Check inputfield for numbers

Question

I have an input field and I want to check the value, if there are only numbers in it. When not, there must come an error message or something like this and the user must change the entry.
I made the input field, with the following coding:
    <htmlb:gridLayoutCell columnIndex       = "2"
                          rowIndex          = "1"
                          verticalAlignment = "middle" >
      <htmlb:inputField id         = "days"
                        size       = "4"
                        maxlength  = "4"
                        required   = "TRUE"
                        doValidate = "TRUE"
                        value      = "<%= days %>"
                        tooltip    = "<%= otr(z_lief_portal/tage_l) %>"
                        type       = "STRING"
                        alignment  = "center"
                        disabled   = "false" />
    </htmlb:gridLayoutCell>
How can I check the field days?
Regards
Jens

Answer 1

Here is the complete code for your case.
<%@page language="abap" %>
<%@extension name="htmlb" prefix="htmlb" %>
<%@extension name="bsp" prefix="bsp" %>
<SCRIPT LANGUAGE="JavaScript">
function chkNumeric(objName,fslash,hyphen)
// only allow 0-9 be entered, plus any values passed
var checkOK = "0123456789" + fslash + hyphen;
var checkStr = objName;
var allValid = true;
var decPoints = 0;
var allNum = "";
for (i = 0;  i < checkStr.value.length;  i++)
ch = checkStr.value.charAt(i);
for (j = 0;  j < checkOK.length;  j++)
if (ch == checkOK.charAt(j))
break;
if (j == checkOK.length)
allValid = false;
break;
if (ch != ",")
allNum += ch;
if (!allValid)
alertsay = "Please enter only these values ""
alertsay = alertsay + checkOK + "" in the "" + checkStr.name + "" field."
alert(alertsay);
return (false);
</script>
<htmlb:content design="design2003" >
  <htmlb:page title="detail " >
    <htmlb:form>
      <%
  tmp_string =`<input onBlur="javascript:chkNumeric(this,'/','-');"`.
      %>
      <bsp:findAndReplace find    = "<input"
                          replace = "<%= tmp_string %>" >
        <htmlb:inputField id        = "myInputField2"
                          value     = "12345"
                          alignment = "left" />
      </bsp:findAndReplace>
    </htmlb:form>
  </htmlb:page>
</htmlb:content>
Regards
Raja