. This ensures proper functionality and avoids console warnings. By following the recommended solutions provided in this blog post, you can confidently handle preselected options in your JavaScript applications.

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