Tag: frontend

The backend asks why the frontend numerical precision is lost?

I believe that all front-end partners will inevitably use JavaScript to process numeric related operations in their daily work, such as numeric calculation strong>, Keep specified decimal places, The value returned by the interface is too large, etc. These operations may cause the original normal value to be displayed in JavaScript code> does behave abnormally […]

Upgrade the fruit inventory system using jdbc technology (final version of the backend, not including the frontend)

1. Configuration dependencies <dependencies> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.28</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.2.16</version> </dependency> </dependencies> 2. Fruit entity class package com.csdn.fruit.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; import java.io.Serializable; @Data @NoArgsConstructor @AllArgsConstructor public class Fruit implements Serializable { private Integer fid; private String fname; […]

SpringBoot integrates WebSocket to push information from the backend to the frontend.

Foreword In a project development, the Netty network application framework and MQTT were used to send and receive message data. The background was required to actively push the obtained messages to the front end, so MQTT was used. I will record it here. 1. What is websocket? WebSocket protocol is a new network protocol based […]

WebSocket backend actively invokes the frontend

WebSocket backend actively calls up the frontend Build a maven project pom file dependency Write front-end code illustrate: Build a maven project pom file dependency <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <version>2.3.5.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-websocket</artifactId> <version>2.3.5.RELEASE</version> </dependency> 1 Create a websocket config @Configuration @EnableWebSocket public class WebSocketConfig implements WebSocketConfigurer {<!– –> @Autowired private CustomInterceptor customInterceptor; @Autowired private […]

el-table is lazy loading. The backend passes the entire list with children. How does the frontend handle it by itself?

First of all, you need to pay attention when calling the el-table component in html Insert code snippet here <el-table :data=”tableData” v-loading=”loading” row-key=”id” ref=”table” :lazy=”true” :load=”loads” :tree-props=”{ children: ‘children’, hasChildren: ‘hasChildren’ }” @expand-change=”handleExpandChange” . . . . Secondly, put attributes in data() copyData: [], //Assign copy data maps: new Map(), //Used to store lazy-loaded data […]

How to manage frontend state?

Gathering sand into a tower, making a little progress every day ? Column introduction Front-end Getting Started Tour: Exploring the Wonderful World of Web Development Welcome to the Front-End Getting Started Tour! If you are interested, you can subscribe to this column! This column is tailor-made for those who are interested in web development and […]

frontend-shorts-how-to-create-link-content-previewer-with-react-vue-and-vanilla-javascript-1pm1

Original address: https://dev.to/ilonacodes/frontend-shorts-how-to-create-link-content-previewer-with-react-vue-and-vanilla-javascript-1pm1 Link Content Previewer Not only do I love blogging, I love reading blogs too! Traditionally, when bloggers mention some science-based fact or quote another post, they have to add a link to the source. For the reader, the question is, is it worth stopping to read the post and switching to the […]

The backend can print return data but the frontend and postman display content is empty

//This is the control layer @Controller @RequestMapping(“LagouIndexController”) public class IndexController{ @Autowired IndexService indexService; @RequestMapping(“getAlljob”) @ResponseBody public List<Type1> getAllJob() throws IOException { List<Type1> list = indexService.selectAllType1(); for (Type1 user:list ) { System.out.println(user); } return list; } } //This is the backend print data 2023-09-15 09:34:54 [DEBUG][selectAllType1] – ==> Preparing: SELECT A.tid,A.tname,B.tid2,B.tname2,B.tid,C.jobId,C.jobName ,C.jobLocation,C.tid2,C.jobDescribe,C.companyId FROM ((type1 A LEFT […]

Solidity(6) – Application frontend and Web.js

Chapter 1 Introduction to Web.js The Ethereum network is composed of nodes, and each node contains a copy of the blockchain. When you want to call a method on a smart contract, you need to look up one of the nodes and tell it: Smart contract address the method you want to call What parameters […]