How can I dynamically change CSS class rules in real time with jQuery?

Change CSS Class Rules Dynamically with jQuery

Your query involves two aspects:

1. Modifying Class Rules in Real Time

jQuery alone cannot alter CSS class rules dynamically. However, you can utilize the styleSheets property of the document object to access CSS rules directly.

Code:

<code class="javascript">document.getElementById("button").onclick = function() {
    var ss = document.styleSheets;

    for (var i = 0; i < ss.length; i++) {
        var rules = ss[i].cssRules;
        for (var j = 0; j < rules.length; j++) {
            if (rules[j].selectorText === ".classname") {
                rules[j].style.fontSize = "20px";
            }
        }
    }
};</code>

2. Saving Class Changes to File

To save class changes to a file, you need to extract the CSS rules and send them to the server via an Ajax request. The server-side implementation involves creating or updating a file with the modified rules.

Additional Notes:

• For IE6 compatibility, use document.styleSheets instead of document.styleSheets.
• To get the CSS rules, access the rules property of the stylesheet object.
• Use the cssText property to set or modify CSS rules.

References:

• document.styleSheets (Mozilla): https://developer.mozilla.org/en-US/docs/Web/API/Document/styleSheets
• styleSheet Object (Mozilla): https://developer.mozilla.org/en-US/docs/Web/API/StyleSheet
• CssRule Object (Mozilla): https://developer.mozilla.org/en-US/docs/Web/API/CSSRule
• document.styleSheets (MSDN): https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/dom/document.stylesheets
• CssRule Object (MSDN): https://docs.microsoft.com/en-us/previous-versions/windows/internet-explorer/ie-developer/dom/cssrule

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