我有分支索引页面它包含2个下拉菜单，称为公司和经销商，当我点击公司它包含我创建的公司时，点击公司相应的经销商应列在经销商下拉列表中。我直接使用eloqent进入索引页面，因为我无法访问索引页面中的公司和经销商
Index
@include('theme.header')
<?php use Illuminate\Support\Facades\DB;?>
<div class="page-content-wrapper ">
<div class="container-fluid">
<div class="row">
<div class="col-sm-12">
<div class="page-title-box">
<div class="btn-group float-right">
</div>
<h4 class="page-title">Branch Management</h4>
</div>
</div>
</div>
<!-- end page title end breadcrumb -->
<div class="row">
<div class="col-12">
<div class="card m-b-30">
<div class="card-body">
<h4 class="mt-0 header-title">Branch</h4>
<br>
<br>
<form id="form" method="post" action="{{route('branch.store')}}">
{{csrf_field()}}
<div class="form-group row">
<label class="col-sm-2 col-form-label">Company</label>
<div class="col-sm-10">
<select class="form-control" id="company" name="company">
<option>Select Company</option>
@foreach(\App\Company::all()->where('status','0') as $company)
<option value="{{$company->comp_id}}">{{$company->name}}</option>
@endforeach
</select>
</div>
</div>
<div class="form-group row">
<label class="col-sm-2 col-form-label">Dealership</label>
<div class="col-sm-10">
<select class="form-control" id="dealer" name=" dealer">
<option>Select Dealership</option>
@foreach(\App\Dealership::join('companies','comp_id','=','dealerships.comp_id')->where('status','0') as $dealership)
<option value="{{$dealership->dlr_id}}">{{$dealership->name}}</option>
@endforeach
</select>
</div>
</div>
<div class="form-group row">
<label for="example-text-input" class="col-sm-2 col-form-label">Email</label>
<div class="col-sm-10">
<input class="form-control" type="email" id="email" name="email" required>
</div>
</div>
<div class="form-group row">
<label for="example-text-input" class="col-sm-2 col-form-label">Branch Name</label>
<div class="col-sm-10">
<input class="form-control" type="text" id="branch" name="branch" required>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="page-title-box">
<div class="btn-group float-right">
<button class="btn btn-primary" id="btn_save" data-toggle="modal"
data-target="#create" type="submit">Save
</button>
</div>
</div>
</div>
</div>
</form>
</div>
</div>
@include('theme.footer')
答案 0 :(得分：1)
首先是第一件事。您需要更改查询。
Company::where(‘status’, 0)->get();
接下来你错过了下一个下拉列表中的尾随get（）。 你为什么不使用关系来查询？
答案 1 :(得分：0)
就像Muhammad Naumann已经说过你必须使用get()方法来获取实际数据：
Company::where(‘status’, 0)->get();
在公司选择字段中，您可以添加onChange之类的事件监听器。在此监听器中，您运行ajax get请求以获取所选公司的经销商。
答案 2 :(得分：0)
我用Ajax想出来了。
在控制器文件中创建自定义功能。在这种情况下，分支控制器，此函数包含用于检索数据的查询构建器
写入Ajax，在索引文件中，经销商下拉列表默认为隐藏，当您选择公司时，下拉列表将显示相应的数据。
@include('theme.header')
<?php use Illuminate\Support\Facades\DB;?>
<script language="javascript">
/*--- Fliter dealership corressponging company---*/
$(document).ready(function () {
$('#dealership_div').hide();
$('#company').change(function () {
alert('hello');
$('#dealership_div').show();
let id = this.value;
$.ajax({
url: '/filter_dealer',
type: "post",
data: {option: id},
success: function (data) {
$('#dealer')
.find('option')
.remove()
.end()
.append(" <option value=''>--- Select dealership ---</option>")
$.each(data, function (key, value) {
$('#dealer')
.append($("<option></option>")
.attr('value', value['dlr_id'])
.text(value['name'])
);
});
},
error: function () {
alert("Error occurred While Processing");
}
});
});
});
</script>
<div class="page-content-wrapper ">
<div class="container-fluid">
<div class="row">
<div class="col-sm-12">
<div class="page-title-box">
<div class="btn-group float-right">
</div>
<h4 class="page-title">Branch Management</h4>
</div>
</div>
</div>
<!-- end page title end breadcrumb -->
<div class="row">
<div class="col-12">
<div class="card m-b-30">
<div class="card-body">
<h4 class="mt-0 header-title">Branch</h4>
<br>
<br>
<form id="form" method="post" action="{{route('branch.store')}}">
{{csrf_field()}}
<div class="form-group row">
<label class="col-sm-2 col-form-label">Company</label>
<div class="col-sm-10">
<select class="form-control" id="company" name="company">
<option>Select Company</option>
@foreach(\App\Company::all()->where('status','0') as $company)
<option value="{{$company->comp_id}}">{{$company->name}}</option>
@endforeach
</select>
</div>
</div>
<div class="form-group row" id="dealership_div">
<label class="col-sm-2 col-form-label">Dealership</label>
<div class="col-sm-10">
<select class="form-control" id="dealer" name=" dealer">
<option></option>
</select>
</div>
</div>
<div class="form-group row">
<label for="example-text-input" class="col-sm-2 col-form-label">Email</label>
<div class="col-sm-10">
<input class="form-control" type="email" id="email" name="email" required>
</div>
</div>
<div class="form-group row">
<label for="example-text-input" class="col-sm-2 col-form-label">Branch Name</label>
<div class="col-sm-10">
<input class="form-control" type="text" id="branch" name="branch" required>
</div>
</div>
<div class="row">
<div class="col-sm-12">
<div class="page-title-box">
<div class="btn-group float-right">
<button class="btn btn-primary" id="btn_save" data-toggle="modal"
data-target="#create" type="submit">Save
</button>
</div>
</div>
</div>
</div>
</form>
</div>
</div>
public function filter_dealer(Request $request)
{
$company_id=$request->input('option');
$dealership=DB::table('dealerships')->select('dlr_id','name')->where([['comp_id','=',$company_id],['status','=','0']])->get();
return response()->json($dealership);
}
Route::post('filter_dealer', 'BranchController@filter_dealer')->name('filter_dealer');
答案 3 :(得分：-1)
如果要动态更改经销商下拉列表的内容，如果更改公司下拉列表，则应使用javascript，jquery或类似的javascript框架，因为PHP是服务器端脚本语言，需要页面刷新才能更改网页的内容。