How to determine whether a radio button is selected in jquery

Jquery method to determine whether a radio button is selected: 1. Use the checked attribute to determine whether it is selected. The code is [if ($(this).attr("checked")) {alert("checked"); }]; 2. jquery gets the value of the radio button.

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer.

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Jquery method to determine whether the radio button is selected:

1. Use the checked attribute to judge the selection

radio cannot be judged by "checked" equality, only true is used to judge

The code is as follows:

二, jquery gets the value of the radio radio button

The code is as follows:

$("input[name='items']:checked").val();

Another: Determine whether the radio is selected and obtain the selected value

The code is as follows :

function checkradio(){
var item = $(":radio:checked");
var len=item.length;
if(len>0){
  alert("yes--选中的值为："+$(":radio:checked").val());
}
}

3. Get the value of a group of radio selected items

The code is as follows:

var item = $('input[name=items][checked]').val();

4. Settings The radio button is selected

The code is as follows:

$("input[type=radio]").attr("checked",'2');//设置value=2的项目为当前选中项

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