Is there a method to retrieve all the CSS styles specified for a specific DOM element? Do I need to iterate through all the CSS style names?
Could there be a more sophisticated approach? How exactly does Firebug achieve this task?
Appreciate any insights!
To retrieve the computed style of an element, you can utilize the getComputedStyle function:
var styles = window.getComputedStyle(elem);
for (var j=0; j<styles.length; j++) {
console.log(styles[j] +'='+styles.getPropertyValue(""+styles[j]))
}
Keep in mind that this method will return values in pixels even if they were initially specified as plain numbers. For instance, a line-height set to 1.2 will be shown as 57.6px in the output.
Prior methods tend to mess up the styles when they are altered before being expanded. This often results in a plethora of default styles being applied.
On the other hand, my approach focuses on stripping away the default styles while preserving the cascading styles across various elements.
To utilize this solution, simply execute the script in the console and copy the desired element from the Elements view (verified on Chrome).
function updateStyle(element) {
var children = element.children;
for(var i = 0; i < children.length; i++) {
updateStyle(children[i]);
var defaultElement = document.createElement(children[i].nodeName);
var child = document.body.appendChild(defaultElement);
var defaultStyles = window.getComputedStyle(defaultElement, null);
var computedStyles = window.getComputedStyle(children[i], null).cssText;
for(var j = 0; j < defaultStyles.length; j++) {
var defaultProperty = defaultStyles[j] + ": " + defaultStyles.getPropertyValue(defaultStyles[j]) + ";";
if(computedStyles.startsWith(defaultProperty)) {
computedStyles = computedStyles.substring(defaultProperty.length);
} else {
computedStyles = computedStyles.replace(" " + defaultProperty, "");
}
}
child.remove();
children[i].setAttribute("style", computedStyles);
}
}
updateStyle(document.getElementsByTagName("body")[0]);
console.log("DONE");
To go through all the CSS styles of an element, use the following code snippet:
let targetElement = document.getElementById('specificId');
let targetElementStyle = targetElement.style;
for(let prop in targetElementStyle){
// Check if property is not a numerical index.
if(!/^\d+/.test(prop)){
console.log("Style %s = %s", prop, targetElementStyle[prop]);
/*
* Additional actions can be implemented here...
*/
}
}Is there a method to retrieve all the CSS styles defined for a specific DOM element?
Yes, one way is to iterate over all the CSS style names.
Are there any more efficient approaches?
While elegance is subjective, utilizing a library like jQuery could provide a shorter and simpler solution. Here's an example provided by someone in response to another question:
How Can I Get List Of All Element CSS Attributes with jQuery?
How does Firebug accomplish this task?
I'm not sure about that.
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