当发生验证错误后提交对话框：存放p [英] Keep p:dialog up when a validation error occurs after submit

问题描述

小例子对话框：

<p:dialog header="Test Dialog"  
          widgetVar="testDialog"> 
  <h:form> 
    <p:inputText value="#{mbean.someValue}"/> 

    <p:commandButton value="Save" 
                     onsuccess="testDialog.hide()" 
                     actionListener="#{mbean.saveMethod}"/> 
  </h:form>       
</p:dialog> 

我希望能够做的是有mbean.saveMethod莫名其妙prevent该对话框关闭，如果有一些问题，只能输出通过咆哮的消息。这是一种情况，即验证器也无济于事，因为没有办法判断，直到保存提交到后端服务器someValue中是有效的。目前，我这样做是使用可视属性，并将其指向一个布尔字段中的MBean。这一工程，但它使用户界面慢，因为突然出现向上或向下的对话框需要击中服务器。

What I want to be able to do is have the mbean.saveMethod somehow prevent the dialog from closing if there was some problem and only output a message through growl. This is a case where a validator won't help because there's no way to tell if someValue is valid until a save is submitted to a back end server. Currently I do this using the visible attribute and point it to a boolean field in mbean. That works but it makes the user interface slower because popping up or down the dialog requires hitting the server.

推荐答案

您可以删除的onSuccess 和PrimeFaces'代替它的RequestContext＃执行（）：

You could remove the onsuccess and replace it by PrimeFaces' RequestContext#execute():

<p:commandButton value="Save" 
    actionListener="#{mbean.saveMethod}" /> 

这个里面 saveMethod（）：

if (success) {
    RequestContext.getCurrentInstance().execute("testDialog.hide()");
}

如果您preFER不凌乱与视图特定的脚本控制器，可以作为选择可以考虑使用的onComplete ，而不是它提供了一个 ARGS 对象，它有一个布尔 validationFailed 属性：

If you prefer to not clutter the controller with view-specific scripts, you could alternatively also consider using oncomplete instead which offers an args object which has a boolean validationFailed property:

<p:commandButton value="Save"
    actionListener="#{mbean.saveMethod}"
    oncomplete="if (args &amp;&amp; !args.validationFailed) testDialog.hide()" />

（即如果（参数）检查是必要的，因为它可能不存在已经发生Ajax错误的时候，因此，当您试图造成一种新的JS错误GET validationFailed 从它; ＆放大器;放大器; 而不是＆安培; 是强制性的<一的原因解释href="http://stackoverflow.com/questions/16303779/the-entity-name-must-immediately-follow-the-in-the-entity-reference/16328808#16328808">this回答，重构如有需要，您调用像的onComplete =hideDialogOnSuccess（参数，testDialog））的

(the if (args) check is necessary because it may be absent when an ajax error has occurred and thus cause a new JS error when you try to get validationFailed from it; the & instead of & is mandatory for the reason explained in this answer, refactor if necessary to a JS function which you invoke like oncomplete="hideDialogOnSuccess(args, testDialog)")

这是不幸的PrimeFaces不支持什么样的RichFaces已经支持：请求时EL在上*复评属性。否则你将也能够做到这这一点：

It's unfortunate that PrimeFaces does not support what RichFaces already supports: request-time re-evaluation of EL in on* attributes. You would otherwise also be able to do just this:

<p:commandButton value="Save"
    actionListener="#{mbean.saveMethod}"
    oncomplete="if (#{not facesContext.validationFailed}) testDialog.hide()" /> 

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