CodeIgniter - 来自数据库的动态相关下拉列表

【问题标题】：CodeIgniter - Dynamic dependant dropdowns from databaseCodeIgniter - 来自数据库的动态相关下拉列表
【发布时间】：2015-12-28 10:02:26
【问题描述】：

有人可以帮忙吗？

我正在尝试将此代码转换为 CI，但我对 JQuery 有问题，因为我不太了解它。

原始代码来自 - http://www.99points.info/2010/12/n-level-dynamic-loading-of-dropdowns-using-ajax-and-php/ - 在 CI 之外完美运行。

我可以显示第一个下拉菜单。

然后在“index2.php”的第 15 行加载“get_chid_categories.php”时出现错误 - 我明白为什么（尝试从“root”中的文件读取数据库），但我不知道如何修复它。

我的观点 - index2.php

<html>
<head>
    <script type="text/javascript" src="http://code.jquery.com/jquery-latest.min.js"></script>

    <script type="text/javascript" src="/jquery.livequery.js"></script>
    <script type="text/javascript">

      $(document).ready(function() {

        //$('#loader').hide();

         $('.parent').livequery('change', function() {

          $(this).nextAll('.parent').remove();
          $(this).nextAll('label').remove();

          $('#show_sub_categories').append('</application/views/img src="loader.gif" style="float:left; margin-top:7px;" id="loader" alt="" />');

           $.post("/get_chid_categories.php", {
            parent_id: $(this).val(),
        }, function(response){

            setTimeout("finishAjax('show_sub_categories', '"+escape(response)+"')", 400);
        });

        return false;
    });
});

     function finishAjax(id, response){
     $('#loader').remove();

     $('#'+id).append(unescape(response));
    } 

</script>
<style>
    .both h4{ font-family:Arial, Helvetica, sans-serif; margin:0px; font-size:14px;}
     #search_category_id{ padding:3px; width:200px;}

     .parent{ padding:3px; width:150px; float:left; margin-right:12px;}
     .both{ float:left; margin:0 0px 0 0; padding:0px;}
</style>
</head>
<body>
    <div id="show_sub_categories">
        <select name="search_category" class="parent">
           <option value="" selected="selected">-- Categories --</option>
        <?php
           foreach ($view->result() as $row)
          {
          ?>
             <option value="<?php echo $row->id;?>"><?php echo $row->category;?></option>
          <?php
        }
        ?>
        </select>   

      </div>
       <br clear="all" /><br clear="all" />
</body>
</html>

控制器 - Swim.php

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

class Swim extends CI_Controller {

    public function __construct()
        {
            parent::__construct();
                $this->datestring = '%d/%m/%Y';
                $this->datewrite = 'Y-d-m';
                $this->load->model('Swim_model');
                $this->load->helper('date');
                $data['not_logged_in'] = 'You are not logged in';
                $this->session->set_userdata($data);
        }

    public function index2()
        {
            $data['main_view'] = 'index2';
            $data['view'] = $this->Swim_model->CRUD_categories();
            $this->load->view('load_view',$data);
        }
}

模型 - Swim_model.php

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

class Swim_model extends CI_Model {

    public function __construct()
        {
            // Call the CI_Model constructor
            parent::__construct();
        }

    public function CRUD_categories()
        {
        return $this->db->select('*')
        ->from('categories')
        ->where('pid', '0')
        ->get();
        }
}

get_child_categories.php - 如果我把它放在'root'中，我只能让它包含这个文件

<?php

if($_REQUEST)
{
    $id     = $_REQUEST['parent_id'];
        $query = $this->db->select('*')
        ->from('categories')
        ->where('pid', $id)
        ->get();
        ?>
        <select name="sub_category" class="parent">
        <option value="" selected="selected">-- Sub Category --</option>
        <?php
    foreach ($query->result() as $row)
{
        ?>
            <option value="<?php echo $row->id;?>"><?php echo $row->category;?></option>
        <?php
        }?>
        </select>   
    <?php   
    }
?>

jquery.livequery.js - 也在'root'中

/*! Copyright (c) 2008 Brandon Aaron (http://brandonaaron.net)
 * Dual licensed under the MIT (http://www.opensource.org/licenses/mit-license.php) 
 * and GPL (http://www.opensource.org/licenses/gpl-license.php) licenses.
 *
 * Version: 1.0.3
 * Requires jQuery 1.1.3+
 * Docs: http://docs.jquery.com/Plugins/livequery
 */

(function($) {

$.extend($.fn, {
    livequery: function(type, fn, fn2) {
        var self = this, q;

