jquery not sending date in query string : i have this html code.

    <form class="" role="form">
										<div class="col-lg-2">
											<div class="form-group">
												<label for="streams">Select Stream</label>
												<select name="streams" id="streams" class="form-control">
													<option value="">-- Select --</option>
													<?php
														while($streamRow = mysql_fetch_array($streamResult)) {
															echo
																"<option value=".$streamRow[0].">".$streamRow[1]."</option>";
														}
													?>
												</select>
											</div>
										</div>
										<div class="col-lg-2">
											<div class="form-group">
												<label for="branches">Select Branch</label>
												<select name="branches" id="branches" class="form-control">
													<option value="">-- Select --</option>
												</select>
											</div>
										</div>
										<div class="col-lg-2">
											<div class="form-group">
												<label for="batches">Select Batch</label>
												<select name="batches" id="batches" class="form-control">
													<option value="">-- Select --</option>
												</select>
											</div>
										</div>
										<div class="col-lg-2">
											<div class="form-group divBefore">
												<label for="divisionBefore">Div</label>
												<select name="divisionBefore" id="divisionBefore" class="form-control">
													<option value="">Sel</option>
												</select>
											</div>

											<div class="form-group divAfter hide">
												<label for="division">Div</label>
												<select name="division" id="division" class="form-control">
													<option value="">Sel</option>
													<?php
														$divisionResult = mysql_query("SELECT * FROM division");
														while($divisionRow = mysql_fetch_array($divisionResult)) {
															echo
																"<option value=".$divisionRow[0].">".$divisionRow[1]."</option>";
														}
													?>
												</select>
											</div>
										</div>
										<div class="col-lg-2">
											<div class="form-group semesterBefore">
												<label for="semBefore">Sem</label>
												<select name="semBefore" id="semBefore" class="form-control">
													<option value="">Sel</option>
												</select>
											</div>

											<div class="form-group semesterAfter hide">
												<label for="sem">Sem</label>
												<select name="sem" id="sem" class="form-control">
													<option value="">Sel</option>
												</select>
											</div>
										</div>
										<div class="col-lg-2">
											<div class="form-group subject">
												<label for="subject">Select Subject</label>
												<select name="subject" id="subject" class="form-control">
													<option value="">-- Select --</option>
												</select>
											</div>
										</div>
										<!--<div class="col-lg-2" id="lecBefore">
											<div class="form-group">
												<label for="subject">Select Lecture</label>
												<select name="lect" id="lect" class="form-control">
													<option value="">-- Select --</option>
												</select>
											</div>
										</div>
										<div class="col-lg-2 hide" id="lecAfter">
											<div class="form-group">
												<label for="subject">Select Lecture</label>
												<select name="lecture" id="lecture" class="form-control">
													<option value="">-- Select --</option>
													<option value="1">Lecture 1</option>
													<option value="2">Lecture 2</option>
													<option value="3">Lecture 3</option>
													<option value="4">Lecture 4</option>
													<option value="5">Lecture 5</option>
													<option value="6">Lecture 6</option>
													<option value="7">Lecture 7</option>
													<option value="8">Lecture 8</option>
												</select>
											</div>
										</div>-->
										<div class="col-lg-2 hide" id="date">
											<div class="form-group">
												<label for="dateNow">Start Date</label> <br>
												<div class="input-group date" id="avsDate">
													<input type="text" class="form-control" name="avsDateTxt" id="avsDateTxt" readonly value="<?php echo date('d-m-Y');?>"><span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
												</div>
											</div>
										</div>
										<div class="col-lg-2 hide" id="date1">
											<div class="form-group">
												<label for="dateNow">End Date</label> <br>
												<div class="input-group date" id="endDate">
													<input type="text" class="form-control" name="endDateTxt" id="endDateTxt" readonly value="<?php echo date('d-m-Y');?>"><span class="input-group-addon"><i class="glyphicon glyphicon-th"></i></span>
												</div>
											</div>
										</div>
									</form>

and my jquery is.

