基于 Laravel 中所选选项的表单操作中的动态路由路径

Question

我在 laravel 5.4 视图中有这样的表格：

<form action="#" method="POST" class="form-inline" role="form">
        {{ csrf_field() }}
            <div class="form-group">
                <select id="tdcategory" class="selectpicker show-tick show-menu-arrow" onchange="this.form.submit()">
                  @foreach($categories as $category)
                        <option value="{{ $category->id }}">{{ $category->name }}</option>
                  @endforeach
                </select>
            </div>
            <div class="form-group">
            <select id="tdlocation" class="selectpicker show-tick show-menu-arrow" onchange="this.form.submit()">
                @foreach($locations as $location)
                    <option value="{{ $location->id }}">{{ $location->name }}</option>
                @endforeach
            </select>
            </div>
</form>

我有两个问题：

1) 如何将表单操作动态设置为类似

categories/{category->id}/locations/{location->id}

其中，category->id 和 location->id 都将基于用户当前拥有的选项的值 selected

2) 由于表单是在用户更改选项时提交的，因此页面会重新加载并重置两个 <select> 标记。我如何跟踪之前 selected 的选项，并且在页面加载时，我可以向用户显示在提交表单之前 he/she select 哪个选项？

Answer 1

1) 你可以通过 JS 来实现：从 select 中删除 "onchange" 属性，并添加初始代码，如下所示：

$('#tdcategory,#tdlocation').change(function(){
    var category = $('#tdcategory').val();
    var location = $('#tdlocation').val();

    if (category && location) {
        $(this).closest('form')
            .attr('action', '/categories/'+ category +'/locations/' + location)
            .submit();
    }
});

2) 您可以从请求中获取提交的值，并添加一个条件，用于将 selected="selected" 属性插入到每个 select 中，如下所示：

<select id="tdcategory" name="tdcategory" class="selectpicker show-tick show-menu-arrow">
    @foreach($categories as $category)
        <option value="{{ $category->id }}" @if($category->id == request()->get('tdcategory'))selected="selected"@endif>{{ $category->name }}</option>
    @endforeach
</select>

<select id="tdlocation" name="tdlocation" class="selectpicker show-tick show-menu-arrow">
    @foreach($locations as $location)
        <option value="{{ $location->id }}" @if($location->id == request()->get('tdlocation'))selected="selected"@endif>{{ $location->name }}</option>
    @endforeach
</select>

基于 Laravel 中所选选项的表单操作中的动态路由路径

Dynamic route path in form action based on the selected option in Laravel

javascript

forms

laravel

laravel-blade