How to Change CSS Href="" Using JavaScript

How to change css href= using javascript?

Query for it like you would any other element using document.querySelector or document.querySelectorAll.

document.querySelector("link[href='u1.css']").href = "u2.css";

Alternatively, you could also access it via document.styleSheets as well.

As an example:

// Change [href] on first stylesheet to u2.css
document.styleSheets[0].href = "u2.css";

Replacing css file on the fly (and apply the new style to the page)

You can create a new link, and replace the old one with the new one. If you put it in a function, you can reuse it wherever it's needed.

The Javascript:

function changeCSS(cssFile, cssLinkIndex) {

    var oldlink = document.getElementsByTagName("link").item(cssLinkIndex);

    var newlink = document.createElement("link");
    newlink.setAttribute("rel", "stylesheet");
    newlink.setAttribute("type", "text/css");
    newlink.setAttribute("href", cssFile);

    document.getElementsByTagName("head").item(cssLinkIndex).replaceChild(newlink, oldlink);
}

The HTML:

<html>
    <head>
        <title>Changing CSS</title>
        <link rel="stylesheet" type="text/css" href="positive.css"/>
    </head>
    <body>
        <a href="#" onclick="changeCSS('positive.css', 0);">STYLE 1</a> 
        <a href="#" onclick="changeCSS('negative.css', 0);">STYLE 2</a>
    </body>
</html>

For simplicity, I used inline javascript. In production you would want to use unobtrusive event listeners.

How can you change the attached CSS file with Javascript?

Add an id to the link tag and use

<link id="myStyleSheet" href="stylesheet.css" rel="stylesheet" type="text/css" />

<script type="text/javascript">
    function styler(attr){
        var href;
        switch(attr){
            case'1':href = "stylesheet1.css";break;
            case'2':href = "stylesheet2.css";break;
            case'3':href = "stylesheet3.css";break;
            case'4':href = "stylesheet.css";break;
            default:;break;
        }
        document.getElementById('myStyleSheet').href = href;
    }
</script>

See this post

How to load up CSS files using Javascript?

Here's the "old school" way of doing it, which hopefully works across all browsers. In theory, you would use setAttribute unfortunately IE6 doesn't support it consistently.

var cssId = 'myCss';  // you could encode the css path itself to generate id..
if (!document.getElementById(cssId))
{
    var head  = document.getElementsByTagName('head')[0];
    var link  = document.createElement('link');
    link.id   = cssId;
    link.rel  = 'stylesheet';
    link.type = 'text/css';
    link.href = 'http://website.example/css/stylesheet.css';
    link.media = 'all';
    head.appendChild(link);
}

This example checks if the CSS was already added so it adds it only once.

Put that code into a JavaScript file, have the end-user simply include the JavaScript, and make sure the CSS path is absolute so it is loaded from your servers.

VanillaJS

Here is an example that uses plain JavaScript to inject a CSS link into the head element based on the filename portion of the URL:

<script type="text/javascript">
var file = location.pathname.split( "/" ).pop();

var link = document.createElement( "link" );
link.href = file.substr( 0, file.lastIndexOf( "." ) ) + ".css";
link.type = "text/css";
link.rel = "stylesheet";
link.media = "screen,print";

document.getElementsByTagName( "head" )[0].appendChild( link );
</script>

Insert the code just before the closing head tag and the CSS will be loaded before the page is rendered. Using an external JavaScript (.js) file will cause a Flash of unstyled content (FOUC) to appear.

Styling a div's links in Javascript

the :link :visited are not true CSS elements, but part of the CSS rule, this means you need to edit the rule, change the rule or apply another class...

var css='#element a:link { color: #ff0000 }';
style=document.createElement('style');
if (style.styleSheet)
    style.styleSheet.cssText=css;
else 
    style.appendChild(document.createTextNode(css));
document.getElementsByTagName('head')[0].appendChild(style);

Change link color of the current page with CSS

a:active : when you click on the link and hold it (active!).

a:visited : when the link has already been visited.

If you want the link corresponding to the current page to be highlighted, you can define some specific style to the link -

.currentLink {
   color: #640200;
   background-color: #000000;
}

Add this new class only to the corresponding li (link), either on server-side or on client-side (using JavaScript).

How to Change CSS Href="" Using JavaScript