How to compare two input values onkey jquery

Question

I have a form with two input fields.

<input type="text" id="first" value="">
<input type="text" id="second" value="">

I have tried this but no success

<script>
$(function(){
    var fst=$("#first").val();
    var sec=$("#second").val();
    if (sec>fst) {
        alert("Second value should less than first value");
        return true;
    }
})
</script>

How to allow only second input values are only numbers and also less than the first input

Some code examlpes are highly appreciated!

ibrahim mahrir
– ibrahim mahrir

2017-04-16 22:57:44 +00:00
Commented Apr 16, 2017 at 22:57 — ibrahim mahrir
– ibrahim mahrir, Commented Apr 16, 2017 at 22:57

Neil · Accepted Answer · 2017-04-16 23:05:49Z

2

You seem to be missing the key up event.

$(function(){
  $("#first, #second").on("keyup", function () {
    var fst=$("#first").val();
    var sec=$("#second").val();
    if (Number(sec)>Number(fst)) {
      alert("Second value should less than first value");
    return true;
    }
  })
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="text" id="first" value="">
<input type="text" id="second" value="">

answered Apr 16, 2017 at 23:05

Neil

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2 Comments

krishna Over a year ago

Thanks it's working, instead of alert, the second element values should not be allowed onkeyup

Neil Over a year ago

You'd be better off alerting the user through a div because just not allowing it leads to very obnoxious behavior.

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