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Asked: 2026-06-06T20:10:19+00:00

i cant use setInterval mehod, i don’t know why. what’s wrong with this script,

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i cant use setInterval mehod, i don’t know why.
what’s wrong with this script, after clicking on stop it doesn’t show the result of counter i in the text field.

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <title>test_setInterval</title>

        <script type="text/javascript">
            var i = 0;
            var interval;

            function start ()
            {
                interval = document.setInterval("i++", 1000);
            }

            function stop ()
            {
                document.clearInterval(interval);
                output.value = i;
            }
        </script>

    </head>

    <body>
        <input id="output" type="text" />
        <input id="start" type="button" value="start" onclick="start()" />
        <input id="stop" type="button" value="stop" onclick="stop()" />
    </body>
</html>
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1 Answer

  1. Editorial Team
    1. clearInterval and setInterval are methods of window, not document. You can call them as window.clearInterval or just clearInterval.
    2. It’s better to use function as the first argument for setInterval, not a string with the code, because eval is evil.

    Here is a working demo http://jsfiddle.net/9cveg/

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