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POHow to execute an ajax function everytime there is a change in the servlet?
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  1. POHow to execute an ajax function everytime there is a change in the servlet?
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    copied!<p>I want to enable the button when a USB is inserted and disable it when the USB is removed. How can I use ajax to change the button everytime the USB is inserted or removed?</p> <p>Ajax</p> <pre><code>function loadXML(){ var xmlhttp; if (window.XMLHttpRequest) { xmlhttp = new XMLHttpRequest(); } else { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 &amp;&amp; xmlhttp.status==200) { alert (xmlhttp.responseText); if(xmlhttp.responseText == "true") { document.getElementById('scan').disabled=false; } else { document.getElementById('scan').disabled=true; } } } xmlhttp.open("GET", "ScanJobServlet", true); xmlhttp.send(); } </code></pre> <p>Servlet- How can I resend the response to JSP everytime the event listener is triggered and perform the ajax function again?</p> <pre><code> public static boolean status = false; protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // TODO Auto-generated method stub //super.doGet(req, resp); PrintWriter out = resp.getWriter(); RemovableStorageEventListener listener = new RemovableStorageEventListener() { public void inserted(Storage storage) { status = true; } public void removed(Storage storage) { status = false; } }; BundleContext bc = AppManager.getInstance().getBundleContext(); StorageManager sm = StorageManager.getInstance(KSFUtility.getInstance().getApplicationContext(bc)); sm.addListener(listener); if (status==true) { out.print("true"); } else { resp.reset(); } } </code></pre>
 

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