[iPhone] - Add command to a navigation controller back button?

I have a root navigation controller with a table view going to a normal view controller. The normal view controller plays a sound but I am wanting the sound to stop when the back button is pressed to go back to the root view. Currently, the sound will continue playing until it ends. Where do I put the code to stop the sound when the back button is pressed?
Thanks!

You could place it in the UIViewController delegate method - (void) viewWillDisappear:(BOOL)animated.

Similar Messages

Navigation controller back button

Hi i have a viewcontoller a) controlling a view with an nstimer.
I want to suspend the timer if i switch to another viewcontroller b)
which is fine, but i want to resume the timer when pressing the back button
on the navigation controller.
How do i either know when this button is pressed, or how do i know when my viewcontroller a) is active again.
Please help me out folks.....

troutfly wrote:
or how do i know when my viewcontroller a) is active again.
viewWillAppear
For the button solution, you would need to create your own.

Navigation problem (back button)

Hi all,
I'm new to jsf and I'm having a problem with navigation.
There are two pages one for the header information and one for the details, a button permit to add a row of details.
What I need is to place e "back" button to allow to return to header pages.
The problem is that all the fields in the detail page are mandatory so if I put a normal command button it makes a check on the fileds and throws an error (field must not be blank) .
Which type of Componet should I have to use ?
Thanks to all for the response

Maybe u can try to put immediate="true" in the back command button

How to set a back button to the caller page

Hello,
An application have a page that can be called by several other pages, for instance, an "addContact.faces" can be called by several other forms, when the user adds the contact or press a back button, the application should go back to the caller page.
How can I implent this?
Thanks in advance,
Juan

As an alternative, you could Ajax the stuff and put it in a popup div, which is a common technique nowadays. Then the user doesn't even navigate away from the page he/she was on, plus it is relatively easy to implement in a generic way so multiple pages can use it.
Search for "css popup div" on google if you want to see this in action.

IPhone Navigation Controller Problem

I started working on learning how to use the iPhone UINavigationController in my app, and so far I have a UIViewController subclass that I can create multiple instances of with a view from a .xib file and push onto the navigation controller stack. Everything works, including the back button, but the first pushed view controller doesn't have a back button, so once I push one view on, the first view is inaccessible. Every view controller from the third one on has the back button. Any idea why?

Well, I finally solved it. Turns out I needed to give the root UIViewController a title, and all the back buttons appeared fine, with the "invisible" one gaining the title of the root controller. Interesting how the others appeared - I guess creating a UIViewController programatically without a title gives the back button pointing to it a default title of "Back".

How to add a ViewController to a Navigation Controller?

How to add a ViewController to a Navigation Controller, if it contains a TableView as root?
I'm trying to add a UIViewController (AddProjectViewController) to a Navigation Controller (navigationController), which has a Tableview set as root, and it does not work.
This is how I have the files setup: http://d.pr/y8rt
The code is in ProjectsController.m - please help

Hi Andrei, and welcome to the Dev Forum!
andreipotorac wrote:
I'm trying to add a UIViewController (AddProjectViewController) to a Navigation Controller (navigationController), which has a Tableview set as root, and it does not work.
You didn't say what user action should bring up the next controller. But for example, if you want an instance of AddProjectViewController to be pushed onto the nav controller's stack when the user selects a row in the table, something like this should work:
// ProjectsController.m
#import "ProjectsController.h"
#import "AddProjectViewController.h"
@implementation ProjectsController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
AddProjectViewController *nextController = [[AddProjectViewController alloc]
initWithNibName:@"AddProjectViewController" bundle:nil];
// Pass selected object info to the new view controller here. E.g.:
// Project *project = [projectsArray objectAtIndex: [indexPath row]];
// nextController.projectTitle.text = project.projectTitle;
[self.navigationController pushViewController:nextController animated:YES];
[nextController release];
- Ray

[iPhone] Invisible Navigation Back button item?

I'm a little perplexed on this one. I've started a project based off the Navigation Controller template in Xcode, which is table based, and I push a view controller onto the stack, it shows up just fine.
The problem is, after this new view is pushed, there's no Back button in the navigation Bar. Well, not visible at least. If I click on the navigation bar on the left side, where the Back button should be, it goes Back! But I can't figure out why it's not showing.
There's a property like self.navigationItem.hidesBackItem or something like that, but setting it to NO had no effects.
Anyone?

