components - Primefaces 3.0 到 3.1 迁移-6ren

components - Primefaces 3.0 到 3.1 迁移

转载作者：行者123 更新时间：2023-12-02 18:08:14

我尝试从 3.0 迁移到 3.1 primefaces，但在第一页上出现错误。

我正在测试与 jar-3.0.RC2.jar primefaces 完美配合的代码，并尝试更改 primefaces-3.1.RC1.jar。

感谢您的帮助。

服务器:JBOSS 6 Final。

代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:p="http://primefaces.org/ui"
    xmlns:oc="http://java.sun.com/jsf/composite/components">

<h:head>
    <title>#{msgs.pt_login}
    </title>
     <link rel="stylesheet" type="text/css"
        href="#{request.contextPath}/css/base.css"/>
</h:head>
<h:body styleClass="login">

        <h:form>
            <p:selectOneMenu value="#{selectLanguageController.localizacion}" style="position:absolute;right: 0px">
                    <f:selectItems value="#{selectLanguageController.localizacionesMap}" />
                    <p:ajax event="change" process="@this" update="centerContainer"
                        listener="#{selectLanguageController.cambiarLocalizacion}"/>
            </p:selectOneMenu>
            <oc:themeSwitcher/>
        </h:form>
        <h:panelGrid id="centerContainer" style="margin-top: 25%;margin-left: auto;margin-right: auto;">
            <h:form id="frmMain">
                <p:panel style="width:100%;">
                <p:focus context="frmMain"/>  
                <p:messages id="messages"/>
                    <f:facet name="header">#{msgs.pt_login}</f:facet>
                    <h:panelGrid id="loginFrm" columns="2" cellpadding="5">                 
                        <h:outputText value="#{msgs.lbl_usuario}"/>
                        <p:inputText id="txt_user" value="${sessionController.alias}"/>
                        <h:outputText value="#{msgs.lbl_password}"/>
                        <p:keyboard id="txt_password" value="#{sessionController.contrasena}"  
                        showMode="button" buttonImageOnly="true"  
                        buttonImage="/images/keyboardpencil.png"  
                        password="true"/>
                    </h:panelGrid>
                    <p:commandButton action="#{sessionController.login}" value="${msgs.btn_login}" style="margin-left: auto;margin-right: auto;" ajax="false"/>
                </p:panel>
            </h:form>
        </h:panelGrid>
</h:body>
</html>

而jboss抛出的错误如下:

17:06:20,450 INFO  [STDOUT] 
17:06:20,450 INFO  [STDOUT]  >   >   >>   >>   >>>    >>>
17:06:20,450 INFO  [STDOUT] ****  Procesando una nueva Peticion   ****
17:06:20,450 INFO  [STDOUT]    Antes de la fase--> RESTORE_VIEW 1
17:06:20,468 INFO  [STDOUT]    Despues de la fase--> RESTORE_VIEW 1--Vista /login.xhtml
17:06:20,469 INFO  [STDOUT]    Antes de la fase--> RENDER_RESPONSE 6
17:06:20,606 GRAVE [javax.enterprise.resource.webcontainer.jsf.application] Error Rendering View[/login.xhtml]: javax.faces.FacesException: Cannot find component with identifier "centerContainer" in view.
    at org.primefaces.util.ComponentUtils.findClientIds(ComponentUtils.java:249) [:]
    at org.primefaces.component.behavior.ajax.AjaxBehaviorRenderer.getScript(AjaxBehaviorRenderer.java:72) [:]
    at javax.faces.component.behavior.ClientBehaviorBase.getScript(ClientBehaviorBase.java:99) [:2.0.3-]
    at org.primefaces.renderkit.CoreRenderer.encodeClientBehaviors(CoreRenderer.java:332) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeScript(SelectOneMenuRenderer.java:258) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:63) [:]
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650) [:2.0.3-]
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:164) [:2.0.3-]
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389) [:2.0.3-]
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127) [:2.0.3-]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117) [:2.0.3-]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) [:2.0.3-]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135) [:2.0.3-]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309) [:2.0.3-]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:734) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:541) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:479) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:407) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677) [:6.0.0.Final]
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.0.0.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.0.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.0.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [:6.0.0.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.0.0.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.0.0.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.0.0.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.0.0.Final]
    at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]

