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

Adding an event handler to an input element should be as easy as using the setAttribute method and specifying the event handler name and the name of the desired function handler, right Wrong. The standard way of setting an element s event handler uses the element s setAttribute method; it uses the event name as the attribute name and the function handler as the attribute value, as follows: var formElement = document.getElementById("formElement"); formElement.setAttribute("onclick", "doFoo();"); The previous code works in all modern browsers except Internet Explorer. To set an element s event handler using JavaScript in Internet Explorer, you must reference the desired event handler via dot notation from the element and assign it to an anonymous function that calls the desired event handler, like so: var formElement = document.getElementById("formElement"); formElement.onclick = function() { doFoo(); }; Note how the onclick event handler is referenced via dot notation from formElement. The onclick event handler is assigned to an anonymous function that simply calls the desired event handler, in this case doFoo. Fortunately, this technique is supported by Internet Explorer and apparently other modern browsers, so you have no reason to avoid setting a form element s event handler dynamically via JavaScript.

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print_any obsolete The results are as follows: [System.ContextMarshalException; System.Collections.IHashCodeProvider; System.Collections.CaseInsensitiveHashCodeProvider; System.Runtime.InteropServices.IDispatchImplType; System.Runtime.InteropServices.IDispatchImplAttribute; System.Runtime.InteropServices.SetWin32ContextInIDispatchAttribute; System.Runtime.InteropServices.BIND_OPTS; System.Runtime.InteropServices.UCOMIBindCtx; System.Runtime.InteropServices.UCOMIConnectionPointContainer; ... Now that you ve seen how you can use attributes and reflection to examine code, let s look at a similar but more powerful technique for analyzing compiled code, called quotation.

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We ve saved the best one for last Creating a radio button dynamically via JavaScript is a particularly arduous task because Internet Explorer s method of creating a radio button is far different from any other browser s method All modern browsers except Internet Explorer allow a radio button to be created using the following expected methods: var radioButton = documentcreateElement("input"); radioButtonsetAttribute("type", "radio"); radioButtonsetAttribute("name", "radioButton"); radioButtonsetAttribute("value", "checked"); The radio button will be created and behave normally in all modern browsers except Internet Explorer In Internet Explorer, the radio button will be displayed, but it s unable to be checked, because clicking the radio button does not check the radio button as it should The method for creating an Internet Explorer radio button is different from the other browsers and totally incompatible.

Quotations are a way of telling the compiler, Don t generate code for this section of the source file; turn it into a data structure, an expression tree, instead. This expression tree can then be interpreted in a number of ways, transformed or optimized, compiled into another language, or even just ignored. Quotations come in two types, raw and typed, the difference being that typed quotations carry static type information whereas raw quotations do not. Both carry runtime type annotations. Typed quotations are designed for use in client programs, so usually you will want to use

Listing C-1. blinkall.nxc #define I2Cport S1 // Port number #define I2CAddr8574 0x70 // I2C address x040 8574 or 0x70 for 8574A byte WriteBuf[]={I2CAddr8574,0x00}; // write buffer is addr and data task main() { int nbytes; SetSensorLowspeed (I2Cport); // Configure I2C port while (true) { WriteBuf[1]++; // update data byte I2CWrite(I2Cport, 0, WriteBuf); // send buffer while(I2CStatus(I2Cport, nbytes)==STAT_COMM_PENDING); // wait } } Listing C-2. low2high.nxc #define I2Cport S1 // NXT sensor port 1 #define I2CAddr8574 0x40 // 0x40 8574 or 0x70 for 8574A byte WriteBuf[] = {I2CAddr8574, 0xFF}; // Sent to 8574 byte ReadBuf[]; // Receive from PCF8574 int RdCnt=1; // Number of bytes to read

typed quotations. These are the only quotations covered in this section. Raw quotations are designed for implementing libraries based on quotations; these will generally be automatically typed quotations before they are consumed. To quote an expression, place it between guillemets (also called French quotes), . To ensure the compiler recognizes these characters, you must save your file as UTF-8. Visual Studio users can do this with File Advanced Save. If you have some objection to using UTF-8, you can use an ASCII alternative: <@ @>. Both ways of quoting an expression are essentially just an operator defined in a module, so you need to open the module Microsoft. FSharp.Quotations.Typed to be able to use them. The next example uses a quotation and prints it: #light open Microsoft.FSharp.Quotations.Typed let quotedInt = 1 printf "%A\r\n" quotedInt The result is as follows: <@ Int32 1 @> If you were to use the ASCII alternative, it would look like this: #light open Microsoft.FSharp.Quotations.Typed let asciiQuotedInt = <@ 1 @> printf "%A\r\n" asciiQuotedInt The result is as follows: <@ Int32 1 @> As you can see, the code doesn t look very different and the results are the same, so from now I ll use guillemets. The following example defines an identifier and uses it in a quotation: #light open Microsoft.FSharp.Quotations.Typed let n = 1 let quotedId = n printf "%A\r\n" quotedId The result is as follows: <@ Prog.n @>