从javascript中获取托管bean的返回值 [英] Get the returned value from managed bean in javascript

问题描述

在我的应用程序中，我调用一个Javascript事件，该事件调用 p：remoteCommand 名为 checkPageLayoutsAreSelected ，如下所示：

In my application I call a Javascript event which calls a p:remoteCommand named checkPageLayoutsAreSelected as following :

$('selector').on('click', function (e) {
  checkPageLayoutsAreSelected();
});

这是 p：remoteCommand ：

<p:remoteCommand name="checkPageLayoutsAreSelected" actionListener="#{beanFormDashboard.checkPageLayoutsAreSelected}" />

此 p：remoteCommand 将调用方法在 beanFormDashboard 托管bean中，它将返回一个布尔值：

This p:remoteCommand will call a method in the beanFormDashboard managed bean which will return a Boolean value :

public Boolean checkPageLayoutsAreSelected(){
    for(DashboardPage dp : dashboardPageList){
        if(dp.getModel() == 0){
            return false;
        }
    }
    return true;
}

所以我想通过获取返回值来自Javascript代码中托管bean的checkPageLayoutsAreSelected（）。

这样的事情：

$('selector').on('click', function (e) {
  var returnedValue = checkPageLayoutsAreSelected();
});

我该怎么做？

推荐答案

checkPageLayoutsAreSelected 不会返回值甚至是promise，但您可以Ajaxicaly返回值。

checkPageLayoutsAreSelected doesn't return a value or even a promise but you can Ajaxicaly return value.

<p:remoteCommand name="checkPageLayoutsAreSelected"
     action="#{beanFormDashboard.checkPageLayoutsAreSelected()}"
     oncomplete="getLayoutAreSelectedResult(xhr, status, args);"
/>

在方法 checkPageLayoutsAreSelected（）你使用PF提供的RequestContext将结果发送回客户端：

And in the method checkPageLayoutsAreSelected() you use RequestContext provided by PF to send result back to client:

public void checkPageLayoutsAreSelected() {
   Boolean result=true;
   for(DashboardPage dp : dashboardPageList){
        if(dp.getModel() == 0){
            result= false;
        }
   }
   RequestContext reqCtx = RequestContext.getCurrentInstance();        
   reqCtx.addCallbackParam("returnedValue", result);
}

在Javascript回调函数中 getLayoutAreSelectedResult（xhr， status，args）你将得到返回值：

And in the Javascript callback function getLayoutAreSelectedResult(xhr, status, args) you will have the returned value:

$('selector').on('click', function (e) {
    checkPageLayoutsAreSelected();
    window.getLayoutAreSelectedResult= function(xhr, status, args) {
       var returnedValue = args.returnedValue;
       console.log(returnedValue);
    }
});

这篇关于从javascript中获取托管bean的返回值的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！