Unable to apply color changes with jQuery

As I delve into learning jQuery, I encountered an issue while attempting to change the color of a tr element. Strangely, I was successful in updating other CSS attributes like font-style. According to my understanding so far, we use the following syntax to set CSS properties and values:

$(selector).css(property,value)

Can you help me pinpoint where I may have gone wrong? Here's a snippet of my code:

HTML:

<table class="csr">
<tr><td>Row 1</td></tr>
<tr><td>Row 2</td></tr>
<tr><td>Row 3</td></tr>
</table>

<table class="aTable">
<tr><td>Row 11</td></tr>
<tr><td>Row 22</td></tr>
<tr><td>Row 33</td></tr>
</table>

CSS:

td {
    color: blue;
    font-weight: bold;
  }

table.aTable td{
    color: red;
    font-weight: bold;
  }

jQuery:

$( "tr:first" ).css( "font-style", "italic" );
$( "tr:first" ).css( "color", "red" );
$( "tr:first" ).css( "background-color","yellow" );

$( ".aTable tr:first" ).css( "font-style", "italic" );
$( ".aTable tr:first" ).css( "background-color","yellow" );

Answer №1

The application of css attributes to the TR element is eventually overridden by the TD element, which is a subelement that appears on top of the TR.

It is possible to combine your css rules like this:

$('tr:first td').css({
           'font-style':'italic',
           'color':'red',
           'background-color':'yellow'}
);

$('.aTable tr:first td').css({
           'font-style':'italic',
           'background-color':'yellow'}
);

Technically, the first selector also captures the first row of the second table.

Answer №2

The reason for this is due to the CSS priority where the color is being applied to the tr element, making the td { color:blue } declaration stronger and therefore taking precedence. One solution is to apply the style directly to the td within the tr element:

$( "tr:first td" ).css( "color", "green" );

Check out the updated jsfiddle here.

Answer №3

To achieve the desired result, you must configure it as follows:

$( "tr:first>td" ).css( "color", "red" );

Check out the demo here!

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