17:06:20,617 INFO  [STDOUT]    Despues de la fase--> RENDER_RESPONSE 6--Vista /login.xhtml
17:06:20,617 INFO  [STDOUT] ******Peticion Procesada!!****
17:06:20,618 INFO  [STDOUT] <<<  <<<   <<    <<     <
17:06:20,618 INFO  [STDOUT] 
17:06:20,618 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/OpenCEO].[Faces Servlet]] El Servlet.service() para servlet Faces Servlet lanzó una excepción: javax.faces.FacesException: Cannot find component with identifier "centerContainer" in view.
    at org.primefaces.util.ComponentUtils.findClientIds(ComponentUtils.java:249) [:]
    at org.primefaces.component.behavior.ajax.AjaxBehaviorRenderer.getScript(AjaxBehaviorRenderer.java:72) [:]
    at javax.faces.component.behavior.ClientBehaviorBase.getScript(ClientBehaviorBase.java:99) [:2.0.3-]
    at org.primefaces.renderkit.CoreRenderer.encodeClientBehaviors(CoreRenderer.java:332) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeScript(SelectOneMenuRenderer.java:258) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:63) [:]
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650) [:2.0.3-]
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:164) [:2.0.3-]
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389) [:2.0.3-]
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127) [:2.0.3-]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117) [:2.0.3-]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) [:2.0.3-]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135) [:2.0.3-]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309) [:2.0.3-]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:734) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:541) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:479) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:407) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677) [:6.0.0.Final]
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.0.0.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.0.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.0.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [:6.0.0.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.0.0.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.0.0.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.0.0.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.0.0.Final]
    at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]

17:06:20,622 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/OpenCEO].[jsp]] Servlet.service() para servlet jsp lanzó excepción: javax.faces.FacesException: Cannot find component with identifier "centerContainer" in view.
    at org.primefaces.util.ComponentUtils.findClientIds(ComponentUtils.java:249) [:]
    at org.primefaces.component.behavior.ajax.AjaxBehaviorRenderer.getScript(AjaxBehaviorRenderer.java:72) [:]
    at javax.faces.component.behavior.ClientBehaviorBase.getScript(ClientBehaviorBase.java:99) [:2.0.3-]
    at org.primefaces.renderkit.CoreRenderer.encodeClientBehaviors(CoreRenderer.java:332) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeScript(SelectOneMenuRenderer.java:258) [:]
    at org.primefaces.component.selectonemenu.SelectOneMenuRenderer.encodeEnd(SelectOneMenuRenderer.java:63) [:]
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:879) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1650) [:2.0.3-]
    at javax.faces.render.Renderer.encodeChildren(Renderer.java:164) [:2.0.3-]
    at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:849) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1643) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1646) [:2.0.3-]
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:389) [:2.0.3-]
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:127) [:2.0.3-]
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:117) [:2.0.3-]
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:97) [:2.0.3-]
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:135) [:2.0.3-]
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:309) [:2.0.3-]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:734) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:541) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:479) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:407) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.doForward(PageContextImpl.java:706) [:6.0.0.Final]
    at org.apache.jasper.runtime.PageContextImpl.forward(PageContextImpl.java:677) [:6.0.0.Final]
    at org.apache.jsp.index_jsp._jspService(index_jsp.java:63)
    at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:369) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:326) [:6.0.0.Final]
    at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:253) [:6.0.0.Final]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [:1.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:324) [:6.0.0.Final]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:242) [:6.0.0.Final]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [:6.0.0.Final]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:181) [:6.0.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.event(CatalinaContext.java:285) [:1.1.0.Final]
    at org.jboss.modcluster.catalina.CatalinaContext$RequestListenerValve.invoke(CatalinaContext.java:261) [:1.1.0.Final]
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:88) [:6.0.0.Final]
    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:100) [:6.0.0.Final]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) [:6.0.0.Final]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158) [:6.0.0.Final]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [:6.0.0.Final]
    at org.jboss.web.tomcat.service.request.ActiveRequestResponseCacheValve.invoke(ActiveRequestResponseCacheValve.java:53) [:6.0.0.Final]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [:6.0.0.Final]
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:654) [:6.0.0.Final]
    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:951) [:6.0.0.Final]
    at java.lang.Thread.run(Thread.java:662) [:1.6.0_26]

