How do you add CSS with Javascript

Question

How do you add CSS rules  eg strong   color  red    by use of Javascript

User · Answer

Here s a sample template to help you get started  Requires 0 libraries and uses only javascript to inject both HTML and CSS   The function was borrowed from the user  Husky above  Useful if you want to run a tampermonkey script and wanted to add a toggle overlay on a website  e g  a note app for instance    x000D   x000D     INJECTING THE HTML x000D  document querySelector  body   innerHTML      lt div id  injection  gt Hello World lt  div gt    x000D   x000D     CSS INJECTION FUNCTION x000D    https   stackoverflow com questions 707565 how-do-you-add-css-with-javascript x000D  function insertCss  code     x000D      var style   document createElement  style    x000D      style type    text css   x000D      if  style styleSheet    x000D             IE x000D          style styleSheet cssText   code  x000D        else   x000D             Other browsers x000D          style innerHTML   code  x000D        x000D      document getElementsByTagName  head   0  appendChild  style    x000D    x000D   x000D     INJECT THE CSS INTO FUNCTION x000D     Write the css as you normally would    but treat it as strings and concatenate for multilines x000D  insertCss  x000D      injection  color  red  font-size  30px      x000D     body  background-color  lightblue    x000D    x000D   x000D   x000D

User · Answer

if you know at least one  lt style gt  tag exist in page   use this function    CSS function i  document getElementsByTagName  style   0  innerHTML  i     usage    CSS  div background  00F

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Shortest One Liner  x000D   x000D     One liner function  const addCSS   s   gt  document head appendChild document createElement  style    innerHTML s      Usage   addCSS  body  background red      x000D   x000D   x000D

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Here s a slightly updated version of Chris Herring s solution  taking into account that you can use innerHTML as well instead of a creating a new text node   function insertCss  code         var style   document createElement  style        style type    text css        if  style styleSheet               IE         style styleSheet cssText   code        else              Other browsers         style innerHTML   code             document getElementsByTagName  head   0  appendChild  style

User · Answer

This is my solution to add a css rule at the end of the last style sheet list   var css   new function         function addStyleSheet                 let head   document head          let style   document createElement  style             head appendChild style              this insert   function rule                if document styleSheets length    0    addStyleSheet               let sheet   document styleSheets document styleSheets length - 1           let rules   sheet rules           sheet insertRule rule  rules length            css insert  body   background-color  red

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You can also do this using DOM Level 2 CSS interfaces  MDN    var sheet   window document styleSheets 0   sheet insertRule  strong   color  red      sheet cssRules length        on all but  naturally  IE8 and prior  which uses its own marginally-different wording   sheet addRule  strong    color  red    -1     There is a theoretical advantage in this compared to the createElement-set-innerHTML method  in that you don t have to worry about putting special HTML characters in the innerHTML  but in practice style elements are CDATA in legacy HTML  and     lt     and     amp     are rarely used in stylesheets anyway   You do need a stylesheet in place before you can started appending to it like this  That can be any existing active stylesheet  external  embedded or empty  it doesn t matter  If there isn t one  the only standard way to create it at the moment is with createElement

User · Answer

The simple-and-direct approach is to create and add a new style node to the document      Your CSS as text var styles          qwebirc-qui  ircwindow div            font-family  Georgia Cambria  Times New Roman  Times serif          margin  26px auto 0 auto          max-width  650px             qwebirc-qui  lines           font-size  18px          line-height  1 58          letter-spacing  - 004em              qwebirc-qui  nicklist a           margin  6px           var styleSheet   document createElement  style   styleSheet type    text css  styleSheet innerText   styles document head appendChild styleSheet

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YUI just recently added a utility specifically for this  See stylesheet js here

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You can add classes or style attributes on an element by element basis    For example    lt a name  myelement  onclick  this style color   FF0    gt text lt  a gt    Where you could do this style background  this style font-size  etc  You can also apply a style using this same method ala   this className  classname     If you want to do this in a javascript function  you can use getElementByID rather than  this

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This easy example of add  lt style gt  in head of html  var sheet   document createElement  style    sheet innerHTML    table th padding-bottom  0  important padding-top  0  important   n     table ul      margin-top  0  important     margin-bottom  0  important   n     table td padding-bottom  0  important padding-top  0  important   n      messages error display none  important   n      messages status display none  important       document body appendChild sheet      append in body document head appendChild sheet      append in head   Source Dynamic style - manipulating CSS with JavaScript

User · Answer

Here s my general-purpose function which parametrizes the CSS selector and rules  and optionally takes in a css filename  case-sensitive  if you wish to add to a particular sheet instead  otherwise  if you don t provide a CSS filename  it will create a new style element and append it to the existing head  It will make at most one new style element and re-use it on future function calls   Works with FF  Chrome  and IE9   maybe earlier too  untested     function addCssRules selector  rules    Optional   sheetName           We want the last sheet so that rules are not overridden      var styleSheet   document styleSheets document styleSheets length - 1       if  sheetName            for  var i in document styleSheets                if  document styleSheets i  href  amp  amp  document styleSheets i  href indexOf sheetName   gt  -1                    styleSheet   document styleSheets i                   break                                    if  typeof styleSheet      undefined     styleSheet     null            var styleElement   document createElement  style            styleElement type    text css           document head appendChild styleElement           styleSheet   styleElement sheet             if  styleSheet            if  styleSheet insertRule              styleSheet insertRule selector          rules        styleSheet cssRules length           else if  styleSheet addRule              styleSheet addRule selector  rules

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Another option is to use JQuery to store the element s in-line style property  append to it  and to then update the element s style property with the new values  As follows   function appendCSSToElement element  CssProperties                        var existingCSS     element  attr  style                  if existingCSS    undefined  existingCSS                      each CssProperties  function key value                                existingCSS          key          value                                       element  attr  style   existingCSS                return   element               And then execute it with the new CSS attributes as an object   appendCSSToElement   ElementID      color    white    background-color    green    font-weight    bold        This may not necessarily be the most efficient method  I m open to suggestions on how to improve this        but it definitely works

User · Answer

use  css in Jquery like    strong   css  background   red      x000D   x000D     strong   css  background   red    x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   lt strong gt  Example x000D   lt  strong gt   x000D   x000D   x000D

User · Answer

The solution by Ben Blank wouldn t work in IE8 for me   However this did work in IE8  function addCss cssCode    var styleElement   document createElement  style      styleElement type    text css     if  styleElement styleSheet        styleElement styleSheet cssText   cssCode      else       styleElement appendChild document createTextNode cssCode          document getElementsByTagName  head   0  appendChild styleElement

[javascript] How do you add CSS with Javascript?

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