.NET/Java PDF, Tiff, Barcode SDK Library

The order that modules are passed to the compiler is important, because it affects the scope of identifiers within the modules and the order in which the modules are executed. I cover scope in this section and execution order in the next. Values and types within a module cannot be seen from another module unless the module they re in appears on the command line before the module that refers to them. This is probably easier to understand with an example. Suppose you have a source file, ModuleOne.fs, containing the following:

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rowsers have come a long way since 1999. Thanks to standards bodies such as the W3C and ECMA and a revival of competition in the browser market, modern browsers have largely eliminated the proprietary extensions and behaviors that plagued browsers in the late 1990s. Gone are the days when developers had to spend countless hours tweaking HTML layout and JavaScript code to get an application to function properly across different browsers. Today, developers who write code that adheres to standards can be assured that the code will function properly in any standards-compliant browser. Implementing Ajax techniques in your application will likely dictate that you use JavaScript to dynamically update the page content, whether it be by creating new content, deleting existing content, or changing existing content. Unfortunately, some quirks do still exist in certain browsers, causing erratic behavior and giving developers headaches. The most frequent offender of these quirks is Internet Explorer. Internet Explorer s HTML-rendering engine and JavaScript environment have received few updates in the past several years, and thus Internet Explorer is the least standards-compliant browser today. However, since Internet Explorer continues to maintain most of the browser market, you must write JavaScript code that works effectively in Internet Explorer as well as other browsers. The scenarios in this appendix are situations in which you re likely to see browser incompatibilities. This is not an exhaustive list but rather the scenarios you re most likely to encounter when implementing Ajax techniques. These workarounds should behave as expected in all modern browsers.

#light module ModuleOne let text = "some text" and another module, ModuleTwo.fs, containing the following: #light module ModuleTwo print_endline ModuleOne.text These two modules can be compiled successfully with the following: fsc ModuleOne.fs ModuleTwo.fs -o ModuleScope.exe But the following command: fsc ModuleTwo.fs ModuleOne.fs -o ModuleScope.exe would result in this error message: ModuleTwo.fs(3,17): error: FS0039: The namespace or module 'ModuleOne' is not defined. This is because ModuleOne is used in the definition of ModuleTwo, so ModuleOne must appear before ModuleTwo in the command line, or else ModuleOne will not be in scope for ModuleTwo. Visual Studio users should note that the order in which files appear in Solution Explorer is the order that they are passed to the compiler. This means it is sometimes necessary to spend a few moments rearranging the order of the files when adding a new file to a project.

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Roughly speaking, execution in F# starts at the top of a module and works its way down to the bottom. Any values that are functions are calculated, and any top-level statements are executed. So, the following: module ModuleOne print_endline "This is the first line" print_endline "This is the second" let file = let temp = new System.IO.FileInfo("test.txt") in Printf.printf "File exists: %b\r\n" temp.Exists; temp will give the following result:

At some point in your experiences with Ajax, you re likely to want to append a row to an existing table using JavaScript or to create a new table with rows from scratch. The document.createElement and document.appendChild methods make this easy to do. You just create table cells using document.createElement, and you add the table cells to table rows using document.appendChild. The next logical step is to append the rows to the table using document.appendChild. This works as expected in modern browsers such as Firefox, Safari, and Opera. Using 3565005953993bd3170c41194f12907b Internet Explorer, however, the rows never show up in the table. Worse yet, Internet Explorer

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