How do I save values between page navigation in windows phone,
suppose I have two text blocks in my one phone application page, and they contains dynamically changing values every time, now suppose my text block have value "abc" and for some reason I go back to previous page, now when I get back on my page, I want that text block having value "abc". How to do it??
There are several methods available
IsolatedStorageSettings
Save
IsolatedStorageSettings settings = IsolatedStorageSettings.ApplicationSettings;
// txtInput is a TextBox defined in XAML.
if (!settings.Contains("userData"))
{
settings.Add("userData", txtInput.Text);
}
else
{
settings["userData"] = txtInput.Text;
}
settings.Save();
Read
if (IsolatedStorageSettings.ApplicationSettings.Contains("userData"))
{
txtDisplay.Text +=
IsolatedStorageSettings.ApplicationSettings["userData"] as string;
}
PhoneApplicationService.Current.State
PhoneApplicationService.Current.State["param"] = param
and on other page we can get it like this.
var k = PhoneApplicationService.Current.State["param"];
Define two static variable in your App.xaml.cs
public static valueOne = string.Empty;
public static valueTwo = string.empty;
//Assign textbox value to variable on page leaving event
protected override void OnNavigatingFrom(System.Windows.Navigation.NavigatingCancelEventArgs e)
{
if(!string.IsNullOrEmpty(txtBoxOne.Text))
App.valueOne = txtBoxOne.Text;
if(!string.IsNullOrEmpty(txtBoxTwo.Text))
App.valueTwo = txtBoxTwo.text;
}
//Get value from page load
protected override void OnNavigatedTo(NavigationEventArgs e)
{
if(!string.IsNullOrEmpty(App.valueOne))
string valueFirst = App.valueOne;
if(!string.IsNullOrEmpty(App.valueTwo ))
string valueTwo = App.valueTwo ;
}
There are various approaches to solve this.
Common thing is using a Static Class, which holds static properties and binding it to your View.
Related
I have problems with my dialog field. I have button that opens dialog tab with field. It was supposed to show on that field lookup exact records(i guess i need select there by one field value). Right now i have this code:
DialogField Journal = dialog.addField(extendedTypeStr(JournalId));
This dialog line adds a field with all values on that EDT. I have 3 journal types - NEW, UPDATE, DELETE. Right now on that field lookup it shows me all 3 journal types. I want to make custom lookup that shows exact type , example - if i click that button on journal that has type "NEW", then it should show only "NEW" type of journal types on lookup. I heard there is something like dialog.addLookup or something. Can someone help me?
You already added your dialog field (in the dialog() method). Now add the dialogRunPost() method that is executed after the form GUI is initialized. At that point you can fetch the underlying FormStringControl behind the dialog field. Subscribing to the FormStringControl.OnLookup event allows you to override the lookup.
I did not have some journal data available, so I created a similar example with customers. My example dialog (MyDialog) takes a source customer (customerCaller) and shows a dialog with a custom lookup that only shows customers with the same customer group.
My example is also a standalone, runnable class and is not called from a form. Comments have been added to indicate where this affects the code.
Full example
public class MyDialog extends Runbase
{
// fields
protected Args args;
protected CustTable customerCaller;
protected DialogField dfCustomerId;
// construct
public static MyDialog newArgs(Args _args)
{
MyDialog ret = new MyDialog();
ret.args = _args;
return ret;
}
// initialize
public boolean init()
{
boolean ret = super();
// validate and fetch caller
if (args.record() && args.record().TableId == tableNum(CustTable))
//if (args.caller() && args.caller().dataset() == tableNum(CustTable)) --> when called from form
{
customerCaller = args.record();
//customerCaller = args.caller().record();
}
else
{
throw error(Error::missingRecord('My Dialog'));
}
return ret;
}
// build dialog
public Object dialog()
{
Dialog ret = super();
// optional reference to visualize the input
ret.addText('Caller customer group = ' + customerCaller.CustGroup);
// add field
dfCustomerId = ret.addField(extendedTypeStr(CustAccount)); // default lookup = all CustTable.AccountNum values
return ret;
}
public void dialogPostRun(DialogRunbase dialog)
{
super(dialog);
// subscribe to lookup event
FormStringControl fscCustomerId = dfCustomerId.control();
fscCustomerId .OnLookup += eventhandler(this.customerId_OnLookup);
}
// custom lookup for customer id
protected void customerId_OnLookup(FormControl _sender, FormControlEventArgs _e)
{
// cancel default
FormControlCancelableSuperEventArgs eventArgs = _e;
eventArgs.CancelSuperCall();
// define lookup query (list all customers with same customer group as input customer)
Query query = new Query();
QueryBuildDataSource qbds = SysQuery::findOrCreateDataSource(query, tableNum(CustTable));
SysQuery::findOrCreateRange(qbds, fieldNum(CustTable, CustGroup)).value(SysQuery::value(customerCaller.CustGroup));
// do lookup
SysTableLookup lookup = SysTableLookup::newParameters(tableNum(CustTable), _sender);
lookup.parmQuery(query);
lookup.addLookupfield(fieldNum(CustTable, AccountNum), true);
lookup.addLookupfield(fieldNum(CustTable, CustGroup));
lookup.performFormLookup();
}
// run dialog
public static void main(Args _args)
{
// I am running this dialog directly (not from a form), generating some random input
CustTable customer;
select firstonly customer where customer.CustGroup != '';
_args.record(customer);
// end of random input
MyDialog md = MyDialog::newArgs(_args);
md.init();
if (md.prompt())
{
md.run();
}
}
}
Result
I have an objectlistview with 4 columns and a dynamic number of rows, I'm struggling with programmable editing a cell text value, and optionally change the forecolor
I've read everything and anything that I could put my hands on, but couldn't find any valid and right to the point example on how to do it.
