javascript 在 codeigniter 中有条件地设置会话数据

Conditionally set session data in codeigniter

提问by Nishant Jani

i want to set my session data in my view but Conditionally, so in javascript portion of my view i have

我想在我的视图中设置我的会话数据，但有条件地，所以在我的视图的 javascript 部分我有

$('#demo').click(function(){
$this->session->set_userdata('sample',10);
});

However , whenever i refresh my page , without clicking the button , the session data , "sample" is set, is there a way i can get this session data set ONLY after i click the button ?

但是，每当我刷新页面时，不单击按钮，会话数据“示例”已设置，有没有办法仅在单击按钮后才能获取此会话数据集？

Thank you

谢谢

回答by Fran Verona

You're mixing Javascript and PHP (client-side and server-side). You can do it by using Ajax like this:

您正在混合使用 Javascript 和 PHP（客户端和服务器端）。您可以像这样使用 Ajax 来做到这一点：

$('#demo').click(function(){
  $.ajax({
     type: "POST",
     url: "mycontroller/sessions"
   }).done(function( msg ) {
     alert( "Data Saved: " + msg );
   });
});

And in your Mycontroller.phpfile, you should create a function called "sessions":

在您的Mycontroller.php文件中，您应该创建一个名为“会话”的函数：

function sessions(){
   $this->session->set_userdata('sample',10);
}

If you need to pass information from Javascript to PHP:

如果您需要将信息从 Javascript 传递到 PHP：

var dummy = 10;
$('#demo').click(function(){
   $.ajax({
      type: "POST",
      url: "mycontroller/sessions",
      data: { value: dummy }
   }).done(function( msg ) {
      alert( "Data Saved: " + msg );
   });
});


function sessions($value){
   $this->session->set_userdata('sample',$value);
}

More information about Ajax in JQuery http://api.jquery.com/jQuery.ajax/

有关 JQuery 中 Ajax 的更多信息http://api.jquery.com/jQuery.ajax/

EDIT:

编辑：

To check if a session variable exists in CodeIgniter:

要检查 CodeIgniter 中是否存在会话变量：

function sessions(){
   $sId = $this->session->userdata('session_id');
   if(isset($sId)){
      // session_id exist
   }
}

Section "Retrieving Session Data" http://codeigniter.com/user_guide/libraries/sessions.html

“检索会话数据”部分http://codeigniter.com/user_guide/libraries/sessions.html

回答by tGilani

The following method returns FALSE if variable in session is not set

如果未设置会话中的变量，则以下方法返回 FALSE

$this->session->userdata('sample')

Otherwise it returns the appropriate value.

否则它返回适当的值。