The code attaches a keyup handler to the textarea with id textAlani, defines harfLimiti as 140, and uses sayac = $(this).val().length to count characters. It then updates #girilenHarf with the current count and #kalanHarf with harfLimiti - sayac, and if sayac exceeds harfLimiti it updates #uyari with a warning.

You need a textarea with id textAlani and elements with ids girilenHarf and kalanHarf to show the current and remaining character counts. The example also uses an element with id uyari to show the warning when the limit is exceeded.

harfLimiti stores the maximum allowed characters (140) and sayac stores the current character count derived from the textarea value. The logic compares sayac to harfLimiti to determine if more input is allowed.

The code runs when the document is ready using $(function () { ... }); to set up the keyup handler. This ensures the counters start working as soon as the page is ready.

If sayac exceeds harfLimiti, the code updates the element with id uyari to display the message You cannot enter more letters.... This provides a visible warning to the user.

Yes, by changing harfLimiti to your desired limit; the remaining count and the warning will adjust accordingly. The rest of the logic updates the current and remaining counts based on the new limit.

This approach uses only a simple HTML textarea and jQuery code to update counts in real time. No additional plugins are mentioned or required.

The remaining count is shown by updating the element with id kalanHarf with harfLimiti - sayac. This keeps the user informed of how many characters are left.