Aha!
You nailed it. Problem solved. And I guess that makes sense, the Back button I guess is derived from the title of the previous view (seems to me though it should have some default value like "Back").
Thanks so much
JB

[iphone] Remove back button from navigation bar

I have an app set up with a navigation controller which is working fine. What I'd like to do is remove the back button when certain views come up. In fact I can't seem to manipulate the back button at all. I tried putting self.navigationItem.backBarButtonItem.title = @"TestTitle"; in the view controller for one of the views in the app, and the title doesn't change. Mainly I would like to remove the back button. Anyone have an idea? This is on beta 6.
Thanks.
Message was edited by: Lysandus

Each view controller that is being managed by your UINavigationController has a property called navigationItem. You should do something like this in the managed viewController:
self.navigationItem.hidesBackButton = YES;
hope that helps

IPhone Dev: Tab Bar Controller with nested Navigation Controller

I want to have a tab bar with 2 views. The first view is a navigational one. I know the view can be loaded in from an external nib and I can set the first view to a navigation controller.
My question is: can this navigation controller in the external nib instead? Ideally I want to separate it out so the tab bar loads in the external nib (that has the navigation controller). Is this possible? or the only approach is to simply have to set the view controller to a navigation controller?

Hey, this writing an app that uses the Tab View Controller in conjunction with Navigation View Controllers is driving me bats. I took a sample program which worked well, added a nib file for a basic view that only had a label on it then:
* I created a view controller class to work with it.
* I added code to add create a navigation controller.
* Added my new view controller to the navigation controller
* added this nav controller to the array with the other stuff for the tab view controller.
* RUN
Everything seems to work as far as all the existing stuff. And the title for my new "tab" shows up on the More tab.
But when I click on it (in the simulator) the program crashes. It could be how I set up the nib file I made is wrong.
I posted the code on my web site. Here is the URL:
http://chomer.com/iphonesample_code/05a_-_Brightness_ToolbarSwatches.zip
Please have a look. Its probably something small and stupid that I missed.
Regards,
Orville

[iphone beta 6] rotating with a navigation controller

ok... this started happening in beta 6.
i have a navigation controller. when i rotate the device to landscape, the view that it is on only gets half the screen vertically, when i rotate it back to portrait, the view only gets half horizontally.
i have had many problems with rotating the device in the past, so it is likely that one of my workarounds i implemented then has not come back to bite me.
manually setting the top view's frame with:
navController.topViewController.view.frame = [self getScreenRect];
does nothing
any ideas?
john
Message was edited by: johne-dm

just some debugging ideas.
skip the nav controller and just have that top controller as the current view controller. see if you get the same behavior. then you know that it's not the nav controller.
check the autoresizemask property of the top view controller's view. it should be set to expand vertically/horizontally as necessary.
something that's helped me in the past is to set different backgroundColors for all view controller views.

Multi layer table view/navigation controller hierarchy best practice

Hi,
I am new to iPad/iPhone development and wondering what the best practice for multiple layers of table views is? I understand the principle of a navigation controller providing the framework for moving up and down a list but have not yet quite got my head around if you should have one navigation controller for the whole tree or several navigation controllers.
In my app I need to have the following:
Main view -> window view showing some interactive elements (picker, buttons etc.)
Setup view -> Hierarchy managed by nav controller/table views
The setup view needs to manage the following hierarchy...
- Level A:
- Global app variables (one table view)
- Level B Items (table view showing list of items at belonging to Level B)
- Level B Item 1 (table view showing list of items at level C belonging to level B item 1)
- Level C Item 1 (table view showing list of items at level D belonging to level C item 1)
- Level D Item 1 (table view showing list of items at level E belonging to level D item 1)
- Level E item (table view for properties of item at Level E)
- Level D Item n
- Level C Item n
- Level B Item n
Each level in this has some properties and then a list of child items.
What would be the best way of structuring this? I would assume that creating a class that extends a view controller for each level is a given but what about the control of the navigation? Should this be handled by one navigation controller or one per level? I think I know the right answer but have not seen a neat way of implementing
I think I am also best off having each level in it's own xib but, once again, am not 100% sure that this is the best design pattern.
Many thanks in advance for any help/pointers!
Cheers
jez

