Calling Servlet from JavaScript

debugcn Published at Dev

silver

I intend to call a function in JavaScript which then calls a Servlet after an <input type="image"> is clicked.

JSP:

<head>
    <script type="text/javascript">
        function callServlet() {
            document.location.href="test-servlet.jsp";
        }
    </script>
</head>

<body>
    <form action="https://www.sandbox.paypal.com/cgi-bin/webscr" method="post">
    ...
    <input type="image" name="submit"
        src="https://www.paypalobjects.com/webstatic/en_US/btn/btn_buynow_pp_142x27.png"
        onclick="callServlet()" alt="PayPal - The safer, easier way to pay online!">
    </form>
</body>

Servlet (test-servlet.jsp):

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    response.setContentType("text/html");

    PrintWriter out = response.getWriter();

    out.println("<h1>TestServlet called successfully!</h1>");
}

Context Root: http://localhost:8080/mysite/test-servlet.jsp

However, nothing happens when I click the image button. I am new to JavaScript.

Roman C

Try this code

<a href="#" onclick="callServlet()"><img
    src="https://www.paypalobjects.com/webstatic/en_US/btn/btn_buynow_pp_142x27.png"
    alt="PayPal - The safer, easier way to pay online!"></a>

EDIT:

Finally we discovered that a servlet should be mapped without extension and doGet method is used to get the request from javascript.

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