Prevent negative inputs in form input type=“number”?

Question

I want to restrict user input to positive numbers in an html form.

I know you can set min=\"0\", however it is possible to bypass this by manually entering a negati

Answer 1

The following script will only allow numbers or a backspace to be entered into the input.

var number = document.getElementById('number');

number.onkeydown = function(e) {
    if(!((e.keyCode > 95 && e.keyCode < 106)
      || (e.keyCode > 47 && e.keyCode < 58) 
      || e.keyCode == 8)) {
        return false;
    }
}