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Often a control may want to generate client-side script in addition to static HTML as part of its rendering process If the client browser supports DHTML, it is often possible to shift some of the behavior of a control to the client and thus avoid unnecessary round-trips For example, suppose we wanted to build a control Table of Contents that rendered a tic-tac-toe game board, which allows the user to click in a square to add an X or an O in Essential ASPNET with Examples in C# alternating fashion, as shown in Figure 8-2
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Figure 8-2 Tic-tac-toe Board Rendered with DHTML
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Publisher Pub Date ISBN Pages : Addison Wesley : February 11, 2003 : 0-201-76040-1 : 432
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing from its pages It captures the true essence of ASPNET and walks the reader to a high level of technical and architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom A na ve approach to building a control that would render this board might be to add a client script block with a handler function to toggle in C# and Os for the Onclick event, followed by for ASPNET through Essential ASPNET with Examples the Xs is the C# programmer's definitive reference the HTML table and cells that would generate the client-side events This approach is shown in Listing 8-19 version 11 It provides experienced programmers with the information needed to fully understand the technology, and is a clear guide to using ASPNET to build robust and well architected Web applications Listing 8-19 Na ve Client Script Generation This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including class TicTacToe : Control public the server-side compilation model, code-behind classes, server-side controls, form validation, the data binding model, and custom control development Throughout the book, working examples illustrate { best practices for building Web-based applications in C# protected override void Render(HtmlTextWriter output)
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Among the topics explored in depth are: outputWriteLine("<script language=javascript>
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"); outputWriteLine("var g_bXWentLast; "); outputWriteLine("function OnClickCell(cell) { "); ASPNET architecture outputWriteLine(" if (cellinnerText == ' ') { "); outputWriteLine(" if (g_bXWentLast) "); Web forms outputWriteLine(" cellinnerText = 'O'; "); outputWriteLine(" else "); Configuration outputWriteLine(" cellinnerText = 'X'; "); outputWriteLine(" g_bXWentLast = !g_bXWentLast;"); HTTP pipeline outputWriteLine(" } "); outputWriteLine(" else "); Diagnostics and error handling outputWriteLine(" cellinnerText = ' '; "); Validation outputWriteLine(" } </script> ");
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Data binding /* additional style attributes not shown */ outputRenderBeginTag(HtmlTextWriterTagTable); Custom controls for (int row=0; row<3; row++) { Caching outputRenderBeginTag(HtmlTextWriterTagTr); for (int col=0; col<3; col++) State management { outputAddAttribute(
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HtmlTextWriterAttributeOnclick, "OnClickCell(this)"); outputRenderBeginTag(HtmlTextWriterTagTd); outputWrite(" "); outputRenderEndTag();
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} outputRenderEndTag(); } outputRenderEndTag(); } }
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This control will work well as long as it is never used more than once on a single page Placing multiple instances of this control on a page, however, causes two problems The first problem is that the script block Table of to the page, which can cause undetermined behavior, especially since we are will be rendered twice Contents declaring a global script variable Examples whether Essential ASPNET withto keep track ofin C# an X or an O should be placed in the next square The second problem is that our single global script variable, g_bXWentLast, will not have the correct value ByFritz Onion if a user clicks in one instance of our control and then another (it is easy to generate two Xs in a row on one board, for example) These two problems are indicative of problems that most controls encounter when they Publisher : Addison Wesley try to add client-side script as part of their rendering
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Pub Date : February 11, 2003 ISBNfirst problem can easily be solved by using the helper function RegisterClientScriptBlock in the : 0-201-76040-1 The
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Page Pages class :This function takes a pair of strings as parameters; the first string is a name for the script block, 432
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so that if a script block is ever registered multiple times on a given page, it will still be rendered only once The second string is the actual script block you want included in the page The best place to call this function is in a handler for the Init event of your control, as shown in Listing 8-20
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"This well-conceived and well-written book has extensive knowledge and priceless experience overflowing Listing pages It captures the true essence of ASPNET and walks the reader to a high level of technical and from its 8-20 Calling RegisterClientScriptBlock architectural skill"-J Fred Maples, Director of Software Engineering, NASDAQcom Essential ASPNET with Examples in C# is the C# programmer's definitive reference for ASPNET through protected override void OnInit(EventArgs e) version 11 It provides experienced programmers with the information needed to fully understand the { technology, and is a clear guide to using ASPNET to build robust and well architected Web applications PageRegisterClientScriptBlock("MyScriptBlock",
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"<script language=javascript>/*code here*/</script>");
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This book begins with a discussion of the rationale behind the design of ASPNET and an introduction to how } it builds on top of the NET framework Subsequent chapters explore the host of new features in ASPNET, including the server-side compilation model, code-behind classes, server-side controls, form validation, the datasecond problem and custom control development Throughout theinstance of our control This is a The binding model, is maintaining client-side state on behalf of each book, working examples illustrate best practices for building Web-based applications in C# and relying on a single set of functions to perform common problem for controls rendering client-side script some client-side logic It is important to plan for the scenario that someone places multiple instances of Among the topics page, andin depth are: behavior become undefined Fortunately, as covered earlier in this your control on a explored not have the chapter, there is a unique identifier associated with each control that will always be a valid JavaScript identifier:ClientID Thus, the solution to our tic-tac-toe control problem is to keep an associative array of ASPNET architecture Booleans, indexed by the ClientID of our control, thereby guaranteeing unique state for each instance of our control The complete and correct implementation of our tic-tac-toe control is shown in Listing 8-21 Web forms
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