最佳答案

您遇到的问题与从 3.0 到 3.1 所做的重大更改有关。在 3.0 早期，任何缺失的组件和 id 都会显示为警告，但现在它们会显示为异常。为了摆脱这种情况，您必须为每个表单提供一个“id”。例如替换“h:form”

与h:form id="form1"

当使用update="centerContainer"时，使用update=":form1:centerContainer"。

希望这会有所帮助。

关于components - Primefaces 3.0 到 3.1 迁移，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/9120932/

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我最近开始使用 JSX 元素语法而不是调用函数，因为它使代码更漂亮。但看起来又不太一样。令人惊讶的是，因为在 App.js 中，函数调用会导致无限循环(并引发错误)，但 JSX 元素可以工作。在 Da
javascript - Vue : components inside component
通过少量渲染来构建嵌套组件系统的好方法是什么？请参阅下面带有主要问题(“如何...”)的所需代码: tab.vue(子组件) export default {
components - 将对象建模为 "collections of components"的游戏引擎在运行时如何工作？
我正在编写一个轻量级游戏引擎，并且在为它做一些研究的同时，我遇到了许多令人信服的文章，它们提倡通过“组件集合”模型而不是“从具体类继承”模型来实现游戏对象。有很多优点: 可以使用数据组合对象驱动设计
src/app/reactive-form/reactive-form.component.html:47:48 - error TS2531: Object is possibly 'null'. src/app/reactive-form/reactive-form.component.ts(Src/app/reactive-form/reactive-form.component.html:47:48-错误TS2531：对象可能为‘Null’。Src/app/reactive-form/reactive-form.component.ts)
类型‘AbstractControl’上不存在属性‘Controls’。
reactjs - react : Is any descendant component a child component?
考虑以下示例: function Travel(props) { return ( ) } function Welcom
reactjs - 扩展 React.Component 与 Component
我刚刚加入了一个 React Native 项目，在那里我经常看到扩展 React.Component 和 Component 本身的类。示例: 类 SomeView 扩展了 React.Compo
javascript - React.Component 和 Component 有什么区别？
我见过两种访问 Component 的方法: import React from 'react'; class Foo extends React.Component { ... } 和 im
java - 我可以扩展 @Component 并创建另一个 @Component 类并一次只提供一个吗？
我有一个库 jar，我想将其提供给许多应用程序。我想要的行为是在库中创建一个通用的 spring 组件类。如果在应用程序中，没有扩展相同的组件，则使用公共(public)组件；如果它在应用程序中扩展，
java - Component.setBounds 调用 Component.repaint？
所以我正在制作一个游戏，我有 EnemyAI 以及 player，它们都扩展了 JPanel。世界有一个 null 布局，所以我正在使用 setBounds(); 来“移动”(我实际上只是移动世界图像
css - Styled-components:插值函数或 component.extend？
在 styled-component 中，您如何决定是应该使用插值函数来修改组件(通过传递 props )还是扩展现有组件。例如: const Button = styled.button`
java - h : component and a4j:components? 之间的差异
我搜索并获取了以下信息。请添加您的信息 h:commandbutton 与 a4j:commandButton 相同，唯一的区别是 a4j:commandButton 有额外的 ajax 请求。 a
javascript - Angular 5 循环依赖 : Component in Component
我目前在一个项目中，我们有一个动态“表单”/内容模型，其中我们有一个包含字段和占位符的模块，占位符可以包含更多模块，为我们提供递归/灵活的数据模型. 现在为了渲染这个，我们创建了一个组件来渲染模块，动
javascript - react : How to setState in child component from parent component?
我是 React 的新手，正在尝试设置一个 Bootstrap 模式来显示警报消息。在我的父 App.js 文件中，我有一个错误处理程序，它向 Modal.js 组件发送一个触发模态显示的 Prop
Angular 2+ : Component style keeps affecting other components
通过 background-color:red 获得主页组件写入其 scss，然后使用 background-color:green 获取用户组件写入它的 scss。我启动我的应用程序，我在家，背景是
svelte - 如何调用 svelte :component current component method?
我有这个基本的应用程序，其中一些组件具有公共(public) load 方法。对于某些操作，我想在当前 svelte:component 上调用该方法，但我不知道如何获取对组件实例的引用。如何做到这一

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components - Primefaces 3.0 到 3.1 迁移