JSP通过href调用javascript函数

Question

The following code in JSP:

while(rs2.next()) 
    { 
        out.println(rs2.getString(1));
        %>
            <a href="javascript:displayData(<%=rs2.getString(1)%>)">Run The App</a>
        <%
        out.println("<br>");
    }

I want for each element to print its name and a link to JavaScript function that takes the name as a parameter.

The JavaScript that I have is:

<script type="text/javascript">
    function displayData(ctr) {
        alert(ctr);
        <%
            Process p = null;
            Runtime r = Runtime.getRuntime(); 
            String command; 
            File dir = new File("C:/app/webapps/data"); 
            command="javaw -jar "+ctr;
            try 
            { 
                p = r.exec(command,null,dir);
            }
            catch(Exception e) 
            { } 
        %>
    }
</script>

What the function does is to execute a jar file (the jar file is executed by calling its name which in this case the parameter that I pass ctr ). The error that I got is:

ctr cannot be resolved to a varialbe

Can someone help me in this problem?

Answer 1

The only way to call Jsp from client is to call an url. If you want to do this asynchronously (without refreshing) you should use Ajax. I think you are looking for something like this https://blog.udemy.com/jsp-ajax/ .