barcode vb.net Ajax: A Beginner s Guide in Java

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Ajax: A Beginner s Guide
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In the getData function, we can create an XMLHttpRequest object:
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<script language = "javascript"> function getData() { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); XMLHttpRequestObjectoverrideMimeType("text/xml"); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } } </script>
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Then we can use that XMLHttpRequest object to download partyxml using Ajax, get partyxml in JavaScript XML object form from the XMLHttpRequest object s responseXML property, and pass that XML object on to another function named displayGuest:
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<script language = "javascript"> function getData() { var XMLHttpRequestObject = false; if (windowXMLHttpRequest) { XMLHttpRequestObject = new XMLHttpRequest(); XMLHttpRequestObjectoverrideMimeType("text/xml"); } else if (windowActiveXObject) { XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); } if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partyxml", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML;
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displayGuest(xmlDocument); } } XMLHttpRequestObjectsend(null); } } </script>
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Handling XML in Ajax
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OK, now we ve passed the XML object containing the XML data we want to work with to a function named displayGuest:
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<script language = "javascript"> function displayGuest (xmldoc) { } </script>
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We start navigating through the XML document to the third guest by getting the document element for partyxml:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode; partiesNode = xmldocdocumentElement; } </script>
Okay, now that we ve got the document element, how do we navigate to the third guest We use navigation properties like these, which are supported by all element node objects (including the document element node):
childNodes firstChild lastChild nextSibling previousSibling Array of child nodes First child node Last child node Next sibling node Previous sibling node
Ajax: A Beginner s Guide
For example, the <party> element node is the first (and only) child of the <parties> node:
< xml version="10" > <parties> <party type="winter"> <party_title>Snow Day</party_title> <party_number>63</party_number> <subject>No school today!</subject> <date>2/2/2009</date> <people> <person attendance="present"> <first_name>Ralph</first_name> <last_name>Kramden</last_name> <person attendance="absent"> </person> <first_name>Alice</first_name> <last_name>Kramden</last_name> </person> <person attendance="present"> <first_name>Ed</first_name> <last_name>Norton</last_name> </person> </people> </party> </parties>
Since we have an object corresponding to the <parties> document element node already (partiesNode), we can access the <party> child node like this in the displayGuest function:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode, partyNode; partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; } </script>
The third guest is stored inside the <people> element, and the <people> element is the last child element of the <party> element, so we can access it with the <party> element s lastChild property:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode, partyNode, peopleNode; var firstNameNode, lastNameNode, displayText;
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partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; peopleNode = partyNodelastChild; } </script>
Handling XML in Ajax
Now we ve reached the <people> element The <person> element we re interested in is the last child of the <people> element, so we can access that third <person> node like this:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode, partyNode, peopleNode; var firstNameNode, lastNameNode, displayText; partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; peopleNode = partyNodelastChild; personNode = peopleNodelastChild; } </script>
Almost there Now we have to access the <first_name> and <last_name> elements inside the <person> element The <first_name> element is the first child of the <person> element, so we grab it like this:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode, partyNode, peopleNode; var firstNameNode, lastNameNode, displayText; partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; peopleNode = partyNodelastChild; personNode = peopleNodelastChild; firstNameNode = personNodefirstChild; } </script>
Ajax: A Beginner s Guide
The <last_name> element is the last child of the <person> element, so we could use the lastChild property of the personNode object to access it, but for variety, noting that the <last_name> element is a sibling of (that is, an element on the same level as) the <first_name> node, we can also access the <last_name> element as using the <first_name> element s nextSibling property:
<script language = "javascript"> function displayGuest (xmldoc) { var partiesNode, partyNode, peopleNode; var firstNameNode, lastNameNode, displayText; partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; peopleNode = partyNodelastChild; personNode = peopleNodelastChild; firstNameNode = personNodefirstChild; lastNameNode = firstNameNodenextSibling; } </script>
Whew Now we ve got two objects corresponding to the <first_name> and <last_name> elements firstNameNode and lastNameNode It took some effort to get here, but we got those objects So how do you extract the actual guest s name from the <first_name> and <last_name> elements The first and last names are stored as text nodes inside these elements:
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