How to load data in TabbedPage when a tab is clicked?
I am using TabbedPage for navigation with tabs. All my Page classes have just an empty default constructor and I load my data in the OnAppearing method. I have 5 tabs. As soon as I click on the second tab, the OnAppearing methods of the 3rd, 4th and 5th pages are also called.
How do I ensure that the data is only loaded when I click on the tab?
forms xamarin tabbedpage
edited Dec 31 '18 at 1:34
bunbun
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
add a comment |
I am using TabbedPage for navigation with tabs. All my Page classes have just an empty default constructor and I load my data in the OnAppearing method. I have 5 tabs. As soon as I click on the second tab, the OnAppearing methods of the 3rd, 4th and 5th pages are also called.
How do I ensure that the data is only loaded when I click on the tab?
forms xamarin tabbedpage
edited Dec 31 '18 at 1:34
bunbun
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02
add a comment |
I am using TabbedPage for navigation with tabs. All my Page classes have just an empty default constructor and I load my data in the OnAppearing method. I have 5 tabs. As soon as I click on the second tab, the OnAppearing methods of the 3rd, 4th and 5th pages are also called.
How do I ensure that the data is only loaded when I click on the tab?
forms xamarin tabbedpage
edited Dec 31 '18 at 1:34
bunbun
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
I am using TabbedPage for navigation with tabs. All my Page classes have just an empty default constructor and I load my data in the OnAppearing method. I have 5 tabs. As soon as I click on the second tab, the OnAppearing methods of the 3rd, 4th and 5th pages are also called.
How do I ensure that the data is only loaded when I click on the tab?
forms xamarin tabbedpage
forms xamarin tabbedpage
edited Dec 31 '18 at 1:34
bunbun
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
edited Dec 31 '18 at 1:34
bunbun
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
edited Dec 31 '18 at 1:34
bunbun
2,02532446
edited Dec 31 '18 at 1:34
bunbun
2,02532446
edited Dec 31 '18 at 1:34
bunbun
2,02532446
2,02532446
asked Dec 29 '18 at 10:53
M_BM_B
81
asked Dec 29 '18 at 10:53
M_BM_B
81
asked Dec 29 '18 at 10:53
M_BM_B
81
81
You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02
add a comment |
You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02
You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02
add a comment |
1 Answer
1
active
oldest
votes
Solution:
You can get the index of currentPage in method OnCurrentPageChanged And if the index equals 1(second page) , use the messagecenter to send message to the page.Refer the following code .
in Tabbed Page
protected override void OnCurrentPageChanged()
{
base.OnCurrentPageChanged();
int index = Children.IndexOf(CurrentPage);
if (index == 1)
{
MessagingCenter.Send<Object>(this, "click_second_tab");
}
else if (index == 2)
{
MessagingCenter.Send<Object>(this, "click_third_tab");
}
}
in the second page .Move the code that load data from onAppearing to the constructor
public MyPage1()
{
//...
MessagingCenter.Subscribe<Object>(this, "click_second_tab", (obj) =>
{
//load your data here
Console.WriteLine("11111");
});
}
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
It worked, thank you very much!
– M_B
Jan 4 at 21:44
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Solution:
You can get the index of currentPage in method OnCurrentPageChanged And if the index equals 1(second page) , use the messagecenter to send message to the page.Refer the following code .
in Tabbed Page
protected override void OnCurrentPageChanged()
{
base.OnCurrentPageChanged();
int index = Children.IndexOf(CurrentPage);
if (index == 1)
{
MessagingCenter.Send<Object>(this, "click_second_tab");
}
else if (index == 2)
{
MessagingCenter.Send<Object>(this, "click_third_tab");
}
}
in the second page .Move the code that load data from onAppearing to the constructor
public MyPage1()
{
//...
MessagingCenter.Subscribe<Object>(this, "click_second_tab", (obj) =>
{
//load your data here
Console.WriteLine("11111");
});
}
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
It worked, thank you very much!
– M_B
Jan 4 at 21:44
add a comment |
Solution:
You can get the index of currentPage in method OnCurrentPageChanged And if the index equals 1(second page) , use the messagecenter to send message to the page.Refer the following code .
in Tabbed Page
protected override void OnCurrentPageChanged()
{
base.OnCurrentPageChanged();
int index = Children.IndexOf(CurrentPage);
if (index == 1)
{
MessagingCenter.Send<Object>(this, "click_second_tab");
}
else if (index == 2)
{
MessagingCenter.Send<Object>(this, "click_third_tab");
}
}
in the second page .Move the code that load data from onAppearing to the constructor
public MyPage1()
{
//...
MessagingCenter.Subscribe<Object>(this, "click_second_tab", (obj) =>
{
//load your data here
Console.WriteLine("11111");
});
}
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
It worked, thank you very much!
– M_B
Jan 4 at 21:44
add a comment |
Solution:
You can get the index of currentPage in method OnCurrentPageChanged And if the index equals 1(second page) , use the messagecenter to send message to the page.Refer the following code .
in Tabbed Page
protected override void OnCurrentPageChanged()
{
base.OnCurrentPageChanged();
int index = Children.IndexOf(CurrentPage);
if (index == 1)
{
MessagingCenter.Send<Object>(this, "click_second_tab");
}
else if (index == 2)
{
MessagingCenter.Send<Object>(this, "click_third_tab");
}
}
in the second page .Move the code that load data from onAppearing to the constructor
public MyPage1()
{
//...
MessagingCenter.Subscribe<Object>(this, "click_second_tab", (obj) =>
{
//load your data here
Console.WriteLine("11111");
});
}
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
Solution:
You can get the index of currentPage in method OnCurrentPageChanged And if the index equals 1(second page) , use the messagecenter to send message to the page.Refer the following code .
in Tabbed Page
protected override void OnCurrentPageChanged()
{
base.OnCurrentPageChanged();
int index = Children.IndexOf(CurrentPage);
if (index == 1)
{
MessagingCenter.Send<Object>(this, "click_second_tab");
}
else if (index == 2)
{
MessagingCenter.Send<Object>(this, "click_third_tab");
}
}
in the second page .Move the code that load data from onAppearing to the constructor
public MyPage1()
{
//...
MessagingCenter.Subscribe<Object>(this, "click_second_tab", (obj) =>
{
//load your data here
Console.WriteLine("11111");
});
}
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
answered Jan 1 at 7:56
Lucas Zhang - MSFTLucas Zhang - MSFT
1,916228
1,916228
It worked, thank you very much!
– M_B
Jan 4 at 21:44
add a comment |
It worked, thank you very much!
– M_B
Jan 4 at 21:44
It worked, thank you very much!
– M_B
Jan 4 at 21:44
It worked, thank you very much!
– M_B
Jan 4 at 21:44
add a comment |
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You have to react to OnCurrentPageChanged of the tabbed bar, ignoring it on startup when just adding new tabs. After that you can, for example, send messages to pages upon this event or call their code from your subclassed tabbed page.
– Nick Kovalsky
Dec 29 '18 at 15:05
Hey,did you solve the issue?
– Lucas Zhang - MSFT
Jan 2 at 1:02