Hi Julian,
I have struggled with the same questions you are addressing. On a previous project we tried to model based on packages, but during the course of the project we encountered some problems that grew overtime. The main problems were:
1. It is hard to enforce rules on package assignments
2. With multiple developers on the project and limited time we didn't have time to review package assignment
3. Devopelers would click away warnings that an object was already part of another project and just continue
4. After go-live the maintenance partner didn't care.
So, my experience is is that it is a nice feature, but only from a high level design point of view. In real life it will get messy and above all, it doesn't add much value to the development. On my neew assignment we are just working with packages based on functional area and that works just fine.
Roy

Problem with Back button in Top Level Navigation

Hi all,
We are facing a minor problem with the Back button in the Top Level Navigation in Portal. This button is present under the Roles and Worksets menu along with the History, Forward, and Add to Portal Favorites links.
The problem is faced when we have some worksets under a single role. While browsing accross these worksets by randomly clicking on them, we wish to use the Back button as well to go back to the previous workset. But when we use the Back button, the Detailed Navigation panel in the last workset is not retrieved.
I will explain with the System Administration Role. I open the worksets under this role in the following manner:
First I open Transport;
Next I open Portal Display;
Next I open System Configuration;
Now I wish to go back to Portal Display workset by clicking on the Back button. But when I do this, although the Portal Display workset opens up, but I cannot see the Detailed Navigation Panel. See the screenshot below:
http://img399.imageshack.us/my.php?image=backbuttonkg6.jpg
Please help me in solving this issue.
Regards,
Ankur

I think I have found a resolution, although not very pleasant:
[Note 950426 - Portal Back button not working correctly|https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/oss_notes/sdn_oss_ep_pi/~form/handler%7b5f4150503d3030323030363832353030303030303031393732265f4556454e543d444953504c4159265f4e4e554d3d393530343236%7d]
Regards,
Ankur

In IPhone Apps crash when press back buton . When press back back button Last class is appeared slightly slighly ash, with no error or warning .

