Quick notes on Dojo 1.8

Just a quick notes on dojo 1.8. For example, if I want to use the Color object in dojo. I will:

   var Color;

   require(["dojo/_base/Color"], function(c) {
      Color = c;
   });

Then I can use the variable Color after the initialization is done. Am I correct? Should it be used in another way? :-)

Upgrading from ArcGIS Android API v1.1 to v2.0

If you got a ArcGIS Android Project using ArcGIS API v1.1 and switch to v2.0, you will have a runtime exception when you do a pan action in the map view.

   FATAL EXCEPTION: main
   java.lang.UnsatisfiedLinkError: nativeSetAnimating
   com.esri.android.map.MapSurface.nativeSetAnimating(Native Method)
   ...

To solve this problem, you need to:

1. Create a new ArcGIS Android project using v2.0
2. Copy the files "libs/armeabi/libGLMapCore.so" and "libs/armeabi-v7a/libGLMapCore.so" back to your original v1.0 project directory

Very stupid right? But choose to use this product is stupid enough.

DOJO: Tab ordering in TabContainer

The tabContainer.getChildren( ) method returns a list of tab widget (ContentPane) in the container using the following way:

    dijit.findWidgets(tabContainer.containerNode)

However, if you did some drag and drop actions on the tab button list to rearrange the tab ordering, the tab sequence did not changed actually. To get a modified / correct ordered list, you may try to override the getChildren( ) method:

    myTabContainer.getChildren = function() {
        var list = this.tablist.getChildren();
        var rsltList = [];
        for (var idx=0; idx<list.length; idx++) {
           rsltList.push(list[idx].tab);
        }
        return rsltList;
    }

Noticed the underlined "tab" member variable in the code, you need to manually assign it when your tab page is created. Or you may find a way / method to get the Tab page object (ContentPane) via the Tab Button.

If you got any better method, please let me know :-)

Drag and Drop of Tab in Dojo

Check the following example for a hint to do drag and drop of tab page in Dojo:

Overriding window.open( ) in Javascript

Sometimes you may want override the window.open( ) in Javascript. It's strange, but you really it occasionally. Here is how we can do it:

var open_ = window.open;

window.open = function(url, name, opts) {

   return open_(url, name, opts);

}

Then you can add your own checking / modifications right before the window is opened.

ArcGIS JS: Move a graphic to top

To move a graphic in a ArcGIS JS GraphicsLayer to top:

g.getDojoShape().moveToFront();

But this may breaks the onClick event of the GraphicsLayer, beware.

Updated: in ArcGIS JS API version 3.8, use getShape( ) instead. ESRI... no more stupid naming please...

Filter in Wireshark

Suppose you want to monitor the HTTP request from 192.168.0.1 to 202.168.1.2 with a particular URI (e.g. saveUserInfo/) using Wireshark, you can specify the above situation using the filter below:

ip.src == 192.168.0.1 and http.host = "202.168.1.2" and http.request.uri contains "saveUserInfo"

Quite handy :)

JSP too large for Tomcat

A long JSP just worked in Tomcat 6.0.29. Somehow when we put it in 6.0.35, it got error "Unresolved compilation problem".

It seems that the new Jasper (/lib/ecj-3.7.jar) just not work for large JSP. One of the solution will be using the Jasper from 6.0.29 (/lib/jasper-jdt.jar) instead.

Or.. keep using the 6.0.29 for some while...

Secure the ArcGIS Server

References for securing the ArcGIS server:

• http://blogs.esri.com/esri/arcgis/2010/06/23/five-things-to-consider-when-securing-arcgis-server/
• http://geochalkboard.wordpress.com/2010/12/13/using-a-proxy-page-with-the-arcgis-server-api-for-javascript/
• http://resources.esri.com/help/9.3/arcgisserver/apis/javascript/arcgis/help/jshelp/ags_proxy.htm#webprint

Small HTTP servers for Windows

Some mini size HTTP server software for Windows:

• QuickPHP
• Abyss
• nginx

For nginx, if you want to add an alias which point to another location which is not under the root directory, you can put the following in the nginx.conf:

location /web {

    alias   d:/Code/nginx_web;

}

        

This means for locations http://yourhost/web, it is pointing to d:\Code\nginx_web actually.

So what about ProxyPass in nginx? I will try on it tomorrow. Keep update soon.