javascript验证

Question

I am facing some problem in javascript validation condition is I need to update the date in a textbox and that date should'nt be backdated from the applicationdate, if I update the date as backdate from the applicationdate ill get the alert masg E-CLRDATELTTXNDATE.issue is if I click on any text box linked to that date textbox this alert is keep on repeating even if I click on ok button of this alert window.

   function txtClearingDate_blur(i) {
        i--;
        if (document.frmPaymentClearing.hidTxnCount.value == 1) {
        if (("" + document.frmPaymentClearing.txtClearingDate.value).length > 0) {
                    if (!isDate(document.frmPaymentClearing.txtClearingDate.value,document.frmPaymentClearing.hidShortDateFormat.value,document.frmPaymentClearing.hidDateSeperator.value)) {
document.frmPaymentClearing.txtClearingDate.focus();return;
                         } else {
                                i++;
                    if (isClearingDateGreaterThanAppdate(i--)) {
                                        document.frmPaymentClearing.txtClearingDate.focus();
                        GetAlertMessage("E-CLRDATE","E","","","");
                     }
                                 i++;
                    if (!isClearingDateGreaterThanTxnDate(i--)) {
                        document.frmPaymentClearing.txtClearingDate().focus();

                        GetAlertMessage("E-CLRDATELTTXNDATE","E","","","");

                    }


                    }
                }
            } else {
                if (("" + document.frmPaymentClearing.txtClearingDate[i].value).length > 0) {
                    if (!isDate(document.frmPaymentClearing.txtClearingDate[i].value,document.frmPaymentClearing.hidShortDateFormat.value,document.frmPaymentClearing.hidDateSeperator.value)) {
                                       document.frmPaymentClearing.txtClearingDate[i].focus();return;
                                } else {
                                        i++;
                    if (isClearingDateGreaterThanAppdate(i--)) {
                                                   document.frmPaymentClearing.txtClearingDate[i].focus();
                               GetAlertMessage("E-CLRDATE","E","","","");
                    }

                    i++;
                    if (!isClearingDateGreaterThanTxnDate(i--)) {
                        document.frmPaymentClearing.txtClearingDate(i).focus();
                        GetAlertMessage("E-CLRDATELTTXNDATE","E","","","");
                        return;
                    }

                    }

                }

            }
        }

HTML:

<%If strFormState = "NEXTDISPLAY" Then%>
<INPUT type="text" name="txtClearingDate" size=10 value='<%=FormatDateTime(IIF(IsDBNull(rstPaymentRecs.fields.Item("ClearingDate").Value), Nothing, rstPaymentRecs.fields.Item("ClearingDate").Value), 2)%>' onblur="txtClearingDate_blur((<%=i%>))">
<INPUT type="hidden" name="hidTxnDate" size=10 value='<%=FormatDateTime(IIF(IsDBNull(rstPaymentRecs.fields.Item("TransactionDate").Value), Nothing, rstPaymentRecs.fields.Item("TransactionDate").Value), 2)%>'">
<%Else%>
<INPUT type="text" name="txtClearingDate" size=10 value='<%=FormatDateTime(objSecurityContext.Appdate, 2)%>' onblur="txtClearingDate_blur(<%=i%>)">
<INPUT type="hidden" name="hidTxnDate" size=10 value='<%=FormatDateTime(IIF(IsDBNull(rstPaymentRecs.fields.Item("TransactionDate").Value), Nothing, rstPaymentRecs.fields.Item("TransactionDate").Value), 2)%>'">
<%End If%>

Answer 1

It's because of .focus() event you call before alerting error message. Place it after alert call.

Field receives focus then loses it on alert, blur event fired again on not changed data.