Methods for removing a CSS element that specifically targets a table using JavaScript

I am facing an issue with my Drupal site where the CSS for a Google Org Chart is being overridden by some existing styles. Below is the code snippet in question.

The CSS I need to eliminate:

.MainBlock table td {
   border-right: 1px solid #045273;
   border-bottom: 1px solid #045273;
   vertical-align: top;
}

I have attempted multiple solutions but none have been successful. The unsuccessful attempts are listed below.

<script type="text/javascript">
  if (document.URL.indexOf("/node/7794/draft") >= 0) {
  //$('.MainBlock').find("table tr").css("border-bottom","");
  //$(".MainBlock table td").css("border-bottom":"12px Solid #000");
  $(".MainBlock table td").css({ 'border-bottom' : ''});
}

I require a solution that will exclude this line of CSS as it is necessary on other pages. Setting it to zero or none causes issues with functionality.

javascriptjqueryhtmlcss

Answer №1

You have the option to remove the border by using either 0 or none, as an empty string will not do the trick.

$( '.MainBlock table td' ).css( { 'border-bottom' : 0 } );
.MainBlock table td {
   border-right: 1px solid #045273;
   border-bottom: 1px solid #045273;
   vertical-align: top;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<div class="MainBlock">
  <table>
    <tr>
      <td>Content</td>
      <td>Content</td>
    </tr>
  </table>
</div>

If possible, it's best to rely on CSS for this task. Make sure to use the same selector after the original one to override it. 

/* original rule */
.MainBlock table td {
   border-right: 1px solid #045273;
   border-bottom: 1px solid #045273;
   vertical-align: top;
}

/* sometime later, maybe in a different file */
.MainBlock table td {
  border-bottom: 0;
}

Another approach is to increase the specificity of the selectors. Since it's a Drupal site, you can target a specific page ID like:

.page-node-2793683 .MainBlock table td {
  border-bottom: 0;
}

EDIT

After clarification and input from @EF it:

To prevent styles from being applied to a specific page, consider using the :not() pseudo-selector.

div:not(.page-node-2793683) .MainBlock table td {
   border-right: 1px solid #045273;
   border-bottom: 1px solid #045273;
   vertical-align: top;
}
<div class="page-node-2793683">

  <div class="MainBlock">
    <table>
      <tr>
        <td>Content</td>
        <td>Content</td>
      </tr>
    </table>
  </div>
  
</div>

<div class="page-node-10">

  <div class="MainBlock">
    <table>
      <tr>
        <td>Content</td>
        <td>Content</td>
      </tr>
    </table>
  </div>
  
</div>

Note: While not mandatory, using not() without a preceding selector may not work reliably. The example above might need adjustments to fit your requirements.

Answer №2

CSS offers a unique advantage with its "cascade" feature, denoted by the 'c' in CSS. This means that you can change the appearance of elements without relying on Javascript. By creating a new rule that is more specific than the existing one, you can simply override it with just the properties you want to modify. For example:

border-bottom: 0;

To understand how to make your rules specific enough to take precedence over others, check out Specificity.

Answer №3

According to the jquery documentation found at http://api.jquery.com/css/#css-propertyName-value:

$( "#myDiv" ).css( "color", "" ) — will remove the property from an element if it was directly applied

This method may not work if the property was not assigned directly but through a css rule.

The value 12px Solid is invalid because it is missing the color component.

It is recommended to address this issue using CSS directly rather than JavaScript.

.node-7794 .MainBlock table td {
  border-bottom: 0 none;
}

If the rule does not work as expected, refer to your browser's developer console for troubleshooting

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