The methods for operating element attributes are: 1. Methods for operating class attributes, including addClass(), hasClass(), removeClass(), toggleClass(); 2. Methods for operating specified attributes, including attr() , prop(), removeAttr().
The operating environment of this tutorial: windows7 system, jquery1.12.4 version, Dell G3 computer.
jQuery property operation method
| Method | Description |
|---|---|
| addClass() | Add the specified class name (class attribute value) to the matching element. |
| attr() | Sets or returns the attributes and values of the matching element. |
| prop() | Set or return the properties and values of the matching element. |
| hasClass() | Checks whether the matching element has the specified class. |
| removeAttr() | Removes the specified attribute from all matching elements. |
| removeClass() | Remove all or specified classes from all matching elements. |
| toggleClass() | Adds or removes a class from the matching element. |
jQuery attr() and prop() methods return or set attributes
prop() method Similar to the attr() method, both are used to get or set the HTML attributes of elements, but there are essential differences between the two.
jQuery official recommendation: For attributes with two values of true and false, such as checked, selected, disabled, etc., it is recommended to use the prop() method to operate, while for other attributes it is recommended to use the attr() method. to operate.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<script src="js/jquery-1.12.4.min.js"></script>
<script>
$(function () {
$('input[type="radio"]').change(function(){
var bool = $(this).attr("checked");
if(bool){
$("p").text("你选择的是：" + $(this).val());
}
})
})
</script>
</head>
<body>
<div>
<label><input type="radio" name="fruit" value="苹果" />苹果</label>
<label><input type="radio" name="fruit" value="香蕉" />香蕉</label>
<label><input type="radio" name="fruit" value="西瓜" />西瓜</label>
</div>
<p></p>
</body>
</html>
In this example, we actually want to determine whether the radio button is checked by $(this).attr("checked") , if selected, get the value of the radio button. But after running the code, I found: It has no effect at all! Why is this?
In fact, we cannot obtain the checked, selected, and disabled attributes of the form element using the attr() method, but must use the prop() method. Therefore, it will work if we replace the attr() method with the prop() method.
In fact, the prop() method appears to make up for the shortcomings of the attr() method in form attribute operations. Remember one sentence: If a property cannot be obtained or set using the attr() method, it can be achieved by changing the prop() method.
removeAttr() method removes attributes
In jQuery, we can use the removeAttr() method to delete an attribute of an element.
Grammar:
$().removeAttr("属性名")jQuery class name operation
Class name operation refers to adding a class or Remove a class to control the style of the element as a whole.
In jQuery, there are three types of CSS class name operations.
Add class.
Delete class.
Switch class.
addClass() method to add a class
In jQuery, we can use the addClass() method to add a class to an element.
Syntax:
$().addClass("类名")removeClass() method deletes a class
In jQuery, we can use the removeClass() method to delete a class for an element .
Syntax:
$().removeClass("类名")toggleClass() method switches class
In jQuery, we can use the toggleClass() method to switch class names for elements. Toggle actually means "switch". We will be exposed to this word a lot in the future, such as toggle(), slideToggle(), etc. Friends should pay attention and compare.
Syntax:
$().toggleClass("类名")toggleClass() method is used to check whether an element has a certain class. If the class does not exist, the class is added to the element; if the class already exists, the class is removed from the element.
[Recommended learning: jQuery video tutorial, web front-end]
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