[英]How can I redirect my form with the sum of two values and show it in a readonly input field in Laravel?
I am making a simple form two sum two values. 我正在做一个简单的形式,两个值相加两个值。 I want to display the calculated result in an readonly input after the request went through. 请求通过后,我想在只读输入中显示计算结果。 If I dd() the sum of my two fields, the sum is correct. 如果我dd()两个字段的和,则该和是正确的。 But I am unable to pass the sum back to the view. 但是我无法将总和传递回视图。
I searched around the web and found nothing promising. 我在网上搜索,发现没有什么希望。 Same with the Laravel documentation. 与Laravel文档相同。
Form: 形成:
<p>
<input type="number" name="numberOne" value="{{ old('numberOne') }}">
</p>
<p>
<input type="number" name="numberTwo" value="{{ old('numberTwo')}}">
</p>
<p>
<input type="number" name="calculated" value="{{ isset($calculated) ? $calculated : '' }}" readonly>
</p>
Controller: 控制器:
class CalculationsController extends Controller
{
public function process(Request $request) {
$numberOne = $request->input('numberOne');
$numberTwo = $request->input('numberTwo');
$calculated = $numberOne + $numberTwo;
dd($calculated);
return redirect('/')->withInput();
}
}
Expected would be the sum of both inputs in the readonly. 预期将是只读中两个输入的总和。 But after the submit, it's still empty. 但是提交后,它仍然是空的。 What am I doing wrong? 我究竟做错了什么?
$request->merge(['calculated' => $caluclated]);
return redirect('/')->withInput($request->all());
<input type="number" name="calculated" value="{{ old('calculated') }}" readonly>
When you use the redirect()
function the variable $calculated
isn't passed to the view. 当您使用redirect()
函数时,变量$calculated
不会传递给视图。 I think the best solution is passing it by Session. 我认为最好的解决方案是通过Session。 Your redirect must be something like that: 您的重定向必须是这样的:
return redirect('/')->withInput()->with('calculated', $calculated);
The with()
function is used to pass data through the session. with()
函数用于通过会话传递数据。 To retrieve it in your view, do: 要在您的视图中检索它,请执行以下操作:
<input type="number" name="calculated" value="{{ session()->has('calculated') ? session('calculated') : '' }}" readonly>
For documentation, check: https://laravel.com/docs/5.7/redirects#redirecting-with-flashed-session-data https://laravel.com/docs/5.7/session#retrieving-data 有关文档,请检查: https : //laravel.com/docs/5.7/redirects#redirecting-with-flashed-session-data https://laravel.com/docs/5.7/session#retrieving-data
Add calculated value before redirect, 在重定向前添加计算值,
class CalculationsController extends Controller
{
public function process(Request $request) {
$numberOne = $request->input('numberOne');
$numberTwo = $request->input('numberTwo');
$calculated = $numberOne + $numberTwo;
$request->merge(['calculated' => $calculated ]);
// dd($calculated);
return redirect('/')->withInput();
}
}
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