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Editorial Team
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Asked: 2026-06-08T05:52:10+00:00

I want to do a simple thing. I have a servlet. Inside the DoPost()

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I want to do a simple thing.

I have a servlet. Inside the DoPost() function I’m writing HTML output to be shown in the browser. This HTML includes a single image. When clicking this image I want to alert its element id.

servlet:

public void printSinglePlayerBoard(int i_PlayerNumber, HttpServletResponse respose)
throws IOException
{
    response.setContentType("text/html");
    PrintWriter out = response.getWriter();
    out.println("<html>\n");
    out.println("<script language='javascript' type='text/javascript'
    src='functions.js'></script>\n");
    out.println("<body>\n");
    out.print("<img id='someID' src='somePath' onclick='func(someID)'/>");
    out.print("</form>\n</body>\n</html>\n");
}

functions.js:

function func(someID)
{
    alert(someID);
    var x = document.getElementById(someID);
    alert(x);
}

My problem is that I would like to get the someID String but neither alert(someID) or alert(x) returns my result. What seems to be the problem?

alert(someID) –> returns [Object HTMLImageElement]

alert(x) –> returns null

Does functions.js even recognize the HTML elements created in the servlet?

Thank you!

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1 Answer

  1. Editorial Team

    Change this line

    out.print("<img id='someID' src='somePath' onclick='func(someID)'/>");

    to

    out.print("<img id='someID' src='somePath' onclick='func(\"someID\")'/>");
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