无法从javascript调用backing bean方法

Question

I try to write javascript code in bean method. I am successful at this in application start.

When I run my application, the js function calls the bean method and return values, however when I click to button it never calls again. I mean, It only calls the bean method while application is starting. My button is:

<p:commandLink oncomplete="myRemote();" title="my button"
               />

My javascript function is:

 function myRemote() {
 ${myBackingBean.actionMyValues()}

 }

My Bean is:

@Controller
@Scope("view")
public class MyBackingBean implements Serializable {


public String actionMyValues() {

    String js="";
    /*getting some values from database and adding it to javascript variables.*/
    js += "alert('alert')";//
    return js;
}
}

Answer 1

If you want to call JS from your backing bean you can use the org.primefaces.context.RequestContext class:

String js="";
/*getting some values from database and adding it to javascript variables.*/
js += "alert('alert')";
RequestContext.getCurrentInstance().execute("js");

EDIT

As it has been suggested in the comments you can also use a p:remoteCommand ( https://www.primefaces.org/showcase/ui/ajax/remoteCommand.xhtml )

The remote command would replace your custom JS function:

<p:commandButton value="My button" type="button" onclick="myRemote()" id="btnRemote" />  

<p:remoteCommand name="myRemote" actionListener="#{myBackingBean.actionMyValues()}"/>   

Then if you need to call JS from your bean you still need to use the RequestContext .