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As you cut away other small PCBs, you ll notice that the printed column numbers no longer match the solderless breadboard. The original painted numbers are easily scratched off, and you can re-mark them with permanent marker.

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The ajaxDashboard.js file consists of JavaScript that must run when the page is loaded. Located outside the body of a function, code is executed as soon as it s loaded by the browser. The majority of the code is required by the DOM-Drag library to initialize the draggable behavior of the component windows. The initDomDrag function located in ajaxDashboard.js encapsulates the code needed to initialize the draggable behavior of a component, as follows: function initDomDrag(handleID, rootID) { var handle = document.getElementById(handleID); var root = document.getElementById(rootID); Drag.init(handle, root); } The handle variable refers to the div element that makes up the colored title bar of the component. This is the handle on which the mouse can be used to click and drag the rest of the component. The root variable refers to the parent div element that encloses all the component s content. The handle element must be a child element of the root element. Finally, the last line passes the root and handle variables to the DOM-Drag library to make the component draggable. For example, the following initDomDrag function makes the stock quote component draggable: initDomDrag("stockQuoteHandle", "stockQuoteRoot");

printfn "myObject.state = %i, myObject.otherState = %i" myOtherObject.state myOtherObject.otherState The results of this example, when compiled and executed, are as follows: myOtherObject.state = 1, myOtherObject.otherState = 0 When using implicit class construction, the call to the base class constructor is specified as part of the inherits declaration. For example, you can rewrite the previous example as follows, giving the same results: type Base1(state) = class member x.State = state end type Sub1(state) = class inherit Base1(state) member x.OtherState = state end let myOtherObject = new Sub1(1) printfn "myObject.state = %i, myObject.otherState = %i" myOtherObject.State myOtherObject.OtherState

Soldering the parts to the PCB is probably the scariest part. It requires a certain amount of skill, but after a few connections you ll find that it really isn t that difficult. Making good solder connections requires following a few basic rules: The soldering iron should be a 25-to-40-watt pencil type with a 1/8"-to-3/16" chisel- or coneshaped tip. Always wait at least five minutes for the soldering iron to come up to temperature. The solder should be rosin core 60/40 tin/lead content with .062" diameter. Never use acid core or the type used for plumbing.

Listing 8-3 details the code that renders the weather forecast window. The parent element here is the div element with an id attribute of root. The first child element of the outermost div element is another div element with an id attribute of handle. This div represents the colored title bar of the component and the area that can be clicked and dragged to move the entire component around the screen. All the components that make up the Ajax Dashboard follow this same pattern: an outmost div element that represents the component window, immediately followed by another div that defines the component s colored title bar. In the case of the weather forecast component, the HTML that renders the title bar is followed by a div element that encloses the text box into which the desired ZIP code is entered. Finally, a div element with an id attribute of weatherContent encloses the actual weather forecast. Listing 8-3. weatherForecast.jsp <%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <div id="root" style="left:20px; top:20px;"> <div id="handle"> <table width="100%" border="0" class="textbox"> <tr> <td align="left" class="controls"> <span id="forecastLocation"> <%@ include file="weatherLocation.jsp" %> </span> </td>

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