Answers for "javascript input allow only number and +"

only numeric values are allow in input jquery

//allow a number in textbox using jQuery.
$('#valuepoints').keypress(function (e) {    
  var charCode = (e.which) ? e.which : event.keyCode;
  if (String.fromCharCode(charCode).match(/[^0-9]/g))
    return false;
});

type numeric value only in textbox javascript

function isNumber(evt) {
    evt = (evt) ? evt : window.event;
    var charCode = (evt.which) ? evt.which : evt.keyCode;
    if (charCode > 31 && (charCode < 48 || charCode > 57)) {
        return false;
    }
    return true;
}