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.
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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
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