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This solution involves creating a JavaScript delegate, as illustrated by the following source code. Source: /website/ROOT/ajaxrecipes/javascript/functionsareobjects.html <html> <head> <title>Implementing an Error Handling Strategy</title> <script language="JavaScript" src="/scripts/jaxson/common.js"></script>
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<script language="JavaScript" src="/scripts/jaxson/commontest.js"></script> <script language="javascript" src="/scripts/jsunit/jsUnitCore.js"></script> </head> <script language="javascript"> ops.delegate(window, "onload", function() { window.onerror = function(msg, file, location) { info("window.onerror2", "Msg (" + msg + ") file (" + file + ") location (" + location + ")"); } }); </script> <body> In the modified onload implementation, the ops.delegate function is used to create a delegate. For the moment, think of a delegate as a way to have a single method call result in multiple methods being called. (You can find more details about delegates in Recipe 2-17.) The implementation of ops.delegate will test if a function is already is assigned to window.onload. If a function is assigned, then the existing function is converted to a delegate method, and the new function is associated with the delegate. Then when the browser calls window.onload, it will call both the original function and the new function. In theory, an infinite number of functions can be associated with a delegate. The important thing to remember is that multiple functions can be associated with a single property, which is required for the window.onload method. The following code tests the error handling routine: var testsToRun = { throw_exception : function() { throw new Error("this is an error"); } }; When the throw_exception function is called, an exception is generated by instantiating the Error object and then throwing it using the throw keyword. In theory, you can throw any object even one that looks like Error. Of course, using Error in this way is the most efficient choice, and this in essence is the basis of your error handling framework. You need something to capture an error, and you need to throw an error. How you capture and process the error is context-specific, so showing you something I or another programmer has implemented in another application is not going to help you here. Another way to capture an error is through an exception handler, as follows: function Generate() { throw new Error(); } function CatchAll() { try { Generate(); } catch( e) { // Do something with error throw e; } }
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In this example are two functions: Generate and CatchAll. Generate is used to generate an exception, and CatchAll is used to capture the exception. In JavaScript, you can capture an exception using the try and catch keywords, which catch all errors and exceptions that occur while the code in the try block is executing. When an exception is generated, the code within the catch block is executed. In the example, the error is generated by Generate and caught by the catch block, which then throws the error. When the error is thrown again, the exception will be caught in the window.onload method. The try and catch block is extremely useful, because all errors and exceptions can be caught without the browser being any the wiser. But having a catchall mechanism can make debugging JavaScript more complicated, because errors that occur are processed without having the developer be any the wiser. You might be tempted to use a try and catch block as a general programming technique, but that would be a bad idea. An error that is thrown is an exception, and an exception is something that should not have happened and is unpredictable. An exception should never happen, whereas an error could happen. The best way to illustrate the difference between and error and an exception is the following example, which shows how an exception can be used to capture an error.
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Note This example could have written more succinctly using other keywords, but the point here is to
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simply show the difference between using a decision to test for an undefined variable and using an exception that executes if the variable happens to be undefined.
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var func; try { func(); } catch( e) { func = Default; func(); } The exception example illustrates how an exception handler (try and catch keywords) can be used to catch an exception if the func variable is not assigned to a method. Calling func will generate an exception and trigger the code in the catch block. In the catch block of the exception, the variable func is assigned a default function that works and is called. Using an exception block in this manner is incorrect, because the code as it is written expects that func might not be assigned. If there is an expectation of func not being assigned, then the code should be written to reflect that. A better way to write the same code is as follows: var func; if( typeof(func) != "function") { func = Default; } func();
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