Laravel 7 - 如何正确显示旧输入/s？
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【中文标题】Laravel 7 - 如何正确显示旧输入/s？【英文标题】：Laravel 7 - How to display properly the old input/s? 【发布时间】：2021-01-02 06:59:54 【问题描述】：在将表单输入/值提交给控制器验证之前，当验证失败时，我试图显示旧的/以前的输入，但它只重定向回页面，表单中的所有输入字段为空或不显示以前的输入。
这是我在store函数中的控制器代码(SaleController)：
public function store(Request $request)
$validator = Validator::make($request->all(), [
'invoice_no' => 'required|unique:sales_h|max:255',
]);
if($validator->fails())
//dd($validator);
Toastr::warning('Invoice No. cannot be repeated or blank.', 'Warning');
return redirect()->back()->withInput($request->all);
/* ...... */
这是我的视图刀片文件 (create.blade.php) 的 sn-p 源代码：
<form class="form-horizontal" method = "POST" action = " route('sales.store') ">
@csrf
<div class="card-body">
@if ($errors->any())
<div class="alert alert-danger">
<ul class="mb-0">
@foreach ($errors->all() as $error)
<li> $error </li>
@endforeach
</ul>
</div>
@endif
<div class="form-group row">
<div class="col-md-12">
<div class="alert alert-info alert-dismissible">
<button type="button" class="close" data-dismiss="alert" aria-hidden="true">×</button>
<h5><i class="icon fas fa-info" d></i> Info!</h5>
A sales order is a document generated by the seller upon receiving a
purchase order from a <strong>buyer/customer</strong> specifying the details about the product or service
along with price, quantity, buyer details.
</div>
<strong><font color="red">*</font> Indicates required fields.</strong>
</div>
<div class="col-md-4">
<label for="date" class="col-sm-6 col-form-label">Date <font color="red">*</font></label>
<div class="input-group mb-2 $errors->has('date') ? 'has-error' : ''" >
<div class="input-group-prepend">
<span class="input-group-text"><i class="far fa-calendar-alt"></i></span>
</div>
<input type="text"
class="form-control"
id="date"
name = "date"
autocomplete="off"
value=" old('date') "
required>
</div>
</div>
<div class="col-md-4">
<label for="invoice_no" class="col-sm-6 col-form-label">Invoice No. <font color="red">*</font></label>
<div class="input-group mb-2">
<div class="input-group-prepend $errors->has('invoice_no') ? 'has-error' : ''">
<span class="input-group-text"><i class="fas fa-hashtag"></i></span>
</div>
<input type="text"
class="form-control"
id="invoice_no"
name = "invoice_no"
maxlength = "15"
value=" old('invoice_no') "
onkeyup="this.value=this.value.replace(/[^\d]/,'')"
required>
</div>
</div>
<div class="col-md-4">
<label for="shop_name" class="col-sm-6 col-form-label">Customer Name <font color="red">*</font></label>
<div class="input-group mb-2">
<div class="input-group-prepend $errors->has('shop_name') ? 'has-error' : ''">
<span class="input-group-text"><i class="fas fa-hashtag"></i></span>
</div>
<input type = "text"
class="form-control"
id="shop_name"
name = "shop_name"
placeholder = "Customer Name"
autocomplete = "on"
value=" old('shop_name') "
required>
</div>
</div>
</div>
</div>
<div class = "form-group row">
<div class="col-md-12">
<label for = "info" class = "col-md-4 col-form-label"><strong><i class="fas fa-info-circle"></i></strong> Sales Order Information</label>
<div class = "col-sm-12 $errors->has('product_information') ? 'has-error' : ''">
<textarea name = "product_information"
class = "form-control"
rows = "4"
value=" old('product_information') "
></textarea>
</div>
</div>
</div>
<div class = "col-md-12 field-wrapper">
<div class = "form-group row">
<div class="col-md-12">
<label for="id_raw_product" class="col-sm-4 col-form-label">Product Name <font color="red">*</font></label>
</div>
<div class="col-sm-3">
<input type="hidden" readonly = "true" class="form-control" id="id_raw_product_1" name = "id_raw_product[]" placeholder = "Product Name" required>
<input type="text"
readonly = "true"
class="form-control"
id="name_raw_product_1"
name = "name_raw_product[]"
value=" old('id_raw_product_1') "
placeholder = "Product Name">
</div>
<div class="col-sm-2">
<a href = "/transaction/sales/product/popup_media/1"
class = "btn btn-info"
title = "Product"
data-toggle = "modal"
data-target = "#modal-default">Product</a>
</div>
<div class="col-sm-3">
<input type="number"
class="form-control"
id="price_1"
name = "price[]"
value=" old('price_1') "
placeholder = "Price"
onkeyup="this.value=this.value.replace(/[^\d]/,'')" required>
</div>
<div class="col-sm-2">
<input type="number"
class="form-control"
id="total_1"
name = "total[]"
value=" old('total_1') "
placeholder = "Quantity"
onkeyup="this.value=this.value.replace(/[^\d]/,'')" required>
</div>
<div class = "col-sm-2">
<a href = "javascript:void(0)" class = "btn btn-primary add_Button" title = "Add Row"><i class = "fas fa-plus"></i></a>
</div>
</div>
</div>
</div>
<!-- /.card-body -->
<div class="card-footer">
<button type="submit" class="btn btn-default float-right" name = "submit_create" id = "submit_create">Submit</button>
</div>
<!-- /.card-footer -->
</form>
【问题讨论】：
你不能把Toastr::warning() 放在return 语句之后...代码永远不会到达那里。如果你把它放在之前返回，你可能会有更多的运气。
@TimLewis 尝试将它放在 return 语句之前，但仍然没有运气。无论如何，感谢您注意到它将无法访问:)
【参考方案1】：
像这样编写你的控制器代码 -
public function store(Request $request)
$validator = Validator::make($request->all(), [
'invoice_no' => 'required|unique:sales_h|max:255',
]);
if($validator->fails())
return redirect()->back()->withInput()->withErrors($validator->messages()->all());
并在刀片文件中添加此代码 -
@if ($errors->any())
<div class="alert alert-danger">
<ul class="mb-0">
@foreach ($errors->all(':message') as $input_error)
<li> $input_error </li>
@endforeach
</ul>
</div>
@endif
【讨论】：
控制器端的代码运行良好。尝试打印 $validator 的内容，它会打印验证失败的输入名称及其相应的错误消息，但它不会在刀片文件中发送并且不显示错误。 您是否添加了我在解决方案中添加的刀片文件代码？请尝试此解决方案，如果它不起作用，请告诉我。我将研究另一种解决方案。谢谢。 要在 laravel 中打印验证错误，需要检索错误消息包，所以我稍微更改了您的控制器代码并尝试在刀片文件中打印它。请试试这个并告诉我。 是的，我还添加了您为刀片文件提供的代码。我将它添加到 编辑了我的帖子。只需要显示旧输入，因为我已经有一个 Toastr 用于验证失败时的错误消息。以上是关于Laravel 7 - 如何正确显示旧输入/s？的主要内容，如果未能解决你的问题，请参考以下文章