[Users] Disable Nodes on Zoom Event

[Matt Priour]

You have to "Apply" the patch. The exact instructions are SVN client dependant. If you are using SVN command-line then the OL wiki has good instructions. [1]

If you are using something like TortiseSVN, then you would right click on the GeoExt root directory in the file explorer. 
Select TortiseSVN -> Apply Patch
Then select the patch file and hit apply

[1] http://trac.osgeo.org/openlayers/wiki/ApplyingPatches

Matt Priour
Kestrel Computer Consulting


From: IT Intern 
Sent: Thursday, October 28, 2010 10:17 AM
To: users at geoext.org 
Subject: Re: [Users] Disable Nodes on Zoom Event


My apologies, just realized it is a patch file not a .js, but I still need to know where exactly it goes...


On Thu, Oct 28, 2010 at 11:15 AM, IT Intern <itintern12 at gmail.com> wrote:

  That's quite awesome!  Thanks Matt.  So now where do I apply this patch :p

  Do I just copy the file into 

  lib/GeoExt/widgets/tree
  and override the old LayerNode.js no worries???

  cheers,

  elshae 




  On Thu, Oct 28, 2010 at 10:46 AM, Matt Priour <mpriour at kestrelcomputer.com> wrote:

    OpenLayers already has a Map moveend event handler that will check to see if the layer is still in range (maxExtent, minResolution, maxResolution, minScale & maxScale are all tested)
    You should use one of these configuration options (maxResolution, minResolution are easiest) on the layers and let OL do the turning on/off layers for you.

    To have your GeoExt LayerNodes respond by enabling/disabling when layers are in/out of range, you can apply the autoDisable patch [1] attached to Ticket #235 (http://trac.geoext.org/attachment/ticket/235)

    [1] http://trac.geoext.org/attachment/ticket/235/autoDisableLayerNode.patch

    Matt Priour
    Kestrel Computer Consulting




    From: IT Intern 
    Sent: Thursday, October 28, 2010 9:08 AM
    To: users at geoext.org 
    Subject: [Users] Disable Nodes on Zoom Event


    Hello GeoExt Users,

    I have a zoom event that when a user zoom in and out of my map certain layers I setVisibility(false).  Now what I would like to do is have another event inside that event which disables the nodes of those layers when their setVisibilty(false) and enables them back when setVisibility(true).  I have some code and it kinda works, but the problem is the checkchange event does not only work when the zoomend event is done, but also anytime a user clicks the layer nodes.  I played a little with stopPropagation and that didn't do anything for me.  Actually I think my zoomend event could be much better coded and I would really love some suggestions.  I appreciate everyone taking their time to help me :)

    elshae

    Code:

    map.events.on({ "zoomend": function (e) {

                      layerTree.on("checkchange", function (node, checked) {
                        alert(node.text + "Inside event");
                        if(checked == false)
                            node.disable();
                        else if(checked == true)
                            node.enable();

                    });
                          
                          if (this.getZoom() > 7) {
                              tib_villages.setVisibility(true);
                              tib_lakes.setVisibility(true);
                              tib_townships.setVisibility(true);

                            
                        }
                        else {

                                        tib_villages.setVisibility(false);
                                        tib_lakes.setVisibility(false);
                                        tib_townships.setVisibility(false);
                                        //alert(layerTree.tib_villages.node.text);
                  
                            if (this.getZoom() > 5) {
                                  infrastructure.setVisibility(true);
                                  geography.setVisibility(true);
                                  geography2.setVisibility(true);
                                  tib_countys.setVisibility(true);
                                  
                            }
                            else{
                                infrastructure.setVisibility(false);
                                geography.setVisibility(false);
                                  geography2.setVisibility(false);
                                  tib_countys.setVisibility(false);
                            }
                        }//end else
                        
                    }//end function (e)
                    
                }); //end map.events.on



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