Revision for “Access and parse the resource catalogue” created on February 12, 2015 @ 16:33:40
| Title | Access and parse the resource catalogue |
|---|---|
| Content | <h2>First a short overview of the resource catalogue</h2>
Main page or root of the resource catalogue ex. <code>http://hydra.cnet.se:44441/</code>
<a href="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_root.png"><img class="alignnone size-medium wp-image-494" src="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_root-283x300.png" alt="RC_root" width="283" height="300" /></a>
List of actions <code>http://hydra.cnet.se:44441/services/catalogue/actions </code>
<a href="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_listActions.png"><img class="alignnone size-medium wp-image-496" src="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_listActions-270x300.png" alt="RC_listActions" width="270" height="300" /></a>
List of access resources <code>http://hydra.cnet.se:44441/IoTresources</code>
<a href="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_resources.png"><img class="alignnone size-medium wp-image-499" src="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_resources-300x213.png" alt="RC_resources" width="300" height="213" /></a>
List of State variables <code>http://hydra.cnet.se:44441/IoTresources/3/services/IoTObservation/statevariables</code>
<a href="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_services.png"><img class="alignnone size-medium wp-image-500" src="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_services-300x143.png" alt="RC_services" width="300" height="143" /></a>
Select a state variable and get latest 180 measurements <code>http://hydra.cnet.se:44441/IoTresources/3/services/IoTObservation/statevariables/currentconsumption?take=180</code>
<a href="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_measurements.png"><img class="alignnone size-medium wp-image-501" src="http://www.iotworldservices.com/wp-content/uploads/2015/01/RC_measurements-300x163.png" alt="RC_measurements" width="300" height="163" /></a>
<h2>Read xml with Javascript</h2>
<code>
function readXml(url) {
var xhr = createCORSRequest('GET', url);
if (!xhr) {
console.log('CORS not supported');
return;
}</code>
// Response handlers.
xhr.onload = function () {
var xml = xhr.responseText;
if (typeof firstAction !== 'undefined') {
console.log(xml);
}
};
xhr.onerror = function () {
console.log('Woops, there was an error making the request.');
};
xhr.send();
}
function createCORSRequest(method, url) {
var xhr = new XMLHttpRequest();
if ("withCredentials" in xhr) {
// XHR for Chrome/Firefox/Opera/Safari.
xhr.open(method, url, true);
} else if (typeof XDomainRequest != "undefined") {
// XDomainRequest for IE.
xhr = new XDomainRequest();
xhr.open(method, url);
} else {
// CORS not supported.
xhr = null;
}
return xhr;
}
Ex.
<code>readXml('http://hydra.cnet.se:44441/services/catalogue/actions')</code> |
| Excerpt |