如何使用两个值的总和重定向我的表单并将其显示在Laravel的只读输入字段中？

问题描述：

I am making a simple form two sum two values. I want to display the calculated result in an readonly input after the request went through. If I dd() the sum of my two fields, the sum is correct. But I am unable to pass the sum back to the view.

I searched around the web and found nothing promising. Same with the Laravel documentation.

Form:

<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:

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. But after the submit, it's still empty. What am I doing wrong?

我正在制作一个两个和两个值的简单形式。我想在请求通过后在readonly输入中显示计算结果。如果我dd（）我的两个字段的总和，总和是正确的。但我无法将这笔款项转回视图。 p>

我在网上搜索，没有发现任何有希望的事情。与Laravel文档相同。 p>

表单： p>

 ＆lt; p＆gt; 
＆lt; input type =“number”name =“numberOne  “value =”{{old（'numberOne'）}}“＆gt; 
＆lt; / p＆gt; 
＆lt; p＆gt; 
＆lt; input type =”number“name =”numberTwo“value =”{{old（'  numberTwo'）}}“＆gt; 
＆lt; / p＆gt; 
＆lt; p＆gt; 
＆lt; input type =”number“name =”calculated“value =”{{isset（$ calculated）？$ calculated：''}  }“readonly＆gt; 
＆lt; / p＆gt; 
  code>  pre> 
 
 控制器： p> 
 
 
 类CalculationsController extends Controller 
 {  
公共功能流程（请求$请求）{
 $ numberOne = $ request-＆gt; input（'numberOne'）; 
 $ numberTwo = $ request-＆gt; input（'numberTwo'）; 
 
 $  calculated = $ numberOne + $ numberTwo; 
 
 dd（$ calculated）; 
 
返回redirect（'/'） - ＆gt; withInput（）; 
} 
} 
  code>   pre> 
 
 预期将是readonly中两个输入的总和。 但提交后，它仍然是空的。 我做错了什么？ p> 
  div>

答

When you use the redirect() function the variable $calculated isn't passed to the view. I think the best solution is passing it by Session. Your redirect must be something like that:

return redirect('/')->withInput()->with('calculated', $calculated);

The with() function is used to pass data through the session. To retrieve it in your view, do:

<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

答

$request->merge(['calculated' => $caluclated]);

return redirect('/')->withInput($request->all());

<input type="number" name="calculated" value="{{ old('calculated') }}" readonly>

答

Add calculated value before redirect,

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();
    }
}

如何使用两个值的总和重定向我的表单并将其显示在Laravel的只读输入字段中？

相关推荐