Friday night javascript notes

Uhg! A few things that are worth writing down - the kind of things you know but then forget you know when you are programming.

First - The DOM is case sensitive in Firefox, not in I.E. though... So imageId3 is different than ImageId3 as far as Mozilla is concerned.

O.K. that first one is like Duh! but this second point is not so much, as it turns out that if you have a variable that hasn't been assigned yet I.E. doesn't really care so much, you can try and talk to it and nothing happens - Firefox on the other hand blows up, at the least the function does. the minute you try and access that null variable Mozilla throws an error and the rest of the function won't execute. The trick is to see if there is a value assigned to it. I searched the web for a while and finally over at webdeveloper.com someone gave me this code.

if(typeof imageContainer == 'undefined')

There is an explanation at the original post. http://webdeveloper.com/forum/showthread.php?p=990761#post990761

OK - That's it for now, hope that helps you out on your JS travels.

Comments

Connecting to a HiTechnic prototype board to an Arduino

Connecting to a HiTechnic prototype board to an Arduino. If you are thinking to yourself, “ Wouldn't it be fun to take a prototype board from Hitechnic and connect it to my Arduino? I wonder if it is possible...” Well I am here to tell you that Yes, indeed it is possible, it is not only possible it works rather nicely, of course - HiTechnic doesn’t really support this and the NXT documentation doesn’t have a section called “Cutting a cable in half to connect it your Arduino” so it took a little research to make it it happen which is why I thought I would share this information with the world. Step one - the cable I took a cable from my mindstorms kit and chopped one end off, I then took some nice stiff jumper wires and soldered them onto the ends so I had something that I could plug into the Arduino. Step two - What goes where. So the big question was what pins to plug it into on the Arduino. I have an Uno which means that pins A4 and A5 a...

Copying items to a output directory using post-build events

Certain times you are going to need to move things to some sort output directory after they are built, for whatever reason - maybe your program is looking for a list of modules that it will load when it fires up (you can do this with prism)? It's easy to do, just go to the "Properties" for your project and select "Build Events". in the box titled "Post-Build event command line" enter your xcopy command. Somthing like this. xcopy "$(TargetDir)PARTSFinderModule.dll" "$(SolutionDir)\MyProject\bin\$(PlatformName)\$(ConfigurationName)\DirectoryModules" /Y That's it.

Musings on using a module catalog with Prism

anyone using prism is probably familar with the bootstrapper, the documentation defines the bootstrapper as a class responsible for initialization of an application built using Prism and if you dig into the code for it you will see lots of virtual methods that you can override when setting up your application, one of those is the CreateModuleCatalog(). There are several ways to initialize your modules but using an xaml file is incredibly convenient especially if you only want certain parts of your application to load under certain conditions. Where I work we recently decided to employ this feature so that we could load a subset of the application in the warehouse and not have the sales and other modules loading up at run time, on the flip side the warehouse module doesn't load when the sales team loads the application. The great part for the developer is you don't end up with multiple code bases, your core and infrastructure is shared in one application and different people see...

Refriedgeek @r0k3t

Search This Blog