How jquery determines radio buttons

With the continuous development of front-end development, jQuery, as a lightweight JavaScript library, has been widely used. In some web applications, it is necessary to perform some operations on radio buttons, such as obtaining the value of the radio button. So, how does jQuery determine radio buttons? This article will introduce it in detail.

1. HTML Radio Buttons

Before introducing how to judge radio buttons, we need to know what HTML radio buttons are. A radio button is a control used to select one option from multiple options. In HTML, we can use the input element to create radio buttons, as shown below:

<input type="radio" name="sex" value="male">男
<input type="radio" name="sex" value="female">女

The above code will create two radio buttons, group them by the name attribute, and the value attribute stores each The value of the radio button. Each radio button has a type attribute set to radio, indicating that it is a radio button.

2. Determine the radio button

1. Use the prop() method

In jQuery, we can use the prop() method to get or set the attributes of the DOM element value. For radio buttons, we can check its checked attribute to determine whether the radio button is selected. The code is as follows:

if ($("input[name='sex']:checked").prop("checked")) {
    // 代码块
}

The above code first queries all radio buttons whose name is sex, then uses the :checkbox selector to select the selected radio button, and finally uses the prop() method to obtain the value of the checked attribute. . If the checked attribute is true, the code block in the if statement is executed.

2. Use the is() method

In addition to using the prop() method, we can also use the is() method to determine the radio button. The code is as follows:

if ($("input[name='sex']").is(":checked")) {
    // 代码块
}

The above code queries all radio buttons whose name is sex, then uses the :checked selector to select the selected radio button, and finally uses the is() method to determine whether it is selected. If selected, the code block in the if statement is executed.

3. Summary

In jQuery, we can use the prop() method and is() method to determine whether the radio button is selected. Both methods can achieve the same result, and developers can choose according to the actual situation. Although the method of judging radio buttons is simple, it is widely used in actual development. I hope this article can be helpful to readers and enhance their development capabilities.

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