How to get the style with jquery? Brief analysis of methods

In web development, sometimes we need to get the style of a certain element, such as width, height, color, etc. Today I will introduce how jQuery obtains styles.

First of all, we need to know that jQuery provides a function called css(), which can be used to get and set styles. This function has two parameters, the first parameter is the style attribute to be obtained, and the second parameter is the value of the attribute (optional).

So, how do we use the css() function? Here are a few examples.

Get the width and height of the element:

var w = $("#myElement").css("width");
var h = $("#myElement").css("height");

Get the background color of the element:

var bgColor = $("#myElement").css("background-color");

Get the border color of the element:

var borderColor = $("#myElement").css("border-color");

Get the font of the element Size:

var fontSize = $("#myElement").css("font-size");

Get the transparency of the element:

var opacity = $("#myElement").css("opacity");

In addition to the above commonly used style attributes, the css() function can also get other style attributes, such as padding, margin, border, etc. If you want to set the style, the second parameter of the css() function comes in handy. For example, to set the background color of an element to red, you can write like this:

$("#myElement").css("background-color", "red");

Sometimes, we need to get the calculated style of an element, that is, the actual style of the element in the browser, rather than the one defined in the style sheet style. At this time, we can use another function getComputedStyle(). The function is used as follows:

var elem = document.getElementById("myElement");
var style = window.getComputedStyle(elem);
var width = style.getPropertyValue("width");

getComputedStyle()The function returns an object. Contains all calculated style properties and values. We can use the getPropertyValue() function to get the value of a certain style attribute.

Compared with the css() function, the getComputedStyle() function is more powerful and can obtain more style attributes, but it is also more troublesome to use. We can choose which function to use based on actual needs.

In actual development, it is a very common requirement to obtain the style attributes of elements. After mastering the css() function provided by jQuery and the getComputedStyle() function provided by DOM, we can easily obtain and set the style of elements.

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