Hi,
I am developing apps on for 4.1 and on Xcode3.2. My Apps crash when press back buton . When press back back button Last class is appeared slightly than crash, with no error or warning ....Here are the code....crash on Back Funtion
#import "TransactionSummaryDetailViewController.h"
#import "TransactionSummaryData.h"
#import "Constant.h"
#import "DataBase.h";
#import "Common.h"
#import "YPCardHolderServiceService.h"
#import "SelectionScreenViewController.h"
@implementation TransactionSummaryDetailViewController
@synthesize table,cardReference;
@synthesize waitIndicator,transactionsummary,keyArray,valueArray,isSummaryAvailable;
@synthesize startDate,endDate;
// The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
    if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) {
        // Custom initialization
    return self;
-(void)getrowcount{
    if(transactionsummary.cardholdernmae !=nil){
        [keyArray addObject:@"Card Holder Name: "];
        [valueArray addObject:transactionsummary.cardholdernmae];
    if(transactionsummary.cardnumber!=nil){
        [keyArray addObject:@"Card Number: "];
        [valueArray addObject:transactionsummary.cardnumber];
    if(transactionsummary.debittransactioncount != nil){
        [keyArray addObject:@"Debit Tx. Count: "];
        [valueArray addObject:transactionsummary.debittransactioncount];
    if(transactionsummary.debittransactionvalue!=nil){
        [keyArray addObject:@"Debit Tx. Value"];
        [valueArray addObject:transactionsummary.debittransactionvalue];
    if(transactionsummary.credittransactioncount!=nil){
        [keyArray addObject:@"Credit Tx. Count: "];
        [valueArray addObject:transactionsummary.credittransactioncount];
    if(transactionsummary.credittransactionvalue!=nil){
        [keyArray addObject:@"Credit Tx. Value: "];
        [valueArray addObject:transactionsummary.credittransactionvalue];
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad {
    appDelegate = [[UIApplication sharedApplication]delegate];
    keyArray = [[NSMutableArray alloc]init];
    valueArray = [[NSMutableArray alloc]init];
    [self getrowcount];
    NSLog(@"Key Array Count is %d",[keyArray count]);
    [table setBackgroundColor:[UIColor clearColor]];
    [table setSeparatorColor:TableViewCellSeperatorColor];
    [waitIndicator setHidden:YES];
    [self setTitle:@"Summary Details"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    [button setImage:[UIImage imageNamed:@"list.png"] forState:UIControlStateNormal];
    [button addTarget:self action:@selector(BacktoView) forControlEvents:UIControlEventTouchUpInside];
    [button setFrame:CGRectMake(0, 0, 76, 44)];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
    if(!isSummaryAvailable)
        if([Common isNetworkAvailable])
            [waitIndicator startAnimating];
            YPCardHolderServiceService *services = [[YPCardHolderServiceService alloc] init];
            YPTransactionsSummaryRequest *summaryRequest = [[YPTransactionsSummaryRequest alloc] init];
            summaryRequest.SC = appDelegate.SC;
            summaryRequest.userName = appDelegate.userName;
            summaryRequest.valid =TRUE;
            summaryRequest.cardReference =[NSString stringWithFormat:@"%@",cardReference];
            NSLog(@"Start Date Is %@ and End Date is %@",startDate,endDate);
            summaryRequest.startDate = startDate;
            summaryRequest.endDate = endDate;
            summaryRequest.applicationType = @"M";
            [services getTransactionsSummary:self action:@selector(getTransactionsSummaryHandlers:) transactionsSummaryRequest:summaryRequest];
            [summaryRequest release];
            [services release];
    [super viewDidLoad];
//Handle the Response of getTransactionsSummary
-(void)getTransactionsSummaryHandlers:(id) value
    [waitIndicator stopAnimating];
    // Handle errors
    if([value isKindOfClass:[NSError class]]) {
        NSLog(@"%@", value);
        return;
    // Handle faults
    if([value isKindOfClass:[SoapFault class]]) {
        NSLog(@"%@", value);
        return;
    // Do something with the YPLoginResponse* result
    YPTransactionsSummaryResponse* result = (YPTransactionsSummaryResponse*)value;
    if(result.statusCode == 0)
        NSLog(@"Number of Transaction is =%d",[result.transactionSummaryList count]);
        NSLog(@"Step 1 ='%@'",appDelegate.userID);
        NSString *deleteQuery = @"delete from TransactionSummary where userid = ";
        NSLog(@"Step 1 ='%@'",appDelegate.userID);
        deleteQuery = [deleteQuery stringByAppendingString:[NSString stringWithFormat:@"%@ and cardreference = '%@'",appDelegate.userID,cardReference]];
        NSLog(@"delete query= '%@'",deleteQuery);
        [DataBase deleteDataFromTable:deleteQuery];
        NSLog(@"delete query= '%@'",deleteQuery);
        //for (int i =0; i< [result.transactionSummaryList count]; i++)
        for (int i =0; i< [result.transactionSummaryList count] -2; i++)
            NSLog(@"for loop= %d",i);
            YPTransactionSummaryDetails *transactionSummary = (YPTransactionSummaryDetails*)[result.transactionSummaryList objectAtIndex:i];
            NSLog(@"cardholdername= '%@'",transactionSummary.cardholderName);
            /*NSString *insertQuery = @"Insert into TransactionSummary(cardholdername,cardnumber,debittransactioncount,debittransac tionvalue,credittransactioncount,credittransactionvalue,userid) values(";
            insertQuery =[insertQuery stringByAppendingString:[NSString stringWithFormat:@"'%@','xxxx xxxx xxxx %@',%d,%d,%d,%d,'%@',%@)",
                                                               transactionSummary.cardholderName,transactionSummary.cardNumber,transactionSumm ary.debitTransactionCount,
                                                               transactionSummary.debitTransactionValue,transactionSummary.creditTransactionCo unt,transactionSummary.creditTransactionValue,
