What is the best way to retrieve a style property from a <style> tag using JavaScript?

Question

What is the best way to retrieve a style property from a <style> tag using JavaScript?

Is there a way to retrieve CSS properties set in the <style> tag in JavaScript, rather than just those set in the element's style attribute? For example:

<style>
    div{background:red;}
</style>

How can I access these styles, such as the background property value, using JavaScript?

javascript html css

Answer 1

Answer №1

If you want to access the CSS styles of a webpage, you can utilize the document.styleSheets property, which will provide you with a list of CSSStyleSheet objects.

From these CSSStyleSheet objects, you can extract all the CSS rules that are present in each style tag.

For instance, if we consider your sample style, you would retrieve:

var styleSheetList = document.styleSheets;
var first_rule = styleSheetList[0].cssRules[0];
console.log( first_rule.selectorText);  // This should display "div"
console.log( first_rule.style.background);  // This should show "red"

Keep in mind:

You have the capability to modify these objects during runtime to alter the appearance of your webpage
The rules obtained are limited to inline styles and do not include those from external sources
All CSS properties are represented in CamelCase format; for example, background-color becomes backgroundColor

Answer 2

If you want to access the CSS styles of a webpage, you can utilize the document.styleSheets property, which will provide you with a list of CSSStyleSheet objects.

From these CSSStyleSheet objects, you can extract all the CSS rules that are present in each style tag.

For instance, if we consider your sample style, you would retrieve:

var styleSheetList = document.styleSheets;
var first_rule = styleSheetList[0].cssRules[0];
console.log( first_rule.selectorText);  // This should display "div"
console.log( first_rule.style.background);  // This should show "red"

Keep in mind:

You have the capability to modify these objects during runtime to alter the appearance of your webpage
The rules obtained are limited to inline styles and do not include those from external sources
All CSS properties are represented in CamelCase format; for example, background-color becomes backgroundColor

Answer 3

Answer №2

This snippet of code scans through the style sheet rules, changing any instances of white text to red.

let ssObj;
if (document.styleSheets[0].cssRules) {
  ssObj = document.styleSheets[0].cssRules;
}
if (document.styleSheets[0].rules) {
  ssObj = document.styleSheets[0].rules;
}
for (let i = 0; i < ssObj.length; i++) {
  if (ssObj[i].style.color === 'white') {
    ssObj[i].style.setProperty('color', 'red', null);
  }
}

It's worth noting that there are different methods for accessing style rules across various browsers, but once you've obtained them, the rest is relatively straightforward.

Answer 4

This snippet of code scans through the style sheet rules, changing any instances of white text to red.

let ssObj;
if (document.styleSheets[0].cssRules) {
  ssObj = document.styleSheets[0].cssRules;
}
if (document.styleSheets[0].rules) {
  ssObj = document.styleSheets[0].rules;
}
for (let i = 0; i < ssObj.length; i++) {
  if (ssObj[i].style.color === 'white') {
    ssObj[i].style.setProperty('color', 'red', null);
  }
}

It's worth noting that there are different methods for accessing style rules across various browsers, but once you've obtained them, the rest is relatively straightforward.

Answer 5

Answer №3

A similar example:

Styling with CSS:

<style>
  #myCustomID { color:blue; }
</style>

Javascript code snippet:

document.getElementById("myCustomID");

Answer 6

A similar example:

Styling with CSS:

<style>
  #myCustomID { color:blue; }
</style>

Javascript code snippet:

document.getElementById("myCustomID");

What is the best way to retrieve a style property from a <style> tag using JavaScript?

Answer №1

Answer №2

Answer №3

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