选择框验证（在 Laravel 中）
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Select box validation (in laravel)
提问by Kanav
I have a form containing text inputs and select box. I was trying to apply laravel validation. Now i wanted to retain the user inputted values, if validation doesn't success.
我有一个包含文本输入和选择框的表单。我试图应用 Laravel 验证。现在我想保留用户输入的值，如果验证不成功。
I am able to get this done on input box, but not on select box. How to show previously selected value(in select box) if validation doesn't pass.
我可以在输入框上完成这项工作，但不能在选择框上完成。如果验证未通过，如何显示先前选择的值（在选择框中）。
This is my code
这是我的代码
{{Form::select('vehicles_year', $modelYears, '-1', ['id' => 'vehicles_year'])}}
<span class="help-block" id="vehicles_year_error">
@if ($errors->has('vehicles_year')) {{$errors->first('vehicles_year')}} @endif
</span>
-1 is the key of default value that i am showing when the form loads.
-1 是我在表单加载时显示的默认值的键。
回答by Andreyco
What I do is that I add "default" option which value is set to "nothing".
In validation rules I say this value is required. If user does not pick
one of the other options, validation fails.
我所做的是添加“默认”选项，该选项的值设置为“无”。
在验证规则中，我说这个值是必需的。如果用户未选择其他选项之一，则验证失败。
$options = [
'value' => 'label',
'value' => 'label',
'value' => 'label',
'value' => 'label',
];
$options = array_merge(['' => 'please select'], $options);
{{ Form::select('vehicles_year', $options, Input::old('vehicles_year'), ['id' => 'vehicles_year']) }}
@if ($errors->has('vehicles_year'))
<span class="help-block" id="vehicles_year_error">
{{ $errors->first('vehicles_year') }}
</span>
@endif
// Validation rules somewhere...
$rules = [
...
'vehicles_year' => 'required|...',
...
];
回答by JulienTant
The controller code is missing. I will suppose your handle the POSTin a controller method and then you Redirect::back()->withInput();
控制器代码丢失。我会假设你POST在控制器方法中处理，然后你Redirect::back()->withInput();
Thanks to ->withInput()You can use in your view something like Input::old()to get the Input values of your previous request.
感谢->withInput()您可以在您的视图中使用类似的东西Input::old()来获取您之前请求的输入值。
So to select your previous item ANDhave -1 by default, you can use Input::old('vehicles_year', -1)
因此AND，默认情况下要选择上一个项目具有 -1，您可以使用Input::old('vehicles_year', -1)
The first argument is the Input name, and the second is the default value.
第一个参数是输入名称，第二个参数是默认值。
{{Form::select('vehicles_year', $modelYears, Input::old('vehicles_year', -1), ['id' => 'vehicles_year'])}}
Hope this helps
希望这可以帮助
