[英]How to build a tree view with PHP / SQL?
What's the best way to: 最好的方法是:
My table has id
, name
and parent_id
columns. 我的表有id
, name
和parent_id
列。
Here's an update to my last answer, with a counter that gives each ul a nesting 'level' class, and some comments. 这是我最后一个答案的更新,带有一个计数器,该计数器为每个ul嵌套了一个“级别”类,并提供了一些注释。
Could anyone suggest how to adapt this to use table rows, without nesting, but with some kind of class numbering hierarchy for css/js hooks? 谁能建议如何将其改编为使用表行,而无需嵌套,但具有用于css / js挂钩的某种类编号层次结构?
<?
//
// Get the data
//
include_once("inc/config.php");
$query = "SELECT c.*
FROM categories AS c
ORDER BY c.id
LIMIT 1000";
$result = pg_query($db, $query);
//
// Load all the results into the row array
//
while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC))
{
//
// Wrap the row array in a parent array, using the id as they key
// Load the row values into the new parent array
//
$categories[$row['id']] = array(
'id' => $row['id'],
'description' => $row['description'],
'parent_id' => $row['parent_id']
);
}
// print '<pre>';
// print_r($category_array);
// ----------------------------------------------------------------
//
// Create a function to generate a nested view of an array (looping through each array item)
// From: http://68kb.googlecode.com/svn-history/r172/trunk/upload/includes/application/controllers/admin/utility.php
//
function generate_tree_list($array, $parent = 0, $level = 0)
{
//
// Reset the flag each time the function is called
//
$has_children = false;
//
// Loop through each item of the list array
//
foreach($array as $key => $value)
{
//
// For the first run, get the first item with a parent_id of 0 (= root category)
// (or whatever id is passed to the function)
//
// For every subsequent run, look for items with a parent_id matching the current item's key (id)
// (eg. get all items with a parent_id of 2)
//
// This will return false (stop) when it find no more matching items/children
//
// If this array item's parent_id value is the same as that passed to the function
// eg. [parent_id] => 0 == $parent = 0 (true)
// eg. [parent_id] => 20 == $parent = 0 (false)
//
if ($value['parent_id'] == $parent)
{
//
// Only print the wrapper ('<ul>') if this is the first child (otherwise just print the item)
// Will be false each time the function is called again
//
if ($has_children === false)
{
//
// Switch the flag, start the list wrapper, increase the level count
//
$has_children = true;
echo '<ul class="level-' . $level . '">';
$level++;
}
//
// Print the list item
//
echo '<li><a href="?id=' . $value['id'] . '">' . $value['description'] . '</a>';
//
// Repeat function, using the current item's key (id) as the parent_id argument
// Gives us a nested list of subcategories
//
generate_tree_list($array, $key, $level);
//
// Close the item
//
echo '</li>';
}
}
//
// If we opened the wrapper above, close it.
//
if ($has_children === true) echo '</ul>';
}
// ----------------------------------------------------------------
//
// generate list
//
generate_tree_list($categories);
?>
function generate_list($array,$parent,$level)
{
foreach ($array as $value)
{
$has_children=false;
if ($value['parent_id']==$parent)
{
if ($has_children==false)
{
$has_children=true;
echo '<ul>';
}
echo '<li>'.$value['member_name'].' -- '.$value['id'].' -- '.$value['parent_id'];
generate_list($array,$value['id'],$level);
echo '</li>';
}
if ($has_children==true) echo '</ul>';
echo $value['parent_id'];
}
}
MySQL在此主题上写了一篇不错的文章: 在MySQL中管理分层数据
You can create a breadcrumb view style by using arrays, without using a recursive function. 您可以使用数组创建面包屑视图样式,而无需使用递归函数。
Here is my working code: 这是我的工作代码:
First, make a SQL query like this: 首先,进行如下SQL查询:
$category = CHtml::listData(TblCategory::model()->findAllCategory(array( 'distinct'=>true, 'join'=>'LEFT JOIN tbl_category b on b.id = t.cat_parent', 'join'=>'LEFT JOIN tbl_category c on c.cat_parent = 0', 'order' => 'cat_name')),'id','cat_name');
I am using yii related code so you can use normal join
queries, then form an array in a foreach()
function 我使用的警予相关的代码,这样你就可以使用正常的join
查询,然后在形成一个阵列foreach()
函数
public function findAllCategory($condition='',$params=array()) { Yii::trace(get_class($this).'.findAll()','system.db.ar.CActiveRecord'); $criteria=$this->getCommandBuilder()->createCriteria($condition,$params); $category = array(); $cat_before; $parent_id = array(); $cat_before = $this->query($criteria,true); //echo "<br><br><br><br><br><br><br>"; foreach($cat_before as $key => $val) { $category[$key] = $val; $parent_id[$key]['cat_parent'] =$val['cat_parent']; $parent_id[$key]['cat_name'] =$val['cat_name']; foreach($parent_id as $key_1=> $val_1) { if($parent_id[$key]['cat_parent'] == $category[$key_1]['id']) { $category[$key]['cat_name']= $category[$key_1]['cat_name'] .' > '. $parent_id[$key]['cat_name']; } } } return $cat_before; }
Then you can get result using Main cat >> subcat 1 >> subcat_1 inner >> ...
然后,您可以使用Main cat >> subcat 1 >> subcat_1 inner >> ...
获得结果
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