                                                               appDelegate.userID]];*/
            //Add by sarvesh
            NSString *insertQuery = @"Insert into TransactionSummary(cardholdername,cardnumber,debittransactioncount,debittransac tionvalue,credittransactioncount,credittransactionvalue,cardreference,userid) values(";
            insertQuery =[insertQuery stringByAppendingString:[NSString stringWithFormat:@"'%@','%@',%d,%d,%d,%d,'%@',%@)",
                                                               transactionSummary.cardholderName,transactionSummary.cardNumber,transactionSumm ary.debitTransactionCount,
                                                               transactionSummary.debitTransactionValue,transactionSummary.creditTransactionCo unt,transactionSummary.creditTransactionValue,cardReference,
                                                               appDelegate.userID]];
            NSLog(@"Insert Query for Transaction Summary is %@",insertQuery);
            [DataBase InsertIntoTable:insertQuery];
        //Read Update Data From DataBase and Refresh Table
            NSString *query = @"Select * from TransactionSummary where userid = ";
            query = [query stringByAppendingString:[NSString stringWithFormat:@"%@ and cardreference = '%@'",appDelegate.userID,cardReference]];
        NSLog(@"select query= %@",query);
            NSMutableArray *temp=[DataBase getTransactionSummaryTableData:query];
            if([temp count] > 0)
                transactionsummary = (TransactionSummaryData*)[temp objectAtIndex:0];
                [keyArray removeAllObjects];
                [valueArray removeAllObjects];
            [self getrowcount];
            [table reloadData];
-(void)viewDidAppear:(BOOL)animated
    CGFloat navBarHeight = 50.0f;
    CGRect frame = CGRectMake(0.0f, 20.0f, 320.0f, navBarHeight);
    [self.navigationController.navigationBar setFrame:frame];
    [super viewDidAppear:animated];
-(IBAction)BacktoView
    NSLog(@"in back function..TrasactionSummaryDetail");
    SelectionScreenViewController *screenView=[[SelectionScreenViewController alloc] initWithNibName:@"SelectionScreenViewController" bundle:nil];
    [self.navigationController popViewControllerAnimated:YES];
    [screenView release];
- (UITableViewCellEditingStyle)tableView:(UITableView *)tableView editingStyleForRowAtIndexPath:(NSIndexPath *)indexPath{
    return UITableViewCellEditingStyleNone;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
    return cellHeightForGroupedTable;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if(section == 0)
        return [keyArray count];
    else
        return 0;
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    NSString *title = nil;
    switch (section){
        case 0:{
            //title = @"Summary Details";
            break;
    return title;
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    if ([self tableView:tableView titleForHeaderInSection:section] != nil) {
        return tableHeaderHeight;
    else {
        // If no section header title, no section header needed
        return 0;
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
    NSString *sectionTitle = [self tableView:tableView titleForHeaderInSection:section];
    if (sectionTitle == nil) {
        return nil;
    // Create label with section title
    UILabel *label = [[[UILabel alloc] init] autorelease];
    label.frame = CGRectMake(20, 6, 300, 30);
    label.backgroundColor = [UIColor clearColor];
    label.textColor = HeaderTextColor;
    label.shadowColor = HeaderTextShadowColor;
    label.shadowOffset = CGSizeMake(0.0, 1.0);
    label.font = HeaderTextFontSize;
    label.text = sectionTitle;
    // Create header view and add label as a subview
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320,60)];
    [view autorelease];
    [view addSubview:label];
    return view;
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = nil;
    NSString *cellIdentifier;
    cellIdentifier = @"SectionsTableIdentifier";
    int row = [indexPath row];
    CGRect nameLabelRect = CGRectMake(19 , 8, 240, 29);
    CGRect cardlabelRect = CGRectMake(19,31,240,15);
    UILabel *nameLabel = [[UILabel alloc] initWithFrame:nameLabelRect];
    UILabel *cardnumber = [[UILabel alloc] initWithFrame:cardlabelRect];
    cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if(cell == nil){
        cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:cellIdentifier] autorelease];
    // Remove all subview from cell content view
    for (UIView *view in cell.contentView.subviews){
        [view removeFromSuperview];
     [cell setAccessoryType:UITableViewCellAccessoryNone];
    [nameLabel setTextColor:firstLabelFontColor];
    [nameLabel setFont:firstLabelFont];
    [nameLabel setFont:firstLabelFontSize];
     nameLabel.textAlignment = UITextAlignmentLeft;
     nameLabel.text = [NSString stringWithFormat:@"%@ : %@",[keyArray objectAtIndex:row],[valueArray objectAtIndex:row]];
     [cell.contentView addSubview: nameLabel];
     cell.selectionStyle = UITableViewCellSelectionStyleNone;
    [cell setBackgroundColor:[UIColor clearColor]];
    [cell setBackgroundColor:TableViewCellColor];
    [nameLabel setBackgroundColor:[UIColor clearColor]];
    [cardnumber setBackgroundColor:[UIColor clearColor]];
    [cardnumber release];
    [nameLabel release];
    return cell;
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceO rientation {
    // Return YES for supported orientations
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
- (void)didReceiveMemoryWarning {
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
- (void)viewDidUnload {
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
- (void)dealloc {
    [table release];
    [waitIndicator release];
    [keyArray release];
    [valueArray release];
    [transactionsummary release];
    [super dealloc];
@end

