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How to delete the default value of an input text on click with JavaScript?

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Sometimes, we want to delete the default value of an input text on click with JavaScript.

In this article, we’ll look at how to delete the default value of an input text on click with JavaScript.

How to delete the default value of an input text on click with JavaScript?

To delete the default value of an input text on click with JavaScript, we can set the value of the input to the default by setting the value attribute and using the defaultValue property.

For instance, we write:

<input type="text" value="[some default value]" />

to set the value attribute to set the defaultValue property of the input.

Then we write:

const onBlur = (e) => {
  if (e.target.value === '') {
    e.target.value = e.target.defaultValue;
  }
}
const onFocus = (e) => {
  if (e.target.value === e.target.defaultValue) {
    e.target.value = '';
  }
}

const input = document.querySelector('input')
input.addEventListener('focus', onFocus)
input.addEventListener('blur', onBlur)

to add the onBlur and onFocus functions which runs when we focus away and in the input respectively.

In the onBlur function. we set the value of the input to the defaultValue.

And in onFocus, we set the input’s value to an empty string if it’s the same as the defaultValue.

e.target is the input since we call addEventListener on the input that we selected with document.querySelector.

Conclusion

To delete the default value of an input text on click with JavaScript, we can set the value of the input to the default by setting the value attribute and using the defaultValue property.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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