Why Can\'t I Reliably Change Input Field Types with jQuery?

Changing Input Field Types with jQuery: An Issue Revisited

In an attempt to alter an input field's type from password to text and set a default value, the following jQuery snippet might fall short:

$(document).ready(function() {
    $('#password').attr('type', 'text');
    $('#password').val('Password');
});

Upon closer examination, the issue arises from browser security measures, which often forbid such actions.

To demonstrate this limitation, consider the following snippet, which creates a password input field and attempts to change its type to text:

var pass = document.createElement('input');
pass.type = 'password';
document.body.appendChild(pass);
pass.type = 'text';
pass.value = 'Password';

In this scenario, the operation succeeds without issue. However, upon inspecting the jQuery source code, we discover a specific case relating to Internet Explorer:

// We can't allow the type property to be changed (since it causes problems in IE)
if ( name == "type" && jQuery.nodeName( elem, "input" ) && elem.parentNode )
    throw "type property can't be changed";

This suggests that it may be a browser bug or a deliberate security feature in Internet Explorer. Therefore, changing the type of input fields via jQuery may not be a reliable solution in all cases.

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