barcode vb.net Handling XML in Ajax in Java

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Handling XML in Ajax
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firstNameNode = personNodefirstChild; lastNameNode = firstNameNodenextSibling; attributes = personNodeattributes attendancePerson = attributesgetNamedItem("attendance"); var displayText = firstNameNodefirstChildnodeValue + ' ' + lastNameNodefirstChildnodeValue + " was " + attendancePersonnodeValue;
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var target = documentgetElementById("targetDiv"); targetinnerHTML=displayText; } function removeWhitespace(xml) { var loopIndex; for (loopIndex = 0; loopIndex < xmlchildNodeslength; loopIndex++) { var currentNode = xmlchildNodes[loopIndex]; if (currentNodenodeType == 1) { removeWhitespace(currentNode); } if (((/^\s+$/test(currentNodenodeValue))) && (currentNodenodeType == 3)) { xmlremoveChild(xmlchildNodes[loopIndex--]); } } } </script> </head> <body> <h1>Accessing Data in XML Attributes</h1> <form> <input type = "button" value = "Get the third guest's attendance" onclick = "getData()"> </form> <div id="targetDiv" width =100 height=100> Was the third guest present </div> </body> </html>
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Ajax: A Beginner s Guide
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You can see attributeshtml at work in Figure 6-5, where it s reporting that the third guest, Ed Norton, was present Excellent
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Validating Your XML
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The final XML topic for this chapter is how to validate your XML As discussed earlier in this chapter, you can specify the syntax of your XML documents and test to see whether or not it adheres to your rules There are two methods of specifying an XML document s syntax: with XML Schema, and with a DTD Unfortunately, support for schema is shaky to nonexistent in browsers even Internet Explorer s support for schema is very shaky So in this example, we ll stick with the older form of specifying XML syntax, DTDs We saw what the DTD for partyxml looked like earlier in this chapter, and we ll call the document that includes the DTD for partyxml, partydtdxml:
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< xml version="10" > <!DOCTYPE parties [ <!ELEMENT parties (party*)> <!ELEMENT party (party_title, party_number, subject, date, people*)> <!ELEMENT party_title (#PCDATA)> <!ELEMENT party_number (#PCDATA)> <!ELEMENT subject (#PCDATA)> <!ELEMENT date (#PCDATA)> <!ELEMENT first_name (#PCDATA)> <!ELEMENT last_name (#PCDATA)> <!ELEMENT people (person*)> <!ELEMENT person (first_name,last_name)> <!ATTLIST party type CDATA #IMPLIED> <!ATTLIST person attendance CDATA #IMPLIED> ]>
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<parties> <party type="winter"> <party_title>Snow Day</party_title> <party_number>63</party_number> <subject>No school today!</subject> <data>2/2/2009</data> <people> <person attendance="present"> <first_name>Ralph</first_name> <last_name>Kramden</last_name> </person> <person attendance="absent"> <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>
Handling XML in Ajax
Note that there s an error here this document uses a <data> element, not a <date> element, and you can catch that error in browsers like Internet Explorer To check the document s validity, you can create an XML parser object of the MSXML2DOMDocument type in Internet Explorer, which we do in our getData function:
function getData() { var XMLHttpRequestObject = false; XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partydtdxml b=5", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; var parser = new ActiveXObject("MSXML2DOMDocument"); parservalidateOnParse = true; }
Ajax: A Beginner s Guide
Note that you also must set the parser object s validateOnParse property to true to make it actually parse XML Now you can pass the XML you ve downloaded to the parser using its load method like this:
function getData() { var XMLHttpRequestObject = false; XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partydtdxml b=5", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; var parser = new ActiveXObject("MSXML2DOMDocument"); parservalidateOnParse = true; parserload(XMLHttpRequestObjectresponseXML); }
If the parser found an error, the parserparseErrorerrorCode property will be non-zero, and you can report the error like this in a new example (validationhtml):
<html> <head> <title>Validating an XML Document</title> <script language = "javascript"> function getData() { var XMLHttpRequestObject = false; XMLHttpRequestObject = new ActiveXObject("MicrosoftXMLHTTP"); if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", "partydtdxml b=5", true); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML;
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Handling XML in Ajax
var parser = new ActiveXObject("MSXML2DOMDocument"); parservalidateOnParse = true; parserload(XMLHttpRequestObjectresponseXML); var target = documentgetElementById("targetDiv"); if (parserparseErrorerrorCode != 0) { targetinnerText = "Error in " + parserparseErrorurl + " line " + parserparseErrorline + " position " + parserparseErrorlinepos + "\nError source: " + parserparseErrorsrcText + "\n" + parserparseErrorreason + "\n" + "Error: " + parserparseErrorerrorCode; } else { displayGuest(xmlDocument); } } } XMLHttpRequestObjectsend(null); } } function displayGuest(xmldoc) { var partiesNode, partyNode, peopleNode; var firstNameNode, lastNameNode, displayText; partiesNode = xmldocdocumentElement; partyNode = partiesNodefirstChild; peopleNode = partyNodelastChild; personNode = peopleNodelastChild; firstNameNode = personNodefirstChild; lastNameNode = firstNameNodenextSibling; displayText = "The third guest was " + firstNameNodefirstChildnodeValue + ' ' + lastNameNodefirstChildnodeValue; var target = documentgetElementById("targetDiv"); targetinnerHTML=displayText; } </script> </head> <body>
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