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Reading an XML file using JavaScript

Reads an xml file using JavaScript from a web page. Files used: loadxml.js (main script), readxml.js (client script), and readxml.html. The code for loadxml.js was copied from the article JavaScript and XML [devarticles.com]

file: loadxml.js
  XML.load = function(url) {
    var xmldoc = XML.newDocument();
    xmldoc.async = false;  
    xmldoc.load(url);
    return xmldoc;  
  };


XML.newDocument = function(rootTagName, namespaceURL) {
    if (!rootTagName) rootTagName = "";
    if (!namespaceURL) namespaceURL = "";

    if (document.implementation && document.implementation.createDocument) {
        // This is the W3C standard way to do it
        return document.implementation.createDocument(namespaceURL, 
                       rootTagName, null);
    }
    else { // This is the IE way to do it
        // Create an empty document as an ActiveX object
        // If there is no root element, this is all we have to do
        var doc = new ActiveXObject("MSXML2.DOMDocument");

        // If there is a root tag, initialize the document
        if (rootTagName) {
            // Look for a namespace prefix
            var prefix = "";
            var tagname = rootTagName;
            var p = rootTagName.indexOf(':');
            if (p != -1) {
                prefix = rootTagName.substring(0, p);
                tagname = rootTagName.substring(p+1);
            }

            // If we have a namespace, we must have a namespace prefix
            // If we don't have a namespace, we discard any prefix
            if (namespaceURL) {
                if (!prefix) prefix = "a0"; // What Firefox uses
            }
            else prefix = "";

            // Create the root element (with optional namespace) as a
            // string of text
            var text = "<" + (prefix?(prefix+":"):"") + tagname +
                (namespaceURL
                 ?(" xmlns:" + prefix + '="' + namespaceURL +'"')
                 :"") +
                "/>";
            // And parse that text into the empty document
            doc.loadXML(text);
        }
        return doc;
    }
};


file: readxml.js
function readXmlFile() {
  url = 'http://rorbuilder.info/pl/test123';

  doc = XML.load(url);
  alert(doc.documentElement.firstChild.nextSibling.firstChild.nodeValue);
}


file: readxml.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  <head>
    <title>Read an XML file</title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
    <script type="text/javascript" src="js/loadxml.js"/>
    <script type="text/javascript" src="js/readxml.js"/>
  </head>

  <body>
    <h1>ReadXML</h1>
    <p>
       If all goes well you should see an alert box display the message 'testing 123'
   </p>
    <p>Press the 'go' button to read the xml file '<a href="test123">test123</a>' 
       from the web server. 
       <input type="button" onclick="readXmlFile()" value="go"/>
    </p>

    
  </body>
</html>


Note: To avoid the cross-site security error message 'permission denied', store all the files on the same web server.

To test the above code try out the demo to read the xml file [rorbuilder.info].
to html javascript xml read load document by jrobertson on Feb 02, 2008

read-url-with-basic-auth

read-url-with-basic-auth: func [url key] [
    read/custom url compose/deep [
        header [Authorization: (join "Basic " key)]
    ]

]
to http read REBOL auth read-url-with-basic-auth by gregg.irwin on May 16, 2006

load a CSV file

    read-csv: func [
        "Load and parse a delimited text file."
        file [file!]
        /with
            delimiter
        /local lines
    ][
        if not with [delimiter: ","]
        lines: read/lines file
        forall lines [
            change/only lines parse/all first lines delimiter
        ]
        ; head lines  ;<- needed for View < 1.3
    ]
to file read csv REBOL read-CSV by gregg.irwin on Jan 22, 2006

PHP READ TAB SEPARATED FILE

// OPENS A TAB SEPARATED FILE
// PUTS DATA INTO AN ARRAY AND SPLITS IT BY TAB
// LOOPS THROUGH CODE AND PRINT

<?php

$filename = "Book1.txt";
$fd = fopen($filename,"r");
$contents = fread ($fd,filesize ($filename));
fclose($fd);

$splitcontents = explode(" ", $contents);
$counter = 0;

foreach($splitcontents as $data){
	echo $counter++;
	echo ":  " . $data;
	}


?>
to php file read by smartcookie on Dec 22, 2005

Reading bytes value

from struct import unpack
f = open('data.bin', 'rb')

b = f.read(1)
b2 = f.read(2)
b4 = f.read(4)

n = ord(b)  # from char to int
n4 = unpack('>L', b4)  # big endian
n4 = unpack('<L', b4)  # little endian
n = unpack('>h', b2)   # big endian short
to python file read unpack endian by korakot on Sep 18, 2005
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