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  • JSF2 - use view scope managed bean to pass value between navigation

    - by Fekete Kamosh
    Hi all, I am solving how to pass values from one page to another without making use of session scope managed bean. For most managed beans I would like to have only Request scope. I created a very, very simple calculator example which passes Result object resulting from actions on request bean (CalculatorRequestBean) from 5th phase as initializing value for new instance of request bean initialized in next phase lifecycle. In fact - in production environment we need to pass much more complicated data object which is not as primitive as Result defined below. What is your opinion on this solution which considers both possibilities - we stay on the same view or we navigate to the new one. But in both cases I can get to previous value stored passed using view scoped managed bean. Calculator page: <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html"> <h:head> <title>Calculator</title> </h:head> <h:body> <h:form> <h:panelGrid columns="2"> <h:outputText value="Value to use:"/> <h:inputText value="#{calculatorBeanRequest.valueToAdd}"/> <h:outputText value="Navigate to new view:"/> <h:selectBooleanCheckbox value="#{calculatorBeanRequest.navigateToNewView}"/> <h:commandButton value="Add" action="#{calculatorBeanRequest.add}"/> <h:commandButton value="Subtract" action="#{calculatorBeanRequest.subtract}"/> <h:outputText value="Result:"/> <h:outputText value="#{calculatorBeanRequest.result.value}"/> <h:outputText value="DUMMY" rendered="#{resultBeanView.dummy}"/> </h:panelGrid> </h:form> </h:body> Object to be passed through lifecycle: package cz.test.calculator; import java.io.Serializable; /** * Data object passed among pages. * Lets imagine it holds something much more complicated than primitive int */ public class Result implements Serializable { private int value; public void setValue(int value) { this.value = value; } public int getValue() { return value; } } Request scoped managed bean used on view "calculator.xhtml" package cz.test.calculator; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import javax.faces.bean.ManagedProperty; import javax.faces.bean.RequestScoped; @ManagedBean @RequestScoped public class CalculatorBeanRequest { @ManagedProperty(value="#{resultBeanView}") ResultBeanView resultBeanView; private Result result; private int valueToAdd; /** * Should perform navigation to */ private boolean navigateToNewView; /** Creates a new instance of CalculatorBeanRequest */ public CalculatorBeanRequest() { } @PostConstruct public void init() { // Remember already saved result from view scoped bean result = resultBeanView.getResult(); } // Dependency injections public void setResultBeanView(ResultBeanView resultBeanView) { this.resultBeanView = resultBeanView; } public ResultBeanView getResultBeanView() { return resultBeanView; } // Getters, setter public void setValueToAdd(int valueToAdd) { this.valueToAdd = valueToAdd; } public int getValueToAdd() { return valueToAdd; } public boolean isNavigateToNewView() { return navigateToNewView; } public void setNavigateToNewView(boolean navigateToNewView) { this.navigateToNewView = navigateToNewView; } public Result getResult() { return result; } // Actions public String add() { result.setValue(result.getValue() + valueToAdd); return isNavigateToNewView() ? "calculator" : null; } public String subtract() { result.setValue(result.getValue() - valueToAdd); return isNavigateToNewView() ? "calculator" : null; } } and finally view scoped managed bean to pass Result variable to new page: package cz.test.calculator; import java.io.Serializable; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import javax.faces.bean.ViewScoped; import javax.faces.context.FacesContext; @ManagedBean @ViewScoped public class ResultBeanView implements Serializable { private Result result = new Result(); /** Creates a new instance of ResultBeanView */ public ResultBeanView() { } @PostConstruct public void init() { // Try to find request bean ManagedBeanRequest and reset result value CalculatorBeanRequest calculatorBeanRequest = (CalculatorBeanRequest)FacesContext.getCurrentInstance().getExternalContext().getRequestMap().get("calculatorBeanRequest"); if(calculatorBeanRequest != null) { setResult(calculatorBeanRequest.getResult()); } } /** No need to have public modifier as not used on view * but only in managed bean within the same package */ void setResult(Result result) { this.result = result; } /** No need to have public modifier as not used on view * but only in managed bean within the same package */ Result getResult() { return result; } /** * To be called on page to instantiate ResultBeanView in Render view phase */ public boolean isDummy() { return false; } }

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  • Help passing reference to class subroutine in Perl.

