更改焦点上输入元素的背景颜色

Question

I would like to change the background colour of the text input ( .item-input ) when I press a tab key or via mouse - for some reason focus is not firing?

For example:

<tr class="item">
     <td> <input class="item-input" type="text" /> </td>
     <td> <input class="option" type="text" /> </td>
</tr>

If .item-input is selected via key or mouse

if($('.item-input').is(':focus')) {
    $(this).addClass("input-focus");
}

In the css file I have:

.input-focus {
    background-color: yellow;
}

Answer 1

Use plain CSS:

 .item-input:focus { background-color: yellow; } 

 <input class="item-input" type="text" /> 

But if you want to use jQuery, listen to the focus event:

 $('.item-input').on('focus blur', function() { $(this).toggleClass("input-focus"); }); 

 .input-focus { background-color: yellow; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input class="item-input" type="text" /> 

I replaced the .addClass() method with the .toggleClass() method under the impression that you want the class removed on blur .