（原始问题）我使用jquery ui的可选脚本来控制我的webapp中的特定活动关键字。在此处查看：www.rickymason.net/letschat/main/home以供参考
我对javascript的经验很少，我正在试图弄清楚如何在我的主模型中启动一个函数。
根据答案更新了功能：
我已更新我的代码以支持新的JSON / AJAX格式。这需要我创建一个活动/非活动会话过滤器，以便用户可以正常添加过滤器，并始终使用AJAX来更新线程列表。这对我来说更有意义。
这是我目前的代码，但仍然无效。我试图在用户单击可选类别（通过Jquery UI）时这样做，与选择关联的divID通过AJAX传递并返回更新div id =“board”的threadlist数组。
这是我当前的Controller设置：
public function home($page = 'home')
{
$data['user_id'] = $this->tank_auth->get_user_id();
$data['username'] = $this->tank_auth->get_username();
$data['threads'] = $this->thread_model->session_load();
$data['title'] = ucfirst($page); // Capitalize the first letter
$data['page'] = $page;
$this->load->view('templates/head', $data);
$this->load->view('templates/nav', $data);
$this->load->view('main/newthread', $data);
$this->load->view('main/addfilter', $data);
$this->load->view('main/checkbox', $data);
$this->load->view('main/displayfilter',$data);
$this->load->view('main/board', $data);
$this->load->view('templates/footer');
}
public function updatefilters($filters)
{
$filterarray = split("|", $filters);
$this->thread_model->create_session_filter($filterarray);
$threadarray = $this->thread_model->get_threads();
$data['json'] = '{"content":' + $threadarray + '}';
$this->load->view('json_view', $data); // See step 4!!!
}
这是我目前的型号代码：
public function get_threads()
{
$filter = $this->session->userdata('filter');
$num_tags = count($filter);
if ($num_tags > 0 && $num_tags <= 8) {
$sql_select = "SELECT DISTINCT t.* ";
$sql_from = " FROM ";
$sql_where = " WHERE ";
$sql_joins = "";
$sql_order = "ORDER BY t.timestamp DESC";
for ($i=0;$i<$num_tags;++$i) {
if ($i==0) {
$sql_from .= " filter AS f ";
$sql_where .= " f.tag LIKE '%" . $filter[0] . "%'";
$sql_joins .= " INNER JOIN filter_thread AS ft ON ft.filter_id = f.filter_id
INNER JOIN thread AS t ON ft.thread_id = t.thread_id";
}
else {
$sql_where .= " OR f.tag LIKE '%" . $filter[$i] . "%'";
}
}
} else {
break;
}
$sql = $sql_select . $sql_from . $sql_joins . $sql_where . $sql_order;
$query = $this->db->query($sql);
$thread = $query->result_array();
return json_encode($thread); //I am aware this is not correct
}
public function create_session_filter($filterstring)
{
$filterarray[] = $filterstring;
$filter['filter'] = $filterarray;
if ($this->session->userdata('filter') == TRUE) {
$sessionfilter = $this->session->userdata('filter');
$new = array_merge($sessionfilter, $filter['filter']);
$this->session->unset_userdata('filter');
$filter['filter'] = $new;
$this->session->set_userdata($filter);
} else {
if (!$filterstring) {} else {
$this->session->set_userdata($filter);
}
}
}
public function create_session_inactive_filter($filterstring)
{
$filterarray[] = $filterstring;
$filter['inactivefilter'] = $filterarray;
if ($this->session->userdata('inactivefilter') == TRUE) {
$sessionfilter = $this->session->userdata('inactivefilter');
$new = array_merge($sessionfilter, $filter['inactivefilter']);
$this->session->unset_userdata('inactivefilter');
$filter['inactivefilter'] = $new;
$this->session->set_userdata($filter);
} else {
if (!$filterstring) {} else {
$this->session->set_userdata($filter);
}
}
}
这是我目前的观看代码：
应用/主/ json_view.php
<?php
header("Content-Type: application/json");
echo $json;
?>
aplication /主/ bdisplayfilter.php
<script>
$(function() {
$( "#selectable" ).selectable({
selected: updateFilters,
unselected: updateFilters
});
function updateFilters(ev, ui){
alert ("hello");
// get the selected filters
var $selected = $('#selectable').children('.ui-selected');
// create a string that has each filter separated by a pipe ("|")
var filters = $selected.map(function(){return this.id;}).get().join("|");
$.ajax({
url: '/main/updateFilters', //see step 2
data: { filters: filters },
success: function(data){
// data is whatever json you decide to return from the server.
