diff --git a/lib/zin/core/command.class.php b/lib/zin/core/command.class.php
new file mode 100644
index 0000000000..4fa1ca75f9
--- /dev/null
+++ b/lib/zin/core/command.class.php
@@ -0,0 +1,52 @@
+<?php
+declare(strict_types=1);
+/**
+ * The command class file of zin lib.
+ *
+ * @copyright   Copyright 2024 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @author      Hao Sun <sunhao@easycorp.ltd>
+ * @package     zin
+ * @version     $Id
+ * @link        https://www.zentao.net
+ */
+
+namespace zin;
+
+require_once __DIR__ . DS . 'helper.func.php';
+
+/**
+ * The command class.
+ */
+class command
+{
+    public static function addClass(node $node, array $args)
+    {
+        $node->props->class->add(...$args);
+    }
+
+    public static function removeClass(node $node, array $args)
+    {
+
+    }
+
+    public static function remove(node $node)
+    {
+        $node->removed = true;
+    }
+
+    /**
+     * Magic static method for setting property value.
+     *
+     * @access public
+     * @param  string $name  - Property name.
+     * @param  array  $args  - Property values.
+     * @return setting
+     */
+    public static function __callStatic($name, $args)
+    {
+        if(isDebug())
+        {
+            triggerError('Command not found: ' . $name);
+        }
+    }
+}
diff --git a/lib/zin/core/context.class.php b/lib/zin/core/context.class.php
index 5242e49f66..a0b9fe3328 100644
--- a/lib/zin/core/context.class.php
+++ b/lib/zin/core/context.class.php
@@ -19,6 +19,7 @@ require_once dirname(__DIR__) . DS . 'utils' . DS . 'flat.func.php';
 require_once dirname(__DIR__) . DS . 'utils' . DS . 'deep.func.php';
 require_once __DIR__ . DS . 'helper.func.php';
 require_once __DIR__ . DS . 'render.class.php';
+require_once __DIR__ . DS . 'command.class.php';
 require_once __DIR__ . DS . 'js.class.php';
 
 class context extends \zin\utils\dataset
@@ -45,6 +46,10 @@ class context extends \zin\utils\dataset
 
     public array $onRenderCallbacks = array();
 
+    public array $queries = array();
+
+    public ?node $rootNode = null;
+
     public ?render $renderer = null;
 
     public function __construct(string $name)
@@ -243,17 +248,44 @@ class context extends \zin\utils\dataset
         return $rawContent;
     }
 
+    public function addQuery(query $query)
+    {
+        $this->queries[] = $query;
+    }
+
+    /**
+     * Include hooks files.
+     */
+    public function includeHooks(): string
+    {
+        $hookFiles = $this->getHookFiles();
+        ob_start();
+        foreach($hookFiles as $hookFile)
+        {
+            if(!empty($hookFile) && file_exists($hookFile)) include $hookFile;
+        }
+        $hookCode = ob_get_clean();
+        if(!$hookCode) return $hookCode;
+        return '';
+    }
+
+
     public function render(node $node, null|object|string|array $selectors = null, string $renderType = 'html', null|string|array $dataCommands = null, bool $renderInner = false): string|array|object
     {
         $renderer = new render($node, $selectors, $renderType, $dataCommands, $renderInner);
         $this->rendered = true;
         $this->renderer = $renderer;
+        $this->rootNode = $node;
 
+        $hookHtml   = $this->includeHooks();
         $rawContent = $this->getRawContent();
         $zinDebug   = $this->getDebugData();
-        $result     = $renderer->render();
-        $js         = $this->getJS();
-        $css        = $this->getCSS();
+
+        $node->prebuild(true);
+
+        $js     = $this->getJS();
+        $css    = $this->getCSS();
+        $result = $renderer->render();
 
         if(is_object($result)) // renderType = json
         {
@@ -297,12 +329,25 @@ class context extends \zin\utils\dataset
         return $data->output;
     }
 
