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Editorial Team
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Asked: 2026-05-27T07:15:37+00:00

Is it okay to call prompt this way: prompt(‘Enter your text here’); instead of:

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Is it okay to call prompt this way:

  prompt('Enter your text here');

instead of:

  prompt('Enter your text here', '');

I.e. without passing a suggested input to it?

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1 Answer

  1. Editorial Team

    Yes, it is OK.

    The second parameter to prompt method is optional (see “window.prompt on MDN”).
    As according to ECMAScript specification (ECMA-262, section 4.3.9), a value of undefined is given to a variable which has no assigned value. In the prompt method, it doesn’t matter whether you leave the second parameter as undefined or pass an empty string to it: both result in empty string as default value in the prompt.

    In case you are wondering why this information is not available on DOM standards such as W3C DOM the answer is that it is a non-standard method that is “just” commonly supported by browsers (part of so called “DOM Level 0” spec). However, the upcoming HTML 5 is likely to define prompt (window.prompt) as a standard method (see “6.4 User prompts”).

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