how to pass a javascript variable to a java servlet? [duplicate]

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
– nnnnnn, Commented Jan 22, 2015 at 23:20
You example should work if you pass JavaScript variable to the SERVER. — MaxZoom
– MaxZoom, Commented Jan 22, 2015 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
– Patrick Roberts, Commented Jan 23, 2015 at 7:15

Santhosh · Accepted Answer · 2015-01-23 07:11:51Z

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, 2015 at 7:11

Santhosh

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Stephan · Accepted Answer · 2015-01-23 08:58:08Z

0

Try this:

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

answered Jan 23, 2015 at 8:58

Stephan

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