Question

如何显示复选框，其中选择选项= category_id。

选择一个选项后，我试图显示复选框。

我想要同一件事。但是有了Laravel和数据库。

但是为什么选择一个我会得到浏览器白页？

firefox中的检查器

index.blade.php

<form action="{{ route('computers.store') }}" method="post">
    {{ csrf_field() }}
    <div class="form-group">
        <select id="select" name="category_id" class="form-control" onchange="displayBoxes()">
            @foreach($categories as $category)
                <option data-description="{{ $category->description }}" value="{{ $category->id }}">{{ $category->name }}</option>
            @endforeach
        </select>
    </div>
    <div class="form-group">
        <p id="description"></p>
    </div>
    <div class="form-group d-none box17">
        <p></p>
        @foreach ($computers->where('category_id', 2) as $computer)
            <input type="checkbox" id="{{ $computer->latin }}">
            <label for="{{ $computer->latin }}">{{ $computer->name }}</label>
        @endforeach
    </div>
    <div class="form-group d-none box18">
        <p></p>
        @foreach ($computers->where('category_id', 3) as $computer)
            <input type="checkbox" id="{{ $computer->latin }}">
            <label for="{{ $computer->latin }}">{{ $computer->name }}</label>
        @endforeach
    </div>
    <div class="form-group d-none box19">
        <p></p>
        @foreach ($computers->where('category_id', 4) as $computer)
            <input type="checkbox" id="{{ $computer->latin }}">
            <label for="{{ $computer->latin }}">{{ $computer->name }}</label>
        @endforeach
    </div>
    <div class="form-group">
        <button class="btn btn-primary">ادامه</button>
    </div>
</form>

script.js

const selectElement = document.querySelector('#select');
selectElement.addEventListener('change', (event) => {
    let boxes = document.querySelectorAll('div');
    boxes.forEach(function(e) {
        e.classList.add('d-none');
    });
});
document.querySelector('.box' + selectElement.options[selectElement.selectedIndex].value).classList.remove('.d-none');

我在控制台中收到此错误

SyntaxError：重新声明const selectElement

选择选项时如何显示复选框？

0 个答案: