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CHAPTER 9 STATE NAVIGATION PATTERN
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else if( element.nodeName == "element") { if( objData.formNode != null) { var elementIdentifier = element.attributes.getNamedItem( "id").nodeValue; if( element.childNodes[ 0] != null) { var elementValue = element.childNodes[ 0].nodeValue; objData.formNode.elements[ elementIdentifier].value = elementValue; } } } } }, loadForm : function( xmlState) { this.verify = this.extractFormData; var objData = new Object(); XMLIterateElements( this, objData, xmlState); }, The implementation of the method loadForm is relatively Spartan, and is used to prepare the iteration of the XML file by using the standard function XMLIterateElements and the userdefined function extractFormData. The assignment of the this.verify method is used to determine whether an iterated XML element is of interest to the user. The creation of the EBVN objData variable is required for the function XMLIterateElements and will contain the found data. The combination of objData and the this.verify method deserialize XML content into JavaScript data members. The function XMLIterateElements is used to process an XML file and is implemented as follows: function XMLIterateElements( objVerify, objData, element) { objVerify.verify( element, objData); for( var i = 0; i < element.childNodes.length; i ++) { XMLIterateElements( objVerify, objData, element.childNodes[ i]); } } The function XMLIterateElements has three parameters. The parameter objVerify is an object instance that is called to process an XML element. The parameter objData is a data object that is manipulated by the objVerify.verify method. An object instance is used so that a verify implementation can access the data members of a current object instance. The parameter element represents an XML node. After having called the objVerify.verify method, the child nodes of the element XML node are iterated, and for every iteration the function XMLIterateElements is called recursively. The result is that for each and every element, the method objVerify.verify is called. The purpose of objData is to allow the method objVerify. verify to assign some data members that can be referenced at some later point, during and after the iteration of all the XML elements. Let s look back at the implementation of loadForm. Notice that it is calling the function XMLIterateElements and that the objVerify.verify method refers to the method extractFormData. Looking at the implementation of extractFormData, you can see that a
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number of XML DOM methods (for example, element.[example method]) are called. What happens in the extractFormData method is that the XML elements form and element are searched for. If a form XML element is found, it is a reference to an HTML form that is retrieved from the current HTML page by using the method document.forms[objData.formId]. The HTML form reference is needed to assign individual HTML form elements. If an element XML element is found, the value is assigned by retrieving the identifier from the XML attribute (element.attributes.getNamedItem("id").nodeValue) and the child value (element. childNodes[0].nodeValue). The form element is assigned the value by using the reference objData.formNode.elements[elementIdentifier].value = elementValue. In the example, there is no attempt made to test whether the HTML element is a check box or list box. This was done on purpose to keep the explanation simple, and in the complete implementation of extractFormData those additional attributes would be tested. The method loadState is used to begin the HTML page-loading process and is defined as follows: loadState : function() { if( location.hash != null) { var asynch = new Asynchronous(); var thisReference = this; asynch.openCallback = function( xmlhttp) { if( location.hash.length == 0) { xmlhttp.setRequestHeader( thisReference.constPageStateHeader, "none"); EBVN } else { xmlhttp.setRequestHeader( thisReference.constPageStateHeader, location.hash.slice(1)); } xmlhttp.setRequestHeader( "Accept", thisReference.constResourceStateContentType); thisReference.verifyWindowName(); xmlhttp.setRequestHeader( thisReference.constPageWindowName, window.name); } var xmlhttp = asynch._xmlhttp; asynch.complete = function( status, statusText, responseText, responseXML) { thisReference.verify = thisReference.extractUserData; var objData = new Object(); XMLIterateElements( thisReference, objData, responseXML); if( objData.foundElement) { thisReference.onLoadState( status, objData.foundElement); } location.replace( location.pathname + "#" + xmlhttp.getResponseHeader( thisReference.constPageStateHeader)); }
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