Summary You can see whether there s been an error loading a document by checking the parseError in Font

Drawing PDF 417 in Font Summary You can see whether there s been an error loading a document by checking the parseError

Summary You can see whether there s been an error loading a document by checking the parseError
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property of the Document object, and get a detailed error message using Sarissa.getParseErrorText().
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CHAPTER 15 DYNAMIC XSLT
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Performing Transformations
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Having a Document object for the stylesheet does not immediately enable you to transform the XML document using the stylesheet. Creating the Document object for the stylesheet reads in the stylesheet as an XML document like any other. Now you need to tell the XSLT processor to consider the stylesheet as an XSLT stylesheet, to compile it to create some runnable code that can be used against the XML document to create a result.
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Creating a Compiled Stylesheet
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In Sarissa, XSLTProcessor objects hold the result of compiling a stylesheet DOM, which can be used to perform multiple transformations. You need to create an XSLTProcessor object: var xslProcessor = new XSLTProcessor(); There s only one thing you need to do to configure the XSLTProcessor object, and that s to import the stylesheet DOM: xslProcessor.importStylesheet(xslDOM); When you import the stylesheet into the XSLTProcessor object, the processor checks the stylesheet to make sure that it s valid. For example, it checks that all the XSLT elements are arranged in the way that they should be and that the XPaths that you use follow the XPath syntax. If there s anything wrong with the way that your stylesheet is constructed, importing the stylesheet raises an exception, which will be displayed to the user as a JavaScript error if it s not caught.
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Note In Firefox, the error is raised when you actually try to perform a transformation using the invalid
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stylesheet; either way, you need to catch it.
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You can catch this error using a try-catch statement around the part of your code where you import the stylesheet into the XSLTProcessor object. If you wish, you can display the cause of the exception using the description property of the exception. For example: try { var xslProcessor = new XSLTProcessor(); xslProcessor.importStylesheet(xslDOM); ... } catch (exception) { alert(exception.description); }
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Summary To run a stylesheet, you need to create an XSLTProcessor object and import the stylesheet
with its importStylesheet() method.
CHAPTER 15 DYNAMIC XSLT
Doing the Transformation
Once you ve created the XSLTProcessor object, you need to transform the source document into a result document with the transformToDocument() method, with var resultDOM = xslProcessor.transformToDocument(xmlDOM);
Caution To work in Internet Explorer, the result of the transformation must be a well-formed document.
Most importantly, that means it can only have one document element.
Running the transformation can also cause exceptions to be raised, if, for example, you try within the stylesheet to treat a string as a node set or to access an inaccessible document using the document() function. Again, then, you should wrap the code enacting the transformation within a try-catch statement, which could be the same as the one that you use when importing the stylesheet into the XSLTProcessor object: try { var xslProcessor = new XSLTProcessor(); xslProcessor.importStylesheet(xslDOM); var resultDOM = xslProcessor.transformToDocument(xmlDOM); ... } catch (exception) { alert(exception.description); }
Summary To run a transformation, call the transformToDocument() method on the XSLTProcessor
object, which results in a new Document object.
Handling Output
You can simply serialize the result of your transformation (or indeed any Document object) with the Sarissa.serialize() method. This results in a string that you can then put in an alert box or write to the document: document.write(Sarissa.serialize(resultDOM)); However, there are a couple of other ways of handling the output of the transformation that make better use of the fact you re doing the transformation dynamically and on the client side.
Replacing Part of the Page
It s often handy to only replace a part of the HTML with the result of the transformation, in particular because this allows you to reuse the same Document and XSLTProcessor objects multiple times.
CHAPTER 15 DYNAMIC XSLT
You can replace the content of a particular element with the content of a document using the Sarissa.updateContentFromNode() method that s included in the sarissa_dhtml.js library. This normally takes two arguments: the Document object whose content you want to use and the element in which you want to put it. For example, if you have the following HTML document containing the script that s performing the transformation: <html> <head> <title>TV Listing</title> <script type="text/javascript" href="sarissa.js"> </script> <script type="text/javascript" href="sarissa_dhtml.js"> </script> <script type="text/javascript"> ... your code ... </script> </head> <body id="result"> </body> </html> then you can load the result of the transformation into the <body> element with Sarissa.updateContentFromNode(resultDOM, result); Sarissa also offers a slight shortcut, in that you can give an optional third argument that specifies an XSLTProcessor object that s used to transform the Document object given as the first argument. So you can also do the following: Sarissa.updateContentFromNode(xmlDOM, result, xslProcessor); Even quicker, the Sarissa.updateContentFromURI() method accepts a URI for an XML document as the first argument, but otherwise works in the same way: Sarissa.updateContentFromURI('TVGuide.xml', result, xslProcessor); though note that this method doesn t allow you to reuse the XML document in different transformations as efficiently as reusing the Document object. If you use this method, remember to make sure that the stylesheet generates something that can be placed in the content of the element that you re using. For example, the stylesheet shouldn t generate an <html> element if you re replacing the content of the <body> element.
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