Alter the Cascading Style Sheets (CSS) value by accessing a

I have two files, keyboard.css and keyboard.js. My objective is to modify a CSS rule:

.ui-keyboard div { font-size: 1.1em; }

Is there an alternative method to change the font size without utilizing
$(".ui-keyboard div").css()?

I want the modification to occur before the element is rendered. In other words, I want to pass the value when constructing the element.

$('.onScreenKeyboard').keyboard({
    zoomLevel: 2
});

Edit: To clarify further, my aim is to provide an option in the library that allows for the modification of font size. Instead of directly editing the CSS values, I want to create an option within the constructor:

Inside the constructor, I can check for available options and make changes to the element accordingly.

// Set Zoom Level
if(o.zoomLevel){
    // Make CSS changes here.
}
javascriptjquery

Answer №1

If you're searching for similar functionality, consider exploring the concepts behind CSSStyleSheet's insertRule and deleteRule.

A while ago, I developed a piece of code that enables CSS rule modification:

function CustomCSS(sheet) {
    if (sheet.constructor.name === 'CSSStyleSheet') this.sheet = sheet;
    else if (sheet.constructor.name === 'HTMLStyleElement') this.sheet = sheet.sheet;
    else throw new TypeError(sheet + ' is not a StyleSheet');
}
CustomCSS.prototype = {
    constructor: CustomCSS,
    add: function(cssText) {
        return this.sheet.insertRule(cssText, this.sheet.cssRules.length);
    },
    del: function(index) {
        return this.sheet.deleteRule(index);
    },
    edit: function(index, cssText) {
        var i;
        if (index < 0) index = 0;
        if (index >= this.sheet.cssRules.length) return this.add(cssText);
        i = this.sheet.insertRule(cssText, index);
        if (i === index) this.sheet.deleteRule(i + 1);
        return i;
    }
};

To utilize it, instantiate the CustomCSS constructor with your <style> node or the associated StyleSheet. Then, utilize the .edit method by providing the desired rule index and the new rule you wish to apply. For example:

// Access the StyleSheet
var myCustomCSS = new CustomCSS(document.querySelector('style[src="keyboard.css"]'));
// Edit the first rule
myCustomCSS.edit(0, '.ui-keyboard div { font-size: 5em; }');

Answer №2

When working with your library, make sure to apply the following CSS to your element first. Initially, hide it and only display it once you have modified the style properties accordingly.

.custom-library-container div {
     font-size: 1.2em;
     display: none;
}

If you prefer not to use jQuery, you can still adjust the font size using pure JavaScript, like this:

[element].style.fontSize = "30px";

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