How to determine whether a radio button is selected in jquery

The jquery method to determine whether a radio button is selected: First, when loading the page, obtain the id through "$(this).attr("id");"; then obtain the id when the button is clicked and Just make the judgment.

The operating environment of this tutorial: windows7 system, jquery1.2.6 version, DELL G3 computer.

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Jquery method to determine whether the radio button radio is selected

The html code is as follows:

1. Get the id when loading the page

$("input[type='radio']").each(function(){ var id= $(this).attr("id"); if($("#"+id).attr("checked")=="checked"){ var fs=$("#"+id).val(); } }); var s1 = $(".aa:checked").val(); // .aa 为class var s2 = $("input[name='ra']:checked").val();

2. Get the id

$(function(){ $("input[type='radio']").click(function(){ var id= $(this).attr("id"); alert(id); }); });

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