I pose the situation, I have a series of records that I can edit and I have a percentage field, so what I want is that at the time of editing I validate that I can not enter a lower percentage than the previous one, I edit and in the the text box appears 20 and if I put 10 do not leave me since it is smaller.
The functionality that I understood the show in the following example, I hope you can serve, greetings.
Look at this example with jquery :
var valorAnterior;
$(document).ready(function() {
valorAnterior = 0;
$("#porcentaje").change(function() {
$(".error").css("display", "none");
var valorNuevo = parseFloat($(this).val());
valorNuevo = isNaN(valorNuevo) ? 0 : valorNuevo;
if (valorAnterior == 0) {
valorAnterior = valorNuevo;
} else {
if (valorNuevo < valorAnterior) {
$(".error").text("El valor no puede ser Menor que " + valorAnterior);
$(".error").css("display", "block");
$("#porcentaje").val(0);
} else {
valorAnterior = valorNuevo;
}
}
});
});.error {
color: red;
}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
Porcentaje
<input id="porcentaje" />
<div class="error" style="display:none;"></div>