This is the user-to-user tech support site. For carrier issues go to the Dev forums.
You might want to note that the current iOS is 4.3.3, and the current SDK is 4.3 and XCode 4.0.2

Excel data source and the use of add command

HI, Looking for suggestions on how to work with multiple inputs that cannot be joined directly. Here's the background.
The Report currently reads in two different Ecel files and uses 3 SQL commands to query an Oracle Database. I need to join the 5 data sources and am having issues with the 2 excel files. In one file I need to be able to derive a field based on another column in the file In order to create the join condition to the SQL commands. I'd equate this to a case statement in SQL, but how goes one do that using the 'add command' feature? What is the syntax?
Next I would need to join (left outer) the two excel files using two fields from file A (a1, a2) and 3 fields from file B (b1,b2,b3), where a1=b1 and b2 <= a2 <= b3 when rows from A exist in B. If row A does not exist in B then we still want it in the report and available to left outer join to the 3 oractab data sources.
runtime is also a concern.
Any Suggestions?

hi Elena,
in this case the use of subreports is not recommended. that's because you're exporting to excel and you need data in columns across the report. subreports will not, unfortunately, give you what you need.
this would bring you back to joining the datasources. what i would recommend is looking into using 'oracle database link' to link your oracle db to excel files. here's one article as an example but you may be able to find a better one. if you have questions on this please ask them on an oracle forum as the syntax that you need will be database specific.
a lot of databases have this type of technology which allows you to create a view to other data. sql server has 'linked servers', sap hana has 'smart data access'. essentially you are creating a non-materialized view to the external data. then this view is available on the main oracle server where you established this connection. this should be a lot easier than trying to bring a bunch of command objects together off independent datasources inside of crystal.
-jamie

UIX Controller - using the browser back button

I'd like to understand more about the controller and what is going on behind the scenes when I hit the back button. It would appear that some form of page caching is taking place and I want to know if I can effectively get a refreshed version of a page (although in some cases it might be just some elements of a page). My application scenario is this:-
Having done a search, I select a row from a results table and add it to a short list (similar to shopping cart) which is then displayed. My search results page i.e. the previous page has a link to the shortlist with its text attribute databound to a string generated when items are added to the shortlist '3 items shortlisted'. When I hit the back button I get the state of the page before I added my item to the shortlist so the description is wrong. Hitting the browser refresh button displays the correct link text. Anyway I can force this behaviour? Is this what I should be trying to do or is there some best practice technique that I can use? There are several instances where I want to do this sort of thing.
Hope that makes sense
Thanks
Ian

Hi,
In the Struts Framework, I have found code in the controller servlet, like this:
* Render the HTTP headers to defeat browser caching if requested.
* @param response The servlet response we are creating
* @exception IOException if an input/output error occurs
* @exception ServletException if a servlet exception occurs
protected void processNoCache(HttpServletResponse response)
          throws IOException, ServletException
          if (!nocache)
          return;
          response.setHeader("Pragma", "No-cache");
          response.setHeader("Cache-Control", "no-cache");
          response.setDateHeader("Expires", 1);
nocache is a boolean that gets initialized from a parameter specified in the web.xml!
multiple header fields for all different web browsers.
(how to set these header fields in JSP, over to someone else)
I can not remember if, when the user uses the Back button to return to a page with these header fields, he gets a 'Page Expires' message, or if the browser will automagically refresh the page.
(It might even be so that for example IE5 will refresh, and that IE6 will give the message)
Luc

[iPhone] - Add command to a navigation controller back button?

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