        // Handle different call patterns
        if ($.isFunction(type))
            fn2 = fn, fn = type, type = undefined;

        // See if Live Query already exists
        $.each( $.livequery.queries, function(i, query) {
            if ( self.selector == query.selector && self.context == query.context &&
                type == query.type && (!fn || fn.$lqguid == query.fn.$lqguid) && (!fn2 || fn2.$lqguid == query.fn2.$lqguid) )
                    // Found the query, exit the each loop
                    return (q = query) && false;
        });

        // Create new Live Query if it wasn't found
        q = q || new $.livequery(this.selector, this.context, type, fn, fn2);

        // Make sure it is running
        q.stopped = false;

        // Run it immediately for the first time
        q.run();

        // Contnue the chain
        return this;
    },

    expire: function(type, fn, fn2) {
        var self = this;

        // Handle different call patterns
        if ($.isFunction(type))
            fn2 = fn, fn = type, type = undefined;

        // Find the Live Query based on arguments and stop it
        $.each( $.livequery.queries, function(i, query) {
            if ( self.selector == query.selector && self.context == query.context && 
                (!type || type == query.type) && (!fn || fn.$lqguid == query.fn.$lqguid) && (!fn2 || fn2.$lqguid == query.fn2.$lqguid) && !this.stopped )
                    $.livequery.stop(query.id);
        });

        // Continue the chain
        return this;
    }
});

$.livequery = function(selector, context, type, fn, fn2) {
    this.selector = selector;
    this.context  = context || document;
    this.type     = type;
    this.fn       = fn;
    this.fn2      = fn2;
    this.elements = [];
    this.stopped  = false;

    // The id is the index of the Live Query in $.livequery.queries
    this.id = $.livequery.queries.push(this)-1;

    // Mark the functions for matching later on
    fn.$lqguid = fn.$lqguid || $.livequery.guid++;
    if (fn2) fn2.$lqguid = fn2.$lqguid || $.livequery.guid++;

    // Return the Live Query
    return this;
};

$.livequery.prototype = {
    stop: function() {
        var query = this;

        if ( this.type )
            // Unbind all bound events
            this.elements.unbind(this.type, this.fn);
        else if (this.fn2)
            // Call the second function for all matched elements
            this.elements.each(function(i, el) {
                query.fn2.apply(el);
            });

        // Clear out matched elements
        this.elements = [];

        // Stop the Live Query from running until restarted
        this.stopped = true;
    },

    run: function() {
        // Short-circuit if stopped
        if ( this.stopped ) return;
        var query = this;

        var oEls = this.elements,
            els  = $(this.selector, this.context),
            nEls = els.not(oEls);

        // Set elements to the latest set of matched elements
        this.elements = els;

        if (this.type) {
            // Bind events to newly matched elements
            nEls.bind(this.type, this.fn);

            // Unbind events to elements no longer matched
            if (oEls.length > 0)
                $.each(oEls, function(i, el) {
                    if ( $.inArray(el, els) < 0 )
                        $.event.remove(el, query.type, query.fn);
                });
        }
        else {
            // Call the first function for newly matched elements
            nEls.each(function() {
                query.fn.apply(this);
            });

            // Call the second function for elements no longer matched
            if ( this.fn2 && oEls.length > 0 )
                $.each(oEls, function(i, el) {
                    if ( $.inArray(el, els) < 0 )
                        query.fn2.apply(el);
                });
        }
    }
};

$.extend($.livequery, {
    guid: 0,
    queries: [],
    queue: [],
    running: false,
    timeout: null,

    checkQueue: function() {
        if ( $.livequery.running && $.livequery.queue.length ) {
            var length = $.livequery.queue.length;
            // Run each Live Query currently in the queue
            while ( length-- )
                $.livequery.queries[ $.livequery.queue.shift() ].run();
        }
    },

    pause: function() {
        // Don't run anymore Live Queries until restarted
        $.livequery.running = false;
    },

    play: function() {
        // Restart Live Queries
        $.livequery.running = true;
        // Request a run of the Live Queries
        $.livequery.run();
    },

    registerPlugin: function() {
        $.each( arguments, function(i,n) {
            // Short-circuit if the method doesn't exist
            if (!$.fn[n]) return;

            // Save a reference to the original method
            var old = $.fn[n];

            // Create a new method
            $.fn[n] = function() {
                // Call the original method
                var r = old.apply(this, arguments);

                // Request a run of the Live Queries
                $.livequery.run();

