1. #1
    Sencha User elwhiz's Avatar
    Join Date
    Apr 2009
    Posts
    28
    Vote Rating
    0
    elwhiz is on a distinguished road

      0  

    Default Scroll to view the selected list item function

    Scroll to view the selected list item function


    Hi,

    We have an application that has a list with many items.
    In Portrait mode on the iPad, the user can see about 5 items. We maintain a "currently" selected item in the list.
    Is there a function that I can call, to ensure the currently Selected item is always visible?

    For example...
    Let's say there are 50 items in the list.
    Then, let's say the user has scrolled down and selected item #40.
    Then, the list gets refreshed.
    After the list is reloaded, I need to call a function that will automatically scroll item #40 into view.

    Is there such a function ?

    Thanks

  2. #2
    Sencha - Senior Forum Manager mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Location
    Gainesville, FL
    Posts
    36,824
    Vote Rating
    836
    mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute

      0  

    Default


    You need to get the position of the selected item and then scroll to it.

    Code:
    var store = list.getStore(),
        selected = list.getSelection()[0],
        idx = store.indexOf(selected),
        els = list.container.getViewItems(),
        el = els[idx],
        offset = el.dom.offsetTop;
    
    list.getScrollable().getScroller().scrollTo(0, offset);
    *typed from top of my head*
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
    ________________
    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
    https://github.com/mitchellsimoens

    Think my support is good? Get more personalized support via a support subscription. https://www.sencha.com/store/

    Need more help with your app? Hire Sencha Services services@sencha.com

    Want to learn Sencha Touch 2? Check out Sencha Touch in Action that is in print!

    When posting code, please use BBCode's CODE tags.

  3. #3
    Sencha User
    Join Date
    Sep 2011
    Posts
    78
    Vote Rating
    1
    shweta.saxena09 is on a distinguished road

      0  

    Default


    Uncaught TypeError: Cannot read property 'offsetTop' of undefined

    Error is showing

  4. #4
    Sencha - Senior Forum Manager mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Location
    Gainesville, FL
    Posts
    36,824
    Vote Rating
    836
    mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute

      0  

    Default


    may have to do Ext.get(el).dom.offsetTop then
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
    ________________
    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
    https://github.com/mitchellsimoens

    Think my support is good? Get more personalized support via a support subscription. https://www.sencha.com/store/

    Need more help with your app? Hire Sencha Services services@sencha.com

    Want to learn Sencha Touch 2? Check out Sencha Touch in Action that is in print!

    When posting code, please use BBCode's CODE tags.

  5. #5
    Sencha User
    Join Date
    Sep 2011
    Posts
    78
    Vote Rating
    1
    shweta.saxena09 is on a distinguished road

      0  

    Default


    Code:
    onItemTap: function(list, index, target, record, e) {        
                var store = list.getStore(),
                selected = list.getSelection()[0],
                idx = store.indexOf(selected),
                els = list.container.getViewItems(),
                el = els[idx],
                offset = Ext.get(el).dom.offsetTop;
    
    
               list.getScrollable().getScroller().scrollTo(0, offset);
    }
    Not working

  6. #6
    Sencha - Senior Forum Manager mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Location
    Gainesville, FL
    Posts
    36,824
    Vote Rating
    836
    mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute

      0  

    Default


    Which part? Have you tried anything else?
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
    ________________
    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
    https://github.com/mitchellsimoens

    Think my support is good? Get more personalized support via a support subscription. https://www.sencha.com/store/

    Need more help with your app? Hire Sencha Services services@sencha.com

    Want to learn Sencha Touch 2? Check out Sencha Touch in Action that is in print!

    When posting code, please use BBCode's CODE tags.

  7. #7
    Sencha User
    Join Date
    Sep 2011
    Posts
    78
    Vote Rating
    1
    shweta.saxena09 is on a distinguished road

      0  

    Default


    when itemtap event fire the selected item should be set on top....

    But without disturbing his default scrolling functionality.......

  8. #8
    Sencha User
    Join Date
    Sep 2011
    Posts
    78
    Vote Rating
    1
    shweta.saxena09 is on a distinguished road

      0  

    Default


    Even this code is not working with simple static data list...................
    I have changed the scrollTo(0, offset) to scrollTo(0, 0) now cursor jump on top of the list...... but selected item is still in same position... i have to scroll to reach.....

  9. #9
    Sencha User
    Join Date
    Sep 2011
    Posts
    78
    Vote Rating
    1
    shweta.saxena09 is on a distinguished road

      0  

    Default


    Issue solved

    Thanks

  10. #10
    Sencha - Senior Forum Manager mitchellsimoens's Avatar
    Join Date
    Mar 2007
    Location
    Gainesville, FL
    Posts
    36,824
    Vote Rating
    836
    mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute mitchellsimoens has a reputation beyond repute

      0  

    Default


    Quote Originally Posted by scottd View Post
    Container does not have a getViewItems() method. What were you trying to get to, Mitchell?
    Sure it does: http://docs.sencha.com/touch/2-0/#!/...d-getViewItems
    Mitchell Simoens @SenchaMitch
    Sencha Inc, Senior Forum Manager
    ________________
    Check out my GitHub, lots of nice things for Ext JS 4 and Sencha Touch 2
    https://github.com/mitchellsimoens

    Think my support is good? Get more personalized support via a support subscription. https://www.sencha.com/store/

    Need more help with your app? Hire Sencha Services services@sencha.com

    Want to learn Sencha Touch 2? Check out Sencha Touch in Action that is in print!

    When posting code, please use BBCode's CODE tags.