the ObjectListView is created this why
List<VideoItem> list = new List<VideoItem>();
foreach (dynamic item in VideoItems)
{
list.Add(new VideoItem { Index = (int)item.index, OldName = (string)item.oldname, NewName = (string)item.newname });
}
olv1.AddObjects(list);
VideoItem class look like this
private class VideoItem
{
public int Index;
public string OldName;
public string NewName;
}
but i need to programmably edit a cell text on event. I'm doing some logical operations on other cell at the end im storing the result to to cell next to it.
You should be storing the result (making the change) to the underlying model object and then call RefreshObject(myModelObject);
About the forcolor, i need to change only the cell I've changed
"To change the formatting of an individual cell, you need to set UseCellFormatEvents to true and then listen for FormatCell events."
Take a look at this.
Just to add to Rev1.0 Answer, i needed to update the object that contains the items (in my case a List) then, use olv1.RefreshObject(list); flow by olv1.BuildList(true);
the olv1.BuildList(true); refresh the GUI immediately.
here a small code snippet to make thing bit more clear
it's changing the data in column 3 when a checkbox is checked.
using System.Collections.Generic;
using System.Windows.Forms;
namespace Test
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
Initializeolv();
}
private class VideoItem
{
public int Index;
public string OldName;
public string NewName;
}
private List<VideoItem> list = new List<VideoItem>();
private void Initializeolv()
{
for (var i = 1; i <= 10; i++)
{
list.Add(new VideoItem { Index = i, OldName = $"old{i}", NewName = $"new{i}" });
}
olv1.AddObjects(list);
}
private void olv1_ItemChecked(object sender, ItemCheckedEventArgs e)
{
list[e.Item.Index].NewName = "new200";
olv1.RefreshObject(list);
olv1.BuildList(true);
}
}
}
I need a custom binding and I know when and where but I don't know how I can do it. This is the relation of the view in my custom binding. Think about the *Views like controls.
I have the connections from ViewModel->ContainerView->FirstView but I can't connect it with the TableView. To connect the ContainerView to FirstView I did a custom binding (in one direction for now). And in the setvalue method I call the firstview's method SetBinding (where I want to do the binding)
I tried a few option but nothing happens, the last one looks like this:
public GolferList CurrentGolferList { get; set; }
public void SetBinding(GolferList golferList){
this.CurrentGolferList = golferList;
TableSource = new TableSourcePlayers(TableViewPlayers);
var bindingDescription = new[]{
new MvxBindingDescription {TargetName = "ItemsSource",SourcePropertyPath = "CurrentGolferList"} ,
};
Binder.Bind(this,TableSource, bindingDescription);
TableViewPlayers.Source = TableSource;
TableViewPlayers.ReloadData();
}
I would be grateful if you could tell me another way to handle it.
Update:
I followed Stuart's link and now it works fine, thanks a lot Stuart!
