How to make a text field required at run time when the user clicks the checkbox ?

I got a form where , there are several checkboxes and text fields associated with that checkboxes.If the use clicks on the check box then the associated
text fields should become required.I have tried the change event and the click event for the checkboxes.It gives error in the onChnage event and I got some weird results in the on click event .Sometimes if the user click the check box , then for the 1st time the field doesnt become required , then the user onclicks the check box and when the user clicks the checkbox for the second time the field becomes required,but if i deselects the highlighted field option and selects it again the field becomes required even if the user onchecks it I am totally confused !!! Adding to it i have also written the wrong code still i achieved the desired result ?? How it can be possible . I am writing the codes below , please help me as i am working under a deadline from the client.
onChange event :
var newVal = this.boundItem(xfa.event.newText);
if(newVal == 0)
    xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.Purchasecost3_1" ).validate.nullTest = "disabled";
  else
     xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.Purchasecost3_1" ).validate.nullTest = "error";
For the onClick event :
var a = xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row2.CostItemRecovere d_OnlyEnergyCharges").rawValue;
//app.alert(a);
if(a == 0)
    xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L1_1").validate.nullTest = "error";
  if(a == 1)
      xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L1_1").validate.nullTest = "disabled";
   Please help someone !!!

I used the onchange event and wrote the code for it. I got the result . But there is a problem.All these fields are in a table and it's a dynamic table where you can add rows dynamically at the run time .I have other change event for some fields in this table .All are working fine when i add the row.But for this check box the required fields are not validated as required at the run time . I am here giving the code , Please help me .
form1.Subform0.Subform1.Subform9.Subform10.Table48.Row2.CostItemRecovered_OnlyEnergyCharge s::change - (JavaScript, client)
if(this.rawValue == "1")
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L1_1").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L2_1").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row5.ComplianceCheck_ L1_2").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row5.ComplianceCheck_ L2_2").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row6.ComplianceCheck_ L1_3").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row6.ComplianceCheck_ L2_3").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row7.ComplianceCheck_ L1_4").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row7.ComplianceCheck_ L2_4").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row8.ComplianceCheck_ L1_5").mandatory= "error";
  xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row8.ComplianceCheck_ L2_5").mandatory= "error";
else
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L1_1").mandator = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row4.ComplianceCheck_ L2_1").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row5.ComplianceCheck_ L1_2").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row5.ComplianceCheck_ L2_2").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row6.ComplianceCheck_ L1_3").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row6.ComplianceCheck_ L2_3").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row7.ComplianceCheck_ L1_4").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row7.ComplianceCheck_ L2_4").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row8.ComplianceCheck_ L1_5").mandatory = "disabled";
xfa.resolveNode("form1.Subform0.Subform1.Subform9.Subform10.Table48.Row8.ComplianceCheck_ L2_5").mandatory = "disabled";

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