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scorks
post Jan 29 2015, 11:04 PM
Post #1





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Hi there, I'm very new to forms, and am looking to make a counter that when the "increase" button is pressed, the counter is increased by 1 and displayed. If the decrease button is pressed, the counter is decreased by one and displayed. Also, there is a text box where the user can enter a new counter number. I need to figure out a way to save my counter variable so that when the button is pressed, it remembers what the previous number stored was. So far I have:

CODE

import static spark.Spark.get;
import static spark.Spark.post;
import static spark.Spark.port;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

public class exer7 {

    private static int counter = 0;
    
    private static String FORM_PAGE =
        "<html>\n" +
        "<body>\n" +
        "<form action='/counter' method='POST'>\n" +
        "<label><input type='text' name='countNum'></label>\n" +
        "<input type='submit' name='count' value='Increase'>\n" +
        "<input type='submit' name='count' value='Decrease'>\n" +
        "The current count is: " +
        counter +
        
        "</body>\n";

        public static void main(String[] args) {
    
        get("/counter", (request, response) -> FORM_PAGE );

        post("/counter", (request, response) -> {
            String c = request.queryParams("count");
            
           int amt = Integer.parseInt(request.queryParams("countNum"));
           if (c.equals("Increase")) {
               counter = amt+1;
           }
           else if (c.equals("Decrease")) {
              counter = amt-1;
          }
          else {
              // return an error page
          }    

    return Integer.toString(counter);    

        });
    
    }
}



It's not 100% complete or correct yet, but could anyone help out with the problem at hand? I'd really appreciate it! Thanks!
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scorks
post Jan 29 2015, 11:05 PM
Post #2





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Also, please ignore my random imports. They're from my previous question.
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CharlesEF
post Jan 29 2015, 11:40 PM
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Are you trying to do this with server or client side code? Or are you trying to use Java? (I don't do Java) A javascript counter (client side) would only work if the user has not disabled javascript. Server side code would need to use AJAX and you would need a place to store the counter value.
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CharlesEF
post Jan 29 2015, 11:45 PM
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Oh, I think HTML5 provides a counter. See this link .
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pandy
post Jan 30 2015, 09:05 AM
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Doesn't look well supported though. Yeah, what language are you using?
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