The program performs flawlessly on two occasions, but then it starts to malfunction

Even after inputting the correct answer multiple times, the output still displays "try again." What could be causing this unusual behavior?

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
        <title>Untitled Document</title>
        <script type="text/javascript">
            var answer;
            var firstNum;
            var secondNum;
            var check = true;
            question();

            function question() {
                firstNum = Math.floor(Math.random() * 101);
                secondNum = Math.floor(Math.random() * 101);
                answer = firstNum * secondNum;
                document.writeln("<h1>What is the result of " + firstNum + " multiplied by " + secondNum + "</h1>");
                document.writeln(answer);
                document.write('<input name="inputAnswer" type="text" id="inputAns"/>');
                document.write('<input name="submitBtn" type="submit" value="Submit Answer" onclick="validate()"/>');
            }

            function validate() {
                if (document.getElementById("inputAns").value == answer) {
                    document.write("Correct");
                    check = true;
                    result();
                } else {
                    check = false;
                    document.write("Try again");
                    result();
                }
            }

            function result() {
                if (check == true)
                    question();
                else {
                    document.writeln("<h1>What is the result of " + firstNum + " multiplied by " + secondNum + "</h1>");
                    document.writeln(answer);
                    document.write('<input name="inputAnswer" type="text" id="inputAns"/>');
                    document.write('<input name="submitBtn" type="submit" value="Submit Answer" onclick="validate()"/>');
                }
            }
        </script>
    </head>

    <body></body>

</html>

Answer №1

The reason behind this issue is that you are consistently generating elements with the id="inputAns". It's important to remember that two elements cannot share the same id.

Another key point to consider is:

  • If the number is entered in the FIRST input box, the output (good / try again) will display correctly. This behavior is a result of how document.getElementByID functions.
  • Regardless of which "Submit answer" button you click on, they all perform the same action (validate()).

Answer №2

My approach to this problem is slightly different. Feel free to give it a try.

    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"                                          "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
 <h1>Calculate <span id="firstnumber"></span>  multiplied by <span id="secondnumber"></span></h1>
              answer
                <input name="inputAnswer" type="text" id="inputAns"/>
                <input name="submitBtn" type="submit" value="Submit Answer" onclick="validate()"/>
                <span id="answer"></span>
<script type = "text/javascript">
    var answer;
    var firstNum;
    var secondNum;
    var check= true;
   var count=0;
question();


    function question()
    {   

            firstNum= Math.floor(Math.random()*101);
            secondNum= Math.floor(Math.random()*101);

            answer = firstNum * secondNum;



              document.getElementById("firstnumber").innerHTML=firstNum;
               document.getElementById("secondnumber").innerHTML=secondNum;

    }



    function validate()
    {
        if(document.getElementById("inputAns").value == answer)
        {


            check= true;


        }
        else
        {
            check= false;


        }
        result();


    }

    function result()
    {
        if(check== true)
        {
            document.getElementById("answer").innerHTML="Correct answer"
            count=count+1;


        }
        else
        {
            document.getElementById("answer").innerHTML="Incorrect answer.<br>You've answered "+count+" questions correctly.";
        }
        document.getElementById("inputAns").value="";
         question();


    }

    </script>

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