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associatedLabel = inputs[i].getLabel(); if(associatedLabel != null) { inputs[i].removeClass("validationFail"); inputs[i].addClass("validationPass"); associatedLabel.innerText = ""; associatedLabel.removeClass("validationFail"); associatedLabel.addClass("validationPass"); } } catch(ex) { } } } } // Return the overall validation status return isOk; } // Customize the DOM by accessing HTMLDocument's // prototype and extend its functionality // to include the validate() method. HTMLDocument.prototype.validate = validate; </script> The function begins by looping through each of the validation selectors. For each selector, validate() queries the document object for all child elements using the current selector through document.querySelectorAll(). A secondary loop begins, iterating over the results of that function call; text content of matching elements are compared to the regular expression associated with the current validation selector. If the validation pattern is matched, the form element and its associated label denote success. If a match is not found, a CSS class for failure is applied to the element, and an error notification is written to the element s label. The validate() function is applied to the HTMLDocument object, allowing it to be accessed anywhere in the document context through document.validate(). The final step in this example consists of linking the validation prototypes with the target form. Listing 6 22 shows two parts to this: the document.validate() function is called by a form submission handler, submitForm(), which is set as the target form s action. Listing 6 22. Function Handling Form Submission and Updated Form Action Referring to It <script type="text/javascript"> // Function that calls validation on the document object function submitForm() { // Validate forms in the document document.validate(); } </script> <!-- ... -->

XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant", new XAttribute("type", "Author"), new XElement("FirstName", "Joe"), new XElement("LastName", "Rattz")), new XElement("BookParticipant", new XAttribute("type", "Editor"),

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new XElement("FirstName", "Ewan"), new XElement("LastName", "Buckingham")))); IEnumerable<XElement> elements = xDocument.Element("BookParticipants").Descendants("FirstName"); // First, we will display the source elements. foreach (XElement element in elements) { Console.WriteLine("Source element: {0} : value = {1}", element.Name, element.Value); } // Now, we will display the ancestor elements for each source element. foreach (XElement element in elements.AncestorsAndSelf()) { Console.WriteLine("Ancestor element: {0}", element.Name); } Just as with the first Ancestors prototype, first we create an XML document. Next, we generate a sequence of FirstName elements. Remember, this AncestorsAndSelf method is called on a sequence of elements, not on a single element, so we need a sequence on which to call it. We then enumerate through the sequence displaying the source elements just so we can see the source sequence. Then, we enumerate on the elements returned from the AncestorsAndSelf method and display them. If this works as we expect, the results should be the same as the results from the first Ancestors prototype s example, except now the FirstName elements should be included in the output. Here are the results: Source element: FirstName : value = Joe Source element: FirstName : value = Ewan Ancestor element: FirstName Ancestor element: BookParticipant Ancestor element: BookParticipants Ancestor element: FirstName Ancestor element: BookParticipant Ancestor element: BookParticipants For an example of the second AncestorsAndSelf prototype, we will use the same basic example that we used in the example for the second Ancestors prototype, except, of course, we will change the call from the Ancestors method to the AncestorsAndSelf method, as shown in Listing 8-6.

Integrity constraint violation Invalid cursor state Invalid transaction state Invalid SQL statement name Triggered data change violation Invalid authorization specification

XDocument xDocument = new XDocument( new XElement("BookParticipants", new XElement("BookParticipant",

<span class="label">Name:</span><br /> <input type="text" id="name" name="name" class="text validateName" /><br /> Validation methods on this form are now defined, with validation occurring every time a user submits the form. Figure 6 5 shows a running example of the validation engine.

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int ExecuteCommand(string command, params object[] parameters) This method accepts a command string and zero or more optional parameters and returns an integer indicating how many rows were affected by the query. Be aware that if you specify the value of a column for a where clause in the command string itself, you must enclose char-based type columns with single quotes just as you would if you were making a normal SQL query. But, if you provide the column s value as a parameter, there is no need to enclose the parameter specifier, such as {0}, in single quotes.

In Listing 16-22, we will insert a record using the ExecuteCommand method. Since we always reverse any changes we make to the database so subsequent examples are not affected, we will also use the ExecuteCommand method to delete the inserted record.

CHAPTER 11 INTRODUCING JAVA DATABASE CONNECTIVITY (JDBC)

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