Codeigniter 3 flashdata 引导消息未显示，尽管数据已添加到数据库

Question

制作一个简单的 codeigniter 3 Web 应用程序 我想通过表单将类别名称添加到数据库，但即使在提交后，设置的 flashdata 消息也没有显示在前端..尽管我可以看到数据添加到 phpmyadmin 中的表中

这是我的代码视图list.php

<?php $this->load->view('admin/header'); ?>

    <!-- Content Header (Page header) -->
    <div class="content-header">
      <div class="container-fluid">
        <div class="row mb-2">
          <div class="col-sm-6">
            <h1 class="m-0 text-dark">Categories</h1>
          </div><!-- /.col -->
          <div class="col-sm-6">
            <ol class="breadcrumb float-sm-right">
              <li class="breadcrumb-item"><a href="#">Home</a></li>
              <li class="breadcrumb-item active">Categories</li>
            </ol>
          </div><!-- /.col -->
        </div><!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content-header -->
 <!-- Main content -->
    <div class="content">
      <div class="container-fluid">
        <div class="row">
          <div class="col-lg-12">
               <?php 
      if($this->session->flashdata('success') !=  ""){ ?>
         <div class='alert alert-success mb-3'><?php echo $this->session->flashdata('success');?></div>;
    <?php  }
       ?>
              
             <!--<div class="alert alert-success">success</div>-->
            <div class="card">
               <!--<div class="card-body d-flex justify-content-center align-items-center" style="height:450px;">
                <h3 class="">Welcome to Codeigniter Web Console</h5>
              </div>-->
              <div class="card-header">
                 <div class="card-title">
                     <form id="SearchFrm" name="searchFrm" action="" method="">
                          <div class="input-group mb-0">
                              <input type="text" value="" class="form-control" placeholder="Search" id="" name="q">
                              <div class="input-group-append">
                                <button class="input-group-text"><i class="fas fa-search"></i></button>
                              </div>
                         </div>
                     </form>
                    
                 </div><!--card-title-->
                 <div class="card-tools">
                     <a href="<?php echo base_url().'admin/category/create' ?>" class="btn btn-primary"><i class="fas fa-plus"></i> Create </a>
                 </div>
              </div><!--card-header-->
              
              <div class="card-body">
                  <table class="table table-striped">
                    <thead>
                      <tr>
                        <th width="50">#</th>
                        <th>Name</th>
                        <th width="100">Status</th>
                        <th width="160" class="text-center">Action</th>
                      </tr>
                    </thead>
                    <tbody>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                     
                    </tbody>
                 </table>
              </div><!--card-body-->
              
            </div>
          </div>
          <!-- /.col-md-6 -->
       
        </div>
        <!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content -->
  </div>
  <!-- /.content-wrapper -->

<?php $this->load->view('admin/footer'); ?>
 

 

我什至尝试过这个代码

 <?php if($this->session->flashdata('success') != ""){ ?>
             <div class="alert alert-success"><?php echo $this->session->flashdata('success'); ?></div>
             <?php } ?>

但这也不起作用

更新 正如 dontpanic 所说，我已经更新了我的代码 类别.php(控制器)

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Category extends CI_Controller {

   
    //this method will show category list page
    public function index()
    {
     $this->load->view('admin/category/list');
    }
    
    //this method will show create category page
    public function create()
    {
     $this->load->model('Category_model');
     $this->load->library('form_validation');
      $this->form_validation->set_error_delimiters(' <p class="text-danger">','</p>');
      $this->form_validation->set_rules('name','Name','trim|required');

      if($this->form_validation->run() == true){
          //will check category in database
          $formArray['name'] = $this->input->post('name');
          $formArray['status'] = $this->input->post('status');
          $formArray['created_at'] = date('Y-m-d H:i:s');
          $this->Category_model->create($formArray);
          
          $this->session->flashdata('success','Category added successfully');
          redirect (base_url().'admin/category/index');
          
      }else{
          //Will show errors
          $this->load->view('admin/category/create');  
      }
    
    // $this->load->view('admin/category/create');  
    }
    
   //this method will show edit category page
    public function edit()
    {
        
    }
    
    //this method will will  delete a category 
    public function delete()
    {
        
    }
}

Category_model.php（模型）

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Category_model extends CI_Model {
    
    public function create($formArray){
      $this->db->insert('categories',$formArray);
    
  }
   
}

并更新了 list.php（根据 vansh patel 的提示）（视图）

<?php $this->load->view('admin/header'); ?>

    <!-- Content Header (Page header) -->
    <div class="content-header">
      <div class="container-fluid">
        <div class="row mb-2">
          <div class="col-sm-6">
            <h1 class="m-0 text-dark">Categories</h1>
          </div><!-- /.col -->
          <div class="col-sm-6">
            <ol class="breadcrumb float-sm-right">
              <li class="breadcrumb-item"><a href="#">Home</a></li>
              <li class="breadcrumb-item active">Categories</li>
            </ol>
          </div><!-- /.col -->
        </div><!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content-header -->
 <!-- Main content -->
    <div class="content">
      <div class="container-fluid">
        <div class="row">
          <div class="col-lg-12">
               <?php 
               $flashdata = $this->session->flashdata('success');
      if($flashdata !=  ""){ ?>
         <div class='alert alert-success mb-3'><?php echo $this->session->flashdata('success');?></div>;
    <?php  }
       ?>
              
