How to determine whether the radio is selected in jquery-JS Tutorial-php.cn

How to determine whether the radio is selected in jquery

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Release： 2023-01-04 09:37:03

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Jquery method to determine whether the radio is selected: 1. Use the selected value to determine the selection; 2. Use the checked attribute to determine the selection; 3. jquery gets the value of the radio button; 4. Set the radio button to be selected.

How to determine whether the radio is selected in jquery

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, thinkpad t480 computer.

Recommended: jquery video tutorial

Jquery method to determine whether the radio is selected:

1. Use acquisition Selected value judgment

Directly upload the code, don’t forget to quote the JQuery package

The code is as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JQuery radio</title>
<script type="text/javascript" language="javascript" src="JavaScript/jquery-1.6.1.min.js" ></script>
<script type="text/javascript" language="javascript">
 /*------判断radio是否有选中，获取选中的值--------*/
    $(function(){
         $("#btnSubmit").click(function(){
            var val=$(&#39;input:radio[name="sex"]:checked&#39;).val();
            if(val==null){
                alert("什么也没选中!");
                return false;
            }
            else{
                alert(val);
            }
            var list= $(&#39;input:radio[name="list"]:checked&#39;).val();
            if(list==null){
                alert("请选中一个!");
                return false;
            }
            else{
                alert(list);
            }           
         });
     });
</script>
</head>
 
<body>
<form id="form1" >
<input type="radio"  name="sex" value="男" />男
<input type="radio" name="sex" value="女" />女
<br />
<input type="radio"  name="list" value="十分满意" />十分满意
<input type="radio" name="list" value="满意" />满意
<input type="radio" name="list" value="不满意" />不满意
<input type="radio" name="list" value="非常差" />非常差
<br />
<input type="submit" value="submit"  id="btnSubmit" />
</form>
</body>
</html>

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radio cannot be judged by "checked" equality, only use Use true to judge

The code is as follows:

<script type="text/javascript">
        $(function () {
            $("input").click(function () {
                if ($(this).attr("checked")) {
                    alert("选中了");
                }
            });
        });
    </script>
</head>
<body>
<input type="radio"/>
</body>
</html>

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2. Use the checked attribute to judge the selection

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

The code is as follows:

<script type="text/javascript">
        $(function () {
            $("input").click(function () {
                if ($(this).attr("checked")) {
                    alert("选中了");
                }
            });
        });
    </script>
</head>
<body>
<input type="radio"/>
</body>
</html>

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3. jquery gets the value of the radio radio button

Another: Determine whether the radio is selected and Get 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()); 
} 
}

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4. Set the radio button to be selected

The code is as follows:

$("input[type=radio]").attr("checked",&#39;2&#39;);//设置value=2的项目为当前选中项

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Related free learning recommendations: javascript(Video)

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