-    public function handleBeforeBuildNode($node)
+    public function handleBeforeBuildNode(node $node)
     {
         foreach($this->beforeBuildNodeCallbacks as $callback)
         {
             call_user_func($callback, $node);
         }
+
+        if($this->queries)
+        {
+            foreach($this->queries as $query)
+            {
+                if(!$node->is($query->selectors) || !$query->commands) continue;
+                foreach($query->commands as $command)
+                {
+                    list($method, $args) = $command;
+                    call_user_func("\zin\command::{$method}", $node, $args, $this->rootNode);
+                }
+            }
+        }
     }
 
     public function handleBuildNode(stdClass &$data, node $node)
diff --git a/lib/zin/core/hook.class.php b/lib/zin/core/hook.class.php
deleted file mode 100644
index eef5498b23..0000000000
--- a/lib/zin/core/hook.class.php
+++ /dev/null
@@ -1,271 +0,0 @@
-<?php
-declare(strict_types=1);
-/**
- * The hook class file of zin lib.
- *
- * @copyright   Copyright 2023 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
- * @author      Hao Sun <sunhao@easycorp.ltd>
- * @package     zin
- * @version     $Id
- * @link        https://www.zentao.net
- */
-
-namespace zin;
-
-require_once __DIR__ . DS . 'wg.class.php';
-require_once __DIR__ . DS . 'selector.func.php';
-
-/**
- * The hook class.
- */
-class hook
-{
-    /** The global root widget. */
-    public static node $globalRoot;
-
-    /** The root widget. */
-    public node $root;
-
-    /** The selectors object. */
-    public object|null $selectors;
-
-    /**
-     * The items list.
-     *
-     * @var node[]
-     */
-    public array $items;
-
-    /**
-     * Construct the select object.
-     *
-     * @param  array|string|node     $selector
-     * @param  node|null             $root
-     * @access public
-     */
-    public function __construct(array|string|node $selector = '', node|null $root = null)
-    {
-        $this->root      = empty($root) ? static::$globalRoot : $root;
-        $this->selectors = null;
-        $this->items     = array();
-
-        if(is_string($selector))
-        {
-            $this->selectors = parseWgSelector($selector);
-            $this->items     = $this->root->find($this->selectors);
-        }
-        elseif(is_object($selector))
-        {
-            $this->items = array($selector);
-        }
-        elseif(is_array($selector))
-        {
-            $this->items = $selector;
-        }
-    }
-
-    /**
-     * Get item by index.
-     *
-     * @param  int $index
-     * @access public
-     * @return node|null
-     */
-    public function get(int $index = 0): node | null
-    {
-        return isset($this->items[$index]) ? $this->items[$index] : null;
-    }
-
-    /**
-     * Select items by selector.
-     *
-     * @param  string $selector
-     * @access public
-     * @return array
-     */
-    public function select(string $selector): array
-    {
-        $list = array();
-        foreach($this->items as $item) $list = array_merge($list, $item->find($selector));
-        return $list;
-    }
-
-    /**
-     * Get items count.
-     *
-     * @access public
-     * @return int
-     */
-    public function count(): int
-    {
-        return count($this->items);
-    }
-
-    /**
-     * Find items in widget.
-     *
-     * @access public
-     * @return hook
-     */
-    public function find(string $selector): hook
-    {
-        if(empty($selector)) return $this;
-
-        return new select($this->select($selector), $this->root);
-    }
-
-    /**
-     * Get the first item.
-     *
-     * @param  string $selector
-     * @access public
-     * @return hook
-     */
-    public function first(string $selector = ''): hook
-    {
-        if(empty($selector)) return new hook(reset($this->items), $this->root);
-        return $this->find($selector)->first();
-    }
-
-    /**
-     * Get the last item.
-     *
-     * @param  string $selector
-     * @access public
-     * @return hook
-     */
-    public function last(string $selector = ''): hook
-    {
-        if(empty($selector)) return new hook(end($this->items), $this->root);
-        return $this->find($selector)->last();
-    }
-
-    /**
-     * Check if the element is match any of the selectors.
-     *
-     * @param  string|array|object $selectors
-     * @access public
-     * @return bool
-     */
-    public function is(string|array|object $selectors): bool
-    {
-        $selectors = parseWgSelectors($selectors);
-        foreach($this->items as $item)
-        {
-            if($item->is($selectors)) return true;
-        }
-        return false;
-    }
-
-    /**
-     * Mark widget been removed.
-     *
-     * @param string $selector
-     * @access public
