如何从名称输入数组 laravel 中获取旧输入值

Question

I have this code

@foreach($questions as $question_name => $question_details)
                            <h5>{{ $question_name }}</h5>
                            @foreach($question_details as $question_id => $question_description)
                                <p class="ms-3">{{ $question_description }}</p> 
                                <input type="hidden" name="question_id[]" value="{{ $question_id }}"/>
                                <textarea name="answers[]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here.."></textarea>
                            @endforeach
                        @endforeach

And when I submit a form with some empty values, the answers that I got also get deleted if some error occurs I tried this to get back my old inputs but it didn't bring me anything

I tried

<textarea name="answers[]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here..">{{ old('answers') }}</textarea>

<textarea name="answers[]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here..">{{ old('answers[]') }}</textarea>

<textarea name="answers[]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here..">{{ old('answers.0') }}</textarea>

But nothing really succeed to bring me back the old values that I typed can someone help me with that?

Answer 1

When you submit a form that has a HTML array ( name="answers[]" ), it will be converted to a proper PHP array in the backend. This also means that the values will be indexed like a PHP array is always indexed. If you have three rows, even without values, you can expect it to look like so:

dd($request->input('answers');
/* Output: [
    0 => null,
    1 => null,
    2 => null,
]; */

When you then fetch old('answers') , you will get an array . If you want the second answer, you will have to fetch old('answers.1') .

If you want the structure to be more clear and dynamic, you could use your question ID as index parameter:

@foreach($question_details as $question_id => $question_description)
    <p class="ms-3">{{ $question_description }}</p> 
    <textarea name="answers[{{$question_id}}]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here...">{{old("answers.{$question_id}")}}</textarea>
@endforeach

Now your array will be keyed by your question IDs. If, however, you don't want to do that, you can also key by loop index:

@foreach($question_details as $question_id => $question_description)
    <p class="ms-3">{{ $question_description }}</p> 
    <input type="hidden" name="question_id[{{$loop->index}}]" value="{{ $question_id }}"/>
    <textarea name="answers[{{$loop->index}}]" class="form-control ms-3" cols="30" rows="2" placeholder="Your answer here...">{{old("answers.{$loop->index}")}}</textarea>
@endforeach

You can read more about the $loop variable here

Answer 2

<textarea name="answers[]" 
    class="form-control ms-3" cols="30" rows="2" 
    placeholder="Your answer here.."
    >{{ old('answers.' . $loop->index) }}</textarea>