html retern null count-up time

I am trying to create a timer upstart from a specific value

JS code

            <script type="text/javascript"> 
            var minutesLabel = document.getElementById("minutes");
            var secondsLabel = document.getElementById("seconds");
            var totalSeconds = 0;
            setInterval(setTime, 1000);
            function setTime() {
                ++totalSeconds;
                secondsLabel.innerHTML = pad(totalSeconds % 60);
                minutesLabel.innerHTML = pad(parseInt(totalSeconds / 60));
            }

            function pad(val) {
                var valString = val + "";
                if (valString.length < 2) {
                    return "0" + valString;
                }
                else {
                    return valString;
                }
            }
        </script>

HTML Code

<asp:Label ID="minutes" runat="server" Text="00"></asp:Label>:<asp:Label ID="seconds" runat="server" Text="00"></asp:Label>

Error Console and keep printing every 1 sec

Uncaught TypeError: secondsLabel is null
setTime https://localhost:44340/attendance:30

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Answers:

Method 1

Answers:

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Method 1

There is nothing wrong with the script, looks like it does not find your html elements for some reason. There must be something else going on, because following script runs perfectly in my browser as plain html file:

<body>
<asp:Label ID="minutes" runat="server" Text="00"></asp:Label>:<asp:Label ID="seconds" runat="server" Text="00"></asp:Label>
    
    <script type="text/javascript"> 

            var minutesLabel = document.getElementById("minutes");
            var secondsLabel = document.getElementById("seconds");
            var totalSeconds = 0;

            setInterval(setTime, 1000);
            function setTime() {
        
                ++totalSeconds;
                secondsLabel.innerHTML = pad(totalSeconds % 60);
                minutesLabel.innerHTML = pad(parseInt(totalSeconds / 60));
            }

            function pad(val) {
                var valString = val + "";
                if (valString.length < 2) {
                    return "0" + valString;
                }
                else {
                    return valString;
                }
            }
    </script>
</body>

Maybe you could try swapping tags with plain and see if problem goes away (sorry, i don’t know ASP and if it affects in your example).

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