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How to determine whether the radio is selected in jquery
- coldplay.xixiOriginal
- 2020-12-11 15:04:175566browse
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.
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(){
$("#btnSubmit").click(function(){
var val=$('input:radio[name="sex"]:checked').val();
if(val==null){
alert("什么也没选中!");
return false;
}
else{
alert(val);
}
var list= $('input:radio[name="list"]:checked').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>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>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>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());
}
}4. Set the radio button to be 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Related free learning recommendations: javascript(Video)
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