Is there a way to extract the properties of a CSS class from a stylesheet and convert them into a hash using JavaScript or jQuery?

Question

Is there a way to extract the properties of a CSS class from a stylesheet and convert them into a hash using JavaScript or jQuery?

I am exploring a way to extract key value pairs from a CSS stylesheet related to a specific class or id into a JavaScript object for data accessibility.

It is important to mention that I do not intend to apply this class directly to any DOM elements.

In my search, the only method I have discovered in JQuery involves creating a hidden dummy element and adding the class to it using:

$(“#dummy").addClass(“myclass”);

After which, I can query the properties using:

$(“#dummy”).css(property);

However, I am looking for a solution that allows me to view each css property individually without prior knowledge of what they are.

Ideally, I would like a straightforward process that loads a CSS class into a hash. Is there a native JavaScript alternative to achieve this? Any insights would be appreciated.

Thank you, -Rob

javascript jquery css stylesheet

Answer 1

Answer №1

Consider the following two options:

1) Utilize the Stylesheet object

You can access the class definition directly by referencing the resources here and here. This allows you to read the style properties and apply them to your DOM element. Simply loop through the stylesheets (document.styleSheets) and for each stylesheet, iterate through the cssRules (rules on certain browsers). You can identify the rule with a specific selector matching your class and then access its properties using for (name in rule.style), with the value being rule.style[name] inside the loop.

2) Use the getComputedStyle function:

Apply the class to an off-page element as intended, then utilize the getComputedStyle method (MDC, MSDN) to retrieve the style object for its computed style. Keep in mind that the computed style may include inherited items from parent elements such as body or even html.

Answer 2

Consider the following two options:

1) Utilize the Stylesheet object

You can access the class definition directly by referencing the resources here and here. This allows you to read the style properties and apply them to your DOM element. Simply loop through the stylesheets (document.styleSheets) and for each stylesheet, iterate through the cssRules (rules on certain browsers). You can identify the rule with a specific selector matching your class and then access its properties using for (name in rule.style), with the value being rule.style[name] inside the loop.

2) Use the getComputedStyle function:

Apply the class to an off-page element as intended, then utilize the getComputedStyle method (MDC, MSDN) to retrieve the style object for its computed style. Keep in mind that the computed style may include inherited items from parent elements such as body or even html.

Answer 3

Answer №2

After seeking assistance from T.J. Crowder, the solution to my query has been provided through the following code implementation:

Step 1: Obtain the desired stylesheet and specific rule:

var stylesheets = document.styleSheets;
var rule = document.styleSheets[0].cssRules[0];

Step 2: Access the specific rule in different ways

rule.style.cssText  // Retrieve the entire text of the CSS rule
rule.selectorText   // Get the selector for that rule e.g. .myclass

Iterate through individual styles:

var styleObj = rule.style;

for (var i = 0; i < styleObj.length; i++) {
  var key = styleObj[i];             // key represents the CSS property e.g. 'color'
  var val = styleObj[key.toCamel()]  // val indicates the CSS value e.g. 'red'
}

It is important to note the necessity of converting CSS properties to CamelCase for those with hyphens. For instance, 'font-family' must be transformed into 'fontFamily'

Due to the absence of specific functions in JavaScript and jQuery for this purpose (though Prototype does offer them), it is advisable to include these extensions to the String class within your script

String.prototype.toCamel = function(){
return this.replace(/(\-[a-z])/g, function($1){return $1.toUpperCase().replace('-','');});
};
String.prototype.toDash = function(){
return this.replace(/([A-Z])/g, function($1){return "-"+$1.toLowerCase();});
};

The resource for acquiring this information is James Roberts' blog

Answer 4

After seeking assistance from T.J. Crowder, the solution to my query has been provided through the following code implementation:

Step 1: Obtain the desired stylesheet and specific rule:

var stylesheets = document.styleSheets;
var rule = document.styleSheets[0].cssRules[0];

Step 2: Access the specific rule in different ways

rule.style.cssText  // Retrieve the entire text of the CSS rule
rule.selectorText   // Get the selector for that rule e.g. .myclass

Iterate through individual styles:

var styleObj = rule.style;

for (var i = 0; i < styleObj.length; i++) {
  var key = styleObj[i];             // key represents the CSS property e.g. 'color'
  var val = styleObj[key.toCamel()]  // val indicates the CSS value e.g. 'red'
}

It is important to note the necessity of converting CSS properties to CamelCase for those with hyphens. For instance, 'font-family' must be transformed into 'fontFamily'

Due to the absence of specific functions in JavaScript and jQuery for this purpose (though Prototype does offer them), it is advisable to include these extensions to the String class within your script

String.prototype.toCamel = function(){
return this.replace(/(\-[a-z])/g, function($1){return $1.toUpperCase().replace('-','');});
};
String.prototype.toDash = function(){
return this.replace(/([A-Z])/g, function($1){return "-"+$1.toLowerCase();});
};

The resource for acquiring this information is James Roberts' blog

Is there a way to extract the properties of a CSS class from a stylesheet and convert them into a hash using JavaScript or jQuery?

Answer №1

Answer №2

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