.NET/ASP.NET/C#/VB.NET PDF Document SDK

Bad solder joints, like those shown in Figure A-14, are usually the result of not heating the joint sufficiently. The joint might have voids as in the top example, or have a blob-like appearance as in the lower example. Bad joints might also look dull. Just reheat the joint and add solder if necessary.

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Random(y) end Indexers are properties that take two or more parameters, one to represent the element being placed in the pseudocollection and others to represent the index in it In C# all indexers are called Item in the underlying implementation, but the programmer never actually uses this name because it is always implicit In F#, the programmer can choose the name of the indexer property If the programmer chooses the name Item, then there is special syntax for accessing the property The syntax for creating an indexer is the same as a property, except a get method has one or more parameters, and a set method has two or more parameters To access an element in an indexer, if its name is Item, you can use a special syntax that looks like array access except with the parentheses replaced by square brackets: #light type Indexers(vals:string[]) = class member x.

The WeatherForecasts object is attached as an attribute to the request object, and finally the servlet forwards the request and response to the weatherForecastAjaxjsp file Listing 8-6 UpdateWeatherForecastServletjava package ajaxdashboardservlet; import ajaxdashboardserviceWeatherForecastService; import javaio*; import javautilDate; import javaxservlet*; import javaxservlethttp*; public class UpdateWeatherForecastServlet extends HttpServlet { protected void processRequest(HttpServletRequest request , HttpServletResponse response) throws ServletException, IOException { String zipCode = requestgetParameter("forecastZipCode"); WeatherForecastService forecastService = new WeatherForecastService(); requestsetAttribute("forecastData" , forecastServicegetForecastFor(zipCode)); Systemoutprintln("Weather updated at: " + new Date()toString());.

Figure A-14. Examples of bad solder joints Cut off the excess component lead close to the connection with diagonal cutters. The finished joint should look like Figure A-15 in cross-section.

Item with get (y) = vals[y] and set (y, z) = vals[y] <- z member xMyString with get (y) = vals[y] and set (y, z) = vals[y] <- z end let index = new Indexers [|"One"; "Two"; "Three"; "Four"|] index[0] <- "Five"; indexItem(2) <- "Six"; indexMyString(3) <- "Seven"; print_endline index[0].

print_endline (index.Item(1)) print_endline (index.MyString(2)) print_endline (index.MyString(3)) The results of the previous example, when compiled and executed, are as follows: Five Two Six Seven

request.getRequestDispatcher("/jsp/weather/weatherForecastAjax.jsp") .forward(request, response); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } } In previous examples, the response has always been returned to the browser in a format such as XML or maybe JSON, where the browser was responsible for reading the response and generating new content or updating existing content based on the results. This often requires several lines of document.createElement() or document.appendChild() calls, which can be tedious to write. For instance, the Yahoo! search example from 4 required 37 lines of code to render the results. Compare that to Listing 8-7, which shows the contents of the weatherForecastAjax.jsp file. This file is only 19 lines long (eight of which are blank lines) and completely handles updating the weather forecast component in response to an Ajax request. Listing 8-7. weatherForecastAjax.jsp <%@ taglib uri="http://taconite.sf.net/tags" prefix="tac" %> <tac:taconiteRoot> <tac:replaceChildren contextNodeID="forecastLocation" parseOnServer="true"> <%@ include file="weatherLocation.jsp" %> </tac:replaceChildren> <tac:replaceChildren contextNodeID="weatherContent" parseOnServer="true"> <%@ include file="weatherTable.jsp" %> </tac:replaceChildren> </tac:taconiteRoot> Thanks to the magic of the Taconite framework, you are no longer required to spend time writing W3C DOM methods to dynamically update the page when handling the response of an Ajax request. Instead, Taconite generates the JavaScript for you, which is returned to the browser and executed to produce the desired outcome.

Figure A-15. Cut excess component lead flush with the joint Solder bridges are a common problem when soldering this type of PCB. A little too much solder gets into the joint and flows over onto the next trace. Don t panic! Hold the PCB vertically in one hand and bring the soldering iron tip up to the bridge from below, as shown in Figure A-16. The excess solder should flow back onto the tip, where you can wipe it off on the damp sponge. Unsoldering tools are available that you can use to vacuum practically all the solder from a joint.