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POJSP + Ajax not working
 

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    <p>Objective: If I type an email id, in the html form it has to send the request to jsp where it does the logic and has to print(in the html form) whether the email is available or not. I have the following code. Please do help me which part I am doing wrong.</p> <p><strong>CreateAccount.html</strong></p> <pre><code>&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;script type="text/javascript" src="emailStore.js"&gt;&lt;/script&gt; &lt;/head&gt; &lt;body onload="process()"&gt; &lt;form name="login"&gt; &lt;table align="center"&gt; &lt;tr&gt; &lt;td&gt;Email*&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="userinput" id="userinput"/&gt;&lt;/td&gt; &lt;td&gt;&lt;div id = "underInput"&gt;&lt;/div&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Password*&lt;/td&gt; &lt;td&gt;&lt;input type="password" name="pswrd" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Repeat Password*&lt;/td&gt; &lt;td&gt;&lt;input type="password" name="pswrd1" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;First Name*&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="userid" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Last Name*&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="userid" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;tr&gt; &lt;td&gt;Phone Number&lt;/td&gt; &lt;td&gt;&lt;input type="text" name="userid" /&gt;&lt;/td&gt; &lt;/tr&gt; &lt;/table&gt; &lt;div style="text-align: center"&gt; &lt;input type="submit" value="Create Account"/&gt; &lt;/div&gt; &lt;/form&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>The ajax part in a javascript file. <strong>emailStore.js</strong></p> <pre><code>var xmlHttp = createXmlHttpRequestObject(); function createXmlHttpRequest() { var xmlHttp; if(window.ActiveXObject) { try { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) { xmlHttp = false; } } else { try { xmlHttp = new ActiveXObject(); } catch(e) { xmlHttp = false; } } if(!xmlHttp) { alert("can't create that object"); } else { return xmlHttp; } } function process() { if(xmlHttp.readyState==0 || xmlHttp.readyState==4) { email = encodeURIComponent(document.getElementById("userinput").value); xmlHttp.open("GET", "emailStore.jsp?email=" + email, true); xml.onreadystatechange = handle.ServerResponse; xmlHttp.send(null); } else { setTimeout('process()', 1000); } } function handleServerResponse() { if(xmlHttp.readyState==4) { if(xmlHttp.status==200) { xmlResponse = xmlHttp.responseXML; xmlDocumentElement = xmlResponse.documentElement; message = xmlDocumentElement.firstChild.data; document.getElementById("underInput").innerHTML = '&lt;span style = "color:blue"&gt;' + message + '&lt;/span&gt;'; setTimeout('process()',1000); } else { alert('Something went Wrong'); } } } </code></pre> <p>And the logic part in a jsp file- <strong>emailStore.jsp</strong></p> <pre><code>&lt;%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%&gt; &lt;%@ page import="java.util.ArrayList"%&gt; &lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt; &lt;html&gt; &lt;head&gt; &lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt; &lt;title&gt;Insert title here&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;% String email = request.getParameter("userinput"); ArrayList&lt;String&gt; emails = new ArrayList&lt;String&gt;(); emails.add("something@gmail.com"); if (emails.contains(email)) { out.println("Email already taken!"); } else { out.println("Email available"); } %&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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    1. COWhat is meant by not working ? Pls share any exception , it is a lengthy code.
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    2. CODoes not throw any exception. But it is not working correctly.
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    3. COif you don't need HTML in the response you shouldn't be using a JSP in the first place. Pls don't write Java code in JSP , use a Servlet.
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