The template cannot capture the contents of the calculated property, but the life cycle hook can record it normally

I'm creating an online store where you can choose to order products without interfering with the contents of your shopping cart. The way I implement it is to share a page for cart items and individual products. It checks if the productID parameter is set and if so, uses different data. This is the f...

P粉604669414 2023-08-30 23:44:38 0  1  557

Navigation bar component does not re-render on state change

I'm trying to create a shopping cart. I created a context and passed the state as value when pressing the increment and decrement buttons on the cart, my item count is changing but when I use the same context in the navigation bar component, in the cart The total number of items will not change. I h...

P粉037880905 2023-09-07 12:01:10 0  1  480

How PHP interfaces actually change the behavior of classes

According to the PHP documentation, object interfaces allow you to create code that specifies which methods a class must implement without defining how those methods are implemented. So, the interface is like a class with predefined methods, which still need to be accessed using -> notation. Howe...

P粉289775043 2023-09-02 23:49:28 0  1  626

Importance of Ajax add to cart button with custom fields on single product page

I'm trying to edit the "Add to Cart" button for a single product page. Successfully added a custom ajax call using LoicTheAztec's solution. The code runs just fine. However, I need to change $product_id in the solution's code to the product's custom field value, which is "custom_id&qu...

P粉959676410 2023-09-01 16:28:19 0  1  541

php - How to add methods to an instance?

{Code...} If there is already an instance of class A, how can this instance also use the test method? What should I do if class A cannot be modified in php and python? If possible, use other packages when writing php before. , you will encounter that the call result returned is already an instance o...

某草草 2017-06-29 10:07:59 0  2  834

How to autowire an interface in Comparator class

Using springboot and mongo's repository, I defined a Comparator class and wanted to implement my own object comparison method. The code is as follows: {Code...} However, in this case, storyRepository is null. How should we deal with this? Thanks

大家讲道理 2017-06-28 09:24:59 0  1  961

thinkphp5.1 annotation plug-in

Thinkphp5.1 uses annotations to implement: data validator selection acquisition, formatted parameter attribute object automatic injection automatic transaction use: ArticleController controller <?php namespace app\index\controller; use app\index\validate\Article\SaveValidate; use app\common\mod...

只是没有如果 2020-01-11 16:07:51 0  0  1310

After cross-class call, method cannot be found

Do static method overloading to achieve chained access to the database exercise demo5.php references the Query.php class and then accesses the method in Query. The page prompts me that the method 'table' is not found in the Database. The following is the source code. I hope it can help. The first er...

方人胥 2021-06-12 17:16:18 1  2  890

Can PHP achieve serial port real-time communication? Ask for detailed methods

Can PHP achieve serial port real-time communication? I have found many, many examples on the Internet. They are all writers. The code does not work at all, or it is mainly for LINUX. Is there anyone who has done similar projects who has detailed solutions and pointers? Thank you very much!

phpcn_u5220 2017-06-19 00:51:34 0  2  1226

Ways to fix issue 2003 (HY000): Unable to connect to MySQL server 'db_mysql:3306' (111)

I recently tried to containerize my FastAPIPython server (also for replication/doubling purposes). Before, I had just a MySQL server in a Docker container and everything was fine, but when I also made my web server a service, it couldn't connect to the MySQL server, so now the application doesn't wo...

P粉178132828 2023-09-05 11:18:47 0  1  830

Experiment with sorting after query limit

So this is my first question here, please forgive me if something is wrong. I'm trying to make a sort query based on constraints. So there is a Customers table with 90 records. I want to first perform a query limited to 3 records, and then sort the results of this query by a column called ContactNam...

P粉237125700 2023-09-05 14:46:42 0  1  730

CSS Grid: Create new row when child content overflows column width

I have a two column layout based on CSS grid. When the content of the second column exceeds 1fr I want to create a new row. As it currently stands, the content simply overflows the column. One requirement of this layout is that the items in the right menu column are in one row. I achieve this with: ...

P粉212114661 2023-09-05 15:18:28 0  1  619

PHP full text search functionality using AND, OR and NOT operators

Newbie question: I'm trying to implement a full text search on a search string using php and eloquent. $searchstring="+(victimsuspect)+crime-covid";$searchresult=RssItem::whereRaw("MATCH(description)AGAINST('$searchstring'INBOOLEANMODE)")->ge

P粉076987386 2023-09-05 15:06:32 0  1  581

Shortest way to convert all PHP types to string

I'm writing a general system that I hope can one day be applied to fields like medicine (i.e. it's "scientific"). I think the best way is to represent all the data in php with strings (true will be "true", false will be "false" and so on). The reason for this is that in...

P粉369196603 2023-09-05 15:34:44 0  1  1009

How to get average of DATETIME column in MySQL while grouping by other columns

I'm creating and populating a MySQL table using the following query: SETtime_zone='+00:00';CREATETABLEtimestamp_n_datetime(idINT,timeDATETIME,avg_timeDATETIME);INSERTINTOtimestamp_n_datetime(id,time,avg_time)VALUES("1","2023-01-0310:

P粉460377540 2023-09-05 11:46:21 0  1  508

Multi-device (mobile phone) synchronization - React Native

I'm trying to create a Lightshow that will launch on all users' mobile devices at the same time (can have up to 2000-3000 users). All users will use the Internet (Wi-Fi or mobile data). In our FE we use Apollo for subscriptions and it works like a charm. But the problem is, user A can get subscribed...

P粉151466081 2023-09-05 11:58:38 0  1  701

Spades, Diamonds, Hearts, Clubs => styles do not change font color in Chrome for Android

In Google Chrome on Windows, the card suit symbols (spades, hearts, diamonds, clubs) are colored correctly using the "style" attribute. Unfortunately, the same page displayed in Google Chrome on Android does not display the colors I defined but uses the default black and red. (See the atta...

P粉896751037 2023-09-05 15:25:13 0  1  762

How to hide mui TextField label?

I'm developing a Nextjs app and I have a dashboard navigation bar built with mui that contains a notification that opens the notification box, which is built with regular HTML and CSS. dashboard-navbar.js: importNotificationBoxfrom"./notification-box/notification-box";//...exportconstDashb...

P粉239164234 2023-09-05 15:41:00 0  1  690