How to get the style of td in javascript

In Web development, JavaScript is a very commonly used programming language. It can be used to add interactivity and dynamic effects, and is often used in HTML page development. When coming into contact with JavaScript, we often encounter the need to obtain the attributes or styles of an element, such as obtaining the style of a cell (td). This article will introduce how JavaScript can obtain the style of td.

1. Use the style attribute
The easiest way to get the style of td is to use the style attribute. The style attribute contains all styles of the td element and can be used to set or get individual style attributes. For example, to get the background color of the td element, you can use the following code:

var tdElement = document.getElementById('tdId'); 
var bgColor = tdElement.style.backgroundColor;

Here, the td element is obtained through the getElementById() method, and then the value of the background color backgroundColor is obtained using the style attribute.
But it should be noted that the style attribute will only contain the value of the attribute if the style attribute is explicitly defined in the inline style. If the style is defined through a CSS style sheet, it cannot be obtained through this method.

2. Use the window.getComputedStyle() method
The getComputedStyle() method is a method under the Window object, used to obtain all calculated style values ​​​​of the specified element. The second parameter of this method is a pseudo-element string. When processing HTML style sheets, pseudo-elements can be used to represent special components, such as before, after, etc. The style code for obtaining a td element is as follows:

var tdElement = document.getElementById('tdId'); 
var style = window.getComputedStyle(tdElement); 
var bgColor = style.backgroundColor;

Here the td element is obtained through the getElementById() method, then the getComputedStyle() method is used to obtain the style object, and finally the backgroundColor property of the style object is used to obtain the background color.

3. Use the attributes of the current element
If you want to get the style of the current td element, you can use the attributes of the current element. For example, to get the background color of the current element, you can use the following code:

document.documentElement.onclick = function(event) { 
    if (event.target.tagName == 'TD') { 
        var bgColor = event.target.bgColor;
    } 
};

The document.documentElement.onclick() method is used here to bind an event. When any element is clicked, if the event source is td element, get the value of the bgColor attribute.

Summary
There are many ways to obtain the td element style, each method has its own characteristics and is suitable for different scenarios. It is very simple to get a single style using the style attribute, but there is no way to get a style defined through a CSS style sheet. The getComputedStyle() method can get all calculated styles, but you need to pay attention to browser compatibility. You can easily get the style of the current element using the properties of the current element, but you can only get some specific style attributes such as background color and border color. According to your own scenarios and needs, you can better complete the development work by choosing and using the appropriate method.

The above is the detailed content of How to get the style of td in javascript. For more information, please follow other related articles on the PHP Chinese website!