Execute managebean method from javascript onload event
How can I make an ajax request that updates a <h:dataTabl开发者_如何学Goe> from javascript? I am currently loading the initial data using @Postconstruct but that is significantly delaying the initial page load.
I am thinking about using onload event of <body> HTML tag to fire the request and update the datatable.
In theory the following should do it.
<h:body>
<f:ajax event="load" listener="#{bean.onload}" />
</h:body>
with
public void onload(AjaxBehaviourEvent event) {
// ...
}
However, this is not supported for some reason. I've ever posted an issue report about that.
The following works, but it's in essence a hack.
<h:head>
<title>JSF 2.0 onload hack</title>
<script>
window.onload = function() {
document.getElementById('hidden:link').onclick();
}
</script>
</h:head>
<h:body>
<h:form id="hidden" style="display:none">
<h:commandLink id="link">
<f:ajax event="click" listener="#{bean.onload}" />
</h:commandLink>
</h:form>
</h:body>
If you happen to use PrimeFaces, then you can use its <p:remoteCommand> with autoRun set to true.
<h:body>
<h:form>
<p:remoteCommand name="onload" action="#{bean.onload}" autoRun="true" />
</h:form>
</h:body>
Or if you're using OmniFaces, then you can use its <o:commandScript>
<h:body>
<h:form>
<o:commandScript name="onload" action="#{bean.onload}" />
<h:outputScript target="body">onload()</h:outputScript>
</h:form>
</h:body>
The <h:outputScript target="body"> renders the <script> in the end of the <body>. The upcoming OmniFaces 2.2 will remove this need by new autorun attribute.
<h:body>
<h:form>
<o:commandScript name="onload" action="#{bean.onload}" autorun="true" />
</h:form>
</h:body>
in jsf2.0 you can use the f:ajax tag in almost any other jsf tag e.g
<h:selectOneRadio id="myComponent" value="#{someBean.inputMethod}">
<f:selectItem itemValue="#{someBean.A}" itemLabel="A" />
<f:selectItem itemValue="#{someBean.B}" itemLabel="B" />
<f:ajax event="click" action=#{someBean.someMethod} />
</h:selectOneRadio>
In this example the someMethod is excuted in the javasript onClick event for the "myComponent" selectOneRadio
Not sure if this is what you are after ....
I solved it by using the Metadata-Functions, as I could not use @PostContruct (FacesMessages are enqueued and not displayed when thrown in postconstruct mehtod... see last comment)
<f:metadata>
<f:viewAction action="#{bean.initProducts}" />
</f:metadata>
<h:body>
<ui:composition template="/templates/commonTemplate.xhtml">
<ui:define name="body">
<h:panelGroup>
<h:dataTable id="table"
value="#{bean.getProducts}" var="product"
<!-- Table Stuff-->
</h:dataTable>
</h:panelGroup>
</ui:define>
</ui:composition>
I am very new to JSF so ... I DO NOT know very much about JSF's lifecycle phases, but this solution worked for me.
加载中,请稍侯......
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