.NET/Java PDF, Tiff, Barcode SDK Library

Finger electrodes are made by adding some aluminum foil to self-adhesive Velcro. (This type of Velcro comes in long strips and can be purchased from sewing supply stores.) Figure 14-42 shows all the parts of the assembly. You connect the electrode wires to the NXT Sensor Input Pin 1 and 2 (white and black wires) using any of the methods discussed in the previous chapters. Another easy method is to simply cut the LEGO 9V connector from a NXT adapter cable, split the pair of wires, and strip their ends.

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Unlike other browser-based approaches, Ajax won t modify the link displayed in the address bar, meaning you cannot easily bookmark a page or send a link to a friend For many applications this may be desirable, but if your site provides driving directions or something similar, you will need a solution to this problem It s important to not go overboard with Ajax Remember, JavaScript is running on your client s browser, and having thousands of lines of JavaScript can severely slow down your users experiences Poorly coded scripts can quickly spiral out of control, especially as volume increases Ajax allows you to perform operations asynchronously, which is both its greatest strength and one of its major weaknesses We ve trained users that our Web applications perform in a request/response paradigm, but with Ajax, we no longer have that limitation.

If you prefer, you can type your programs into the F# interactive console directly when it s running in stand-alone mode, as shown in Figure 2-2.

Figure 14-43. Completed finger electrodes The program in Figure 14-44 is about the simplest GSR program you can write. The program makes a continuous tone whose frequency is roughly proportional to the skin s resistance. The first Math block makes the frequency higher for lower skin resistance. That way, increased stress relates to increased frequency. The second block magnifies the range of frequency by a factor of 6. Finally, the Sound block is

CHAPTER 2 I HOW TO OBTAIN, INSTALL, AND USE F#

We might be modifying a part of the page, and if the users aren t expecting that, they may be confused So, you need to be careful to keep things obvious to your users don t try to be too clever Remember, when in doubt, test with representative users!.

Figure 2-2. The F# interactive console running in stand-alone mode When you use the interactive console, you type the code you want; then when you ve completed a section, you use two semicolons (;;) to indicate that the compiler should compile and run it. F# interactive responds to commands in two ways. If you bind a value to an identifier, it prints the name of the identifier and its type. So, typing the following into F# interactive: > let i = 1 + 2;; gives the following: val i : int However, if you just type a value into F# interactive, it will respond slightly differently. Typing the following into F# interactive: > 1 + 2;; gives the following: val it : int = 3

configured with the window shown in Figure 14-44. Notice that the block is set for Tone, low volume, and not to Wait for Completion. Because the Sound block ignores negative frequency inputs, when the electrodes aren t connected to anyone, there isn t any audible tone.

So, if innerHTML isn t the answer, what are you actually doing on the client side If you ve looked at the W3C s Load and Save specification, you would see things such as ACTION_APPEND_AS_CHILD and ACTION_REPLACE. Taconite supports these actions and others, giving you complete flexibility with content placement. Following the ideals of the Load and Save specification should make the transition from Taconite to the W3C specification easier. Taconite currently supports the following actions, assuming that the actions are in reference to a specified context element:

CHAPTER 2 I HOW TO OBTAIN, INSTALL, AND USE F#