    - by stephenmm
    I am trying to pass a routine to another subroutine within a Perl module. But when I pass the sub reference the passed in ref no longer has the object data. Maybe its not possible to do it this way. The line I have a question about is the "unless" lines below: sub get_flag_end { my $self = shift; return ( -e "$self->{file}" ); } sub wait_for_end { my $self = shift; my $timeout = shift; my $poll_interval = shift; # Is it even possible to pass the oject subroutine and retain the objects data? #unless ( $self->timeout( $timeout, $poll_interval, $self->get_flag_end ) ) { # does not work unless ( $self->timeout( $timeout, $poll_interval, \&get_flag_end ) ) { # call happens but members are empty die "!!!ERROR!!! Timed out while waiting for wait_for_end: timeout=$timeout, poll_interval=$poll_interval \n"; } } sub timeout { my $self = shift; my $timeout = shift; my $poll_interval = shift; my $test_condition = shift; until ($test_condition->() || $timeout <= 0) { $timeout -= $poll_interval; sleep $poll_interval; } return $timeout > 0; # condition was met before timeout } I know that I could change the "get_flag_end" routine to take the value as an argument to the subroutine but what if there was a bunch of stuff done in "get_flag_end" and I needed more members from the object. I simplified the code a bit to make it a little easier to follow.

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  • C# Passing objects and list of objects by reference

    - by David Liddle
    I have a delegate that modifies an object. I pass an object to the delegate from a calling method, however the calling method does not pickup these changes. The same code works if I pass a List as the object. I thought all objects were passed by reference so any modifications would be reflected in the calling method? I can modify my code to pass a ref object to the delegate but am wondering why this is necessary? public class Binder { protected delegate int MyBinder<T>(object reader, T myObject); public void BindIt<T>(object reader, T myObject) { //m_binders is a hashtable of binder objects MyBinder<T> binder = m_binders["test"] as MyBinder<T>; int i = binder(reader, myObject); } } public class MyObjectBinder { public MyObjectBinder() { m_delegates["test"] = new MyBinder<MyObject>(BindMyObject); } private int BindMyObject(object reader, MyObject obj) { //make changes to obj in here } } ///calling method in some other class public void CallingMethod() { MyObject obj = new MyObject(); MyBinder binder = new MyBinder(); binder.BindIt(myReader, obj); //don't worry about myReader //obj should show reflected changes }

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  • Looping through an array and calling a function on each pass in v-basic / asp classic

    - by Sam
    How do I loop through an array and call a function on each pass? At the minute I'm trying the following... if Request.Form("authorize") <> "" then dim post_ids, ids post_ids = Request.form("authorize") ids = split(post_ids, ",") For i = LBound(ids) to UBound(ids) set updater = myFunction("comment_id=" & ids(i)) Next end if I'm getting the following error... Arguments are of the wrong type, are out of acceptable range, or are in conflict with one another.

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  • How To Pass Class As Params to Function

    - by Asim Sajjad
    How can I pass the Parameter to a function. for example public void GridViewColumns(params ClassName[] pinputparamter) { } and Class is as given below public Class ClassName { public string Name{get;set;} public int RecordID{get;set;} } can anyone has idea?

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  • Utility method - Pass a File or String?

    - by James P.
    Here's an example of a utility method: public static Long getFileSize(String fileString) { File file = new File(fileString); if (file == null || !file.isFile()) return null; return file.length(); } Is it a good practise to pass a String rather than a File to a method like this? In general what reasoning should be applied when making utility methods of this style?

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  • iPhone - how to pass an object to a button action

    - by Mike
    I have to pass an object to an button's action... something like [myButton addTarget:self action:@selector(sendIt:MY_OBJECT) forControlEvents:UIControlEventTouchDown]; I cannot set a variable and use that on the method because I am on a static class. How do I do that? thanks for any help.

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  • iPhone - how to pass an object to a button action

    - by Mike
    I have to pass an object to an button's action... something like [myButton addTarget:self action:@selector(sendIt:MY_OBJECT) forControlEvents:UIControlEventTouchDown]; I cannot set a variable and use that on the method because I am on a static class. How do I do that? thanks for any help.

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  • Django-registration and ReCaptcha integration - how to pass the user's IP

    - by knuckfubuck
    New to django and trying to setup django-registration 0.8 with recaptcha-client. I followed the advice posted in the answer to this question. I used the custom form and custom backend from that post and the widget and field from this tutorial. My form is displaying properly with the recaptcha widget but when I submit it throws the error about the missing IP. What's the best way to pass the IP using django-registration?

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  • Pass tenant id via sql server connection

    - by Alexey Zakharov
    Hi guys, I'm building multi tenant application with shared table structure using Microsoft SQL Server. I wonder if it possible to pass tenantID parameter via sql server connection. I don't want to create separate user account for each tenant. Currently I see two ways: via ApplicationName or WorkstationID Best regards, Alexey Zakharov

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  • Pass array to client side for display

    - by Skoder
    Hey, I have an array which contains around 50-200 hyperlinks. How can I pass this array to the client-side so that I can iterate through the array and display each hyperlinks as a list item? The array will be stored in 'Application' as it's system wide and rarely changes. Could there be a more efficient way of achieving the hyperlinks as a list? Thanks

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  • gSOAP: How to pass info inside soap header

    - by Kangkan
    I wish to send some information like authentication token inside SOAP header. I am using gSOAP/c/Linux. Please help me how to pass? My SOAP_ENV__Header looks like /* SOAP Header: */ struct SOAP_ENV__Header { struct ns3__Header *ns3__MyHeader; /* mustUnderstand */ }; and ns3__Header looks like /* ns3:Header */ struct ns3__Header { char *Value; /* optional element of type xsd:string */ };

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  • dialog jquery - pass php output to it, how ?

