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Now let s look at the implementation details of the HTML form again, as one additional change has not yet been discussed, and it needs to be covered before discussing the details of GetState or SetState: <form id="calculator"> <table border="1"> <tr> <td>Number 1</td><td><input type="text" name="Number1" /> <br><span id="Number1Error"></span></td> </tr> <tr> <td>Number 2</td><td><input type="text" name="Number2" /> <br><span id="Number2Error"></span></td> </tr> <tr> <td>Result</td><td><span id="result"></span> <br><span id="resulterror"></span></td> </tr> <tr> <td colspan="2"> <center> <input type="button" value="Add the two numbers" onclick=""/> </center> </td> </tr> </table> </form> The bold text shows the addition of HTML span elements, which you use to display any errors associated with the data. In past applications, you might have used a dialog box to indicate errors. The problem with dialog boxes is that they talk about the problematic data but don t pinpoint it. With a fairly complex form, users might be left wondering where the error is. Dynamic HTML (DHTML) gives you the ability to modify the HTML elements, thus making the need to use a dialog box unnecessary. This recipe uses an HTML span element that contains the error. You can use whatever you want in your applications. Maybe you want to use blinking text, or maybe you want to change fonts it s your choice. It s important, though, that you associate the error with the local HTML element. Now let s cover the details of GetState, which can be a bit lengthy: function GetState(identifier, cb) { if (identifier == "toadd") { // 1 var form = document.getElementById("calculator"); document.getElementById("Number1Error").innerHTML = ""; // 2 document.getElementById("Number2Error").innerHTML = ""; var obj = new Object(); // 3 var didError = false; // 4
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try { obj.Number1 = Converter.convertToInteger(form.Number1.value); // 5 } catch( e) { didError = true; document.getElementById("Number1Error").innerHTML = e.toString(); if (cb.error) { cb.error({ section : "toadd", item: "Number1", error : e.toString()}); // 6 } } try { obj.Number2 = Converter.convertToInteger(form.Number2.value); } catch( e) { didError = true; document.getElementById("Number2Error").innerHTML = e.toString(); if (cb.error) { cb.error({section: "toadd", item: "Number2", error: e.toString()}); } } if (cb.state && !didError) { cb.state({ section: "toadd", value : obj}); // 7 } } else if (identifier == "result") { var element = Navigation.findChild("calculator", "result"); Navigation.findChild("calculator", "resulterror").innerHTML = ""; var obj = new Object(); try { obj.Result = Converter.convertToInteger(element.innerHTML); } catch( e) { Navigation.findChild("calculator", "resulterror").innerHTML = e.toString(); if (cb.error) { cb.error({section: "Result", item : "Result", error: e.toString()}); } return; } if (cb.state) { cb.state({ section : "result", value : obj}); } }
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else { if (cb.error) { cb.error({section: identifier, error: "State identifier (" + identifier + "does not exist"}); } } } The code is not complicated but lengthy, because the task you need to accomplish is lengthy. The following list explains each of the bold lines of code. The numbers in the list correspond to the numbers in the comments displayed in the highlighted code: 1. GetState makes a decision to determine which representation should be converted into a state. 2. GetState resets the error messages associated with the representation. In this recipe, that means assigning the innerHTML property of the individual HTML span elements to an empty buffer. In your application, that might mean the resetting the blinking text or changing the text font. It s important to reset the error state so that no old errors are displayed as the validation is being executed. 3. GetState instantiates an object using the Object type. The instantiation and use of the Object type has a purpose. You might be tempted to instantiate a type that has predefined data members and methods, but that is not advised. Imagine using DHTML and generating a form dynamically. It could be that one context of the generated form has a data member, and another context does not. From a state perspective, you want to know the state that reflects the context, not what you think the context should be. Thus, when you instantiate an Object that has no data members and you assign the data members dynamically, you re ensuring only that the data associated with the context is present. 4. The variable didError is a flag that indicates whether a validation error occurred. This flag is highlighted here to cross-reference the previous discussion regarding the reason of using callbacks and not loops. The illustration of didError shows that the GetState algorithm needs to track whether an error occurred. 5. Converter converts the HTML data into the requested type, which in the case of the example is an integer value. The conversion is a function call that varies with the application being written. The conversion includes a validation. Note that the conversion is encapsulated within an exception block. The use of an exception block is preferred, because all errors will be caught. The validation routines might miss some errors, but the exception block can capture and display those errors. 6. If an exception is generated, the catch block captures the exception. Once the exception has been captured, the user-defined error callback is called and can process the error further. 7. If no errors are generated, the user-defined callback is called with the state of the form. The code that is not bold is either a replication of the functionality or support code for one of the seven details. Remember that the GetState and SetState functionalities are
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