Why does setting autocomplete="on" via a user script still not allow storing of passwords in Chrome? [closed]_问答_开发者

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My goal is to use a Greasemonkey-style user script in Google Chrome to enable remembering of passwords on a specific form that has the autocomplete="off" attribute set.

Chrome's developer tools indicate that autocomplete="on" is being successfully set by the script, but this does not have the expected effect of allowing the storage of passwords on the form.

Why doesn't thi开发者_开发问答s work?

Example

Chrome offers to remember passwords entered on this test page (Expected):

<html><body><form action="">
    <input type="text" name="username" />
    <input type="password" name="password" />
    <input type="submit" name="submit" value="Log In" />
</form></body></html>

Chrome does not offer to remember passwords entered on this test page (Expected):

<html><body><form action="">
    <input type="text" name="username" />
    <input type="password" name="password" autocomplete="off" />
    <input type="submit" name="submit" value="Log In" />
</form></body></html>

Chrome's Inspect Element tool reveals a successful modification of the above test page by the user script (Expected):

<html><head></head><body><form action="" autocomplete="on">
    <input type="text" name="username" autocomplete="on">
    <input type="password" name="password" autocomplete="on">
    <input type="submit" name="submit" value="Log In">
</form></body></html>

Chrome still does not offer to remember passwords after this modification (Unexpected).

As an experiment, try this bookmarklet, it clears autocompletes and pops up this dialog (typical):

Why does setting autocomplete="on" via a user script still not allow storing of passwords in Chrome? [closed]

javascript:(function%20(){var%20zCurrentElement=document.activeElement;var%20cfa,cea,cs,df,fe,i,j,sf,se;cfa=cea=cs=0;df=document.forms;for(i=0;i<df.length;i++){sf=df[i];fe=sf.elements;if(sf.onsubmit){sf.onsubmit='';cs++;}if(sf.attributes.autocomplete){sf.attributes.autocomplete.value='on';++cfa;}for(j=0;j<fe.length;j++){se=fe[j];if(se.attributes.autocomplete){se.attributes.autocomplete.value='on';cea++;}}}var%20zNode=document.createElement('div');zNode.setAttribute('id','idAPW_NotifWindow');zNode.innerHTML='<p>Removed:</p>'+'<ul>'+'<li>"autocomplete=off"%20from%20'+cfa+'%20form(s)<br>'+'%20and%20from%20'+cea+'%20form%20element(s).'+'<li>onsubmit%20from%20'+cs+'%20form(s).'+'</ul>'+'<p>After%20you%20type%20your%20password%20and%20submit%20the%20form,%20the%20browser%20will%20offer%20to%20remember%20your%20password.</p>'+'<style%20type="text/css">'+'#idAPW_NotifWindow'+'{'+'position:%20%20%20absolute;'+'visibility:%20visible;'+'margin:%205px;'+'padding:0em%202em%202em%202em;'+'max-width:%20%20400px;'+'background-color:%20%20%20orange;'+'border:%203px%20double;'+'font-size:%20%2014px;'+'text-align:%20left;'+'opacity:0.97;'+'z-index:1000;'+'cursor:%20pointer;'+'}'+''+'#idAPW_NotifWindow%20p,%20#idAPW_NotifWindow%20ul,%20#idAPW_NotifWindow%20li'+'{'+'margin:%200;'+'padding:%200;'+'line-height:130%;'+'}'+'#idAPW_NotifWindow%20p'+'{'+'padding:1em%200%200%200'+'}'+'#idAPW_NotifWindow%20ul'+'{'+'padding:0%200%200%202em;'+'}'+'#idAPW_NotifWindow%20li'+'{'+'margin:%200%200%200.5em%200;'+'}'+'</style>';zNode.style.top=window.scrollY+'px';zNode.style.left=window.scrollX+'px';document.body.appendChild(zNode);zNode.addEventListener("click",function(){var%20zNode=document.getElementById('idAPW_NotifWindow');if(zNode)zNode.style.visibility='hidden';},false);if(zCurrentElement){if(/input/i.test(zCurrentElement.tagName)){zCurrentElement.blur();zCurrentElement.focus();}}})();

If that works, then the GM script may be missing a form-level autocomplete="off" or there may be an onsubmit handler somewhere in the page.

If it doesn't work, then this task is may not be possible in Chrome. (Note similar GM and the bookmarklet both work fine in Firefox. :) )

Autocomplete=on is one of the first extensions I installed. I recommend that you read the source for it, as it includes some comments from a Chromium insider. The problem is that Chrome checks all the autocomplete attributes once at a specific time, so the script runs just when the DOM is loaded but before Chrome checks for autocomplete.

There are some new comments there though that indicate that the extension doesn't work in Chrome 9. Perhaps this merits further investigation.