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Editorial Team
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Asked: 2026-05-16T23:07:41+00:00

I realize this isn’t terrific from a security perspective but humor me. Is there

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I realize this isn’t terrific from a security perspective but humor me.

Is there a way to create a bookmarklet that submits a form, such as a login form. For example, this works, but only if there is a page loaded in the current browser window:

javascript:(function(){document.body.innerHTML += '<form id=f action=https://www.mysite.com/login method=post><input type=hidden name=un value=uname><input type=hidden name=pw value=pword>';document.getElementById("f").submit();})();

Is there some way to construct the form right in the JavaScript and submit that?

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1 Answer

  1. Editorial Team

    If you don’t need the current page at all, you can completely replace it by having the bookmarklet expression return a string containing the complete new page:

    javascript:'<body onload="document.forms[0].submit()"><form method="post" action="https://www.mysite.com/login"><input type="hidden" name="un" value="uname"><input type="hidden" name="pw" value="pword"></form>'

    then you don’t have to worry about whether the previous page had a <body> or another element with id="f".

    (And +1 Matti: innerHTML+= is always a mistake.)

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