Member Avatar for menukadevinda 
    <!DOCTYPE html >
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
    <title>AJAX with PHP: Quickstart</title>
    <script type="text/javascript" >

    var n = 1;
    function testNextPrime() {
        var isPrime = true;
        n = n + 1;
       // console.log('testing', n);
        for (var i = 2; i <= Math.sqrt(n); i += 1) {
            if (n % i == 0) isPrime = false;
        }

        if (isPrime) {
           document.getElementById("result").innerHTML='n';
          // document.getElementById("myDiv").innerHTML
        }

        // Schedule the next test (this gives browser a chance to update display and process any other events)
        setTimeout(testNextPrime, 200);
    }

    // Start testing for primes
    testNextPrime();

    </script>
    </head>
    <body>
        <p> I want to update prime number here</p>

    <div id="result" >

    </div>   
    </body>
    </html>



Hi I tried to update the div tag using above code. if I use document.write(n) instead of document.getElementById("result").innerHTML='n'; I can print the values. What is the wrong with above code?
Edited by menukadevinda
  • 3 Contributors
  • 2 Replies
  • 435 Views
  • 4 Hours Discussion Span
  • Latest Post Latest Post by JorgeM
Member Avatar for stbuchok

the div is not rendered on the page yet.

move line 26 to in between line 36 and 35

...
</div>
<script>
    testNextPrime();
</script>
</body>
</html>
Member Avatar for JorgeM

In addition to stbuchok's suggestion, on line 17, remove the single quotes around the n. n is a variable. The single quotes will treat it as a string.

Should be..

document.getElementById("result").innerHTML=n;

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.