jq sets css style

jq is a very powerful Javascript library. It provides us with many convenient methods to operate elements on web pages, including methods of setting CSS styles. If you are using jq to develop your web pages, then this article will introduce you how to use jq to set CSS styles.

1. Set a single style

To set a single CSS style in jq, you can use the .css() method. For example, if you want to set the background color of an element to red, you can write the code like this:

$(".my-element").css("background-color", "red");

In the above code, we first select the element with class "my-element", and then use .css( ) method to set its background color to red. Among them, the first parameter represents the CSS property to be set, and the second parameter represents the value to be set.

2. Set multiple styles

If you need to set multiple CSS styles, you can use another form of the .css() method: pass an object as a parameter. For example, if you want to set the background color and font color of an element, you can write the code like this:

$(".my-element").css({
  "background-color": "red",
  "color": "white"
});

In the above code, we passed an object containing multiple properties and values ​​as the .css() method parameters. In this way, multiple CSS styles can be set at once.

3. Add style classes

Another common way to style CSS is to add style classes. In jq, you can use the .addClass() method to add one or more style classes. For example, if you want to add a style class with the class "highlight" to an element, you can write the code like this:

$(".my-element").addClass("highlight");

In the above code, we use the .addClass() method to add a style class to the element. If you need to add multiple style classes, you can pass a string containing multiple class names in the parameters, or pass multiple parameters. For example:

$(".my-element").addClass("highlight active");

or

$(".my-element").addClass("highlight", "active");

4. Remove style class

If you need to remove the added style class, you can use .removeClass() method. For example, if you want to remove the style class of an element with the class "highlight", you can write the code like this:

$(".my-element").removeClass("highlight");

In the above code, we use the .removeClass() method to remove a style class.

5. Switch style class

Sometimes, you need to dynamically switch the style class of an element based on certain conditions. In jq, you can use the .toggleClass() method to achieve this function. For example, if you need to dynamically switch the style class with class "active" when an element is clicked, you can write the code like this:

$(".my-element").click(function() {
  $(this).toggleClass("active");
});

In the above code, we use the .click() method to Bind a click event, and then use the .toggleClass() method to switch the style class of the element with class "active".

Summary

This article introduces several common methods of setting CSS styles in jq: use the .css() method to set a single style; use the .css() method to pass an object to set multiple Style; use the .addClass() method to add one or more style classes; use the .removeClass() method to remove an already added style class; use the .toggleClass() method to dynamically switch style classes. Using these methods can help you operate web page elements more conveniently and achieve better results.

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