Question

js:

 $(".test").focusout(function(){
    var qtdCont = parseInt($(this).val());
      if(qtdCont > 0)
      {
         var qtdProd     = $(".value").val();
         var qtdProdInt  = parseInt(qtdProd);
         var qtdProdTot  = qtdProd-qtdCont;
         $(".value").val(qtdProdTot);
      }
 });

Demo: Jsfiddle

i need the subtract only the fist time when he lose the focus.

because if u go’s back and focusout again, the subtraction (obviously) will happen again.

how can i control that ?

thank you.

Answer 1

Use the data in the dom element:

$(".test").focusout(function(){
     var qtdCont = parseInt($(this).val());
    if(qtdCont > 0 && $(this).data('done') == undefined)
    {
         var qtdProd     = $(".value").val();
         var qtdProdInt  = parseInt(qtdProd);
         var qtdProdTot  = qtdProd-qtdCont;
         $(".value").val(qtdProdTot);
        $(this).data('done', true);
     }
});

Fiddle: http://jsfiddle.net/dNEmD/19/

UPDATE

$(".test").focusout(function(){
     var qtdCont = parseInt($(this).val());
    if(qtdCont > 0 && 
         ($(this).data('done') == undefined || $(this).data('done') == false))
    {
         var qtdProd     = $(".value").val();
         var qtdProdInt  = parseInt(qtdProd);
         var qtdProdTot  = qtdProd-qtdCont;
         $(".value").val(qtdProdTot);
        $(this).data('done', true);
     }
});

$(".test").change(function(){ //if value was changed
     $(this).data('done', false);
});

Fiddle: http://jsfiddle.net/dNEmD/27/