如何选择，选择的选项基于第一次选择后重新加载页面的选项

Question

我在registerblade.php中有两个选择选项：

如果有任何一次点击课程名称的选项B.E./B.TECH.或文凭。然后根据所选的课程名称选择选项，结果将显示在

分支机构名称但此处需要文本字段Name，并且在控制器中设置了验证。现在，若我并没有填写名称并从选项中选择DIPLOMA，那个么结果会显示在第二个选项字段中。我从结果中选择任何选项并提交表单。然后表单将在register.blade.php上重定向，因为需要名称。并选择隐藏选项。

我希望在提交表单后，如果重定向在同一页面上，则分支机构名称字段应显示所选选项，如果已选中。

registerblade.php

<form action="route('register')" method="post">
<div class="form-group col-md-6 col-sm-6">
<label for="name">Name* </label>
<input type="text" class="form-control input-sm required" id="alumni_name" name="alumni_name" placeholder="" value="{{ old('alumni_name') }}">
<span style="color: red;">{{ $errors->first('alumni_name',':message') }}</span>
</div>
<div class = "form-group col-md-6 col-sm-6"> 
<label for="years">Name of Course*</label> 
<select class="form-control input-sm required" id="courses_name" name="alumni_course"> 
<option value="">-- Select Any one --</option> 
@foreach($coursename as $coursenames) 
<option value="{{ $coursenames->id.','.$coursenames->coursename }}" {{ old('alumni_course') == $coursenames->id.','.$coursenames->coursename ? 'selected' : '' }} >{{ $coursenames->coursename }}</option> 
@endforeach 
</select>
<span style="color: red;">{{ $errors->first('alumni_course',':message') }}</span> 
</div>
<div class = "form-group col-md-6 col-sm-6" id="dvPassport" style="display:none"> 
<label for="years">Name of Branch*</label> 
<select class="form-control input-sm required" id="branch_name" name="alumni_branch">
@include('auth.branchfind') 
</select> 
</div>
<input type="submit" value="SAVE">
</form>

AJAX在同一页面上：

<script type="text/javascript">
$(document).ready(function(){
$("#courses_name").change(function(){
var courses_name1 = $("#courses_name").val();
var courses_name2 = courses_name1.split(",");
var id = courses_name2[0];
var courses_name2 = courses_name2[1];
if(courses_name2 == 'B.E./B.TECH.' || courses_name2 == 'DIPLOMA')
{
$("#dvPassport").show();
$.ajax({
type: "GET",
url: "{{url("findbranch")}}",
data: {'id': id},
}).done(function(data){
$("#branch_name").html(data);
//console.log(data);
});
}
else {
$("#dvPassport").hide();
}
});
});
</script>

branchfind.blade.php是：

<option value=''>Select Any One</option>
@if(isset($branchname)) 
@foreach($branchname as $branchnames) 
<option value="{{ $branchnames->id }}" {{ old('alumni_branch') == $branchnames->id ? 'selected' : '' }} >{{ $branchnames->branchname }}</option> 
@endforeach 
@endif

控制器中AJAX请求的功能是：

public function findbranch(Request $request)
{
$branchname = branchname::where('course_id', $request->id)->get();
return view('auth.branchfind')->with(compact('branchname'))->render();
}

Answer 1

使用

$validator = Validator::make($rules,$request->all());
if ($validator->fails()) {
return redirect()->back()->withInput()->withErrors($validator);
}