Store and Restore Scrollpositions of ZK-Components

answered 2009-11-08 19:49:49 +0800

tmillsclare
799 ● 2 ● 5 ● 30

Hey Robert,

This is currently not implemented yet, what I have done is added it to the feature requests on sourceforge. You can find it here!

Thanks,
Tim

answered 2009-11-09 23:08:22 +0800

erlen
78

Here's a technique I used that might work for you. Note: I have only tested this in ZK 3.6.2, I don't think it works in ZK 5. In my case I had a tree object. Clicking on a treerow was supposed to update a window sitting next to the tree. Without this technique, if the tree was scrolled down a bit then when the window updated it pushed the scroll bar back to the top...very annoying.

So instead of writing a normal onclick event listener to do my window update, for each treerow (tr) I did

    String uuid=tr.getTree().getUuid()+"!body";
    tr.setAction(
      "onclick: var t=document.getElementById('"+uuid+"');"+
      "comm.sendUser('"+tr.getUuid()+"', t.id, t.scrollTop);"
    );  

and then I wrote an onuser EventListener, and applied it to each treerow:

  private static EventListener onUserListener =
    new EventListener () {
      public void onEvent (Event ev) throws Exception {
        String []data=(String[]) ev.getData();
        String tableBodyId=data[0];
        String scrollTop=data[1];
        if (new Integer(scrollTop).intValue()>0)
          // restore original scrollTop value
          Clients.evalJavaScript("var t=document.getElementById('"+tableBodyId+"');t.scrollTop="+scrollTop+";");
      }
    };

The key was knowing which uuid value to use in order to grab the scrollTop value; I figured it out by using Firebug and a bit of trial and error testing. Tested ok with FF 3.5, and IE 6, 7, 8. Did not test any others.