#52 Update through Checkboxes

本文介绍了一种使用复选框选择多个项目并批量标记为已完成的方法。通过Rails中的资源路由定义了一个集合动作来处理批量操作,并展示了如何在视图中创建表单以允许用户选择要标记的任务。
See how to select multiple items using checkboxes and perform an action on the selected items in this episode.
# routes.rb
map.resources :tasks, :collection => { :complete => :put }

# tasks_controller.rb
def complete
Task.update_all(["completed_at=?", Time.now], :id => params[:task_ids])
end

<% form_tag complete_tasks_path, :method => :put do %>
<ul>
<% for task in @incomplete_tasks %>
<li>
<%= check_box_tag "task_ids[]", task.id %>
<%= task.name %>
</li>
<% end %>
</ul>
<%= submit_tag "Mark as Complete" %>
<% end %>
Currently You are now a website builder. These are the code in my cart.php & functions.php. Currently, i am very satisfied with my layout. However, I want to achieve cart like Shopee / Taobao / Lazada, that allow my customer to 1) Do selective checkout, where only selected items are sent to checkout page, and after order created, only these items will be removed from cart. On the other side, non-selected items are retained inside cart, until customer remove them manually through 清除購物車 / 移除選中商品 or customer check out them. Only remove when order is created. If customer go back from checkout page or payment page, or anything, as long as order is not created, dont remove them. Currently im using restore cart way to achieve this, but everything from cart is removed currently after order created. theres some mistake that stop me from achieving this. I turned on feature where customer can see how many items are inside cart through the cart icon at header. At the same time, i dont want my customer to notice that their cart is cleared and recovered before (the amount of items in cart icon will show 0 when havent recover and the number of items after recover). I dont want them to notice the change, therefore, we have to recover it fast until customer did not notice them. Please be considerate regarding customer that use PC because they might access my website through another tab, at there, they can see the amount of items in cart icon. Therefore, i want it to always show the correct amount, only remove when the order is created and maintain if the order is not created. I dont want them to notice how it works (recovering) 2) All these 全选 刪除選中的商品 清空購物車 输入优惠券代码 应用优惠券 已选商品: 0 件,共计: RM0.00 结算 works perfectly fine, please remain them. Maintaining all the layout and achieved functions. Please check which part stopped me from achieving the selective checkout (maintain non-selected items inside cart, only remove selected to checkout items when order created, and dont let customer nmotice the change in their cart. I want them to no matter access from where, either new tab, other device etc, they will see the correct items in their cart) For now, If i cancel the payment halfway, i am logged out when back from payment page, and when i check from other tab, non-selected items are removed from cart, only selected items are still inside cart. Also, when i login back after payment page, it redirects me to pay-only page. Please refer how taobao cart works, and review which part is stopping me from achieve taobao cart, give me the part of code to be changed and the new code to replaced with the current one, as i have no coding basic
08-31
基于径向基函数神经网络RBFNN的自适应滑模控制学习(Matlab代码实现)内容概要:本文介绍了基于径向基函数神经网络(RBFNN)的自适应滑模控制方法,并提供了相应的Matlab代码实现。该方法结合了RBF神经网络的非线性逼近能力和滑模控制的强鲁棒性,用于解决复杂系统的控制问题,尤其适用于存在不确定性和外部干扰的动态系统。文中详细阐述了控制算法的设计思路、RBFNN的结构与权重更新机制、滑模面的构建以及自适应律的推导过程,并通过Matlab仿真验证了所提方法的有效性和稳定性。此外,文档还列举了大量相关的科研方向和技术应用,涵盖智能优化算法、机器学习、电力系统、路径规划等多个领域,展示了该技术的广泛应用前景。; 适合人群:具备一定自动控制理论基础和Matlab编程能力的研究生、科研人员及工程技术人员,特别是从事智能控制、非线性系统控制及相关领域的研究人员; 使用场景及目标:①学习和掌握RBF神经网络与滑模控制相结合的自适应控制策略设计方法;②应用于电机控制、机器人轨迹跟踪、电力电子系统等存在模型不确定性或外界扰动的实际控制系统中,提升控制精度与鲁棒性; 阅读建议:建议读者结合提供的Matlab代码进行仿真实践,深入理解算法实现细节,同时可参考文中提及的相关技术方向拓展研究思路,注重理论分析与仿真验证相结合。
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