-     * @return hook
-     */
-    public function remove(string $selector = ''): hook
-    {
-        if(empty($selector))
-        {
-            foreach($this->items as $item) $item->removed = true;
-        }
-        else
-        {
-            $this->find($selector)->remove();
-        }
-        return $this;
-    }
-
-    /**
-     * Append contents to parent.
-     *
-     * @param  node|array|string ...$item
-     * @access public
-     * @return hook
-     */
-    public function append(/* node|array|string ...$item */): hook
-    {
-        $newItems = func_get_args();
-        foreach($this->items as $item) $item->add($newItems);
-        return $this;
-    }
-
-    /**
-     * Set widget classNames.
-     *
-     * @param  node|array|string ...$item
-     * @access public
-     * @return hook
-     */
-    public function setClass(/* string|array ...$className */): hook
-    {
-        return $this->append(setClass(func_get_args()));
-    }
-
-    /**
-     * Set widget style.
-     *
-     * @param  string|array $name
-     * @param  string|null  $value
-     * @access public
-     */
-    public function setStyle(array|string $name, ?string $value = null): hook
-    {
-        return $this->append(setStyle($name, $value));
-    }
-
-    /**
-     * Set widget property.
-     *
-     * @param  string|array|props|null $name
-     * @param  mixed                   $value
-     * @access public
-     */
-    public function setProp(props|array|string $prop, mixed $value = null): hook
-    {
-        foreach($this->items as $item) $item->setProp($prop, $value);
-        return $this;
-    }
-
-    /**
-     * Remove prop from widget.
-     *
-     * @param  string $prop
-     * @access public
-     * @return hook
-     */
-    public function removeProp(string $prop): hook
-    {
-        foreach($this->items as $item) $item->props->remove($prop);
-        return $this;
-    }
-
-    /**
-     * Debug info.
-     *
-     * @access public
-     * @return array
-     */
-    public function __debugInfo(): array
-    {
-        return array(
-            'gid'       => $this->root->gid,
-            'type'      => $this->root->fullType(),
-            'count'     => $this->count(),
-            'selectors' => $this->selectors,
-            'items'     => $this->items
-        );
-    }
-}
-
-/**
- * Create a hook object.
- *
- * @param  array|string|object $selectors
- * @param  node|null             $root
- */
-function hook($selectors = '', $root = null): hook
-{
-    return new hook($selectors, $root);
-}
diff --git a/lib/zin/core/query.class.php b/lib/zin/core/query.class.php
new file mode 100644
index 0000000000..f13e888b5f
--- /dev/null
+++ b/lib/zin/core/query.class.php
@@ -0,0 +1,85 @@
+<?php
+declare(strict_types=1);
+/**
+ * The query class file of zin lib.
+ *
+ * @copyright   Copyright 2024 青岛易软天创网络科技有限公司(QingDao Nature Easy Soft Network Technology Co,LTD, www.cnezsoft.com)
+ * @author      Hao Sun <sunhao@easycorp.ltd>
+ * @package     zin
+ * @version     $Id
+ * @link        https://www.zentao.net
+ */
+
+namespace zin;
+
+require_once __DIR__ . DS . 'wg.class.php';
+require_once __DIR__ . DS . 'selector.func.php';
+require_once __DIR__ . DS . 'query.class.php';
+
+/**
+ * The query class.
+ */
+class query
+{
+    /**
+     * The selector object list.
+     */
+    public array $selectors;
+
+    /**
+     * The command list.
+     */
+    public array $commands = array();
+
+    /**
+     * Construct the query instance.
+     *
+     * @param  object|string|array - $selectors
+     * @access public
+     */
+    public function __construct(object|string|array $selectors)
+    {
+       $this->selectors = parseSelectors($selectors);
+       context::current()->addQuery($this);
+    }
+
+    /**
+     * Magic method for adding commands.
+     *
+     * @access public
+     * @param  string $name - Property name.
+     * @param  array  $args - Property values.
+     * @return query
+     */
+    public function __call(string $name, array $args): query
+    {
+        $this->commands[] = array($name, $args);
+        return $this;
+    }
+
+    /**
+     * Debug info.
+     *
+     * @access public
+     * @return array
+     */
+    public function __debugInfo(): array
+    {
+        return array
+        (
+            'selectors' => $this->selectors,
+            'commands'  => $this->commands
+        );
+    }
+}
+
+/**
+ * Create a query object.
+ *
+ * @param  object|string|array $selectors
+ * @return query
+ */
+function query(object|string|array $selectors): query
+{
+    return new query($selectors);
+}
diff --git a/lib/zin/core/render.class.php b/lib/zin/core/render.class.php
index 887a4c3ca0..8631493a1a 100644
--- a/lib/zin/core/render.class.php
+++ b/lib/zin/core/render.class.php
@@ -68,7 +68,7 @@ class render
 
