Overriding important style

Question

Title pretty much sums it up   The external style sheet has the following code   td EvenRow a     display  none  important      I have tried using   element style display    inline     and  element style display    inline  important     but neither works  Is it possible to override an  important style using javascript   This is for a greasemonkey extension  if that makes a difference

User · Answer

If all you are doing is adding css to the page, then I would suggest you use the Stylish addon, and write a user style instead of a user script, because a user style is more efficient and appropriate.

See this page with information on how to create a user style

User · Answer

https   developer mozilla org en-US docs Web CSS initial  use initial property in css3     lt p style  color red important  gt       this text is red          lt em style  color initial  gt             this text is in the initial color  e g  black          lt  em gt      this is red again   lt  p gt

User · Answer

Rather than injecting style  if you inject a class for eg   show   through java script  it will work  But here you need css like below  the added class css rule should be below your original rule   td EvenRow a    display  none  important     td EvenRow a show    display  block  important

User · Answer

If you want to update   add single style in DOM Element style attribute you can use this function   function setCssTextStyle el  style  value      var result   el style cssText match new RegExp         s               style replace  -      -        s                      idx    if  result        idx   result index   result 0  indexOf result 1        el style cssText   el style cssText substring 0  idx          style          value               el style cssText substring idx   result 1  length       else       el style cssText          style          value                style cssText is supported for all major browsers   Use case example   var elem   document getElementById  elementId    setCssTextStyle elem   margin-top    10px  important      Here is link to demo

User · Answer

There we have another possibility to remove a property value from the CSS   Like using the replace method in js  But you have to know exactly the ID of the style  or you can write a for loop to detecting that by  count styles on the page  then check if any of those  includes  or  match  an  important value   amp  you can count also - how much contains them  or just simply write a global  regexp   str gi  replacing method   Mine is very simple  but I attach a jsBin  for example   https   jsbin com geqodeg edit html css js output  First I set the body background in CSS for yellow  important  then I overrided by JS for darkPink

User · Answer

https   jsfiddle net xk6Ut 256   One option to override CSS class in JavaScript is using an ID for the style element so that we can update the CSS class  function writeStyles styleName  cssText        var styleElement   document getElementById styleName       if  styleElement  document getElementsByTagName  head   0  removeChild          styleElement       styleElement   document createElement  style        styleElement type    text css       styleElement id   styleName      styleElement innerHTML   cssText      document getElementsByTagName  head   0  appendChild styleElement              var cssText     testDIV  height     height    px  important          writeStyles  styles js   cssText

User · Answer

element style has a setProperty method that can take the priority as a third parameter   element style setProperty  display    inline    important     It didn t work in old IEs but it should be fine in current browsers

User · Answer

element style has a setProperty method that can take the priority as a third parameter   element style setProperty  display    inline    important     It didn t work in old IEs but it should be fine in current browsers

User · Answer

If you want to update   add single style in DOM Element style attribute you can use this function   function setCssTextStyle el  style  value      var result   el style cssText match new RegExp         s               style replace  -      -        s                      idx    if  result        idx   result index   result 0  indexOf result 1        el style cssText   el style cssText substring 0  idx          style          value               el style cssText substring idx   result 1  length       else       el style cssText          style          value                style cssText is supported for all major browsers   Use case example   var elem   document getElementById  elementId    setCssTextStyle elem   margin-top    10px  important      Here is link to demo

User · Answer

I believe the only way to do this it to add the style as a new CSS declaration with the   important  suffix  The easiest way to do this is to append a new  lt style gt  element to the head of document   function addNewStyle newStyle        var styleElement   document getElementById  styles js        if   styleElement            styleElement   document createElement  style            styleElement type    text css           styleElement id    styles js           document getElementsByTagName  head   0  appendChild styleElement             styleElement appendChild document createTextNode newStyle       addNewStyle  td EvenRow a  display inline  important       The rules added with the above method will  if you use the  important suffix  override other previously set styling  If you re not using the suffix then make sure to take concepts like  specificity  into account

User · Answer

element style has a setProperty method that can take the priority as a third parameter   element style setProperty  display    inline    important     It didn t work in old IEs but it should be fine in current browsers

User · Answer

There we have another possibility to remove a property value from the CSS   Like using the replace method in js  But you have to know exactly the ID of the style  or you can write a for loop to detecting that by  count styles on the page  then check if any of those  includes  or  match  an  important value   amp  you can count also - how much contains them  or just simply write a global  regexp   str gi  replacing method   Mine is very simple  but I attach a jsBin  for example   https   jsbin com geqodeg edit html css js output  First I set the body background in CSS for yellow  important  then I overrided by JS for darkPink

User · Answer

Building on  Premasagar s excellent answer  if you don t want to remove all the other inline styles use this    accepts the hyphenated versions  i e  not  cssFloat   addStyle element  property  value  important          remove previously defined property     if  element style setProperty          element style setProperty property           else         element style setAttribute property              insert the new style with all the old rules     element setAttribute  style   element style cssText           property         value     important       important                     Can t use removeProperty   because it wont remove  important rules in Chrome  Can t use element style property       because it only accepts camelCase in FireFox

User · Answer

There are a couple of simple one-liners you can use to do this   1  Set a   style  attribute on the element   element setAttribute  style    display inline  important      or     2  Modify the cssText property of the style object   element style cssText    display inline  important     Either will do the job        BTW - if you want a useful tool to manipulate  important rules in elements  I ve written a jQuery plugin called  important   http   github com premasagar important

User · Answer

If all you are doing is adding css to the page, then I would suggest you use the Stylish addon, and write a user style instead of a user script, because a user style is more efficient and appropriate.

