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Editorial Team
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Asked: 2026-06-09T07:26:44+00:00

I am experimenting with JavaScript again, and wanted to make a clock in an

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I am experimenting with JavaScript again, and wanted to make a clock in an alert box (bookmarklet).

The following code:

javascript:alert(new%20Date().toLocaleString())

will show the time in the format Wednesday, August 08, 2012 12:40:54 AM. However, the time for the clock is not updated because the bookmarklet is just fetching the time. So, are alert boxes able to be updated (like this:)

javascript:alert(setInterval("new%20Date().toLocaleString()",1000))

or is an alert box not able to be updated (it fetches something and then stops executing script)?

EDIT* I have tried the second code line already and know it doesn’t work, I only mean for it to be an example of finding a method that allows the time to be updated.

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1 Answer

  1. Editorial Team

    No – alert boxes print a string and their content cannot be changed whilst they are showing.

    Use a DHTML dialog simulation instead, such as Facebook’s. Since these are just HTML doing the job of native modal functions (e.g. alert()) they are much more flexible.

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