Codeigniter 3表格：提交后保存数据

问题描述：

I am making a customers CRUD application with Codeigniter 3. The "Add Customer" form view looks like this:

<div class="form-group <?php if(form_error('first_name')) echo 'has-error';?>">
    <?php echo form_input('first_name', '', [
        'type'  => 'text',
        'id'    => 'first_name', 
        'class' => 'form-control',
        'value' => '',
        'placeholder' => 'First name',
        ]); 
    ?>
    <?php echo form_error('first_name'); ?>                                     
</div>

The form also has validation on some of the text fields. I wish the data that is imputed, if data is invalid, would stay after submit. What shall I add to the code above?

我正在使用Codeigniter创建客户CRUD应用程序3.“添加客户”表单视图 em >看起来像这样： p>

 ＆lt; div class =“form-group＆lt;？php if（form_error（'first_name'））echo'has-error';？＆gt  ;“＆gt; 
＆lt;？php echo form_input（'first_name'，''，[
'type'=＆gt;'text'，
'id'=＆gt;'first_name'，
'class'  =＆gt;'form-control'，
'value'=＆gt;''，
'占位符'=＆gt;'名字'，
]）;  
？＆gt; 
＆lt;？php echo form_error（'first_name'）;  ？＆GT;  
＆lt; / div＆gt; 
  code>  pre> 
 
 该表单还对某些文本字段进行了验证。 我希望估算的数据如果数据无效 em>，将在提交后保留。 我应该在上面的代码中添加什么？ p> 
  div>

答

According to the Codeigniter 3 official documentation, this is how the code should look in order for the input fields data to be kept if the form is not submitted:

<?php echo form_input('first_name', set_value('first_name'), [
   'type'  => 'text',
   'id'    => 'first_name', 
   'class' => 'form-control',
   'placeholder' => 'First name',
]);?>

答

In your form_input function, Set value key as set_value() for text fields , set_select() for select , set_checkbox() for checkbox and set_radio() for radio button. This will repopulate your from after submitting the form even if the page is refreshed. See below example for your first name text field, where i put value as set_value('first_name'). this function set the posted value there after validation put the form back.

You can see more validation rules here

   <div class="form-group <?php if(form_error('first_name')) echo 'has-error';?>">
<input type="text" id="first_name" class="form-control" value="<?php echo set_value('first_name');?>" placeholder="First name" />

        <?php echo form_error('first_name'); ?>                                     
    </div>

And on your controller, you must set the first_name in validation rule like below

  $this->form_validation->set_rules('first_name', 'First name', 'required');

You must set this rules for each field even if it is not required or dont have any rules. You can also leave the rules parameter blank.

答

As I know you can do 2 things on here

Use AJAX
Use session

Using AJAX means you can check filed validation + from validation and then SUBMIT the form. So your data remain till last.

Save it to session when submitting and the after redirect load it back to respective fields.

Codeigniter 3表格：提交后保存数据

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