How to Detect Every Change to a Text Input Field with jQuery?-JS Tutorial-php.cn

How to Detect Every Change to a Text Input Field with jQuery?

Patricia Arquette

Release： 2024-11-02 11:15:30

Original

778 people have browsed it

How to Detect Every Change to a Text Input Field with jQuery?

Capturing Every Change to a Text Input with jQuery

Detect any modification to the value of an input text field, regardless of the method (e.g., keypresses, copy/paste, JavaScript edits, auto-completion). Ensure the change is registered immediately using jQuery.

Solution

Implement this robust and browser-compatible solution using jQuery's .bind():

$('.myElements').each(function() {
   let elem = $(this);

   // Store initial value
   elem.data('oldVal', elem.val());

   // Monitor value alterations
   elem.bind("propertychange change click keyup input paste", function(event) {
      if (elem.data('oldVal') != elem.val()) {
         elem.data('oldVal', elem.val());

         // Custom action upon change
         ...
      }
   });
});

Copy after login

Note: Replace '.myElements' with the selector for your input fields.

For jQuery versions 3.0 or later, use .on() instead of .bind():

$('.myElements').each(function() {
   let elem = $(this);

   // Store initial value
   elem.data('oldVal', elem.val());

   // Monitor value alterations
   elem.on("propertychange change click keyup input paste", function(event) {
      if (elem.data('oldVal') != elem.val()) {
         elem.data('oldVal', elem.val());

         // Custom action upon change
         ...
      }
   });
});

Copy after login

The above is the detailed content of How to Detect Every Change to a Text Input Field with jQuery?. For more information, please follow other related articles on the PHP Chinese website!