    $(document).ready(function() {
						$('.sidebar-menu .attnd').addClass('active');
						$('.sidebar-menu .attnd .genExcel').addClass('active');
						$(".sidebar-menu .attnd").tree();
						$('#streams').change(function() {
							$('#branches').html("<option value=''>-- Select --</option>");
							$('#batches').html("<option value=''>-- Select --</option>");
							$('.divAfter').hide();
							$('.divBefore').show();
							$('.semesterAfter').hide();
							$('.semesterBefore').show();
							$('#date').hide();
							$('#date1').hide();
							$('#lecAfter').hide();
							$('#lecBefore').show();
							$('#studManip').html('');
							if($(this).val() != '')
								$.streamSelection($(this).val());
						});
						$('#branches').change(function() {
							$('#batches').html("<option value=''>-- Select --</option>");
							$('.divAfter').hide();
							$('.divBefore').show();
							$('.semesterAfter').hide();
							$('.semesterBefore').show();
							$('#date').hide();
							$('#date1').hide();
							$('#lecAfter').hide();
							$('#lecBefore').show();
							$('#studManip').html('');
							if($(this).val() != '')
								$.branchSelection($(this).val());
						});
						$('#batches').change(function() {
							$('.divAfter').hide();
							$('.divBefore').show();
							$('.semesterAfter').hide();
							$('.semesterBefore').show();
							$('#date').hide();
							$('#date1').hide();
							$('#lecAfter').hide();
							$('#lecBefore').show();
							$('#studManip').html('');
							if($(this).val() != '') {
								$.listSemester($(this).val());
								$('.divBefore').hide();
								$('#division').val('');
								$('.divAfter').show();
							}
						});
						$('#division').change(function() {
							$('.studList').hide();
							$('.semesterAfter').hide();
							$('.semesterBefore').show();
							$('#date').hide();
							$('#date1').hide();
							$('#lecAfter').hide();
							$('#lecBefore').show();
							$('#studManip').html('');
							if($(this).val() != '') {
								$('.semesterBefore').hide();
								$('#sem').val('');
								$('.semesterAfter').show();
							}
						});
						$('#sem').change(function() {
							$('#date').hide();
							$('#date1').hide();
							$('#lecAfter').hide();
							$('#lecBefore').show();
							$('#studManip').html('');
							if($(this).val() != '')
								$.searchSubject();
						});
						$('#subject').change(function() {
							if($(this).val() != '') {
								$.when($('#date').show())
								.then($('#date1').show())
								.then($('.btnExcel').show());
							}
						});
						/*$('#lecture').change(function() {
							$.when($('#date').hide())
							.then($('#studManip').html(''));
							if($(this).val() != '') {
								$('#date').show();
								$.when($.searchStudent())
								.then($('#studManip').show());
							}
						});*/
						$('#avsDate').datepicker({
							format: "dd-mm-yyyy",
							startDate: "01-01-2012",
							endDate: '<?php echo date('d-m-Y')?>',
							todayBtn: "linked",
							autoclose: true,
							todayHighlight: true,
						});
						$('#endDate').datepicker({
							format: "dd-mm-yyyy",
							startDate: "01-01-2012",
							endDate: '<?php echo date('d-m-Y')?>',
							todayBtn: "linked",
							autoclose: true,
							todayHighlight: true,
						});
						$('#avsDate').datepicker().on('changeDate', function(e) {
								$.when($('.btnExcel').attr('href', 'studExcel.php?streamId='+$('#streams').val()+'&branchId='+$('#branches').val()+'&batchId='+$('#batches').val()+'&divisionId='+$('#division').val()+'&semId='+$('#sem').val()+'&sDate='+$('#advDatetxt').val()+'&eDate='+$('#endDatetxt').val()))
								.then($('.btnExcel').show());
						});
						$('#endDate').change(function() {
								$.when($('.btnExcel').attr('href', 'studExcel.php?streamId='+$('#streams').val()+'&branchId='+$('#branches').val()+'&batchId='+$('#batches').val()+'&divisionId='+$('#division').val()+'&semId='+$('#sem').val()+'&sDate='+$('#advDatetxt').val()+'&eDate='+$('#endDatetxt').val()))
								.then($('.btnExcel').show());
						});
						/*var date = new Date();
						$('#avsDate').datepicker().on('changeDate', function(e) {
							$('#studManip').html('');
							if(weekday[$(this).datepicker('getDate').getUTCDay()] != 'Sunday'){
								$.when($.searchStudent())
								.then($('#studManip').show());
							} else
								alert('Today is Sunday');
						});*/
					});
					$.streamSelection = function(selStreamId) {
						$.ajax({
							url:"../student/searchBranch.php",
							data:{
								streamId:selStreamId,
							},
							success: function(data) {
								$('#branches').html(data);
							},
							error: function(error) {
								alert(error);
							}
						});
					}
					$.branchSelection = function(selBranchId) {
						$.ajax({
							url:"../student/searchBatch.php",
							data:{
								branchId:selBranchId,
							},
							success: function(data) {
								$('#batches').html(data);
							},
							error: function(error) {
								alert(error);
							}
						});
					}
					$.listSemester = function(selStreamId) {
						$.ajax({
							url:"../student/searchStream.php",
							data:{
								streamId:selStreamId,
							},
							success: function(data) {
								$('#sem').html(data);
							},
							error: function(error) {
								alert(error);
							}
						});
					}
					$.searchSubject = function() {
						$.ajax({
							url:"searchSubject.php",
							data:{
								streamId 	: 	$('#streams').val(),
								branchId	: 	$('#branches').val(),
								semId		: 	$('#sem').val(),
							},
							success: function(data) {
								$('#subject').html(data);
							},
							error: function(error) {
								alert(error);
							}
						});
					}

every thing  is working fine but when i change **advDatetxt** or **endDatetxt** jquery won't sending value with query string and describe as indefined. when i put cursor on excel button it will display left bottom corner as.

[![undefine variable][1]][1]


  [1]: http://i.stack.imgur.com/f0uwB.png