Changing width property of a before css selector using JQuery

Question

I have a page that has an image in it and I styled it using  before CSS selectors  The image is dynamic so it hasn t a fixed width  So I need to set  before rule s width dynamically  I want do it in client side using JQuery  Assume this      column before      width  300px      float  left      content          height  430px      column      width  500px      float  right      padding  5px      overflow  hidden      text-align  justify      How Can I only change the width property of class with  before selector  and not one without it  using JQuery

User · Answer

The answer should be Jain  You can not select an element via pseudo-selector  but you can add a new rule to your stylesheet with insertRule   I made something that should work for you   var addRule   function sheet  selector  styles        if  sheet insertRule  return sheet insertRule selector          styles        sheet cssRules length       if  sheet addRule  return sheet addRule selector  styles       addRule document styleSheets 0    body before    content   foo       http   fiddle jshell net MDyxg 1   To be super-cool  and to answer the question really  I rolled it out again and wrapped this in a jQuery-plugin  however  jquery is still not required            jquery addrule js 0 0 1 - https   gist github com yckart 5563717     Add css-rules to an existing stylesheet         see http   stackoverflow com a 16507264 1250044       Copyright  c  2013 Yannick Albert  http   yckart com     Licensed under the MIT license  http   www opensource org licenses mit-license php      2013 05 12        function            window addRule   function  selector  styles  sheet             styles    function  styles                if  typeof styles      string   return styles              var clone                   for  var p in styles                    if  styles hasOwnProperty p                         var val   styles p                       p   p replace    A-Z   g   - 1   toLowerCase       convert to dash-case                     clone    p          p      content          val         val                                                      return clone            styles            sheet   sheet    document styleSheets document styleSheets length - 1            if  sheet insertRule  sheet insertRule selector          styles        sheet cssRules length           else if  sheet addRule  sheet addRule selector  styles            return this               if       fn addRule   function  styles  sheet            addRule this selector  styles  sheet           return this            window jQuery      The usage is quite simple      body after   addRule       content   foo       color   red       fontSize   32px          or without jquery addRule  body after         content   foo       color   red       fontSize   32px        https   gist github com yckart 5563717

User · Answer

You may try to inherit property from the base class    x000D   x000D  var width   2  x000D  var interval   setInterval function      x000D      var element   document getElementById  box    x000D      width    0 0625  x000D      element style width   width    em   x000D      if  width  gt   7  clearInterval interval   x000D     50   x000D   box   x000D         Set property    x000D      width 4em  x000D      height 2em  x000D      background-color  d42  x000D      position relative  x000D    x000D   box after   x000D         Inherit property    x000D      width inherit  x000D      content     x000D      height 1em  x000D      background-color  2b4  x000D      position absolute  x000D      top 100   x000D    x000D   lt div id  box  class  box  gt  lt  div gt  x000D   x000D   x000D

User · Answer

Pseudo-elements are not part of the DOM  so they can t be manipulated using jQuery or Javascript   But as pointed out in the accepted answer  you can use the JS to append a style block which ends of styling the pseudo-elements

User · Answer

As Boltclock states in his answer to Selecting and manipulating CSS pseudo-elements such as   before and   after using jQuery     Although they are rendered by browsers through CSS as if they were like other real DOM elements  pseudo-elements themselves are not part of the DOM  and thus you can t select and manipulate them with jQuery    Might just be best to set the style with jQuery instead of using the pseudo CSS selector

User · Answer

One option is to use an attribute on the image  and modify that using jQuery  Then take that value in CSS   HTML  note I m  assuming  cloumn is a div but it could be anything     lt div class  column  bf-width 100  gt       lt img src         gt   lt  div gt    jQuery      General use      column   attr  bf-width   100      With your image  along the lines of      column   attr  bf-width      img   width       And then in order to use that value in CSS    column before       content  attr data-content   px                     This will grab the attribute value from  column  and apply it on the before   Sources  CSS attr  note the examples with before   jQuery attr

User · Answer

I don t think there s a jQuery-way to directly access the pseudoclass  rules  but you could always append a new style element to the document s head like      head   append   lt style gt  column before width 800px  important   lt  style gt       See a live demo here  I also remember having seen a plugin that tackles this issue once but I couldn t find it on first googling unfortunately

User · Answer

Pseudo elements are part of the shadow DOM and can not be modified  but can have their values queried   However  sometimes you can get around that by using classes  for example  jQuery     element   addClass  some-class     CSS  some-class before          change your properties here       This may not be suitable for your query  but it does demonstrate you can achieve this pattern sometimes  To get a pseudo element s value  try some code like    var pseudoElementContent   window getComputedStyle     element   0     before      getPropertyValue  content

[javascript] Changing width property of a :before css selector using JQuery

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