             <!--<div class="alert alert-success">success</div>-->
            <div class="card">
               <!--<div class="card-body d-flex justify-content-center align-items-center" style="height:450px;">
                <h3 class="">Welcome to Codeigniter Web Console</h5>
              </div>-->
              <div class="card-header">
                 <div class="card-title">
                     <form id="SearchFrm" name="searchFrm" action="" method="">
                          <div class="input-group mb-0">
                              <input type="text" value="" class="form-control" placeholder="Search" id="" name="q">
                              <div class="input-group-append">
                                <button class="input-group-text"><i class="fas fa-search"></i></button>
                              </div>
                         </div>
                     </form>
                    
                 </div><!--card-title-->
                 <div class="card-tools">
                     <a href="<?php echo base_url().'admin/category/create' ?>" class="btn btn-primary"><i class="fas fa-plus"></i> Create </a>
                 </div>
              </div><!--card-header-->
              
              <div class="card-body">
                  <table class="table table-striped">
                    <thead>
                      <tr>
                        <th width="50">#</th>
                        <th>Name</th>
                        <th width="100">Status</th>
                        <th width="160" class="text-center">Action</th>
                      </tr>
                    </thead>
                    <tbody>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                      <tr>
                        <td>1</td>
                        <td>Fashion</td>
                        <td><span class="badge badge-success">Staus</span></td>
                        <td class="text-center"><a href="" class="btn btn-sm  btn-primary"><i class="fas fa-edit"></i> Edit</a><a href="" class="btn btn-sm btn-danger ml-1"><i class="fas fa-trash-alt"></i> Delete</a></td>
                      </tr>
                     
                    </tbody>
                 </table>
              </div><!--card-body-->
              
            </div>
          </div>
          <!-- /.col-md-6 -->
       
        </div>
        <!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content -->
  </div>
  <!-- /.content-wrapper -->

<?php $this->load->view('admin/footer'); ?>
 

create.php（视图）（其中存在用于添加类别的表单）

<?php $this->load->view('admin/header'); ?>

    <!-- Content Header (Page header) -->
    <div class="content-header">
      <div class="container-fluid">
        <div class="row mb-2">
          <div class="col-sm-6">
            <h1 class="m-0 text-dark">Categories</h1>
          </div><!-- /.col -->
          <div class="col-sm-6">
            <ol class="breadcrumb float-sm-right">
              <li class="breadcrumb-item"><a href="#">Home</a></li>
              <li class="breadcrumb-item"><a href="<?php echo base_url().'admin/category/index' ?>">Categories</a></li>
              <li class="breadcrumb-item active">Create New Category</li>
            </ol>
          </div><!-- /.col -->
        </div><!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content-header -->
 <!-- Main content -->
    <div class="content">
      <div class="container-fluid">
        <div class="row">
          <div class="col-lg-12">
            <div class="card card-primary">
               <!--<div class="card-body d-flex justify-content-center align-items-center" style="height:450px;">
                <h3 class="">Welcome to Codeigniter Web Console</h5>
              </div>-->
              <div class="card-header">
                 <div class="card-title">
                     Create New Category
                  </div><!--card-title-->
              </div><!--card-header-->
              <form name="categoryForm" id="categoryForm" method="post" action="<?php echo base_url().'admin/category/create' ?>">
                  <div class="card-body">
                      
                          <div class="form-group">
                            <label>Name</label>
                            <input type="text" class="form-control <?php echo( form_error('name') != "") ? 'is-invalid' : ''; ?>" value="" name="name" id="name">
                            
                          <?php echo form_error('name');?>
  
                           
                          </div>
                          
                          <div class="form-group">
                            <label>Image</label>
                            <input type="file" class="form-control-file border" name="image" id="image">
                          </div>
                          
                          <div class="form-group row">
                              <div class="col-sm-1 col-xs-1">
                                  <div class="custom-control custom-radio">
                                      <input class="custom-control-input" type="radio" value="1" id="statusActive" name="status" checked>
                                      <label for="statusActive" class="custom-control-label">Active</label>
                                   </div>
                              </div>
                              <div class="col-sm-1 col-xs-1">
                                   <div class="custom-control custom-radio ml-3">
                                      <input class="custom-control-input" type="radio" value="0" id="statusBlock" name="status">
                                      <label for="statusBlock" class="custom-control-label">Block</label>
                                  </div>
                              </div>
                              
                          </div>
                      
                           <!--<div class="custom-control custom-radio float-left">
                              <input class="custom-control-input" type="radio" value="1" id="statusActive" name="statusActive" checked>
                              <label for="statusActive" class="custom-control-label">Active</label>
                            </div>
                            <div class="custom-control custom-radio ml-3">
                              <input class="custom-control-input" type="radio" value="1" id="statusBlock" name="statusBlock">
                              <label for="statusBlock" class="custom-control-label">Block</label>
                            </div>-->
                         
                     
                  </div><!--card-body-->
              
                  <div class="card-footer">
                      <button name="submit" type="submit" class="btn btn-primary">Submit</button>
                      <a href="<?php echo base_url().'admin/category/index' ?>" class="btn btn-secondary">Back</a>
                  </div><!--card-footer-->
             </form>
            </div>
          </div>
          <!-- /.col-md-6 -->
       
        </div>
        <!-- /.row -->
      </div><!-- /.container-fluid -->
    </div>
    <!-- /.content -->
  </div>
  <!-- /.content-wrapper -->

<?php $this->load->view('admin/footer'); ?>
 

Answer 1

if 条件 将 flashdata 消息操作验证为 true，并且在重定向后将在 view 中可见，因此代码将如下

<?php if($this->session->flashdata('success')): ?>

        <div class="alert alert-success">
        <?php echo $this->session->flashdata('success'); ?>
      </div>

<?php endif; ?>