问题描述
正如标题所说,当我尝试使用 laravel/ajax 和控制器内的函数删除我的数据时出现错误:
控制器:
public function destroy($category_id) {
$category_delete = HmsBbrCategory::find($category_id);
$category_delete->delete();
return response()->json([
'status'=>200,'message'=>'Category Deleted!',]);
}
表单和 Ajax:
`delete_category` is the id that opens the delete modal and `delete_category_btn` is the button that will delete the data.
<button type="submit" class="btn btn-primary btn-block delete_category_btn"></i>Yes</button>
<button type="button" value="${cat.category_id}" class="delete_category btn btn-outline-secondary"><i class="fas fa-trash"></i> Delete</button>
$(document).on('click','.delete_category',function (e) {
e.preventDefault();
//click this button(delete_category) to get the value(category_id)
var cat_id = $(this).val();
// alert(cat_id);
$('#delete_cat_id').val(cat_id);
$('#deleteCategoryModal').modal('show');
});
$(document).on('click','.delete_category_btn',function (e) {
e.preventDefault();
var cat_id = $('#delete_cat_id').val();
// alert(cat_id);
//token taken from laravel documentation
$.ajaxSetup({
headers: {
'X-CSRF-TOKEN': $('Meta[name="csrf-token"]').attr('content')
}
});
$.ajax({
type: "DELETE",url: "/clinical/bbr-category-configuration-delete/"+cat_id,dataType: "dataType",success: function (response){
// console.log(response);
$('#category_notif').addClass('alert alert-success');
$('#category_notif').text(response.message);
$('#deleteCategoryModal').modal('hide');
}
});
});
路线:
Route::delete('/bbr-category-configuration-delete/{category_id}',[BBRCategoryConfigurationController::class,'destroy']);
注意事项:
- 我继续在模态中显示 category_id 以证明表正在被检索。
删除按钮的第二个 ajax 函数:$(document).on('click',function (e)
,我也尝试使用 alert(cat_id);
显示 id 以证明该 id 仍然在模态内被识别:
即使存在 category_id,尝试删除后检查页面仍然显示:
message: "Call to a member function delete() on null"
我该怎么做才能解决这个问题?感谢您的帮助。
解决方法
$category_delete
对象为空。也许您发送了错误的 $category_id
。如果您在删除之前检查该类别是否存在,则可以避免该错误。
public function destroy($category_id) {
$category_delete = HmsBbrCategory::find($category_id);
if($category_delete) {
$category_delete->delete();
return response()->json([
'status'=>200,'message'=>'Category Deleted!',]);
}
return response()->json([
'status'=>404,'message'=>'Category Not Found!',]);
}