Forum:

communication out.println and request parameter

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posted 12 years ago

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what i am doing is i am making a dynamic page on fly using

out.println("<html>" +
                            "<body>" +
                            "<form name=\"frmConfigParameters\" METHOD=\"POST\">" +
                                    "<input type=\"text\" name=\"txtParamName\" maxlength=\"30\" value=\""+ParameterName+"\" class=\"mandatoryField\">" +
                                    "<input type=\"text\" name=\"hdnParamName\" maxlength=\"30\" value=\""+hdnParameterName+"\" class=\"mandatoryField\">" +
                                    "<input type=\"text\" name=\"txtHidMode\" id=\"txtHidMode\" value=\""+ActionMode+"\">" +
                                    "" +
                                    "<input type=\"text\" name=\"txtparamValue\" id=\"txtparamValue\" value=\""+ParameterValue+"\" />" +
                                    "<input type=\"text\" name=\"txtdesc\" maxlength=\"100\" value=\""+Description+"\" class=\"mandatoryField\">" +
                                    "<input type=\"text\" name=\"hdndesc\" maxlength=\"100\" value=\""+hdnDesc+"\" />" +
                                    "<input type=\"text\" name=\"hdnDataType\" maxlength=\"100\" value=\""+hdnDataType+"\" />" +
                                    "<input type=\"text\" name=\"txtStatus\" id=\"txtStatus\" value=\""+Status+"\" />" +
                                    "<input type=\"text\" name=\"hdnMin\" id=\"hdnMin\" value=\""+MinValue+"\" />" +
                                    "<input type=\"text\" name=\"hdnMax\" id=\"hdnMax\" value=\""+MaxValue+"\" />" +
                                    "<input type=\"text\" name=\"txtDataLegnth\" id=\"txtDataLegnth\" value=\""+DataLegnth+"\">" +
                                    "<select name=\"txtdatatype\" id =\"txtdatatype\" class=\"mandatoryField\" onchange=\"change('Body')\">" +
                                            "<option value=\""+DataType+"\" >Check</option>" +
                                    "</select>" +
                                    "<input type=\"text\" name=\"txtPV\" id =\"txtPV\" maxlength=\"100\" value=\""+ParameterValue+"\" class=\"mandatoryField\" onkeyup=\"checkIntegerNumber(frmConfigParam.txtPV);\" onkeypress=\"checkIntegerNumber(frmConfigParam.txtPV);\" >" +
                                    "<input type=\"text\" name=\"ParamID\" id=\"ParamID\" value=\""+ParameterID+"\" />" +
                            "</form>" +
                            "</body>" +
                            "</html>");

In jsp file i have huge code in which same parameters are present,
above i made on servlet to save the state of textboxes.

sometime servlet returns NULL, but variable do have value

like ParameterID = 5 in servlet

but when called using REQUEST.GETPARAMETER("ParamID"); on jsp then it takes null.

WHY???

Regards
Azrael Noor

Devaka Cooray

Sheriff