    - by Kamil Zytkiewicz
    I got this code /* Popup for hot news */ $(document).ready(function() { var $dialog = $('<div></div>') .html('text to be shown') .dialog({ autoOpen: false, title: 'Tablica nowosci' }); This code is in my js files included by header.php. How to pass php output to this function ? Inputing in .html('') above doesnt solve anything. Please help.

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  • How to pass ctor args in Activator.CreateInstance?

    - by thames
    I need a performance enhanced Activator.CreateInstance() and came across this article by Miron Abramson that uses a factory to create the instance in IL and then cache it. (I've included code below from Miron Abramson's site in case it somehow disappears). I'm new to IL Emit code and anything beyond Activator.CreateInstance() for instantiating a class and any help would be much appreciative. My problem is that I need to create an instance of an object that takes a ctor with a parameter. I see there is a way to pass in the Type of the parameter, but is there a way to pass in the value of the ctor parameter as well? If possible, I would like to use a method similar to CreateObjectFactory<T>(params object[] constructorParams) as some objects I want to instantiate may have more than 1 ctor param. // Source: http://mironabramson.com/blog/post/2008/08/Fast-version-of-the-ActivatorCreateInstance-method-using-IL.aspx public static class FastObjectFactory { private static readonly Hashtable creatorCache = Hashtable.Synchronized(new Hashtable()); private readonly static Type coType = typeof(CreateObject); public delegate object CreateObject(); /// /// Create an object that will used as a 'factory' to the specified type T /// public static CreateObject CreateObjectFactory() where T : class { Type t = typeof(T); FastObjectFactory.CreateObject c = creatorCache[t] as FastObjectFactory.CreateObject; if (c == null) { lock (creatorCache.SyncRoot) { c = creatorCache[t] as FastObjectFactory.CreateObject; if (c != null) { return c; } DynamicMethod dynMethod = new DynamicMethod("DM$OBJ_FACTORY_" + t.Name, typeof(object), null, t); ILGenerator ilGen = dynMethod.GetILGenerator(); ilGen.Emit(OpCodes.Newobj, t.GetConstructor(Type.EmptyTypes)); ilGen.Emit(OpCodes.Ret); c = (CreateObject)dynMethod.CreateDelegate(coType); creatorCache.Add(t, c); } } return c; } } Update to Miron's code from commentor on his post 2010-01-11 public static class FastObjectFactory2<T> where T : class, new() { public static Func<T> CreateObject { get; private set; } static FastObjectFactory2() { Type objType = typeof(T); var dynMethod = new DynamicMethod("DM$OBJ_FACTORY_" + objType.Name, objType, null, objType); ILGenerator ilGen = dynMethod.GetILGenerator(); ilGen.Emit(OpCodes.Newobj, objType.GetConstructor(Type.EmptyTypes)); ilGen.Emit(OpCodes.Ret); CreateObject = (Func<T>) dynMethod.CreateDelegate(typeof(Func<T>)); } }

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  • How to pass values between two Custom UITableViewCells in iphone

    - by Mithun
    I have two customized cells in an iphone UITableViewController and would like to capture the data in one cell into another..... I am currently unable to post images and pls assume the following points. There are two custom UITableViewcells 1) Notes Textfield in one customcell 2) Submit button in another text field. Now i want to pass data typed in the notes textfield to be available when I click the Submit button.... Is this possible? Please help....:(

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  • Corect syntax to pass get request parameter value by using EL

    - by Stardust
    I'm trying to pass value by using EL expression in get request parameter, but I'm getting empty value of request parameter whenever I click on that URL. Could anyone please tell me the correct syntax? <c:forEach var="message" items="${requestScope.inboxmessage}" varStatus="messageCount" > <a href="just.do?value="+${messageCount.count} > </c:forEach>

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  • pass Multilple paramets in struts action with same parameter name

    - by raju
    Hi I would like to pass Multiple parameters for single param in action tag. Ex: abc Answers.jsp I have getters and setters for hint (String) variable in my action. Currently i can be able to get parameter value for hint variable as abc if i send one. I would like to send multiple parameters for same variable(hint) ex: abc, xyz how can achieve the above. Thanks in advance Raju

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  • Pass values from MasterPage UserControl to child ASPX Page

    - by Leekey
    Hi, Senario: Masterpage with a UserControl and a child ASPX page In the past when using this senario I've used an Interface as a way to pass a value from the UserControl (embedded in a master page) to the masterpage code behind then consume that value in the child aspx page. My question is now that asp.net 4 have arrived is this still a good way to achieve this or is there another or perhaps better way to do it? I've read somewhere that perhaps "delegates" is perhaps another route to take. Any help much appreciated Lk

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