How to determine whether a radio button is selected in jquery

Jquery method to determine whether the radio button is selected: 1. Get the id when loading the page, the code is [var id= $(this).attr("id");]; 2. Click the button When getting the id, the code is [var id= $(this).attr("id");].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, Dell G3 computer. This method is suitable for all brands of computers.

Jquery method to determine whether a radio button is selected:

The html code is as follows:

<input type="radio" id="d1" name="ra" value="a" checked="checked" />
<input type="radio" id="d2" name="ra" value="b" />
<input type="radio" id="d3" name="ra" value="c" />

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 when clicking the button

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

Related learning recommendations: javascript learning tutorial

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