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我有 2 个选择列表

  1. ausers - 列出所有可用用户
  2. susers - 显示选定的用户

我使用moodlesglobal $SESSION变量来存储用户选择项，然后我使用该变量将选定项加载到susers 列表中$SESSION->susers 。当用户单击“添加用户”按钮时会发生这种情况。

我正在使用会话变量来保存选择，因为我需要多次发布表单。（表格将有另一个课程选择列表）

我无法使用 javascript 来完成此操作，因为我的客户希望脚本在没有 js 支持的情况下运行。

笔记 ：

我的代码正确加载了选项，但在选择列表中显示了当前$SESSION数据和以前的$SESSION数据。我认为问题可能是选择元素的刷新问题。我使用以下语句在 susers 元素中加载选定的用户 $susers_el->load($susers);

为了更好地说明问题：

在“添加用户”按钮上单击

选定用户 (ausers) 1.Joe 2.James 选择列表 (susers) 1.Joe 2.James

当我想将另一个用户添加到 susers 列表时，会发生以下情况：在“添加用户”按钮上单击

选定用户 (ausers) 3.Lance 选择列表 (susers) 1.Joe 2.James 1.Joe 2.James 3.Lance

以下是当前代码，非常感谢任何帮助或建议。

class learner_progress_form extends moodleform {
  function definition() {
    global $SESSION, $CFG;
    fb('Create form');
    $mform  = & $this->_form;
    //User Section
    $mform->addElement('header', 'site_users', 'Site Users');
    $objs[]    = array();
    $ausers[]  = array();
    //All users & courses sessions
    $SESSION->all_users   = $this->get_all_users(); 
    //Available users $ courses
    $ausers   = $SESSION->all_users; 
    //Form design
    $objs[0] =& $mform->createElement('select', 'ausers', 'Available users', $ausers, 'size="15"');
    $objs[0]->setMultiple(true);
    $objs[1] =& $mform->createElement('select', 'susers', 'Selected users', null, 'size="15"');
    $objs[1]->setMultiple(true);
    $grp =& $mform->addElement('group', 'usersgrp', 'Users', $objs, ' ', false);

    $objs = array();
    $objs[] =& $mform->createElement('submit', 'uaddsel','Add');
    $objs[] =& $mform->createElement('submit', 'uremovesel', 'Remove');
    $grp =& $mform->addElement('group', 'ubuttonsgrp', null, $objs, array(' ', '<br />'), false);
    $renderer =& $mform->defaultRenderer();
    $template = '<label class="qflabel" style="vertical-align:top">{label}</label> {element}';
    $renderer->setGroupElementTemplate($template, 'usersgrp');

    //Button Section
    $mform->addElement('header','actions','Generate report');
    $objs = array();
    $objs[] =& $mform->createElement('submit', 'submit', 'Go');
    $mform->addElement('group', 'actionsgrp', 'Generate report with selected data', $objs, ' ', false);
  }

  function definition_after_data() {
    global $SESSION;
    fb('definition after data');
    $mform      =& $this->_form; 
    //Get users group and elements
    $usersgrp   =& $mform->getElement('usersgrp')->getElements();
    //Selected Users
    $susers_el  =& $usersgrp[1]; //selected users 
    $susers     = $SESSION->susers;
    $susers_el->load($susers); 
  }

function get_all_users() {
    global $SESSION, $CFG;
    $ausers = array();
    $userlist = get_records_sql(
      "select id, firstname, lastname, email 
      from {$CFG->prefix}user
      where id NOT IN (0,1,2)"); //exclude empty,admin & guest
    foreach($userlist as $user){
      if (!empty($user) ) {
        $ausers[$user->id] = $user->firstname." ".$user->lastname;
      }
    }
    //sort($ausers);
    return $ausers;
  }

/**
 * Add user(s) selections to list
 * $SESSION->s_users : Stores previous selections
 * TBD   : Seems to be a refresh bug
 * TOFIX : Duplication - possible refresh bug 
 **/
  function set_user_selections() {
    global $SESSION, $CFG;
    $usergrp        =& $this->_form->getElement('usersgrp')->getElements();
    $ausers_el      =& $usergrp[0];
    $susers_el      =& $usergrp[1];
    $susers         = $ausers_el->getSelected();
    $ausers         = $SESSION->all_users;
    $users          = array();
    //build selected users array
    foreach ($susers as $user=>$id) {
      $users[$id] = $ausers[$id];
    }
    //Check selected user sessions
    if (isset($SESSION->susers) )
    {
      //Remove duplicate selections
      foreach ($SESSION->susers as $id=>$val) {
        if (in_array($id, $users) )
        {
          unset($SESSION->susers[$id]);
        }
      }
      $users = $SESSION->susers + $users;
    }
    $SESSION->susers = $users;
    //asort($users);
    fb('User being loaded in select list');
    fb($users);
    $susers_el->load($users);
  }
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1 回答 1

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解决了！ 我基本上必须检查 $_POST 变量才能在我的选择列表上执行适当的操作。definition_after_data每次加载表单（刷新、发布等）时，都必须在函数中完成此操作。会话变量可以很好地保持加载用户以前的选择。

这些简单的代码行解决了我的问题。

//Load users  
if (!isset($_POST['uaddsel']) and !isset($_POST['uremovesel']) ) { 
  $this->load_session_users(); //load previous selected user in susers 
} 
//Load courses 
if (!isset($_POST['caddsel']) and !isset($_POST['cremovesel']) ) { 
  $this->load_session_courses(); 
}

在我的 index.php 中，我会调用：

//Add user
  if (isset($_POST['uaddsel']) ) {
    //add user
    $form->set_user_selections();
  }
  //remove user
  if (isset($_POST['uremovesel']) ) {
    $form->remove_selected_users();
  }
于 2011-05-06T18:13:57.963 回答