See this page with information on how to create a user style

User · Answer

https   developer mozilla org en-US docs Web CSS initial  use initial property in css3     lt p style  color red important  gt       this text is red          lt em style  color initial  gt             this text is in the initial color  e g  black          lt  em gt      this is red again   lt  p gt

User · Answer

Building on  Premasagar s excellent answer  if you don t want to remove all the other inline styles use this    accepts the hyphenated versions  i e  not  cssFloat   addStyle element  property  value  important          remove previously defined property     if  element style setProperty          element style setProperty property           else         element style setAttribute property              insert the new style with all the old rules     element setAttribute  style   element style cssText           property         value     important       important                     Can t use removeProperty   because it wont remove  important rules in Chrome  Can t use element style property       because it only accepts camelCase in FireFox

User · Answer

There are a couple of simple one-liners you can use to do this   1  Set a   style  attribute on the element   element setAttribute  style    display inline  important      or     2  Modify the cssText property of the style object   element style cssText    display inline  important     Either will do the job        BTW - if you want a useful tool to manipulate  important rules in elements  I ve written a jQuery plugin called  important   http   github com premasagar important

User · Answer

element style has a setProperty method that can take the priority as a third parameter   element style setProperty  display    inline    important     It didn t work in old IEs but it should be fine in current browsers

User · Answer

I believe the only way to do this it to add the style as a new CSS declaration with the   important  suffix  The easiest way to do this is to append a new  lt style gt  element to the head of document   function addNewStyle newStyle        var styleElement   document getElementById  styles js        if   styleElement            styleElement   document createElement  style            styleElement type    text css           styleElement id    styles js           document getElementsByTagName  head   0  appendChild styleElement             styleElement appendChild document createTextNode newStyle       addNewStyle  td EvenRow a  display inline  important       The rules added with the above method will  if you use the  important suffix  override other previously set styling  If you re not using the suffix then make sure to take concepts like  specificity  into account

User · Answer

Rather than injecting style  if you inject a class for eg   show   through java script  it will work  But here you need css like below  the added class css rule should be below your original rule   td EvenRow a    display  none  important     td EvenRow a show    display  block  important

User · Answer

I believe the only way to do this it to add the style as a new CSS declaration with the   important  suffix  The easiest way to do this is to append a new  lt style gt  element to the head of document   function addNewStyle newStyle        var styleElement   document getElementById  styles js        if   styleElement            styleElement   document createElement  style            styleElement type    text css           styleElement id    styles js           document getElementsByTagName  head   0  appendChild styleElement             styleElement appendChild document createTextNode newStyle       addNewStyle  td EvenRow a  display inline  important       The rules added with the above method will  if you use the  important suffix  override other previously set styling  If you re not using the suffix then make sure to take concepts like  specificity  into account

User · Answer

Below is a snippet of code to set the important parameter for the style attribute using jquery     fn setFixedStyle   function styles       var s     this  attr  style        s       s replace    g      replace      g          s   s substring 0 s length-1           s   s replace    g          replace    g        replace    g        replace    g               var stOb   JSON parse s  st      if  styles          each stOb function k v         stOb k       important                      else         each styles function k v         if v length gt 0           stOb k    v    important          else          stOb k        important                                var ns   JSON stringify stOb         this  attr  style  ns replace        g     replace    g             Usage is pretty simple Just pass an object containing all the attributes you want to set as important       i1   setFixedStyle   width   50px   height          There are two additional options   1 To just add important parameter to already present style attribute pass empty string   2 To add important param for all attributes present dont pass anything  It will set all attributes as important   Here is it live in action  http   codepen io agaase pen nkvjr

User · Answer

Below is a snippet of code to set the important parameter for the style attribute using jquery     fn setFixedStyle   function styles       var s     this  attr  style        s       s replace    g      replace      g          s   s substring 0 s length-1           s   s replace    g          replace    g        replace    g        replace    g               var stOb   JSON parse s  st      if  styles          each stOb function k v         stOb k       important                      else         each styles function k v         if v length gt 0           stOb k    v    important          else          stOb k        important                                var ns   JSON stringify stOb         this  attr  style  ns replace        g     replace    g             Usage is pretty simple Just pass an object containing all the attributes you want to set as important       i1   setFixedStyle   width   50px   height          There are two additional options   1 To just add important parameter to already present style attribute pass empty string   2 To add important param for all attributes present dont pass anything  It will set all attributes as important   Here is it live in action  http   codepen io agaase pen nkvjr

User · Answer

I believe the only way to do this it to add the style as a new CSS declaration with the   important  suffix  The easiest way to do this is to append a new  lt style gt  element to the head of document   function addNewStyle newStyle        var styleElement   document getElementById  styles js        if   styleElement            styleElement   document createElement  style            styleElement type    text css           styleElement id    styles js           document getElementsByTagName  head   0  appendChild styleElement             styleElement appendChild document createTextNode newStyle       addNewStyle  td EvenRow a  display inline  important       The rules added with the above method will  if you use the  important suffix  override other previously set styling  If you re not using the suffix then make sure to take concepts like  specificity  into account

User · Answer

https   jsfiddle net xk6Ut 256   One option to override CSS class in JavaScript is using an ID for the style element so that we can update the CSS class  function writeStyles styleName  cssText        var styleElement   document getElementById styleName       if  styleElement  document getElementsByTagName  head   0  removeChild          styleElement       styleElement   document createElement  style        styleElement type    text css       styleElement id   styleName      styleElement innerHTML   cssText      document getElementsByTagName  head   0  appendChild styleElement              var cssText     testDIV  height     height    px  important          writeStyles  styles js   cssText

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