U.Helper

<input onkeyup="data_change(this)" ... >

document.getElementById('bdF17').onkeyup = function () {
data_change(this);
};

   1.
       function data_change(field)

document.getElementById('bdF17').onkeyup = function () {
data_change(this);
};
            {

                 var check = true;

                 var value = field.value; //get characters

                 //check that all characters are digits, ., -, or ""

                 for(var i=0;i < field.value.length; ++i)

                 {

                      var new_key = value.charAt(i); //cycle through characters

                      if(((new_key < "0") || (new_key > "9")) &&

                           !(new_key == ""))
   
                      {
    
                           check = false;
    
                           break;
    
                      }
    
                 }
    
                 //apply appropriate colour based on value
    
                 if(!check)
    
                 {
    
                      field.style.backgroundColor = "red";
    
                 }
    
                 else
   
                 {
    
                      field.style.backgroundColor = "white";
    
                 }
   
            }

field.style.backgroundColor = check ? "white" : "red";

function data_change (field) {
           var check = 1, value = field.value;
           for (var i = 0; i < field.value.length; ++i) {
                var new_key = value.charAt(i);
                if((new_key < 0 || new_key > 9) && !new_key == ''){
                     check = 0;
                     break;
                };
           };
           field.style.backgroundColor = check ? 'white' : 'red';
};

document.getElementById('bdF17').onkeyup = function () {
data_change(this);
};

<script type="text/javascript">
function data_change (field) {
            var check = 1, value = field.value;
            for (var i = 0; i < field.value.length; ++i) {
                 var new_key = value.charAt(i);
                 if((new_key < 0 || new_key > 9) && !new_key == ''){
                      check = 0;
                      break;
                 };
            };
            field.style.backgroundColor = check ? 'white' : 'red';
};
document.getElementById('bdF14').onkeyup = function () {
data_change(this);
};</script>

<input type="text" id="cl" value=""/>

document.getElementById("cl").onkeyup=function(){
var t=this;
t.value=t.value.match(/\d+/g);
}

<script>
document.getElementById("id инпута").onkeyup=function(){
var t=this;
t.value=t.value.match(/\d+/g);
}
</script>

<script>
document.getElementById("id инпута, id инпута2, id инпута3").onkeyup=function(){
var t=this;
t.value=t.value.match(/\d+/g);
}
</script>

$('node, node, node').bind('onkeyup', function () {
$(this).val($(this).val().match(/\d+/g))
});