Remove/change Internal styles sheet styles with JavaScript/jQuery
I want to be able to remove/change the internal style sheets values through JavasScript. It has to be through JS because I cannot edit the html since I am using an application that does not allow me to, but I can use JS. How can I change the value for the background or remove it completely? Or is there a开发者_C百科nother way to accomplish this?
<body>
<head>
<style type="text/css">
#company-header{background:#000 !important;}
</style>
</head>
<div id="company-header"></div>
</body>
If your just going to change small bits of css, using jQuery's css() is your best option, but it does not always recognize !important, for that you would probably need cssText, like this:
$('#id').css('cssText', 'height: 200px !important');
This replaces all the css, so everything needs to be defined in the new css rules that are added.
If you are changing a lot of css, or just want to make it easier for the next time, you could remove all inline css and add an external stylesheet instead.
To remove all inline styles you would do something like this:
$(document).removeAttr('style');
or for div's only
$('div').removeAttr('style');
Depending on how many styles there are, this could take som time to process.
Then to add a new stylesheet do:
(function() {
var myCSS = document.createElement('link');
myCSS.rel = 'stylesheet';
myCSS.type = 'text/css';
myCSS.src = '/styles/mystylesheet.css';
var place = document.getElementsByTagName('script')[0];
place.parentNode.insertBefore(myCSS, place);
})();
Edit:
function removeCSS() {
var badCSS = document.getElementsByTagName('style')[0];
$(badCSS).remove();
});
This will remove all the markup in the internal stylesheet, but since the styles are already loaded it will make absolutely no difference.
Internal styles will always override external styles, but for one exeption, if the external style is !important. If both the external and internal styles are !important, the internal style will be used.
Loading an external stylesheet dynamicly with javascript will only work if everything you are trying to override is set to !important in the external stylesheet, and not set to !important in the internal stylesheet.
Changing the styles directly in the DOM with jQuery's css() and using the cssText option to override the !important set in the internal stylesheet may be your only viable option if there is absolutely no way to alter the html file and remove the internal stylesheet.
EDIT: OK, now that we understand that this question is really just about how to override the !important style declaration when setting styles via javascript, this is a duplicate of this posting: Overriding !important style.
The two possible answers there are to set a whole style string on the object or to create a new stylesheet that refers to this object.
Previous answer before question was edited:
You can just set some style directly on the object if you want like this. This will override anything that comes from a style sheet so you don't have to mess with the style sheet.
$("#company-header").css("background-color", "#FFFFFF");
or
$("#company-header").css("background", "none");
A more extensible way of modifying the look of an object or groups of objects is to based the style settings on class names and then add/remove class names using jQuery. This has the effect of switching which style sheet rules apply to a given object without having to directly manipulate the style sheets themselves:
$("#company-header").removeClass("oldClass").addClass("newClass");
$(document).ready(function(){
$('style').remove();
});
This code will remove the all internal css from the site. I used this but style tag will be visible in the page source.
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