问题
Is there a way to ajax-update a specific component such as a <h:form> in backing bean?
I tried the following using RequestContext#execute(),
RequestContext context = RequestContext.getCurrentInstance();
context.execute("monitorVehicleForm.update()");
however that didn't seem to have any effect.
回答1:
The RequestContext#execute() only executes arbitrary JavaScript code which is been passed-in as argument. It does not ajax-update the client representation of the components.
You need RequestContext#update() instead wherein you just pass the client ID of the to-be-updated component.
context.update("monitorVehicleForm");
This has exactly the same effect as <p:commandXxx ... update="monitorVehicleForm">. This works provided you've a
<h:form id="monitorVehicleForm">
without any NamingContainer parent and thus have a
<form id="monitorVehicleForm" name="monitorVehicleForm" ...>
in the generated HTML.
See also:
- How to find out client ID of component for ajax update/render? Cannot find component with expression "foo" referenced from "bar"
来源：https://stackoverflow.com/questions/16101392/how-to-programmatically-ajax-update-specific-component-in-backing-bean