How to Enable/Disable a jQuery Submit Button Based on Text Field Input?

Disabling and Enabling a jQuery Submit Button Based on Text Field Input

In a scenario where you require a submit button that's inactive when the corresponding text field is empty and becomes active once text is entered, the following steps provide a robust solution:

1. Disable the Submit Button Initially:

   $(document).ready(function() {
       $(':input[type="submit"]').prop('disabled', true);
   });

2. Monitor Text Field Changes using keyup Event:

   $('input[type="text"]').keyup(function() {
       // Check if the text field is not empty
       if($(this).val() != '') {
           // Enable the submit button
           $(':input[type="submit"]').prop('disabled', false);
       } else {
           // Disable the submit button
           $(':input[type="submit"]').prop('disabled', true);
       }
   });

3. Avoid change Event (Optional):
   The change event fires when focus is moved away from the input field, which may not be the desired behavior in this scenario. Using keyup instead ensures the button's reactivity to the input value as soon as a key is released, even if focus remains on the field.

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