Actually, in my scheme the TableView is a MvxSimpleBindableTableViewSource and I want to bind the data there. So in order to make it work, I used the code below (SetBinding needs some external refactor):
private List<IMvxUpdateableBinding> bindings;
private string BindingText = "{'ItemsSource':{'Path':'CurrentGolfers'}}";
public object DataContext {
get { return dataContext; }
set { dataContext = value;
if (bindings == null)
bindings = this.GetService<IMvxBinder>().Bind(dataContext, TableSource, BindingText).ToList();
else
bindings.ForEach(b => b.DataContext = dataContext);
}
}
public void SetBinding(GolferList golferList){
this.DataContext = PlayViewModel;
tableView.Source = TableSource;
tableView.ReloadData();
}
Note that BindingText points to the table, not to the view itself.
Update 2
Now in V3 it's a bit different. First, the view must implement IMvxBindable and this members:
public object DataContext
{
get { return BindingContext.DataContext; }
set { BindingContext.DataContext = value; }
}
public IMvxBindingContext BindingContext { get; set; }
(Don't forget dispose calling BindingContext.ClearAllBindings() and also call to CreateBindingContext() in the viewload )
And then you'll be able to bind in your class. In my case:
var set = this.CreateBindingSet<FirstPlayViewController, PlayViewModel>();
set.Bind(source).To(vm => vm.CurrentGolfers).Apply(); //I love the new fluent api :)
I think what you want to do is actual a data-bound View, rather than a custom binding.
This is covered in this question - Custom bindable control in a MvvmCross Touch project
Basically what you need to do is to add a collection of 'Bindings' and the 'DataContext' property to your FirstView.
If you do that then you should be able to databind (to DataContext) within FirstView just like you do within any normal MvvmCross view.
Note - this will be much easier to do in v3 as we've added a 'BindingContext' object to assist with exactly this type of operation
Just trying to do some quick and dirty testing. I am passing fake data through my controller to a view just to see how the UI looks.
In my controller which I set up just to "test" this I have, for example:
MyViewModel = new MyViewModel
{
MyModel= new Models.MyModel
{
FirstName = "Homer", //This works
SomeDecimal = 10000, //This works
SomeRadioButton = Models.MyModel.Enum.Selection, //This works
SomeCheckBox = Models.MyModel.OtherEnum.OtherSelection, //This doesn't
}
}
I am getting the Cannot implicitly convert type ... to 'System.Collections.Generic.List<string>' error.
My radio buttons and check boxes share similar convention for using enums, but the checkbox uses public List<string> SomeCheckBox { get; set; } whereas radio buttons use public Enum? SomeRadioButton { get; set; }
Please note, I am not using a testing framework. I am just trying to figure out quickly how to pass some fake data to see how the UI is shaping up. Can anyone share a sample of how to accomplish what I want (to pass a checkbox value so my UI can show data that would have been selected by a user)?
The other problem I forsee is in passing more than one selection from the checkbox, but once I get the code down I think I should be able to figure that out.
Thanks.
Your error message makes total sense. Try this
var testViewModel = new TestViewModel
{
SomeCheckBox = new List<string> {TestViewModel.RadioButtonValues.Value1.ToString() }
};
While writing code for connecting two webparts,I created a two labels. the text value for both the labels were written in OnPreRender method. However, i forgot to add control for one label in CreateChildControl method.
So while debugging, i noticed that, after post back, the label whose control i forgot to add didn't retain the value and it was showing empty string.But the other label who's control i added was able to retain the value.
protected override void CreateChildControls()
{
base.CreateChildControls();
btnup.Text = " Update";
this.Controls.Add(lblid);//**If i add this, the label retains the value during post back , otherwise its null**
this.Controls.Add(lblname);
this.Controls.Add(lbldesig);
this.Controls.Add(tbdes);
this.Controls.Add(lblcomp);
this.Controls.Add(tbcomp);
this.Controls.Add(btnup);
btnup.Click += new EventHandler(btnup_Click);
}
protected override void OnPreRender(EventArgs e)
{
base.OnPreRender(e);
if (connectionInterface != null)
{
id = connectionInterface.parameter1;
SPWeb mysite = SPContext.Current.Web;
SPList mylist = mysite.Lists["UpdateList"];
SPListItemCollection itemcol = mylist.Items;
foreach (SPListItem itm in itemcol)
{
string nm = itm["Company_Id"].ToString();
if (nm.Equals(id))
{
lblid.Text = itm["Company_Id"].ToString();
lblname.Text = itm["Name"].ToString();
l
}
}
}
else
{
lblname.Text = "nothing is recieved!";
}
}
Why is it behaving like this?
This is a normal behavior. If you don't add the control to Controls collection, ASP.NET framework will not preserve its value in postback and hence will be lost during postback.