how to pass a javascript variable to a java servlet?

Question

I want to pass a javascript variable to a java servlet. I am developing a web application. This is my html code:

<p id="test">Some text</p>

And this is what i write in the javascript file:

var myVar = document.getElementById('test').innerText;

$.ajax({
    url: 'Test',
    data: {
        myPostVar: myVar
    },
    type: 'POST'
});

And then this in the servlet (in the doGet):

String result = request.getParameter("myPostVar");
System.out.print(result);

And if i run the Test.java to test, it gives me "null". I googled too much but could not find any solution.

What do you mean "if I run the Test.java to test"? How do you run it? — nnnnnn, Jan 22 '15 at 23:20
You example should work if you pass JavaScript variable to the SERVER. — MaxZoom, Jan 22 '15 at 23:56
Helpful hint, I recommend using ``textContent`` instead of ``innerText`` because the former is W3C compliant and is more universally supported. — Patrick Roberts, Jan 23 '15 at 07:15

score 2 · Answer 1 · answered Jan 23 '15 at 07:11

2

The problem is you have the post method in your ajax and you are trying to get it in the doGet() of your servlet.

Use doPost or change the method to Get in your ajax.

answered Jan 23 '15 at 07:11

Santhosh

8,181
4
29
56

score 0 · Answer 2 · answered Jan 23 '15 at 08:58

0

Try this:

public void doPost(HttpServletRequest request, HttpServletResponse response) 
   throws ServletException, IOException
{
    String myPostVar = request.getParameter("myPostVar");
    // ...
}

answered Jan 23 '15 at 08:58

Stephan

41,764
65
238
329

how to pass a javascript variable to a java servlet?

2 Answers2

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