// An easy way to do things is have data look like this:
// { content: "<div>All my new threads that I want to show up</div>" }
// then, you can replace some element on the page with the new content
// For example, say your container has an id of threadContainer:
$('#select').replaceWith(data.content);
}
}); }
});
</script>
<ol id="selectable">
<li class="ui-state-default" id="everything">Everything!</li>
<li class="ui-state-default" id="entertainment">Entertainment</li>
<li class="ui-state-default" id="sci/tech">Sci/Tech</li>
<li class="ui-state-default" id="news">News</li>
<?php
if ($this->session->userdata('inactivefilter') == true) {
$inactivefilter = $this->session->userdata('inactivefilter');
foreach ($inactivefilter as $new)
{
echo "<li class='ui-state-default' id='custom'>$new</li>";
}
}
?>
</ol>
<?php
if ($this->session->userdata('inactivefilter') == true) {
echo "<form action='".base_url()."main/clear_filter'><input type='submit' value=clear></form>";
} ?>
答案 0 :(得分：3)
编辑：我已更新了ajax调用的url和数据部分，并添加了一个额外的步骤来启用查询字符串参数。
1）进行AJAX通话
您需要对选定和未选择的内容进行相同的调用，因为您可以拥有多个过滤器，并且需要在两个事件上相应地更新内容。所以，我将定义一个两个事件都可以调用的公共函数。
$(function() {
$( "#selectable" ).selectable({
selected: updateFilters,
unselected: updateFilters
});
function updatefilters(ev, ui){
// get the selected filters
var $selected = $('#selectable').children('.ui-selected');
// create a string that has each filter separated by a pipe ("|")
var filters = $selected.map(function(){return this.id;}).get().join("|");
$.ajax({
url: '/index.php',
data: { c: main, m: updateFilters, filters: filters },
success: function(data){
// data is whatever json you decide to return from the server.
// An easy way to do things is have data look like this:
// { content: "<div>All my new threads that I want to show up</div>" }
// then, you can replace some element on the page with the new content
// For example, say your container has an id of threadContainer:
$('#threadContainer').replaceWith(data.content);
}
});
}
});
2）在application / config.php中启用查询字符串参数
本文底部的“启用查询字符串”一节说明了如何执行此操作： http://codeigniter.com/user_guide/general/urls.html
3）创建将接收过滤器的操作
请注意，我正在使用一个名为Page的控制器（它位于/application/controllers/page.php中）。此操作（updateFilters）可以存在于您想要的任何控制器中。
class Page extends CI_Controller {
function __construct()
{
parent::__construct();
}
function index()
{
}
function updateFilters($filters)
{
$filterarray = split("|", $filters);
create_session_filter($filterarray);
$articlesHTML = getThreadList($filterarray); // See step 4!!!
$data['json'] = '{"content":' + $articlesHTML + '}';
$this->load->view('json_view', $data); // See step 5!!!
}
/* I've updated this slightly to accept an array */
public function create_session_filter($filterarray)
{
$filter['filter'] = $filterarray;
//... the rest of your stuff you already had
}
}
4）实施getThreadList方法
如果你已经为此设置了一些东西，我认为你没有提到过。这将基本上采用一组过滤器，然后基于此呈现线程列表。
5）创建json_view（如果还没有）
这将设置内容类型，以便浏览器知道内容是json。
在/application/views/json_view.php中：
<?php
header("Content-Type: application/json");
echo $json;
?>