Aim: To call a js method when an lightning input text is filled in LWC form. Eg: After typing Salesforce and moving out the field should invoke the JS function.

<lightning-input label="Email" type="email" required onchange={onUserEmailChnage}></lightning-input>

By using lightning-input's onchange function, JS function is being called after typing each and every alphabet like s, sa etc are sending to JS function instead of sending Salesforce.

<lightning-input label="Email" type="email" required onblur={onUserEmailChnage}></lightning-input>

When I use 'onfocus' or 'onblur' instead of 'onchange' getting an Error as attached.OnBlur/OnFoucs

Can anyone help me on building a functionality which should call JS function when complete word is typed.

  • 1
    Is the handler function name correct : onUserEmailChnage or is it onUserEmailChange ? You have interchanged few letters.
    – Rohit
    Commented Feb 22, 2023 at 11:50

3 Answers 3


Tried above scenario on lightning playground and it works fine.

Markup code :

<lightning-input type="email" label="Email address" required onblur={onUserEmailChnage}></lightning-input>

js code :

onUserEmailChnage(event) {
        console.log('input value ',event.target.value);

onBlur will fire when user focus moves away from the input element which should be correct given the use case.

  • Thank you. I have used event.detail.value on js which is reason for the error.
    – Rv1
    Commented Feb 22, 2023 at 12:17
  • Please mark it as the answer if it solved your problem.
    – Rohit
    Commented Feb 22, 2023 at 12:18

onblur and onchange also don't fire on aura cmp, if the type is email. Works well if type is not stated which means string.


extend when you use lightning-input-field


<lightning-input-field name="lname" field-name="LastName" onfocusin={handleInputFocus}></lightning-input-field>


<lightning-input-field name="lname" field-name="LastName" onfocusout={handleInputFocus}></lightning-input-field>


    handleInputFocus(event) {

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