how to call servlet from javascript using ajax

Question

I am doing a samall jsp page to search a name enter in text box .. i called javascript function from jsp .. the bello is javascript code

function fncStudsearch()
{
//alert("yes")
var ele=document.getElementById("stdSearch").value;
var xmlhttp;
var strAjUrlData="stdSearch?key="+ele;
//alert(strAjUrlData)
if (window.XMLHttpRequest)
{// code for IE7+, Firefox, Chrome, Opera, Safari
     xmlhttp=new XMLHttpRequest();
}
else
{// code for IE6, IE5
 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
 xmlhttp.onreadystatechange=function()
 {
 if (xmlhttp.readyState==4 && xmlhttp.status==200)
{

}
  else
  {
  alet(xmlhttp.status);
  }
 }
  xmlhttp.open("GET",strAjUrlData,true);
      xmlhttp.send();

  }

I am calling servlet .. and i configured web.xml as follows

   <servlet>  
      <servlet-name>stdSearch</servlet-name>
       <servlet-class>com.slokam.Act.StudentSearch</servlet-class>
  </servlet>

<servlet-mapping>
     <servlet-name>stdSearch</servlet-name>
     <url-pattern>/stdSearch</url-pattern>
</servlet-mapping>

</web-app>

I am unable ti go to servlet class and servlet code i have written is

   public class StudentSearch extends HttpServlet {


   private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub

    String stdkey=request.getParameter("key");
    stdkey="%"+stdkey+"%" ;
    System.out.println(stdkey);
  }
}

please help in this regard how to goto servlet

Have you overridden the doGet() in stdSearch servlet?

user2575725
– user2575725

2014-11-25 13:01:57 +00:00
Commented Nov 25, 2014 at 13:01 — user2575725
– user2575725, Commented Nov 25, 2014 at 13:01
@Arvind sir i just added servlet code also ..

Vikas Reddy
– Vikas Reddy

2014-11-25 15:41:49 +00:00
Commented Nov 25, 2014 at 15:41 — Vikas Reddy
– Vikas Reddy, Commented Nov 25, 2014 at 15:41
how are you invoking this js function fncStudsearch() ?

user2575725
– user2575725

2014-11-26 00:02:46 +00:00
Commented Nov 26, 2014 at 0:02 — user2575725
– user2575725, Commented Nov 26, 2014 at 0:02
using onclick method in jsp

Vikas Reddy
– Vikas Reddy

2014-11-26 02:37:52 +00:00
Commented Nov 26, 2014 at 2:37 — Vikas Reddy
– Vikas Reddy, Commented Nov 26, 2014 at 2:37

Si Kelly · Accepted Answer · 2014-11-26 00:48:52Z

1

If the app is not deployed as the root application on the appserver, you might need the context path in the url you are calling:

var ctx = "${pageContext.request.contextPath}/";
var strAjUrlData=ctx+"stdSearch?key="+ele;

...

This code assumes you are using jsp 2.0 and EL

edited Nov 26, 2014 at 0:48

answered Nov 25, 2014 at 17:01

Si Kelly

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1 Comment

Vikas Reddy Over a year ago

Updated it ..But it is not wotking .. the above same configuration is working with all other projects

Naman Gala · Accepted Answer · 2015-06-11 10:48:15Z

0

Possibly this might help, there is an javascript error:

alet(xmlhttp.status); // you're missing here `r`

alert(xmlhttp.status);

Secondly, you have to print out some contents from servlet, use PrintWriter for that.

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    String stdkey=request.getParameter("key");
    stdkey="%"+stdkey+"%" ;
    // test purpose
    PrintWriter pw = response.getWriter ();
    pw.print(stdkey);
    pw.close();
}

edited Jun 11, 2015 at 10:48

Naman Gala

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answered Nov 26, 2014 at 0:00

user2575725

2 Comments

Vikas Reddy Over a year ago

Tq.. But problem is same

user2575725 Over a year ago

@VikasReddy do you see anything in the browser console, press F12 to open console, then go to net/network tab on the same console, monitor it while making the ajax call, tell us what you see.

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