JavaScript 在页面上为所有textareas强制执行maxlength

Posted 2021-05-20

$('textarea').keyup(function () {
	var max = 4000;
	if ($(this).val().length > max) {
		$(this).val($(this).val().substr(0, max));
	}

	$(this).parent().find('.chars_remaining').html('You have ' + (max - $(this).val().length) + ' characters remaining').show();
});

//hide chars remaining count on blur
$('textarea').blur(function () { $('.chars_remaining').fadeOut('fast'); });

//and in the front end:
<span class="chars_remaining ui-state-highlight"></span>