reactive | 易学教程

Difference between @Controller and RouterFunction in Spring 5 WebFlux

阅读更多关于 Difference between @Controller and RouterFunction in Spring 5 WebFlux

问题 There are two ways to expose HTTP endpoints in spring 5 now. @Controller or @RestController by making the controller's class, e.g. @RestController @RequestMapping("persons") public class PersonController { @Autowired private PersonRepo repo; @GetMapping("/{id}") public Mono<Person> personById(@PathVariable String id){ retrun repo.findById(id); } } Route in @Configuration class by using RouterFunctions: @Bean public RouterFunction<ServerResponse> personRoute(PersonRepo repo) { return route(GET

angular6 中怎样创建响应式表单？

阅读更多关于 angular6 中怎样创建响应式表单？

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 在angular中，提供了两种创建表单的方式：模板驱动型表单（Template Driven Forms）响应式表单（Reactive Forms）在模板驱动型表单中，我们直接通过 ngModel 指令在组件模板中创建 control 和绑定数据，不用创建控件、表单对象或编写代码来处理组件类和模板之间的数据交流;并且，我们不会把表单验证写在组件类中。在响应式表单中，我们在组件类中创建表单对象，并将其绑定到模板中的响应式表单控件中。所有的表单控件和数据验证都写在组件类中；表单验证和表单状态变化是异步的，我们可以在组件类写代码中观察到这一点。响应式表单通常用于数据模型确定的情形。那么这两种创建表单的方式主要区别在哪里呢？在响应式表单中，我们不需要用到ngModel,required等指令，我们在组件类中创建所有的控件和验证器。它很容易测试和维护。接下来，我将通过FormControl/FormGroup/FormBuilder/FormArray和添加一些表单验证功能来创建一个响应式表单。 step1: 添加响应式表单模块：Reactive Forms Module import {ReactiveFormsModule} from '@angular/forms'; import {

除了servlet 多一种选择 webflux

阅读更多关于除了servlet 多一种选择 webflux

【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> Webflux快速入门　　SpringWebflux是SpringFramework5.0添加的新功能，WebFlux本身追随当下最火的Reactive Programming而诞生的框架，那么本篇就来简述一下这个框架到底是做什么的一、关于WebFlux 　　我们知道传统的Web框架，比如说：struts2，springmvc等都是基于Servlet API与Servlet容器基础之上运行的，在Servlet3.1之后才有了异步非阻塞的支持。而WebFlux是一个典型非阻塞异步的框架，它的核心是基于Reactor的相关API实现的。相对于传统的web框架来说，它可以运行在诸如Netty，Undertow及支持Servlet3.1的容器上，因此它的运行环境的可选择行要比传统web框架多的多。　　根据官方的说法，webflux主要在如下两方面体现出独有的优势：　　1）非阻塞式　　　　其实在servlet3.1提供了非阻塞的API，WebFlux提供了一种比其更完美的解决方案。使用非阻塞的方式可以利用较小的线程或硬件资源来处理并发进而提高其可伸缩性　　2) 函数式编程端点　　　　老生常谈的编程方式了，Spring5必须让你使用java8，那么函数式编程就是java8重要的特点之一

How to use reactiveValues() in order to store changes in a shiny app

阅读更多关于 How to use reactiveValues() in order to store changes in a shiny app

问题 I have a simple shiny app in which I use a numericInput() to set the number of the rows of the dataframe.Then I use a selectInput() "Label" to select a Label from the datatable and then change its name with textInput() "Change to". The problem is that every time I try to change the name of a new Label using the textInput() the previous Label that I modified returns to default name. I believe this is happening because my DF is created inside a reactive function and cannot accept the subsetting

Change Leaflet Map Dynamically based on Multiple Reactive expressions

阅读更多关于 Change Leaflet Map Dynamically based on Multiple Reactive expressions

问题 In the example Data Frame DF , I have the following columns. gender <- c("Male", "Female","Female", "Male") Location <- c("AB", "BC", "CD", "DE") hasTV <- c("Yes","Yes","No","No") Latitude <- c(49.82380908513249,59.478568831926395,59.478568831926395,49.82380908513249) Longitude <- c(-10.8544921875,-10.8544921875,2.021484375,2.021484375) DF <- data.frame(gender,Location,hasTV,Latitude,Longitude) Under UI, i've used radiobuttons to select options from hasTV, checkboxGroupInput to select Gender

How to make a reactive shiny map with a spatial polygons data frame

阅读更多关于 How to make a reactive shiny map with a spatial polygons data frame

问题 I want to create a reactive shiny world map with r using a spatial polygons data frame. The idea is to have a slider with different years, which can be moved and is used as an input for coloring the countries. My problem is in making the data reactive, when I run the code that is attached below the slider input values are taken (e.g for all the countries the value is 2004) and the error message "Warning in pal(input$year) : Some values were outside the color scale and will be treated as NA"

Add more choices into Microservice Reactive Blueprint

阅读更多关于 Add more choices into Microservice Reactive Blueprint

问题 when I create one reactive microservice, I need to add another database choise (like cassandra) but I can't customize blueprint for this specific question (I see only MongoDb right now) How can I do it? Any suggestion? 回答1: The experimental Reactive option only has support for MongoDB at this time (v5.3.1). You can track the progress in the related issue, "Reactive/Webflux support" 来源： https://stackoverflow.com/questions/52230223/add-more-choices-into-microservice-reactive-blueprint

Shiny assign reactive variable from input using loop

阅读更多关于 Shiny assign reactive variable from input using loop

问题 I'm trying to assign reactive variable based on my input using loop. For example, I want to select the column (from input) in iris data set. Then get the unique value from that column. And I want to do this in the loop. I find it works for my 'joke' variable, but not for my 'Group[[paste0('Gcol',i)]]' variable. I've been searching answer for this for days. Thank you for your help in advance! library(shiny) data=iris ui <- fluidPage( titlePanel("Old Faithful Geyser Data"), sidebarLayout(

Reuse individual Angular 5 reactive form elements

阅读更多关于 Reuse individual Angular 5 reactive form elements

问题 I am still learning Angular 5 and have started working with the "reactive" form model. However, almost every example and tutorial I can find has you creating the entire form in one template. Normally in AngularJS 1.x, we would store each field in its own directive and then wire them together to create a form to cut down on duplication. Is there a way to do this with Angular 5 reactive forms using only one file and having the template and all validations included? I can see how to do it in two

Angular Reactive Form why valueChanges is called before input listener

阅读更多关于 Angular Reactive Form why valueChanges is called before input listener

问题 what's the order of events in case I have a reactive form and some directives with hosteListener on keyup, keydown, keypress, input, etc? I'm creating a reactive form with an input text and a directive that take the input and uppercase it: @HostListener('input') onInput() { if (this.uppercase) { this.el.nativeElement.value = this.el.nativeElement.value.toUpperCase(); } } But the method valueChanges of the form is called before the directive, so the value in the model is still lowercase.

订阅 reactive