Running Javascript function automatically

I have found a javascript function that inverts colors on webpage:

String javascript = "javascript: (function (){var newSS, styles = '* { background-color: black ! important; color: green !important; }a:link, a:link * { color: green !important; text-style: underline; }a:visited, a:visited * { color: #7f0000 !important; }a:hover, a:hover * { color: red !important; }';var elemHead = document.getElementsByTagName(\"head\")[0];var elemCSS = document.getElementById(\"darkenCSS\");if (elemCSS){elemHead.removeChild(elemCSS);}else{newSS = document.createElement('link');newSS.rel = 'stylesheet';newSS.href = 'data:text/css,' + escape(styles);newSS.id = \"darkenCSS\";elemHead.appendChild(newSS);}})();";

Is it po开发者_如何学Pythonssible to run this automatically? By that I mean load www.google.co.uk and apply this javascript function.4

Hope that makes sense, I don't know much about javascript.

CLARIFICATION:

I want to know if this javascript function can be appended to a URL at all. Something like http://www.google.com/?Javascript_blah_blah_blah

FURTHER CLARIFICATION:

I am making a basic web browser in Android. I want to invert colours on the webpage. I have made a button, that executes this javascript on the page. This works. But needs the user to press the button each time.

I want to make a switch to make permanently inverted.

So I need to browse to the url input and have it invert the colours automatically.

Hope this helps

Yes, paste the string without quotes into the address bar. Be sure that the psuedo-protocol javascript: is at the beginning

addition by rlemon

You first need to modify your script to unescape the escaped quotes, then add a new bookmark to your addressbar. Edit the bookmark and change the location to

javascript:%20(function%20(){var%20newSS,%20styles%20=%20'*%20{%20background-color:%20black%20!%20important;%20color:%20green%20!important;%20}a:link,%20a:link%20*%20{%20color:%20green%20!important;%20text-style:%20underline;%20}a:visited,%20a:visited%20*%20{%20color:%20#7f0000%20!important;%20}a:hover,%20a:hover%20*%20{%20color:%20red%20!important;%20}';var%20elemHead%20=%20document.getElementsByTagName("head")[0];var%20elemCSS%20=%20document.getElementById("darkenCSS");if%20(elemCSS){elemHead.removeChild(elemCSS);}else{newSS%20=%20document.createElement('link');newSS.rel%20=%20'stylesheet';newSS.href%20=%20'data:text/css,'%20+%20escape(styles);newSS.id%20=%20"darkenCSS";elemHead.appendChild(newSS);}})();

There you have it!

No, you can't "just run" javascript appended to a URL. This is security breach (will be). But you can use

• bookmarklets ('URL' that begins with javascript:),
• browser plugins (Chrome/FF/Safari - all can do this) or
• you can look for plugin that can run userscripts. This is something like Greasemonkey.

Also you can try Fluid (Site Specific Browser, MacOS X only)... I think you get an idea.

BTW if you want/need to write bookmarlet you can run on specific site and want something to start - check this article: http://coding.smashingmagazine.com/2010/05/23/make-your-own-bookmarklets-with-jquery/

The easiest way if you are using Firefox (it is said the add-on works in Chrome and Opera, but I never tried it) is to install Greasemonkey and create a userscript for the domain(s)/URLs you want - www.google.co.uk/*, www.google.com/* etc.

However things like this are better done with Stylish extension, but you can use only CSS there, no JavaScript. But in what you presented, the following CSS fragment should work like a charm:

* { background-color: black ! important; color: green !important; }a:link, a:link * { color: green !important; text-style: underline; }a:visited, a:visited * { color: #7f0000 !important; }a:hover, a:hover * { color: red !important; }

There are lots of userscripts and userstyles available on the web.

You could use Chrome + http://defunkt.io/dotjs/ to achieve that. That's exactly the purpose of this extension: automatically run some JS scripts on specific websites.

It's OSX only for now but I guess there are some other extensions doing that as well.