Calling a java method inside of a JavaScript function

[Gihan Pandigamage]

Friends,
I have a javascript function called test

function test{
var jobDesc =  document.formApplicant.txtJobDescription.value;
//in this line I need to call validate method
}

so I need to call my another java method called 'validate' inside of that javascript. how can I do this?

validate(String str){
return str;
}

Please help...

[Eric Pascarello]

You need to make an Ajax call to call methods on the server.

Eric

[Vishal Shaw]

Hi,

javascript is a client side technology and you cannot access server side methods directly through it. So, you need to use some framework , one of which is ajax, to do your stuff

Vishal

[Eric Pascarello]

Ajax is NOT a framework.

Eric

[Bear Bibeault]

Please read this article to understand how JSP and server-side Java works and why you can;t just make a simple Java call and must use Ajax.

[Vishal Shaw]

Eric Pascarello wrote:Ajax is NOT a framework.

Eric

Ajax is a framework. Please check this and this . There are many more, so I stop here

Vishal

[Paul Clapham]

Vishal Shaw wrote:Ajax is a framework. Please check this...

I checked that. And it says

an Ajax framework is a framework which leverages Ajax

In other words, it completely fails to say that Ajax is a framework. I assume the other links are just as unreliable.

[Vishal Shaw]

Paul Clapham wrote:

Vishal Shaw wrote:Ajax is a framework. Please check this...

I checked that. And it says

an Ajax framework is a framework which leverages Ajax

In other words, it completely fails to say that Ajax is a framework. I assume the other links are just as unreliable.

So please correct me, shall I call it Technology?

Over here, I heard most of them calling it a framework, and I also got the feeling of using a framework while using ajax.

I felt that ajax is a frmework that can be used with a variety of technologies like asp, java etc.

[Bear Bibeault]

Ajax is part of JavaScript. It is not a framework. Often, a framework is used to make Ajax easier to use, but that does not make Ajax itself a framework.

[Vishal Shaw]

Bear Bibeault wrote:Ajax is part of JavaScript. It is not a framework. Often, a framework is used to make Ajax easier to use, but that does not make Ajax itself a framework.

Thanks Bear !!!

Yes, Ajax is call of asynchronous javascript, but my only intention in calling it a framework is because the underlying technology was javascript and it was like working with a framework (logically of course). But now I guess I was technically wrong, as it does not meet the technical specification of a framework .

Thanks for correcting me.

[Rajdeep Biswas]

Hello all. I have a JSP page. I want to call and get value from a Java method from inside a Javascript function inside the jsp. I have browsed and found no easy to understand reply, and that I do not know AJAX, so I thought to post it here. Please help. Thanks.

Info: I am a demo web project in MyEclipse local PC, and its deployed in Tomcat.

[Bear Bibeault]

As already pointed out, you cannot call a Java method from JavaScript, even in a JSP. Please read this article to understand how JSP operates and why Java is not available in the JavaScript on a JSP page.

In order to have JavaScript obtain values from the server, you must use Ajax to create a request to the server that can invoke a servlet that will return the desired values as the response.

If you are working with web applications, you must learn Ajax. It's a required part of the technology set required to write modern web apps.

P.S. Using jQuery makes using Ajax much simpler.

[Rajdeep Biswas]

Alright. You mean through using XMLHTTPRequest...I am finding out.

[Rajdeep Biswas]

I am unable to find out. My little app is deployed in tomcat server, and I just want to get a value evaluated from a simple Java method (not Servlet) after calling it from a javascript function inside a JSP page.

[Bear Bibeault]

Rajdeep Biswas wrote:I just want to get a value evaluated from a simple Java method (not Servlet) after calling it from a javascript function inside a JSP page.

Well you can't. Period. End of story. And until you let go of the notion that you can, you will meet with failure.

You'll need to use Ajax to invoke a servlet that will call the method and serialize its value as the response.

[Rajdeep Biswas]

Alright! I got it. Thank you.