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How does jquery determine whether the radio is selected?

藏色散人Original: 2020-12-18 09:35:163828browse

The jquery method to determine whether the radio is selected: first open the corresponding code file; then use the "$('input:radio:checked').val();" method to obtain the value in the radio; finally pass the judgment Whether the radio is empty can be used to determine whether the radio is selected.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version. This method is suitable for all brands of computers.

Recommended: "jquery video tutorial"

JQuery determines whether the radio is selected and gets the selected value:

<!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>

above The code uses the $('input:radio:checked').val(); method to obtain the value in the radio, and then determines whether the radio is selected by judging whether the radio is empty.

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