                // Return the original methods result
                return r;
            }
        });
    },

    run: function(id) {
        if (id != undefined) {
            // Put the particular Live Query in the queue if it doesn't already exist
            if ( $.inArray(id, $.livequery.queue) < 0 )
                $.livequery.queue.push( id );
        }
        else
            // Put each Live Query in the queue if it doesn't already exist
            $.each( $.livequery.queries, function(id) {
                if ( $.inArray(id, $.livequery.queue) < 0 )
                    $.livequery.queue.push( id );
            });

        // Clear timeout if it already exists
        if ($.livequery.timeout) clearTimeout($.livequery.timeout);
        // Create a timeout to check the queue and actually run the Live Queries
        $.livequery.timeout = setTimeout($.livequery.checkQueue, 20);
    },

    stop: function(id) {
        if (id != undefined)
            // Stop are particular Live Query
            $.livequery.queries[ id ].stop();
        else
            // Stop all Live Queries
            $.each( $.livequery.queries, function(id) {
                $.livequery.queries[ id ].stop();
            });
    }
});

// Register core DOM manipulation methods
$.livequery.registerPlugin('append', 'prepend', 'after', 'before', 'wrap', 'attr', 'removeAttr', 'addClass', 'removeClass', 'toggleClass', 'empty', 'remove');

// Run Live Queries when the Document is ready
$(function() { $.livequery.play(); });


// Save a reference to the original init method
var init = $.prototype.init;

// Create a new init method that exposes two new properties: selector and context
$.prototype.init = function(a,c) {
    // Call the original init and save the result
    var r = init.apply(this, arguments);

    // Copy over properties if they exist already
    if (a && a.selector)
        r.context = a.context, r.selector = a.selector;

    // Set properties
    if ( typeof a == 'string' )
        r.context = c || document, r.selector = a;

    // Return the result
    return r;
};

// Give the init function the jQuery prototype for later instantiation (needed after Rev 4091)
$.prototype.init.prototype = $.prototype;

})(jQuery);

此文件会将类别加载到 MYSQL 数据库中

CREATE TABLE IF NOT EXISTS `categories` (
  `id` int(11) NOT NULL auto_increment,
  `category` varchar(50) NOT NULL,
  `pid` int(11),
  PRIMARY KEY  (`id`)
);

--
-- Dumping data for table `categories`
--

INSERT INTO `categories` (`id`, `category`, `pid`) VALUES
(1, 'Barncroft',0),
(2, 'Mary Rose',0),
(3, 'Petersfield',0),
(4, 'Redwood',0),
(5, 'Springfield',0),
(6, 'Mon',1),
(7, 'Tue',1),
(8, 'Wed',1),
(9, 'Thu',1),
(10, 'Fri',1),
(11, 'Sat',1),
(12, 'Sun',1),
(13, 'Mon',2),
(14, 'Tue',2),
(15, 'Wed',2),
(16, 'Thu',2),
(17, 'Fri',2),
(18, 'Sat',2),
(19, 'Sun',2),
(20, 'Mon',3),
(21, 'Tue',3),
(22, 'Wed',3),
(23, 'Thu',3),
(24, 'Fri',3),
(25, 'Sat',3),
(26, 'Sun',3),
(27, 'Mon',4),
(28, 'Tue',4),
(29, 'Wed',4),
(30, 'Thu',4),
(31, 'Fri',4),
(32, 'Sat',4),
(33, 'Sun',4),
(34, 'Mon',5),
(35, 'Tue',5),
(36, 'Wed',5),
(37, 'Thu',5),
(38, 'Fri',5),
(39, 'Sat',5),
(40, 'Sun',5),
(41, '07:00',6),
(42, '07:30',6),
(43, '08:00',6),
(44, '08:30',6),
(45, '09:00',6),
(46, '09:30',6),
(47, '10:00',6),
(48, '10:30',6),
(49, '11:00',6);

【问题讨论】：

    标签： php jquery codeigniter codeigniter-3


    【解决方案1】：

    我会尝试将 get_child_categories 作为一种方法添加到您的游泳控制器：

    function get_child_categories()
{

    $id = $_REQUEST['parent_id'];
     $query = $this->db->select('*')->from('categories')->where('pid', $id)->get();

    $html = '<select name="sub_category" class="parent">';
    $html .= '<option value="" selected="selected">-- Sub Category --</option>';

    foreach ($query->result() as $row){
        $html .= '<option value="'.$row->id.'">'.$row->category.'</option>';
    }

    $html .= '</select>';

    echo $html;

}

    在你看来，你会这样称呼它：

    $.post("swim/get_child_categories", { //etc

    【讨论】：

    • Thanx，但视图中的调用不起作用。我放了'echo $id;'在方法中，我什么也没得到。
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