Load images in advance for hover effects on active selectors within the specified CSS file paths

Question

Load images in advance for hover effects on active selectors within the specified CSS file paths

Currently, I have opted not to utilize css sprites.

While I acknowledge that it is the most efficient solution, time constraints prevent me from implementing it at this moment.

I am seeking a method to preload all images for hover and active selectors.

I came across a jQuery solution here

However, I am curious if there is a way for jQuery to dynamically read all active and hover selectors in my CSS files?

The filepath to my CSS file is /theme/V1/css/content.css

An example of the CSS file content is as follows:

.button_48x49_img {
    width: 48px;
    height: 49px;
}

.button_join_login_48x49_img {
    background-image: url('a.png');
}

.button_join_login_48x49_img:hover {
    background-image: url('b.png');
}

.button_join_login_48x49_img:active {
    background-image: url('c.png');
}

Is there a way to preload only b.png and c.png without explicitly specifying this in the JavaScript preload code?

javascript jquery html css

Answer 1

Answer №1

It might pose a challenge, as you will need to focus on the hover and active selectors - this goes beyond my capabilities...

HOWEVER - If you're seeking a simple fix, you can preload the images by referencing the images you wish to load in a concealed div:

    <div class="preload-images">
        <img src="x.png" />
        <img src="y.png" />
    </div>

And the css:

    .preload-images{display:none;}

Piece of cake.

Answer 2

It might pose a challenge, as you will need to focus on the hover and active selectors - this goes beyond my capabilities...

HOWEVER - If you're seeking a simple fix, you can preload the images by referencing the images you wish to load in a concealed div:

    <div class="preload-images">
        <img src="x.png" />
        <img src="y.png" />
    </div>

And the css:

    .preload-images{display:none;}

Piece of cake.

Answer 3

Answer №2

If you're looking to dynamically retrieve the :hover and :active class properties, here is a snippet of code that can help you achieve that. With this approach, you'll be able to access both the paths for b.png and c.png, which could be useful for preloading purposes.

Check out the demo on Fiddle: http://jsfiddle.net/FjTn5/

HTML

<div class="button_48x49_img button_join_login_48x49_img"></div>

Javascript

function getCssProperty(rule, prop) {
    var sheets = document.styleSheets;
    var slen = sheets.length;
    for(var i=0; i<slen; i++) {
        var rules = document.styleSheets[i].cssRules;
        var rlen = rules.length;
        for(var j=0; j<rlen; j++) {
            if(rules[j].selectorText == rule) {
                return rules[j].style[prop];
            }
        }
    }
}


console.log(getCssProperty('.button_join_login_48x49_img:hover', 'background-image'));
console.log(getCssProperty('.button_join_login_48x49_img:active', 'background-image'));

CSS

.button_48x49_img {
    width: 48px;
    height: 49px;
}

.button_join_login_48x49_img {
    background-image: url('a.png');
}

.button_join_login_48x49_img:hover {
    background-image: url('b.png');
}

.button_join_login_48x49_img:active {
    background-image: url('c.png');
}

Answer 4

If you're looking to dynamically retrieve the :hover and :active class properties, here is a snippet of code that can help you achieve that. With this approach, you'll be able to access both the paths for b.png and c.png, which could be useful for preloading purposes.

Check out the demo on Fiddle: http://jsfiddle.net/FjTn5/

HTML

<div class="button_48x49_img button_join_login_48x49_img"></div>

Javascript

function getCssProperty(rule, prop) {
    var sheets = document.styleSheets;
    var slen = sheets.length;
    for(var i=0; i<slen; i++) {
        var rules = document.styleSheets[i].cssRules;
        var rlen = rules.length;
        for(var j=0; j<rlen; j++) {
            if(rules[j].selectorText == rule) {
                return rules[j].style[prop];
            }
        }
    }
}


console.log(getCssProperty('.button_join_login_48x49_img:hover', 'background-image'));
console.log(getCssProperty('.button_join_login_48x49_img:active', 'background-image'));

CSS

.button_48x49_img {
    width: 48px;
    height: 49px;
}

.button_join_login_48x49_img {
    background-image: url('a.png');
}

.button_join_login_48x49_img:hover {
    background-image: url('b.png');
}

.button_join_login_48x49_img:active {
    background-image: url('c.png');
}

Answer 5

Answer №3

Click here to learn about automatically preloading images from CSS using jQuery

This tutorial demonstrates a technique for jquery to preload images specified in the css files.

However, keep in mind that this method does not differentiate between hover selectors and active selectors.

After implementing this solution on my own webapp, I observed a significant increase in loading time for the images.

While technically correct, utilizing this approach may not be ideal when aiming to create an efficient web application.

Answer 6

Click here to learn about automatically preloading images from CSS using jQuery

This tutorial demonstrates a technique for jquery to preload images specified in the css files.

However, keep in mind that this method does not differentiate between hover selectors and active selectors.

After implementing this solution on my own webapp, I observed a significant increase in loading time for the images.

While technically correct, utilizing this approach may not be ideal when aiming to create an efficient web application.

Load images in advance for hover effects on active selectors within the specified CSS file paths

Answer №1

Answer №2

Answer №3

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