     public function render(): string|array|object
     {
-        $this->node->prebuild(true);
+        $this->node->prebuild();
 
         if($this->renderType === 'list') return $this->renderList();
         if($this->renderType === 'json') return $this->renderJSON();
diff --git a/lib/zin/core/render.func.php b/lib/zin/core/render.func.php
index 0c283183e5..07ef103f3f 100644
--- a/lib/zin/core/render.func.php
+++ b/lib/zin/core/render.func.php
@@ -56,5 +56,6 @@ function render(string $wgName = '', array $options = array())
 
     /* 渲染并输出 HTML。 Render and display html. */
     $html = $context->render($wg, zget($options, 'selector', null), zget($options, 'type', 'html'), zget($options, 'data', null));
+    ob_start();
     echo $html;
 }
diff --git a/lib/zin/core/zin.func.php b/lib/zin/core/zin.func.php
index da6b3b43b4..97a61b4ab1 100644
--- a/lib/zin/core/zin.func.php
+++ b/lib/zin/core/zin.func.php
@@ -26,6 +26,7 @@ require_once __DIR__ . DS . 'h.func.php';
 require_once __DIR__ . DS . 'item.class.php';
 require_once __DIR__ . DS . 'to.class.php';
 require_once __DIR__ . DS . 'context.func.php';
+require_once __DIR__ . DS . 'query.class.php';
 require_once __DIR__ . DS . 'on.class.php';
 require_once __DIR__ . DS . 'jquery.class.php';
 
@@ -124,18 +125,3 @@ function groupWgInList(node|array $items, string|array $types): array
     $groups[] = $restList;
     return $groups;
 }
-
-/**
- * Include hooks files.
- */
-function includeHooks()
-{
-    $hookFiles = context::current()->getHookFiles();
-    ob_start();
-    foreach($hookFiles as $hookFile)
-    {
-        if(!empty($hookFile) && file_exists($hookFile)) include $hookFile;
-    }
-    $hookCode = ob_get_clean();
-    return html($hookCode);
-}
diff --git a/module/execution/ui/task.html.php b/module/execution/ui/task.html.php
index 2faa6b15c4..f0bbf85db8 100644
--- a/module/execution/ui/task.html.php
+++ b/module/execution/ui/task.html.php
@@ -201,4 +201,4 @@ dtable
     set::createLink($canCreate && common::canModify('execution', $execution) ? $createLink : '')
 );
 
-render();
+$query = query('sidebar')->remove();