Do you have to change the style of each individual element using JavaScript, or is there another method to accomplish this?

Recently, I've been exploring different ways to use JavaScript to globally adjust styles. My goal is to modify the CSS rule that controls the element's style, similar to how you can do it using the Inspector in Webkit. However, after visiting https://developer.mozilla.org/en/DOM/CSSStyleRule, I am now unsure if this approach is even feasible:

style

Returns the CSSStyleDeclaration object for the rule. Read only.

So, does this mean that it's impossible to modify higher-level styles using JavaScript?

javascripthtmlcss

Answer №1

To make changes to your existing styles, you can locate the stylesheet in document.styleSheets or access it from the .sheet property of the <style> or <link> element that you want to modify. Once you have the stylesheet, you can modify the properties within the specific rule where they are located (refer to https://developer.mozilla.org/en/DOM/CSSRuleList). I recommend avoiding the use of CSSOM to modify properties, as browser support for this feature is lacking (currently, no browsers support it). It is better to set the properties as a string value instead.

If your goal is to add a new rule, you can either obtain a stylesheet using the method mentioned above, or create a new stylesheet using 

document.documentElement.appendChild(document.createElementNS("http://www.w3.org/1999/xhtml","style")).sheet
. Then, you can use insertRule to add your new rule.

Answer №2

Changing CSS styles programmatically through JavaScript can be a bit tricky, especially when considering cross-browser compatibility. It's usually best to define different styles in a stylesheet and switch between them using class designations. If you only need to affect a few objects, you can easily add or remove class names using JavaScript. For a larger number of objects, you can add a class name to a common parent element to apply a different style to all affected objects.

By creating pre-defined CSS rules and toggling a class with JavaScript, you can easily switch between different styles without having to dynamically create style rules. This approach keeps the style information separate from the code, making it more accessible to designers who may not be familiar with programming.

You can view a demonstration of this technique here: http://jsfiddle.net/jfriend00/UXKvg/

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