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Laravel form内 old関数使用例

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inputタグ
name属性の値を、old()の引数に入れる。

 <input type="title" name="title" value="{{ old('title') }}" class="form-control" id="input_title" placeholder="old関数の引数にname属性で指定した値を入れてる。">

textareaタグ

ここにold()入れる。 oldの引数にはname属性の値を入れる。
 <textarea type="text" name="body" class="form-control" id="input_body">{{ old('body') }}</textarea>

selectタグ
selectのname属性の値をold()の引数に指定
if分でidの値が「1」なら@if(old('id')=='1') selected @endif がselectedされる感じ。

<select name="id">
    <option value="1" selected @if(old('id')=='1') selected  @endif>1</option>
    <option value="2" @if(old('id')=='2') selected  @endif>2</option>
    <option value="3" @if(old('id')=='3') selected  @endif>3</option>
</select>
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